/* ==========================================================================
   DESIGN TOKENS & VARIABLES (MINIMALIST MONOCHROME THEME)
   ========================================================================== */
:root {
    color-scheme: dark;
    --bg-main: #09090b;
    --bg-card: #121215;
    --bg-card-hover: #18181c;
    --bg-surface: #141418;
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.22);

    --text-primary: #f4f4f5;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;

    --nav-bg: #0f0f12;
    --nav-bg-scrolled: #09090b;
    --ink: #ffffff;
    --glass: rgba(255, 255, 255, 0.03);
    --glass-mid: rgba(255, 255, 255, 0.06);
    --glass-strong: rgba(255, 255, 255, 0.08);
    --glass-hover: rgba(255, 255, 255, 0.12);
    --glass-active: rgba(255, 255, 255, 0.14);
    --glass-highlight: rgba(255, 255, 255, 0.18);
    --cta-bg: #ffffff;
    --cta-text: #09090b;
    --cta-bg-hover: #f4f4f5;
    --spotlight: rgba(255, 255, 255, 0.08);
    --rail-line: rgba(255, 255, 255, 0.12);
    --rail-dot: rgba(255, 255, 255, 0.25);
    --overlay-scrim: rgba(9, 9, 11, 0.92);
    --contact-box: rgba(18, 18, 21, 0.72);
    --input-bg: rgba(255, 255, 255, 0.02);
    --input-bg-focus: rgba(255, 255, 255, 0.04);
    --input-border-focus: rgba(255, 255, 255, 0.3);
    --highlight-border: rgba(255, 255, 255, 0.45);
    --highlight-glow: 0 0 30px rgba(255, 255, 255, 0.08);
    --project-img-bg: #08080a;
    --grain-opacity: 0.038;
    --card-highlight-bg: #18181e;

    --font-serif: 'Playfair Display', Georgia, serif;
    --font-khmer: 'Noto Serif Khmer', 'Playfair Display', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    --transition-fast: 0.2s ease;
    --radius-card: 14px;
    --radius-pill: 9999px;
}

html[data-theme="light"] {
    color-scheme: light;
    --bg-main: #f3f1eb;
    --bg-card: #fffcf7;
    --bg-card-hover: #f7f4ee;
    --bg-surface: #ebe8e1;
    --border-subtle: rgba(24, 24, 27, 0.09);
    --border-hover: rgba(24, 24, 27, 0.2);

    --text-primary: #18181b;
    --text-secondary: #52525b;
    --text-muted: #71717a;

    --nav-bg: rgba(255, 252, 247, 0.78);
    --nav-bg-scrolled: rgba(243, 241, 235, 0.92);
    --ink: #18181b;
    --glass: rgba(24, 24, 27, 0.035);
    --glass-mid: rgba(24, 24, 27, 0.05);
    --glass-strong: rgba(24, 24, 27, 0.07);
    --glass-hover: rgba(24, 24, 27, 0.1);
    --glass-active: rgba(24, 24, 27, 0.12);
    --glass-highlight: rgba(24, 24, 27, 0.14);
    --cta-bg: #18181b;
    --cta-text: #fafafa;
    --cta-bg-hover: #27272a;
    --spotlight: rgba(24, 24, 27, 0.07);
    --rail-line: rgba(24, 24, 27, 0.14);
    --rail-dot: rgba(24, 24, 27, 0.28);
    --overlay-scrim: rgba(243, 241, 235, 0.94);
    --contact-box: rgba(255, 252, 247, 0.88);
    --input-bg: rgba(24, 24, 27, 0.03);
    --input-bg-focus: rgba(24, 24, 27, 0.05);
    --input-border-focus: rgba(24, 24, 27, 0.28);
    --highlight-border: rgba(24, 24, 27, 0.42);
    --highlight-glow: 0 0 28px rgba(24, 24, 27, 0.08);
    --project-img-bg: #e7e4dc;
    --grain-opacity: 0.03;
    --card-highlight-bg: #fff;
}

/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-sans);
    overflow-x: clip;
    scroll-behavior: smooth;
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE/Edge */
}

html::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    min-height: 100vh;
    width: 100%;
    position: relative;
    overflow-x: clip;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   FILM GRAIN / NOISE TEXTURE OVERLAY
   ========================================================================== */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 999;
    opacity: var(--grain-opacity);
    background-image: url("noise.png");
    background-repeat: repeat;
}

/* ==========================================================================
   CINEMATIC INTRO GREETING PRELOADER (KHMER -> ENGLISH -> SITE REVEAL)
   ========================================================================== */
body.intro-active {
    overflow: hidden !important;
    touch-action: none;
}

.intro-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    height: 100svh;
    height: 100dvh;
    background-color: #09090b;
    z-index: 999999;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    pointer-events: auto;
    contain: strict;
    transition: transform 0.9s cubic-bezier(0.77, 0, 0.175, 1),
                opacity 0.9s cubic-bezier(0.77, 0, 0.175, 1);
    will-change: transform, opacity;
}

/* Film grain texture on intro overlay matching the website */
.intro-overlay::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    opacity: 0.04;
    background-image: url("noise.png");
    background-repeat: repeat;
    transform: translateZ(0);
}

/* Ambient Radial Depth matching the website's hero glow */
.intro-bg-ambient {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.035) 0%, rgba(9, 9, 11, 0.4) 50%, #09090b 85%);
    pointer-events: none;
    z-index: 2;
}

.intro-content {
    position: relative;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 0 1.5rem;
}

.intro-word-container {
    position: relative;
    width: 100%;
    max-width: 800px;
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.intro-word {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, calc(-50% + 20px)) scale(0.96);
    color: var(--text-primary, #f4f4f5);
    text-align: center;
    white-space: nowrap;
    opacity: 0;
    filter: blur(8px);
    pointer-events: none;
    user-select: none;
    letter-spacing: -0.015em;
    line-height: 1.1;
    text-shadow: 0 4px 35px rgba(0, 0, 0, 0.9), 0 0 50px rgba(255, 255, 255, 0.15);
    transition: opacity 0.65s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.65s cubic-bezier(0.16, 1, 0.3, 1),
                filter 0.65s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: transform, opacity, filter;
}

.intro-word--khmer {
    font-family: var(--font-khmer, 'Noto Serif Khmer', serif);
    font-size: clamp(3.2rem, 7.5vw, 5.6rem);
    font-weight: 500;
}

.intro-word--english {
    font-family: var(--font-serif, 'Playfair Display', Georgia, serif);
    font-size: clamp(3.6rem, 8.5vw, 6.2rem);
    font-weight: 400;
    font-style: italic;
}

/* Active Entrance State */
.intro-word.state-enter {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
    filter: blur(0px);
}

/* Active Exit State (graceful upward drift and soft blur out) */
.intro-word.state-exit {
    opacity: 0;
    transform: translate(-50%, calc(-50% - 20px)) scale(1.03);
    filter: blur(6px);
    transition: opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.5s cubic-bezier(0.4, 0, 0.2, 1),
                filter 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Curtain Reveal Animation (Silky smooth lift upwards) */
.intro-overlay.intro-curtain-up {
    transform: translateY(-100%);
    opacity: 0.96;
    pointer-events: none;
}

/* ==========================================================================
   PRE-RENDERED 60 FPS CINEMATIC HERO (ULTRA-LOW GPU & ZERO LAG)
   ========================================================================== */
.hero-media-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    height: 100svh;
    height: 100dvh;
    z-index: 1;
    overflow: hidden;
    pointer-events: auto;
    background: var(--bg-main);
    transform: translate3d(0, 0, 0);
    will-change: transform;
}

.hero-media-container::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 32%;
    background: linear-gradient(to bottom, transparent, var(--bg-main));
    z-index: 4;
    pointer-events: none;
    opacity: 0;
}

html[data-theme="light"] .hero-media-container::after {
    opacity: 1;
}

.hero-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    user-select: none;
    -webkit-user-drag: none;
    z-index: 1;
    transform: translate3d(0, 0, 0);
    backface-visibility: hidden;
}

.hero-glow-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, rgba(9, 9, 11, 0.25) 0%, rgba(9, 9, 11, 0.55) 65%, rgba(9, 9, 11, 0.88) 100%);
    pointer-events: none;
    z-index: 3;
}

/* ==========================================================================
   MINIMALIST FLOATING NAVBAR
   ========================================================================== */
.navbar {
    position: fixed;
    top: 1.5rem;
    left: 50%;
    transform: translate3d(-50%, 0, 0);
    width: min(92%, 1050px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1.5rem;
    background: var(--nav-bg);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-pill);
    z-index: 50;
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    transition: border-color var(--transition-fast), background var(--transition-fast);
}

.navbar.scrolled {
    background: var(--nav-bg-scrolled);
    border-color: var(--border-hover);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--ink);
    display: inline-block;
}

.logo-text {
    font-weight: 600;
    font-size: 0.82rem;
    letter-spacing: 0.2em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.4rem;
    position: relative;
    padding: 0.2rem 0;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.82rem;
    font-weight: 400;
    letter-spacing: 0.04em;
    padding: 0.35rem 0.2rem;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link.active:not(.nav-link-cta) {
    color: var(--ink);
    font-weight: 500;
}

/* Sliding White Line Underline Indicator */
.nav-indicator-line {
    position: absolute;
    bottom: -2px;
    left: 0;
    height: 1.5px;
    background: var(--ink);
    border-radius: 2px;
    pointer-events: none;
    opacity: 0;
    width: 0;
    transform: translate3d(0, 0, 0);
    transition: transform 0.4s cubic-bezier(0.2, 0.9, 0.3, 1),
                width 0.4s cubic-bezier(0.2, 0.9, 0.3, 1),
                opacity 0.3s ease;
}

.nav-link-cta {
    padding: 0.35rem 0.95rem;
    background: transparent;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-pill);
    color: var(--text-primary);
    transition: border-color var(--transition-fast), background var(--transition-fast);
}

.nav-link-cta:hover {
    background: var(--glass-mid);
    border-color: var(--border-hover);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.theme-toggle {
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: var(--glass);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-pill);
    color: var(--text-primary);
    cursor: pointer;
    padding: 0;
    flex-shrink: 0;
    transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
}

.theme-toggle:hover {
    background: var(--glass-hover);
    border-color: var(--border-hover);
    transform: translateY(-1px);
}

.theme-icon {
    position: absolute;
    transition: opacity 0.35s cubic-bezier(0.16, 1, 0.3, 1), transform 0.45s cubic-bezier(0.16, 1, 0.3, 1);
}

.theme-icon--sun {
    opacity: 0;
    transform: rotate(-45deg) scale(0.6);
}

.theme-icon--moon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

html[data-theme="light"] .theme-icon--sun {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

html[data-theme="light"] .theme-icon--moon {
    opacity: 0;
    transform: rotate(45deg) scale(0.6);
}

/* ==========================================================================
   PAGE CONTAINER & SECTIONS
   ========================================================================== */
.page-container {
    position: relative;
    z-index: 10;
    width: 100%;
}

.hero-section {
    min-height: 100vh;
    min-height: 100svh;
    min-height: 100dvh;
    width: 100%;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 6rem 1.5rem 4rem;
    pointer-events: none;
}

/* Floating Hero Content Wrapper */
/* Static Fixed Hero Content Wrapper (No floating motion) */
.hero-content {
    position: relative;
    z-index: 5;
    pointer-events: auto;
    max-width: 900px;
    display: flex;
    flex-direction: column;
    align-items: center;
    transform: translate3d(0, 0, 0);
}

/* Seamless entrance fade when intro curtain lifts (stays fixed permanently) */
body.intro-active .hero-content {
    opacity: 0;
}

body.intro-revealed .hero-content {
    animation: heroEntranceFade 0.9s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes heroEntranceFade {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}

/* Floating status pill */
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.38rem 1rem;
    background: rgba(18, 18, 21, 0.72);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-pill);
    margin-bottom: 1.6rem;
    transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.45);
    user-select: none;
}

.hero-badge:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.55);
}

.hero-badge-pulse {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #10b981;
    box-shadow: 0 0 10px #10b981;
    position: relative;
    display: inline-block;
}

.hero-badge-pulse::after {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 50%;
    border: 1px solid #10b981;
    animation: heroPulseRing 2.2s cubic-bezier(0.2, 0.8, 0.4, 1) infinite;
}

@keyframes heroPulseRing {
    0% {
        transform: scale(0.8);
        opacity: 0.9;
    }
    100% {
        transform: scale(2.2);
        opacity: 0;
    }
}

.hero-badge-text {
    font-size: 0.74rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    color: #e4e4e7;
    text-transform: uppercase;
}

/* Floating Hero Title "Hello I'm Vatana" */
.hero-floating-title {
    font-family: var(--font-serif);
    font-size: clamp(2.35rem, 5.6vw, 4.4rem);
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -0.025em;
    color: #ffffff;
    margin-bottom: 1.05rem;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.35);
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: baseline;
    gap: 0.35em;
}

.hero-title-greeting {
    font-weight: 300;
    font-style: italic;
    color: rgba(255, 255, 255, 0.88);
}

.hero-title-name {
    font-weight: 500;
    font-style: normal;
    color: #ffffff;
    position: relative;
}

.hero-floating-subtitle {
    font-family: var(--font-sans);
    font-size: clamp(0.72rem, 1.35vw, 0.9rem);
    font-weight: 500;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: rgba(244, 244, 245, 0.92);
    margin-bottom: 1.75rem;
    text-shadow: 0 1px 8px rgba(0, 0, 0, 0.45);
}

/* Hero Action CTAs */
.hero-cta-group {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.58rem 1.25rem;
    border-radius: var(--radius-pill);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    text-decoration: none;
    transition: transform var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), color var(--transition-fast);
    cursor: pointer;
}

.hero-cta-btn--primary {
    background: #ffffff;
    color: #09090b;
    border: 1px solid #ffffff;
    box-shadow: 0 4px 22px rgba(255, 255, 255, 0.22);
}

.hero-cta-btn--primary:hover {
    background: #f4f4f5;
    border-color: #f4f4f5;
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(255, 255, 255, 0.35);
}

.hero-cta-btn--ghost {
    background: rgba(18, 18, 22, 0.82);
    color: #f4f4f5;
    border: 1px solid rgba(255, 255, 255, 0.16);
}

.hero-cta-btn--ghost:hover {
    background: rgba(28, 28, 34, 0.96);
    border-color: rgba(255, 255, 255, 0.32);
    transform: translateY(-2px);
    color: #ffffff;
}

/* Minimalist Scroll Prompt */
.hero-scroll-indicator {
    position: absolute;
    bottom: 2.25rem;
    left: 50%;
    transform: translateX(-50%);
    pointer-events: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.45rem;
    text-decoration: none;
    color: var(--text-muted);
    transition: color var(--transition-fast), transform var(--transition-fast);
    z-index: 5;
}

.hero-scroll-indicator:hover {
    color: var(--text-primary);
    transform: translate(-50%, -3px);
}

.scroll-indicator-mouse {
    width: 20px;
    height: 32px;
    border: 1.5px solid rgba(255, 255, 255, 0.28);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    padding-top: 5px;
    background: rgba(9, 9, 11, 0.55);
}

.scroll-indicator-wheel {
    width: 3px;
    height: 6px;
    background: #ffffff;
    border-radius: 2px;
    animation: scrollWheelPulse 1.8s cubic-bezier(0.65, 0, 0.35, 1) infinite;
}

@keyframes scrollWheelPulse {
    0% {
        opacity: 0;
        transform: translateY(0);
    }
    30% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        transform: translateY(10px);
    }
}

.scroll-indicator-text {
    font-size: 0.68rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    font-weight: 500;
}

@media (max-width: 768px) {
    .hero-floating-title {
        font-size: clamp(1.85rem, 7.5vw, 2.6rem);
        flex-direction: column;
        gap: 0.1em;
    }
    
    .hero-section {
        padding: 5rem 1.25rem 3rem;
    }

    .hero-scroll-indicator {
        bottom: 1.25rem;
    }
}

/* ==========================================================================
   INTERACTIVE 3D LANYARD CARD DROP (RIGHT SIDEBAR OF PROJECTS)
   ========================================================================== */
.lanyard-sidebar-container {
    position: absolute;
    top: 0;
    right: max(10px, calc((100vw - 1050px) / 2 - 270px));
    width: 320px;
    height: 640px;
    z-index: 20;
    pointer-events: auto;
}

.lanyard-wrapper {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    touch-action: none;
}

.lanyard-wrapper canvas {
    width: 100% !important;
    height: 100% !important;
    outline: none;
    touch-action: none;
}

@media (max-width: 1200px) {
    .lanyard-sidebar-container {
        right: 0.5rem;
        width: 280px;
        height: 560px;
        opacity: 0.9;
    }
}

@media (max-width: 900px) {
    .lanyard-sidebar-container {
        display: none;
    }
}

.content-section {
    width: 100%;
    padding: 5.5rem 1.5rem;
    display: flex;
    justify-content: center;
    position: relative;
}

.section-container {
    width: min(100%, 1050px);
}

.section-header {
    margin-bottom: 3.2rem;
}

.section-tag {
    display: inline-block;
    font-size: 0.72rem;
    letter-spacing: 0.22em;
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 3.8vw, 3rem);
    font-weight: 400;
    line-height: 1.2;
    letter-spacing: -0.01em;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    position: relative;
}

/* Typing animation characters (Hardware-accelerated zero-blur reveal) */
.section-title .char {
    display: inline;
    opacity: 0;
    transform: translateY(2px);
    transition: opacity 0.28s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                transform 0.28s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* Whitespace characters need to preserve space */
.section-title .char-space {
    display: inline;
    opacity: 0;
    transition: opacity 0.1s ease;
}

/* When the parent reveal-item becomes visible, animate chars */
.is-visible .section-title .char,
.is-visible .section-title .char-space,
/* Also handle the about section where section-title is directly inside reveal-item */
.section-title.typing-active .char,
.section-title.typing-active .char-space {
    opacity: 1;
    transform: translateY(0);
}

/* Blinking cursor at the end of the title */
.section-title .typing-cursor {
    display: inline-block;
    width: 2px;
    height: 0.85em;
    background: var(--text-primary);
    margin-left: 2px;
    vertical-align: baseline;
    position: relative;
    top: 0.08em;
    animation: cursorBlink 0.7s cubic-bezier(0.4, 0, 0.6, 1) infinite;
    opacity: 0;
    transition: opacity 0.15s ease;
}

.section-title .typing-cursor.cursor-active {
    opacity: 1;
}

.section-title .typing-cursor.cursor-done {
    animation: cursorFadeOut 0.6s ease forwards;
}

@keyframes cursorBlink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

@keyframes cursorFadeOut {
    0% { opacity: 1; }
    100% { opacity: 0; }
}

.section-desc {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.65;
    max-width: 620px;
}

/* ==========================================================================
   SECTION 01: SELECTED WORKS / FEATURED PROJECTS
   ========================================================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.6rem;
}

/* Base Card & Spotlight Glow System */
.project-card,
.skills-category-card,
.service-card,
.stat-card,
.contact-box {
    position: relative;
    overflow: hidden;
}

.project-card::before,
.skills-category-card::before,
.service-card::before,
.stat-card::before,
.contact-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: inherit;
    background: radial-gradient(
        450px circle at var(--mouse-x, -999px) var(--mouse-y, -999px),
        var(--spotlight),
        transparent 70%
    );
    opacity: var(--spotlight-opacity, 0);
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 1;
}

.project-card > *,
.skills-category-card > *,
.service-card > *,
.stat-card > *,
.contact-box > * {
    position: relative;
    z-index: 2;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-card);
    padding: 1.8rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast), opacity 0.35s ease, filter 0.35s ease, box-shadow 0.35s ease;
}

.project-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translate3d(0, -2px, 0);
}

/* Tech Stack Interactive Cross-Highlighting */
.project-card.tech-dimmed {
    opacity: 0.28;
    filter: grayscale(60%);
    transform: scale(0.985);
}

.project-card.tech-highlighted {
    border-color: var(--highlight-border);
    background: var(--card-highlight-bg);
    box-shadow: var(--highlight-glow);
    transform: translate3d(0, -4px, 0);
}

.tag.tag-highlighted {
    background: var(--glass-highlight);
    border-color: var(--highlight-border);
    color: var(--ink);
    transform: scale(1.06);
}

.stack-badge.stack-badge-active {
    border-color: var(--highlight-border);
    color: var(--ink);
    background: var(--glass-active);
    box-shadow: var(--highlight-glow);
    transform: translateY(-2px);
}

/* Project Image Preview Container */
.project-img-wrapper {
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: 8px;
    overflow: hidden;
    background: var(--project-img-bg);
    border: 1px solid var(--border-subtle);
    margin-bottom: 1.4rem;
}

.project-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease;
}

.project-card:hover .project-img {
    transform: scale(1.02);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.project-num {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    color: var(--text-muted);
}

.project-badge {
    font-size: 0.7rem;
    color: var(--text-muted);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 0.2rem 0.6rem;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-pill);
}

.project-title {
    font-family: var(--font-serif);
    font-size: 1.55rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.3rem;
}

.project-subtitle {
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-bottom: 0.85rem;
    font-weight: 400;
}

.project-description {
    font-size: 0.86rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.3rem;
    opacity: 0.9;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 1.2rem;
}

.tag {
    font-size: 0.72rem;
    padding: 0.22rem 0.65rem;
    background: var(--glass);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-pill);
    color: var(--text-secondary);
}

.project-footer {
    border-top: 1px solid var(--border-subtle);
    padding-top: 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.preview-link {
    --bg: var(--cta-bg);
    --hover-bg: #ff90e8;
    --hover-text: #000;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--cta-text);
    text-decoration: none;
    letter-spacing: 0.04em;
    padding: 0.35rem 0.85rem;
    cursor: pointer;
    border: 1px solid var(--border-hover);
    border-radius: 24px;
    background: var(--bg);
    transition: 0.2s ease;
}

.preview-link svg {
    transition: transform 0.2s ease, stroke 0.2s ease;
}

.preview-link:hover {
    color: var(--hover-text);
    border-color: var(--bg);
    background: var(--hover-bg);
    transform: translate(-0.25rem, -0.25rem);
    box-shadow: 0.25rem 0.25rem 5px var(--bg);
}

.preview-link:hover svg {
    transform: translate(2px, -2px);
}

.preview-link:active {
    transform: translate(0);
    box-shadow: none;
}

/* ==========================================================================
   INTERACTIVE PREVIEW BUTTON CORNER ALERT & ARROW GUIDE (SKETCH MATCH)
   ========================================================================== */
.preview-callout-wrapper {
    position: relative;
    display: inline-flex;
    align-items: center;
}

.preview-link-first {
    position: relative;
    overflow: visible;
}

/* Corner Vibration Alert Waves (( and )) with Space from Button */
.corner-alert-wave {
    position: absolute;
    pointer-events: none;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 2;
}

.wave--tl {
    top: -12px;
    left: -12px;
}

.wave--br {
    bottom: -12px;
    right: -12px;
    transform: rotate(180deg) scale(0.9);
}

.project-card.is-visible .corner-alert-wave,
.corner-pointer-arrow.is-active ~ .corner-alert-wave,
.corner-alert-wave.is-active {
    opacity: 1;
    transform: scale(1);
}

.project-card.is-visible .wave--br,
.wave--br.is-active {
    transform: rotate(180deg) scale(1);
}

/* When user clicks the preview button, smoothly dismiss all alert lines & pointer */
.preview-link-first.is-dismissed .corner-alert-wave,
.preview-link-first.is-dismissed .corner-pointer-arrow {
    opacity: 0 !important;
    transform: scale(0.65) !important;
    transition: opacity 0.35s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.35s cubic-bezier(0.16, 1, 0.3, 1) !important;
    pointer-events: none !important;
}

/* Faint Arc Track */
.arc-track {
    opacity: 0.22;
}

/* Running Loop Animation on the Side Lines (Short line -> stretches far -> contracts short again) */
.arc-running {
    stroke-dasharray: 14 150;
    stroke-dashoffset: 0;
}

.arc-outer {
    animation: sideLineRunLoop 1.6s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

.arc-inner {
    animation: sideLineRunLoop 1.6s cubic-bezier(0.4, 0, 0.2, 1) infinite 0.22s;
}

@keyframes sideLineRunLoop {
    0% {
        /* Starts as a short line at one end of the arc */
        stroke-dasharray: 12 150;
        stroke-dashoffset: 0;
        opacity: 0.15;
    }
    14% {
        opacity: 1;
    }
    48% {
        /* Goes far: stretches all the way along the curve */
        stroke-dasharray: 72 150;
        stroke-dashoffset: -12;
        opacity: 1;
    }
    76% {
        /* Comes short again: contracts into a short dash at the other end */
        stroke-dasharray: 12 150;
        stroke-dashoffset: -86;
        opacity: 1;
    }
    90% {
        stroke-dasharray: 8 150;
        stroke-dashoffset: -96;
        opacity: 0.25;
    }
    100% {
        stroke-dasharray: 12 150;
        stroke-dashoffset: -100;
        opacity: 0;
    }
}

/* ==========================================================================
   TOP-RIGHT POINTER ARROW (SPACED GRACEFULLY ABOVE BUTTON, NO FLOATING TEXT)
   ========================================================================== */
.corner-pointer-arrow {
    position: absolute;
    top: -26px;
    right: -4px;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    user-select: none;
    opacity: 0;
    transform: translate(4px, -4px);
    transition: opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 6;
}

.project-card.is-visible .corner-pointer-arrow,
.corner-pointer-arrow.is-active {
    opacity: 1;
    transform: translate(0, 0);
}

.preview-link:hover .corner-pointer-arrow {
    opacity: 0.25;
    transition: opacity 0.2s ease;
}

.pointer-arrow-svg {
    overflow: visible;
    animation: pointerArrowFloat 2.2s ease-in-out infinite alternate;
}

@keyframes pointerArrowFloat {
    0% {
        transform: translate(0, 0);
    }
    100% {
        /* Gentle diagonal 3px float pointing towards button with plenty of breathing space */
        transform: translate(-3px, 3px);
    }
}

.project-status-tag {
    font-size: 0.74rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

/* ==========================================================================
   SECTION 02: ABOUT ME
   ========================================================================== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3.5rem;
    align-items: flex-start;
}

.stats-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.85rem;
    margin-top: 2.8rem;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 10px;
    padding: 1.2rem 0.75rem;
    text-align: center;
}

.stat-number {
    display: block;
    font-family: var(--font-serif);
    font-size: 1.6rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.68rem;
    color: var(--text-muted);
    line-height: 1.35;
    display: block;
}

.about-text-lead {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--text-primary);
    margin-bottom: 1.1rem;
    font-weight: 400;
}

.about-text-body {
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 1.1rem;
}

/* ==========================================================================
   SECTION 02: SCROLL EXPAND INTERACTION (EDITORIAL STATEMENT)
   ========================================================================== */
.about-section {
    flex-direction: column;
    align-items: center;
    padding-left: 0;
    padding-right: 0;
    padding-bottom: 0;
    overflow: visible;
}

.about-section > .section-container {
    padding: 0 1.5rem;
}

.scroll-expand {
    position: relative;
    width: 100%;
    align-self: stretch;
    margin-top: 4.5rem;
}

.scroll-expand__track {
    position: relative;
    width: 100%;
    min-height: 240vh;
}

.scroll-expand__stage {
    position: sticky;
    top: 0;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 5;
    pointer-events: none;
    --se-title-size: 4rem;
}

.scroll-expand__frame {
    position: absolute;
    inset: 0;
    clip-path: inset(22% 29% 22% 29% round 22px);
    will-change: clip-path;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.12),
                0 30px 80px rgba(0, 0, 0, 0.9);
    background: #0a0a0a;
}

.scroll-expand__media {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    will-change: transform;
    transform-origin: center;
    user-select: none;
    -webkit-user-drag: none;
    filter: grayscale(100%) contrast(106%) brightness(88%);
}

.scroll-expand__scrim {
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(circle at center, rgba(10, 10, 10, 0.4) 0%, rgba(10, 10, 10, 0.85) 100%),
                linear-gradient(to top, rgba(10, 10, 10, 0.9), rgba(10, 10, 10, 0.3) 50%, rgba(10, 10, 10, 0.7));
    opacity: 0;
}

.scroll-expand__overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem 1.5rem;
    opacity: 0;
    will-change: opacity, transform;
    pointer-events: none;
    z-index: 2;
}

.scroll-expand__eyebrow {
    display: inline-block;
    font-size: 0.72rem;
    letter-spacing: 0.26em;
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 0.85rem;
    text-transform: uppercase;
}

.scroll-expand__statement {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 5.2vw, 4.4rem);
    font-weight: 500;
    line-height: 1.12;
    letter-spacing: -0.015em;
    color: #F5F5F5;
    text-transform: uppercase;
    text-shadow: 0 4px 28px rgba(0, 0, 0, 0.95), 0 1px 4px rgba(0, 0, 0, 0.95);
    margin-bottom: 0.75rem;
}

.scroll-expand__subtext {
    font-family: var(--font-sans);
    font-size: clamp(0.85rem, 1.2vw, 1.05rem);
    color: var(--text-secondary);
    max-width: 600px;
    letter-spacing: 0.02em;
    line-height: 1.6;
}

.scroll-expand__hint {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 2rem;
    text-align: center;
    font-size: 0.7rem;
    letter-spacing: 0.22em;
    color: rgba(255, 255, 255, 0.45);
    text-transform: uppercase;
    pointer-events: none;
    will-change: opacity, transform;
}

@media (max-width: 768px) {
    .scroll-expand {
        margin-top: 3.5rem;
    }
    .scroll-expand__statement {
        font-size: clamp(1.6rem, 6.2vw, 2.4rem);
    }
    .scroll-expand__hint {
        bottom: 1.25rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .scroll-expand__stage {
        position: relative;
        height: 70vh;
    }
    .scroll-expand__frame {
        clip-path: inset(4% 4% 4% 4% round 8px) !important;
    }
    .scroll-expand__overlay {
        opacity: 1 !important;
        transform: none !important;
    }
    .scroll-expand__hint {
        display: none;
    }
}

/* ==========================================================================
   SECTION 03: TECHNICAL SKILLS MATRIX
   ========================================================================== */
.skills-matrix-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.skills-category-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-card);
    padding: 2rem 1.6rem;
    transition: border-color var(--transition-fast), background var(--transition-fast);
}

.skills-category-card:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
}

.skills-cat-title {
    font-family: var(--font-serif);
    font-size: 1.18rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 1.2rem;
    padding-bottom: 0.6rem;
    border-bottom: 1px solid var(--border-subtle);
}

.stack-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
}

.stack-badge {
    font-size: 0.78rem;
    padding: 0.35rem 0.75rem;
    background: var(--glass);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-pill);
    color: var(--text-secondary);
    transition: border-color var(--transition-fast), color var(--transition-fast);
}

.stack-badge:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
}

/* ==========================================================================
   SECTION 04: CAPABILITIES & SERVICES
   ========================================================================== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.6rem;
}

.service-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-card);
    padding: 2rem;
    transition: border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

.service-card:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
    transform: translate3d(0, -2px, 0);
}

.service-icon {
    width: 38px;
    height: 38px;
    border-radius: 8px;
    background: var(--glass);
    border: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    margin-bottom: 1.2rem;
}

.service-title {
    font-family: var(--font-serif);
    font-size: 1.28rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.service-desc {
    font-size: 0.86rem;
    color: var(--text-secondary);
    line-height: 1.65;
}

/* ==========================================================================
   SECTION 05: CONTACT
   ========================================================================== */
.contact-section {
    scroll-margin-top: 6rem;
    overflow: hidden;
    position: relative;
}

.contact-section .section-container {
    position: relative;
    z-index: 1;
}

.contact-mountain {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: clamp(18rem, 38vw, 36rem);
    overflow: hidden;
    pointer-events: none;
    z-index: 0;
    /* fade top edge into dark background, visible at bottom */
    mask-image: linear-gradient(to top, black 40%, rgba(0,0,0,0.5) 75%, transparent 100%);
    -webkit-mask-image: linear-gradient(to top, black 40%, rgba(0,0,0,0.5) 75%, transparent 100%);
}

.contact-mountain img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center bottom;
    opacity: 0.55;
    filter: grayscale(1) brightness(0.8);
}

.contact-box {
    background: var(--contact-box);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: 3.2rem 2.8rem;
    position: relative;
    z-index: 1;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.contact-headline {
    font-family: var(--font-serif);
    font-size: clamp(1.8rem, 2.8vw, 2.4rem);
    font-weight: 400;
    line-height: 1.2;
    margin-bottom: 0.6rem;
    color: var(--text-primary);
}

.contact-subheadline {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    max-width: 540px;
    line-height: 1.6;
}

.email-copy-wrapper {
    margin-bottom: 2.2rem;
}

.email-copy-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.65rem 1.2rem;
    background: var(--glass);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-pill);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.86rem;
    cursor: pointer;
    transition: background var(--transition-fast), border-color var(--transition-fast);
}

.email-copy-btn:hover {
    background: var(--glass-mid);
    border-color: var(--border-hover);
}

.email-svg {
    color: var(--text-secondary);
    display: block;
}

.email-address {
    letter-spacing: 0.02em;
    font-weight: 500;
}

.copy-badge {
    font-size: 0.68rem;
    padding: 0.18rem 0.5rem;
    background: var(--glass-strong);
    border-radius: var(--radius-pill);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.email-copy-btn.copied .copy-badge {
    background: var(--cta-bg);
    color: var(--cta-text);
    font-weight: 600;
}

/* Contact Form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.2rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.form-group label {
    font-size: 0.68rem;
    letter-spacing: 0.12em;
    color: var(--text-muted);
    font-weight: 600;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem 0.95rem;
    background: var(--input-bg);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.86rem;
    outline: none;
    transition: border-color var(--transition-fast), background var(--transition-fast);
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
    background: var(--input-bg-focus);
    border-color: var(--input-border-focus);
}

.submit-btn {
    align-self: flex-start;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.8rem;
    background: var(--cta-bg);
    color: var(--cta-text);
    border: none;
    border-radius: var(--radius-pill);
    font-family: var(--font-sans);
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    cursor: pointer;
    transition: background var(--transition-fast), transform var(--transition-fast);
    margin-top: 0.3rem;
}

.submit-btn:hover {
    background: var(--cta-bg-hover);
    transform: translate3d(0, -1px, 0);
}

.form-status {
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-top: 0.3rem;
    min-height: 1rem;
}

/* ==========================================================================
   MINIMALIST FOOTER
   ========================================================================== */
.footer {
    width: 100%;
    border-top: 1px solid var(--border-subtle);
    padding: 2.2rem 1.5rem;
    display: flex;
    justify-content: center;
}

.footer-container {
    width: min(100%, 1050px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.2rem;
}

.footer-left {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.footer-brand {
    font-weight: 600;
    font-size: 0.8rem;
    letter-spacing: 0.18em;
    color: var(--text-primary);
}

.footer-copy {
    font-size: 0.72rem;
    color: var(--text-muted);
}

.footer-socials {
    display: flex;
    align-items: center;
    gap: 1.2rem;
}

.footer-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--text-primary);
}

.back-to-top {
    padding: 0.25rem 0.75rem;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-pill);
}

.back-to-top:hover {
    border-color: var(--border-hover);
}

/* ==========================================================================
   SMOOTH 60 FPS SCROLL REVEAL (GPU-ACCELERATED & ZERO LAG)
   ========================================================================== */
.reveal-item {
    opacity: 0;
    transform: translate3d(0, 28px, 0);
    transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, transform;
}

.reveal-item.is-visible {
    opacity: 1;
    transform: translate3d(0, 0, 0);
}

/* Smooth settling effect for project images when revealed */
.project-card .project-img {
    transform: scale(1.05);
    transition: transform 0.85s cubic-bezier(0.16, 1, 0.3, 1);
}

.project-card.is-visible .project-img {
    transform: scale(1);
}

.project-card.is-visible:hover .project-img {
    transform: scale(1.03);
}

/* ==========================================================================
   VERTICAL INTERACTIVE SCROLL RAIL (LEFT SIDE)
   ========================================================================== */
.scroll-rail {
    position: fixed;
    left: 2rem;
    top: 50%;
    transform: translate3d(0, -50%, 0);
    z-index: 45;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.1rem;
    user-select: none;
    pointer-events: auto;
    transition: opacity 0.3s ease;
}

.rail-counter {
    display: flex;
    align-items: baseline;
    gap: 0.25rem;
    font-family: var(--font-sans);
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    font-weight: 500;
}

.rail-num-active {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--ink);
    display: inline-block;
    min-width: 1.25rem;
    text-align: center;
    transition: transform 0.35s cubic-bezier(0.2, 0.9, 0.3, 1), opacity 0.25s ease;
}

.rail-num-active.num-changing {
    transform: translate3d(0, -6px, 0);
    opacity: 0;
}

.rail-num-divider {
    color: var(--text-muted);
    font-size: 0.65rem;
    opacity: 0.45;
}

.rail-num-total {
    color: var(--text-muted);
    font-size: 0.7rem;
}

.rail-track {
    position: relative;
    width: 22px;
    height: 190px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    padding: 4px 0;
}

/* The vertical thin line running through all section dots */
.rail-track::before {
    content: '';
    position: absolute;
    top: 4px;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%);
    width: 1px;
    background: var(--rail-line);
    border-radius: 1px;
    pointer-events: none;
}

/* Active progress fill that moves continuously with scroll (clean, crisp, no glow) */
.rail-track-fill {
    position: absolute;
    top: 4px;
    left: 50%;
    transform: translateX(-50%);
    width: 1.5px;
    height: 0px;
    background: linear-gradient(to bottom, color-mix(in srgb, var(--ink) 30%, transparent), var(--ink));
    border-radius: 1px;
    pointer-events: none;
    will-change: height;
    transition: height 0.06s linear;
}

/* Moving tip at the leading edge of the scroll line */
.rail-track-fill::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--ink);
}

/* Interactive section nodes */
.rail-dot {
    position: relative;
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    z-index: 2;
    cursor: pointer;
}

.rail-dot::before {
    content: '';
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--rail-dot);
    transition: all 0.25s cubic-bezier(0.2, 0.9, 0.3, 1);
}

.rail-dot:hover::before {
    background: var(--ink);
    transform: scale(1.5);
}

.rail-dot.active::before {
    width: 6px;
    height: 6px;
    background: var(--ink);
    transform: scale(1.15);
}

/* Tooltip on dot hover */
.rail-tooltip {
    position: absolute;
    left: calc(100% + 10px);
    top: 50%;
    transform: translate3d(-6px, -50%, 0);
    background: var(--bg-surface);
    border: 1px solid var(--border-hover);
    color: var(--text-primary);
    font-size: 0.68rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 0.25rem 0.6rem;
    border-radius: var(--radius-pill);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s cubic-bezier(0.2, 0.9, 0.3, 1);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.6);
}

.rail-dot:hover .rail-tooltip {
    opacity: 1;
    transform: translate3d(0, -50%, 0);
}

/* Micro vertical label below the track */
.rail-label {
    font-size: 0.62rem;
    letter-spacing: 0.22em;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    transform: rotate(180deg);
    transition: color 0.3s ease, opacity 0.3s ease;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ==========================================================================
   RESPONSIVE DESIGN (MOBILE & TABLET)
   ========================================================================== */
@media (max-width: 1200px) {
    .scroll-rail {
        left: 1.2rem;
    }
}

/* ==========================================================================
   MOBILE MENU TOGGLE & DRAWER OVERLAY
   ========================================================================== */
.mobile-menu-toggle {
    display: none;
    width: 38px;
    height: 38px;
    background: var(--glass);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-pill);
    cursor: pointer;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    padding: 0;
    transition: background 0.2s ease, border-color 0.2s ease;
    -webkit-tap-highlight-color: transparent;
    z-index: 52;
}

.mobile-menu-toggle:active {
    background: var(--glass-hover);
}

.hamburger-line {
    display: block;
    width: 16px;
    height: 1.5px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: transform 0.25s ease, opacity 0.25s ease;
}

.mobile-menu-toggle.is-active .hamburger-line:first-child {
    transform: translateY(3.25px) rotate(45deg);
}

.mobile-menu-toggle.is-active .hamburger-line:last-child {
    transform: translateY(-3.25px) rotate(-45deg);
}

.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    height: 100svh;
    height: 100dvh;
    background: var(--overlay-scrim);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    z-index: 48;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.3s ease;
    visibility: hidden;
    padding: 1.5rem;
}

.mobile-nav-overlay.is-open {
    opacity: 1;
    pointer-events: auto;
    visibility: visible;
}

.mobile-nav-content {
    width: min(100%, 340px);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    gap: 0.9rem;
    padding: 0.9rem 1.15rem;
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    background: var(--glass);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
    -webkit-tap-highlight-color: transparent;
}

.mobile-nav-link:active {
    transform: scale(0.98);
    background: var(--glass-strong);
    border-color: var(--border-hover);
}

.mobile-nav-num {
    font-size: 0.72rem;
    font-family: monospace;
    color: var(--text-muted);
    letter-spacing: 0.1em;
}

.mobile-nav-cta {
    background: var(--text-primary);
    color: var(--bg-main);
    font-weight: 600;
    margin-top: 0.4rem;
    justify-content: center;
}

.mobile-nav-cta .mobile-nav-num {
    color: color-mix(in srgb, var(--bg-main) 55%, transparent);
}

.mobile-nav-cta:active {
    background: var(--cta-bg-hover);
    color: var(--bg-main);
}

/* ==========================================================================
   RESPONSIVE DESIGN (MOBILE & TABLET)
   ========================================================================== */
@media (max-width: 1200px) {
    .scroll-rail {
        left: 1.2rem;
    }
}

@media (max-width: 900px) {
    .scroll-rail {
        display: none;
    }

    .nav-links {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .projects-grid,
    .services-grid,
    .skills-matrix-grid,
    .about-grid {
        grid-template-columns: 1fr;
        gap: 1.3rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .contact-box {
        padding: 2.2rem 1.5rem;
    }

    .stats-row {
        grid-template-columns: 1fr;
        margin-top: 1.6rem;
    }
}

@media (max-width: 640px) {
    .navbar {
        top: 1rem;
        width: calc(100% - 1.5rem);
        padding: 0.6rem 1.1rem;
    }

    .content-section {
        padding: 3.5rem 1rem;
    }

    .contact-section {
        scroll-margin-top: 5rem;
    }

    .section-header {
        margin-bottom: 2.2rem;
    }

    .section-title {
        font-size: 1.85rem;
    }

    .project-card {
        padding: 1.25rem;
    }

    .project-img-wrapper {
        border-radius: 10px;
    }

    .contact-headline {
        font-size: 1.75rem;
    }

    .email-copy-wrapper {
        margin-bottom: 1.75rem;
    }

    .email-copy-btn {
        width: 100%;
        justify-content: center;
        padding: 0.8rem 1rem;
    }

    .submit-btn {
        width: 100%;
        justify-content: center;
        height: 48px;
    }

    .footer-container {
        flex-direction: column;
        align-items: flex-start;
        gap: 1.25rem;
    }

    .footer-socials {
        width: 100%;
        justify-content: space-between;
    }
}

/* ==========================================================================
   THEME TRANSITION + LIGHT MODE SURFACE TUNING
   ========================================================================== */
::view-transition-old(root),
::view-transition-new(root) {
    animation: none;
    mix-blend-mode: normal;
}

::view-transition-old(root) {
    z-index: 1;
}

::view-transition-new(root) {
    z-index: 2147483646;
}

html[data-theme="light"] .scroll-rail {
    padding: 0.85rem 0.45rem;
    background: rgba(255, 252, 247, 0.72);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-pill);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

html[data-theme="light"] .contact-mountain img {
    opacity: 0.32;
    filter: grayscale(1) brightness(1.18) contrast(0.95);
}

html[data-theme="light"] .hero-badge {
    background: rgba(18, 18, 21, 0.55);
}

html[data-theme="light"] .navbar {
    box-shadow: 0 10px 30px rgba(24, 24, 27, 0.06);
}

@media (max-width: 900px) {
    .theme-toggle {
        width: 38px;
        height: 38px;
    }
}

/* ==========================================================================
   REDUCED MOTION ACCESSIBILITY & PERFORMANCE
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
    *, ::before, ::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}