/* ============================================================
   Liu Peng — Personal Portfolio
   Modern 2025/2026 Design System
   ============================================================ */

/* ============================================================
   1. DESIGN TOKENS / CSS CUSTOM PROPERTIES
   ============================================================ */

:root {
    /* Brand Colors */
    --clr-brand-400: #818cf8;
    --clr-brand-500: #6366f1;
    --clr-brand-600: #4f46e5;
    --clr-accent:    #22d3ee;
    --clr-amber:     #f59e0b;
    --clr-emerald:   #10b981;
    --clr-violet:    #8b5cf6;
    --clr-cyan:      #06b6d4;

    /* Surfaces — Light Mode */
    --bg:           #fafafa;
    --bg-secondary: #ffffff;
    --bg-elevated:  #f4f4f5;
    --bg-glass:     rgba(255,255,255,0.72);

    /* Text — Light Mode */
    --text:         #09090b;
    --text-muted:   #71717a;
    --text-faint:   #a1a1aa;

    /* Borders — Light Mode */
    --border:       #e4e4e7;
    --border-mid:   #d4d4d8;

    /* Gradients */
    --gradient-brand: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-aurora: radial-gradient(
        ellipse 80% 60% at 50% -10%,
        rgba(99,102,241,0.12) 0%,
        rgba(139,92,246,0.07) 40%,
        transparent 70%
    );
    --gradient-mesh:
        radial-gradient(ellipse 60% 80% at 20% 50%, rgba(99,102,241,0.10) 0%, transparent 60%),
        radial-gradient(ellipse 50% 70% at 80% 20%, rgba(139,92,246,0.09) 0%, transparent 55%),
        radial-gradient(ellipse 40% 60% at 60% 80%, rgba(245,158,11,0.06) 0%, transparent 50%);

    /* Shadows — Light Mode */
    --shadow-sm:  0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow:     0 4px 16px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.05);
    --shadow-lg:  0 12px 32px rgba(0,0,0,0.10), 0 4px 12px rgba(0,0,0,0.06);
    --shadow-xl:  0 24px 48px rgba(0,0,0,0.12), 0 8px 20px rgba(0,0,0,0.07);
    --glow-brand: 0 0 32px rgba(99,102,241,0.25), 0 0 64px rgba(99,102,241,0.10);
    --glow-sm:    0 0 16px rgba(99,102,241,0.20);

    /* Border Radius */
    --radius-sm:  8px;
    --radius:     12px;
    --radius-lg:  18px;
    --radius-xl:  24px;
    --radius-2xl: 32px;

    /* Spacing */
    --space-1:  0.25rem;
    --space-2:  0.5rem;
    --space-3:  0.75rem;
    --space-4:  1rem;
    --space-5:  1.25rem;
    --space-6:  1.5rem;
    --space-8:  2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;

    /* Fluid Type Scale */
    --text-xs:   clamp(0.70rem, 0.65rem + 0.25vw, 0.75rem);
    --text-sm:   clamp(0.80rem, 0.75rem + 0.25vw, 0.875rem);
    --text-base: clamp(0.9375rem, 0.90rem + 0.19vw, 1rem);
    --text-lg:   clamp(1.05rem, 0.95rem + 0.5vw, 1.125rem);
    --text-xl:   clamp(1.15rem, 1.0rem + 0.75vw, 1.25rem);
    --text-2xl:  clamp(1.35rem, 1.1rem + 1.25vw, 1.625rem);
    --text-3xl:  clamp(1.6rem, 1.2rem + 2vw, 2.125rem);
    --text-4xl:  clamp(2rem, 1.5rem + 2.5vw, 2.875rem);
    --text-hero: clamp(2.5rem, 1.75rem + 3.75vw, 4.5rem);

    /* Letter Spacing */
    --tracking-tight:   -0.04em;
    --tracking-snug:    -0.02em;
    --tracking-wide:     0.05em;
    --tracking-wider:    0.10em;
    --tracking-widest:   0.15em;

    /* Transitions */
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-smooth: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --dur-fast:    150ms;
    --dur-normal:  250ms;
    --dur-slow:    400ms;
    --dur-slower:  600ms;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    :root {
        --bg:           #09090b;
        --bg-secondary: #18181b;
        --bg-elevated:  #27272a;
        --bg-glass:     rgba(24,24,27,0.80);

        --text:         #fafafa;
        --text-muted:   #a1a1aa;
        --text-faint:   #71717a;

        --border:       #3f3f46;
        --border-mid:   #52525b;

        --gradient-aurora: radial-gradient(
            ellipse 80% 60% at 50% -10%,
            rgba(99,102,241,0.22) 0%,
            rgba(139,92,246,0.14) 40%,
            transparent 70%
        );
        --gradient-mesh:
            radial-gradient(ellipse 60% 80% at 20% 50%, rgba(99,102,241,0.18) 0%, transparent 60%),
            radial-gradient(ellipse 50% 70% at 80% 20%, rgba(139,92,246,0.16) 0%, transparent 55%),
            radial-gradient(ellipse 40% 60% at 60% 80%, rgba(245,158,11,0.10) 0%, transparent 50%);

        --shadow-sm:  0 1px 3px rgba(0,0,0,0.35);
        --shadow:     0 4px 16px rgba(0,0,0,0.45);
        --shadow-lg:  0 12px 32px rgba(0,0,0,0.55);
        --shadow-xl:  0 24px 48px rgba(0,0,0,0.65);
        --glow-brand: 0 0 32px rgba(99,102,241,0.40), 0 0 64px rgba(99,102,241,0.18);
        --glow-sm:    0 0 16px rgba(99,102,241,0.30);
    }
}


/* ============================================================
   2. RESET & BASE
   ============================================================ */

*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    font-size: var(--text-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background var(--dur-normal), color var(--dur-normal);
}

/* Custom Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: rgba(99,102,241,0.30);
    border-radius: 100px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(99,102,241,0.55); }
* { scrollbar-width: thin; scrollbar-color: rgba(99,102,241,0.30) transparent; }

a { color: var(--clr-brand-500); text-decoration: none; }
a:hover { color: var(--clr-brand-600); }

img { max-width: 100%; height: auto; display: block; }

ul, ol { list-style: none; }


/* ============================================================
   3. LAYOUT UTILITIES
   ============================================================ */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.site-main { min-height: 100vh; }

/* Content wrapper after hero */
.content-wrapper {
    padding: 0 0 var(--space-16);
}

/* Glass Card Utility */
.glass-card {
    background: var(--bg-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid rgba(255,255,255,0.18);
    box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255,255,255,0.20);
}

@media (prefers-color-scheme: dark) {
    .glass-card {
        border-color: rgba(255,255,255,0.07);
        box-shadow: var(--shadow-xl), inset 0 1px 0 rgba(255,255,255,0.05);
    }
}

/* Section Headers */
.section-header {
    margin-bottom: var(--space-12);
    text-align: center;
}

.section-eyebrow {
    display: inline-block;
    font-size: var(--text-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: var(--tracking-widest);
    color: var(--clr-brand-500);
    margin-bottom: var(--space-3);
}

.section-title {
    font-size: var(--text-4xl);
    font-weight: 700;
    letter-spacing: var(--tracking-tight);
    color: var(--text);
    margin: 0;
    line-height: 1.15;
}

.gradient-text {
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}


/* ============================================================
   4. TYPOGRAPHY
   ============================================================ */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: var(--text);
    line-height: 1.25;
    letter-spacing: var(--tracking-snug);
}

h1 { font-size: var(--text-4xl); margin-bottom: var(--space-4); }
h2 { font-size: var(--text-3xl); margin-bottom: var(--space-4); }
h3 { font-size: var(--text-xl); margin-bottom: var(--space-3); }

p {
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: var(--space-4);
}

p:last-child { margin-bottom: 0; }

strong { color: var(--text); font-weight: 600; }


/* ============================================================
   5. NAVIGATION
   ============================================================ */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    padding: var(--space-3) 0;
    background: transparent;
    border-bottom: 1px solid transparent;
    transition: padding var(--dur-normal) var(--ease-smooth),
                background var(--dur-normal),
                border-color var(--dur-normal),
                box-shadow var(--dur-normal);
}

.site-header.scrolled {
    background: rgba(250,250,250,0.88);
    backdrop-filter: blur(20px) saturate(160%);
    -webkit-backdrop-filter: blur(20px) saturate(160%);
    border-bottom-color: var(--border);
    box-shadow: 0 1px 20px rgba(0,0,0,0.06);
}

@media (prefers-color-scheme: dark) {
    .site-header.scrolled {
        background: rgba(9,9,11,0.90);
    }
}

.main-nav {
    display: flex;
    align-items: center;
    min-height: 52px;
    gap: var(--space-8);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    flex-shrink: 0;
}

.nav-brand-name {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--text);
    letter-spacing: var(--tracking-snug);
    transition: color var(--dur-fast);
}

.nav-brand:hover .nav-brand-name { color: var(--clr-brand-500); }

.header-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid var(--clr-brand-500);
    object-fit: cover;
    transition: transform var(--dur-normal) var(--ease-spring),
                box-shadow var(--dur-normal);
}

.nav-brand:hover .header-avatar {
    transform: scale(1.08);
    box-shadow: var(--glow-sm);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    list-style: none;
    margin: 0 0 0 auto;
    padding: 0;
}

.nav-menu a {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    border-radius: 100px;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-muted);
    text-decoration: none;
    transition: color var(--dur-fast), background var(--dur-fast);
    line-height: 1;
    white-space: nowrap;
}

.nav-menu a:hover {
    color: var(--text);
    background: rgba(99,102,241,0.07);
}

.nav-menu a[aria-current="page"],
.nav-menu a.active {
    color: var(--clr-brand-500);
    background: rgba(99,102,241,0.10);
}

.nav-cta {
    background: var(--clr-brand-500) !important;
    color: white !important;
    padding: var(--space-2) var(--space-5) !important;
    font-weight: 600 !important;
    box-shadow: var(--shadow-sm);
    transition: background var(--dur-fast),
                transform var(--dur-fast) var(--ease-spring),
                box-shadow var(--dur-fast) !important;
}

.nav-cta:hover {
    background: var(--clr-brand-600) !important;
    transform: translateY(-1px) !important;
    box-shadow: var(--shadow), var(--glow-sm) !important;
    color: white !important;
}

/* Hamburger Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-sm);
    margin-left: auto;
    transition: background var(--dur-fast);
}

.nav-toggle:hover { background: rgba(99,102,241,0.07); }

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 768px) {
    .nav-toggle { display: flex; }

    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(250,250,250,0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        gap: 0;
        padding: var(--space-2) 0;
        z-index: 99;
        margin: 0;
    }

    @media (prefers-color-scheme: dark) {
        .nav-menu {
            background: rgba(9,9,11,0.98);
        }
    }

    .nav-menu.open { display: flex; }

    .nav-menu li { width: 100%; }

    .nav-menu a {
        display: block;
        padding: var(--space-3) var(--space-6);
        border-radius: 0;
    }

    .nav-cta {
        margin: var(--space-2) var(--space-6);
        width: calc(100% - var(--space-12));
        border-radius: 100px !important;
        text-align: center;
        display: flex !important;
        justify-content: center;
    }
}


/* ============================================================
   6. BUTTONS
   ============================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-sm);
    font-weight: 600;
    text-decoration: none;
    border-radius: 100px;
    border: none;
    cursor: pointer;
    transition: transform var(--dur-fast) var(--ease-spring),
                box-shadow var(--dur-fast),
                background var(--dur-fast);
    white-space: nowrap;
    letter-spacing: var(--tracking-wide);
    line-height: 1;
}

.btn-primary {
    background: var(--clr-brand-500);
    color: white;
    box-shadow: var(--shadow);
}

.btn-primary:hover {
    background: var(--clr-brand-600);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-glow {
    box-shadow: var(--shadow), var(--glow-brand);
}

.btn-glow:hover {
    box-shadow: var(--shadow-lg), var(--glow-brand);
}

.btn-secondary {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border-mid);
}

.btn-secondary:hover {
    background: var(--bg-elevated);
    border-color: var(--clr-brand-500);
    color: var(--clr-brand-500);
    transform: translateY(-2px);
}

.btn-ghost {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-ghost:hover {
    background: var(--bg-elevated);
    border-color: var(--clr-brand-500);
    color: var(--clr-brand-500);
    transform: translateY(-2px);
}


/* ============================================================
   7. HERO SECTION
   ============================================================ */

.hero-section {
    min-height: 100svh;
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding: var(--space-24) 0 var(--space-16);
}

.hero-bg-mesh {
    position: absolute;
    inset: 0;
    background: var(--gradient-mesh);
    pointer-events: none;
}

.hero-grain {
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 256 256'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
    pointer-events: none;
    opacity: 0.5;
}

.hero-inner {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: var(--space-16);
    align-items: center;
    position: relative;
    z-index: 1;
}

/* Hero text column */
.hero-text { /* left column */ }

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: var(--tracking-wider);
    text-transform: uppercase;
    margin-bottom: var(--space-6);
    padding: var(--space-2) var(--space-4);
    background: var(--bg-glass);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--border);
    border-radius: 100px;
    width: fit-content;
    animation: slide-up-fade 0.6s var(--ease-smooth) 0.1s both;
}

.hero-status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--clr-emerald);
    box-shadow: 0 0 0 2px rgba(16,185,129,0.25);
    animation: pulse-dot 2s ease-in-out infinite;
    flex-shrink: 0;
}

@keyframes pulse-dot {
    0%, 100% { box-shadow: 0 0 0 2px rgba(16,185,129,0.25); }
    50%       { box-shadow: 0 0 0 6px rgba(16,185,129,0.0); }
}

.hero-title {
    font-size: var(--text-hero);
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: var(--tracking-tight);
    margin-bottom: var(--space-6);
    animation: slide-up-fade 0.7s var(--ease-smooth) 0.2s both;
}

.hero-name {
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    background-size: 200% 100%;
    animation: slide-up-fade 0.7s var(--ease-smooth) 0.2s both,
               gradient-shift 5s ease infinite 0.9s;
}

@keyframes gradient-shift {
    0%, 100% { background-position: 0% 50%; }
    50%       { background-position: 100% 50%; }
}

.hero-role {
    display: block;
    color: var(--text);
}

.hero-description {
    font-size: var(--text-xl);
    color: var(--text-muted);
    line-height: 1.7;
    max-width: 520px;
    margin-bottom: var(--space-8);
    animation: slide-up-fade 0.7s var(--ease-smooth) 0.35s both;
}

.hero-actions {
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
    margin-bottom: var(--space-8);
    animation: slide-up-fade 0.7s var(--ease-smooth) 0.5s both;
}

.hero-social {
    display: flex;
    gap: var(--space-3);
    animation: slide-up-fade 0.6s var(--ease-smooth) 0.65s both;
}

.hero-social-link {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 1rem;
    text-decoration: none;
    transition: background var(--dur-fast), color var(--dur-fast),
                transform var(--dur-fast) var(--ease-spring),
                border-color var(--dur-fast);
}

.hero-social-link:hover {
    background: rgba(99,102,241,0.10);
    border-color: rgba(99,102,241,0.30);
    color: var(--clr-brand-500);
    transform: translateY(-2px);
}

/* Hero card cluster (floating cards) */
.hero-card-cluster {
    position: relative;
    height: 380px;
    animation: slide-up-fade 0.8s var(--ease-smooth) 0.3s both;
}

.hero-avatar-card {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: var(--space-4) var(--space-5);
    display: flex;
    align-items: center;
    gap: var(--space-4);
    border-radius: var(--radius-lg);
    width: 220px;
    animation: float-card 6s ease-in-out infinite;
}

@keyframes float-card {
    0%, 100% { transform: translate(-50%, -50%) translateY(0px); }
    50%       { transform: translate(-50%, -50%) translateY(-10px); }
}

.hero-avatar-img {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    border: 2px solid var(--clr-brand-500);
    object-fit: cover;
    flex-shrink: 0;
}

.hero-card-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.hero-card-info strong {
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--text);
}

.hero-card-info span {
    font-size: var(--text-xs);
    color: var(--text-muted);
}

.hero-stat-card {
    position: absolute;
    padding: var(--space-4) var(--space-5);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    border-radius: var(--radius-lg);
    gap: var(--space-1);
    animation: float-card 6s ease-in-out infinite;
}

.hero-stat-card i {
    font-size: 1.4rem;
    color: var(--clr-amber);
    margin-bottom: var(--space-1);
}

.hero-stat-card--yrs {
    top: 5%;
    right: 0;
    animation-delay: -1s;
}

.hero-stat-card--award {
    bottom: 20%;
    left: 0;
    animation-delay: -2s;
}

.hero-stat-card--proj {
    bottom: 5%;
    right: 10%;
    animation-delay: -3.5s;
}

.stat-number {
    font-size: var(--text-3xl);
    font-weight: 800;
    color: var(--clr-brand-500);
    line-height: 1;
    letter-spacing: var(--tracking-tight);
}

.stat-label {
    font-size: var(--text-xs);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
    font-weight: 600;
}

/* Scroll indicator */
.hero-scroll-indicator {
    position: absolute;
    bottom: var(--space-8);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.scroll-line {
    width: 1px;
    height: 48px;
    background: linear-gradient(to bottom, var(--clr-brand-500), transparent);
    animation: scroll-pulse 2.5s ease-in-out infinite;
}

@keyframes scroll-pulse {
    0%         { transform: scaleY(0); transform-origin: top; opacity: 1; }
    45%        { transform: scaleY(1); transform-origin: top; opacity: 1; }
    55%        { transform: scaleY(1); transform-origin: bottom; opacity: 1; }
    100%       { transform: scaleY(0); transform-origin: bottom; opacity: 0; }
}

/* Hero entrance keyframe */
@keyframes slide-up-fade {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Hero responsive */
@media (max-width: 960px) {
    .hero-inner {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero-card-cluster { display: none; }
    .hero-description { max-width: none; margin-left: auto; margin-right: auto; }
    .hero-actions { justify-content: center; }
    .hero-social { justify-content: center; }
    .hero-eyebrow { margin-left: auto; margin-right: auto; }
}

@media (max-width: 480px) {
    .hero-section { padding-top: var(--space-16); }
    .hero-actions { flex-direction: column; align-items: center; }
}


/* ============================================================
   8. HOMEPAGE — BENTO GRID
   ============================================================ */

.features-section {
    padding: var(--space-8) 0 var(--space-4);
}

.bento-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    grid-template-rows: auto auto;
    gap: var(--space-4);
    margin-top: var(--space-8);
}

.bento-card {
    position: relative;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    overflow: hidden;
    transition: transform var(--dur-normal) var(--ease-spring),
                box-shadow var(--dur-normal),
                border-color var(--dur-normal);
}

@media (prefers-color-scheme: dark) {
    .bento-card { background: var(--bg-elevated); }
}

.bento-card--wide         { grid-column: 1; grid-row: 1 / 3; }
.bento-card--right-top    { grid-column: 2; grid-row: 1; }
.bento-card--right-bottom { grid-column: 2; grid-row: 2; }

.bento-card-bg {
    position: absolute;
    inset: 0;
    background: radial-gradient(
        ellipse 70% 60% at 110% -10%,
        rgba(var(--card-r), var(--card-g), var(--card-b), 0.10) 0%,
        transparent 60%
    );
    pointer-events: none;
    transition: opacity var(--dur-slow);
}

.bento-card:hover {
    transform: translateY(-6px) scale(1.005);
    box-shadow: var(--shadow-xl);
    border-color: rgba(99,102,241,0.30);
}

.bento-icon-wrap {
    width: 52px;
    height: 52px;
    border-radius: var(--radius);
    background: rgba(99,102,241,0.10);
    border: 1px solid rgba(99,102,241,0.18);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    color: var(--clr-brand-500);
    margin-bottom: var(--space-5);
    transition: transform var(--dur-normal) var(--ease-spring),
                background var(--dur-normal);
}

.bento-card:hover .bento-icon-wrap {
    transform: rotate(-8deg) scale(1.12);
    background: rgba(99,102,241,0.18);
}

.bento-card h3 {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--text);
    margin-bottom: var(--space-3);
    letter-spacing: var(--tracking-snug);
}

.bento-card p {
    color: var(--text-muted);
    line-height: 1.65;
    font-size: var(--text-base);
    margin-bottom: var(--space-6);
}

.bento-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--clr-brand-500);
    font-weight: 600;
    font-size: var(--text-sm);
    text-decoration: none;
    transition: gap var(--dur-fast) var(--ease-spring),
                color var(--dur-fast);
}

.bento-link:hover {
    gap: var(--space-3);
    color: var(--clr-brand-600);
}

.bento-tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-top: var(--space-6);
}

.bento-tech-tags span {
    font-size: var(--text-xs);
    padding: var(--space-1) var(--space-3);
    border-radius: 100px;
    background: rgba(99,102,241,0.08);
    border: 1px solid rgba(99,102,241,0.15);
    color: var(--clr-brand-400);
    font-weight: 500;
    letter-spacing: var(--tracking-wide);
}

@media (max-width: 768px) {
    .bento-grid {
        grid-template-columns: 1fr;
        grid-template-rows: auto;
    }
    .bento-card--wide { grid-row: auto; }
    .bento-card--right-top { grid-column: 1; grid-row: auto; }
    .bento-card--right-bottom { grid-column: 1; grid-row: auto; }
}


/* ============================================================
   9. ABOUT PAGE
   ============================================================ */

.about-hero {
    padding: var(--space-20) var(--space-6) var(--space-12);
    text-align: center;
    position: relative;
    overflow: hidden;
    margin-left: calc(-1 * var(--space-6));
    margin-right: calc(-1 * var(--space-6));
}

.about-hero-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-aurora);
    pointer-events: none;
}

.avatar-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
    position: relative;
    z-index: 1;
}

.avatar-ring-wrap {
    position: relative;
    width: 140px;
    height: 140px;
    margin-bottom: var(--space-2);
}

.avatar-ring-wrap::before {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    background: var(--gradient-brand);
    animation: spin-ring 4s linear infinite;
    z-index: 0;
}

.avatar-ring-wrap::after {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: 50%;
    background: var(--bg);
    z-index: 1;
}

@keyframes spin-ring {
    from { transform: rotate(0deg); }
    to   { transform: rotate(360deg); }
}

.avatar {
    position: relative;
    z-index: 2;
    width: 128px;
    height: 128px;
    border-radius: 50%;
    overflow: hidden;
    background: var(--clr-brand-500);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 6px;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-fallback {
    color: white;
    font-size: 2.5rem;
    font-weight: 700;
}

.avatar-section h1 {
    font-size: var(--text-4xl);
    margin: 0 0 var(--space-1);
    letter-spacing: var(--tracking-tight);
}

.role-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-5);
    background: rgba(99,102,241,0.10);
    border: 1px solid rgba(99,102,241,0.22);
    border-radius: 100px;
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--clr-brand-500);
}

.avatar-section .subtitle {
    font-size: var(--text-base);
    color: var(--text-muted);
    margin: 0;
}

.about-content { max-width: 900px; margin: 0 auto; }

.about-section,
.skills-section,
.experience-section,
.education-section,
.awards-section,
.interests-section {
    margin-bottom: var(--space-16);
}

.about-section h2,
.skills-section h2,
.experience-section h2,
.education-section h2,
.awards-section h2,
.interests-section h2 {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-8);
    letter-spacing: var(--tracking-tight);
}

.about-section p {
    font-size: var(--text-lg);
    line-height: 1.75;
}


/* ============================================================
   10. EXPERIENCE TIMELINE
   ============================================================ */

.timeline-list {
    position: relative;
    padding-left: 0;
}

.timeline-item {
    display: grid;
    grid-template-columns: 28px 1fr;
    gap: var(--space-5);
    margin-bottom: var(--space-5);
    position: relative;
}

.timeline-connector {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: var(--space-5);
}

.timeline-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--clr-brand-500);
    border: 2px solid var(--bg);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.22);
    flex-shrink: 0;
    z-index: 1;
    transition: transform var(--dur-normal) var(--ease-spring),
                box-shadow var(--dur-normal);
}

.timeline-item:hover .timeline-dot {
    transform: scale(1.5);
    box-shadow: 0 0 0 5px rgba(99,102,241,0.25), var(--glow-sm);
}

.timeline-line {
    width: 2px;
    flex-grow: 1;
    background: linear-gradient(to bottom,
        rgba(99,102,241,0.38),
        rgba(99,102,241,0.04)
    );
    margin-top: var(--space-2);
    margin-bottom: calc(-1 * var(--space-5));
}

.timeline-item:last-child .timeline-line { display: none; }

.timeline-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    transition: transform var(--dur-normal) var(--ease-spring),
                box-shadow var(--dur-normal),
                border-color var(--dur-normal);
}

@media (prefers-color-scheme: dark) {
    .timeline-card { background: var(--bg-elevated); }
}

.timeline-card:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-lg);
}

.timeline-item.current .timeline-card {
    border-color: rgba(99,102,241,0.35);
    box-shadow: var(--shadow), var(--glow-brand);
}

.timeline-item.current .timeline-dot {
    background: var(--gradient-brand);
    width: 14px;
    height: 14px;
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
    flex-wrap: wrap;
}

.timeline-title-group { flex: 1; }

.timeline-role {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text);
    margin: 0 0 var(--space-1);
    letter-spacing: var(--tracking-snug);
}

.company,
.timeline-company {
    font-size: var(--text-sm);
    color: var(--text-muted);
    font-weight: 500;
    margin: 0;
}

.timeline-badge--current {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-1) var(--space-3);
    border-radius: 100px;
    background: rgba(16,185,129,0.12);
    border: 1px solid rgba(16,185,129,0.28);
    color: var(--clr-emerald);
    font-size: var(--text-xs);
    font-weight: 700;
    white-space: nowrap;
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    flex-shrink: 0;
}

.badge-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--clr-emerald);
    animation: pulse-dot 2s ease-in-out infinite;
    flex-shrink: 0;
}

.timeline-achievements,
.experience-item ul {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin: 0;
}

.timeline-achievements li,
.experience-item li {
    padding-left: var(--space-5);
    position: relative;
    color: var(--text-muted);
    font-size: var(--text-base);
    line-height: 1.65;
    margin: 0;
}

.timeline-achievements li::before,
.experience-item li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 9px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--clr-brand-500);
    opacity: 0.55;
}

/* Legacy experience-item styles */
.experience-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
}

@media (prefers-color-scheme: dark) {
    .experience-item { background: var(--bg-elevated); }
}

.experience-item h3 {
    color: var(--text);
    font-size: var(--text-xl);
    margin-bottom: var(--space-1);
}

/* Toggle show more */
#toggle-experience {
    display: block;
    margin: var(--space-6) auto 0;
    background: var(--clr-brand-500);
    color: white;
    border: none;
    border-radius: 100px;
    font-size: var(--text-sm);
    font-weight: 600;
    padding: var(--space-3) var(--space-8);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: background var(--dur-fast), box-shadow var(--dur-fast),
                transform var(--dur-fast) var(--ease-spring);
    letter-spacing: var(--tracking-wide);
}

#toggle-experience:hover {
    background: var(--clr-brand-600);
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}


/* ============================================================
   11. SKILLS
   ============================================================ */

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-5);
    margin-top: var(--space-6);
}

.skill-card,
.skill-category {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    transition: transform var(--dur-normal) var(--ease-spring),
                box-shadow var(--dur-normal),
                border-color var(--dur-normal);
}

@media (prefers-color-scheme: dark) {
    .skill-card, .skill-category { background: var(--bg-elevated); }
}

.skill-card:hover,
.skill-category:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(99,102,241,0.28);
}

.skill-card-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-5);
}

.skill-category-emoji {
    font-size: 1.8rem;
    line-height: 1;
    flex-shrink: 0;
}

.skill-card-header h3,
.skill-category h3 {
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--text);
    margin: 0;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.skill-tag {
    font-size: var(--text-xs);
    font-weight: 500;
    padding: var(--space-2) var(--space-3);
    border-radius: 100px;
    background: rgba(99,102,241,0.07);
    border: 1px solid rgba(99,102,241,0.14);
    color: var(--text-muted);
    transition: background var(--dur-fast), color var(--dur-fast),
                border-color var(--dur-fast);
    cursor: default;
    white-space: nowrap;
}

.skill-tag:hover {
    background: rgba(99,102,241,0.15);
    color: var(--clr-brand-400);
    border-color: rgba(99,102,241,0.28);
}

/* Legacy skill list items */
.skill-category ul { list-style: none; padding: 0; margin-top: var(--space-4); }
.skill-category li {
    padding: var(--space-2) 0;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
    font-size: var(--text-sm);
}
.skill-category li:last-child { border-bottom: none; }


/* ============================================================
   12. EDUCATION
   ============================================================ */

.about-card-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-5);
}

.education-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    transition: transform var(--dur-normal) var(--ease-spring),
                box-shadow var(--dur-normal),
                border-color var(--dur-normal);
}

@media (prefers-color-scheme: dark) {
    .education-item { background: var(--bg-elevated); }
}

.education-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(99,102,241,0.28);
}

.education-item h3 {
    font-size: var(--text-lg);
    color: var(--text);
    margin-bottom: var(--space-2);
}

.institution {
    font-size: var(--text-sm);
    color: var(--clr-brand-500);
    font-weight: 600;
    margin-bottom: var(--space-3);
}

.education-item a {
    color: var(--clr-brand-500);
    font-weight: 500;
    text-decoration: underline;
    text-underline-offset: 3px;
}

@media (max-width: 800px) {
    .about-card-grid { grid-template-columns: 1fr; }
}


/* ============================================================
   13. AWARDS
   ============================================================ */

.awards-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-5);
}

.award-card,
.award-item {
    position: relative;
    overflow: hidden;
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(245,158,11,0.22);
    background: rgba(245,158,11,0.04);
    transition: transform var(--dur-normal) var(--ease-spring),
                box-shadow var(--dur-normal);
}

@media (prefers-color-scheme: dark) {
    .award-card, .award-item { background: rgba(245,158,11,0.06); }
}

.award-card:hover,
.award-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), 0 0 24px rgba(245,158,11,0.12);
}

.award-watermark {
    position: absolute;
    right: -12px;
    bottom: -18px;
    font-size: 6.5rem;
    color: rgba(245,158,11,0.06);
    line-height: 1;
    pointer-events: none;
    user-select: none;
}

.award-icon-wrap {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.award-icon-wrap i {
    font-size: 1.5rem;
    color: var(--clr-amber);
    position: relative;
    z-index: 1;
}

.award-content { position: relative; z-index: 1; }

.award-title,
.award-item h3 {
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--text);
    margin-bottom: var(--space-2);
}

.award-issuer {
    font-size: var(--text-xs);
    color: var(--clr-amber);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
    margin-bottom: var(--space-3);
}

.award-card p,
.award-item p:last-child {
    font-size: var(--text-sm);
    color: var(--text-muted);
    line-height: 1.65;
    margin: 0;
}

@media (max-width: 768px) {
    .awards-grid { grid-template-columns: 1fr; }
}


/* ============================================================
   14. INTERESTS
   ============================================================ */

.interests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-4);
    margin-top: var(--space-6);
}

.interest-card {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    padding: var(--space-5);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: transform var(--dur-normal) var(--ease-spring),
                border-color var(--dur-normal),
                box-shadow var(--dur-normal);
}

@media (prefers-color-scheme: dark) {
    .interest-card { background: var(--bg-elevated); }
}

.interest-card:hover {
    transform: translateY(-3px);
    border-color: rgba(99,102,241,0.28);
    box-shadow: var(--shadow);
}

.interest-icon,
.interest-icon-wrap {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    background: rgba(99,102,241,0.08);
    border: 1px solid rgba(99,102,241,0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--clr-brand-500);
    transition: transform var(--dur-normal) var(--ease-spring);
}

.interest-card:hover .interest-icon,
.interest-card:hover .interest-icon-wrap {
    transform: rotate(-8deg) scale(1.1);
}

.interest-content h3,
.interest-card h3 {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--text);
    margin: 0 0 var(--space-1);
}

.interest-content p,
.interest-card p {
    font-size: var(--text-sm);
    color: var(--text-muted);
    margin: 0;
    line-height: 1.55;
}


/* ============================================================
   15. CONTACT CTA
   ============================================================ */

.contact-cta {
    margin-top: var(--space-16);
    margin-bottom: var(--space-8);
}

.contact-cta-inner {
    border-radius: var(--radius-xl);
    padding: var(--space-16) var(--space-8);
    text-align: center;
}

.contact-cta-inner h2 {
    font-size: var(--text-4xl);
    margin-bottom: var(--space-4);
    letter-spacing: var(--tracking-tight);
}

.contact-cta-inner p {
    font-size: var(--text-xl);
    color: var(--text-muted);
    margin-bottom: var(--space-8);
}


/* ============================================================
   16. PROJECTS PAGE
   ============================================================ */

.projects-hero {
    position: relative;
    overflow: hidden;
    padding: var(--space-20) var(--space-6) var(--space-12);
    text-align: center;
    margin-left: calc(-1 * var(--space-6));
    margin-right: calc(-1 * var(--space-6));
}

.projects-hero-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-aurora);
    pointer-events: none;
}

.projects-hero h1 {
    font-size: var(--text-4xl);
    font-weight: 700;
    letter-spacing: var(--tracking-tight);
    margin-bottom: var(--space-4);
    position: relative;
    z-index: 1;
}

.projects-hero p {
    font-size: var(--text-xl);
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
    line-height: 1.65;
}

/* Projects filter */
.projects-filter {
    display: flex;
    gap: var(--space-2);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--space-12);
    margin-top: var(--space-8);
}

.filter-btn {
    padding: var(--space-2) var(--space-5);
    border-radius: 100px;
    border: 1px solid var(--border-mid);
    background: transparent;
    color: var(--text-muted);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--dur-fast) var(--ease-smooth);
    font-family: inherit;
}

.filter-btn:hover {
    border-color: var(--clr-brand-500);
    color: var(--clr-brand-500);
    background: rgba(99,102,241,0.06);
}

.filter-btn.active {
    background: var(--clr-brand-500);
    border-color: var(--clr-brand-500);
    color: white;
}

.projects-content { max-width: 1100px; margin: 0 auto; }

.featured-projects,
.research-projects,
.demo-projects,
.academic-projects {
    margin-bottom: var(--space-16);
}

.featured-projects h2,
.research-projects h2,
.demo-projects h2,
.academic-projects h2 {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--text);
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--border);
    letter-spacing: var(--tracking-snug);
}

/* Project Card */
.project-card,
.featured-project {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: transform var(--dur-normal) var(--ease-spring),
                box-shadow var(--dur-normal),
                border-color var(--dur-normal);
    position: relative;
}

@media (prefers-color-scheme: dark) {
    .project-card, .featured-project { background: var(--bg-elevated); }
}

.project-card::before,
.featured-project::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--gradient-brand);
    opacity: 0;
    transition: opacity var(--dur-normal);
}

.project-card:hover::before,
.featured-project::before { opacity: 1; }
.project-card:hover,
.featured-project:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(99,102,241,0.28);
}

.project-card.featured,
.featured-project {
    border-color: rgba(99,102,241,0.28);
    box-shadow: var(--shadow);
}

.project-card.featured::before,
.featured-project::before { opacity: 1; }

/* Inside project cards */
.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-3);
    flex-wrap: wrap;
    padding: var(--space-6) var(--space-6) 0;
    margin-bottom: var(--space-3);
}

.project-header h3 {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text);
    margin: 0;
    flex: 1;
    letter-spacing: var(--tracking-snug);
}

/* Project badges */
.project-badge,
.project-chip {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    border-radius: 100px;
    font-size: var(--text-xs);
    font-weight: 700;
    white-space: nowrap;
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
}

.project-badge { background: var(--clr-brand-500); color: white; }
.project-badge.award    { background: var(--clr-amber); }
.project-badge.research { background: var(--clr-emerald); }
.project-badge.demo     { background: var(--clr-violet); }
.project-badge.thesis   { background: var(--clr-amber); }
.project-badge.sdk      { background: #ef4444; }
.project-badge.winner   { background: var(--clr-cyan); }
.project-badge.iot      { background: #84cc16; }
.project-badge.opensource { background: #6366f1; }

/* Colored pill variants */
.project-chip--award   { background: rgba(245,158,11,0.12); color: #d97706; border: 1px solid rgba(245,158,11,0.28); }
.project-chip--default { background: rgba(99,102,241,0.10); color: var(--clr-brand-500); border: 1px solid rgba(99,102,241,0.22); }
.project-chip--winner  { background: rgba(6,182,212,0.12); color: #0e7490; border: 1px solid rgba(6,182,212,0.25); }
.project-chip--iot     { background: rgba(16,185,129,0.12); color: #047857; border: 1px solid rgba(16,185,129,0.25); }
.project-chip--research{ background: rgba(16,185,129,0.12); color: #047857; border: 1px solid rgba(16,185,129,0.25); }
.project-chip--demo    { background: rgba(139,92,246,0.12); color: var(--clr-violet); border: 1px solid rgba(139,92,246,0.22); }
.project-chip--thesis  { background: rgba(245,158,11,0.10); color: #b45309; border: 1px solid rgba(245,158,11,0.22); }
.project-chip--sdk     { background: rgba(239,68,68,0.10); color: #dc2626; border: 1px solid rgba(239,68,68,0.22); }
.project-chip--opensource { background: rgba(99,102,241,0.10); color: var(--clr-brand-500); border: 1px solid rgba(99,102,241,0.22); }

.project-tech {
    color: var(--clr-amber);
    font-weight: 600;
    font-size: var(--text-xs);
    margin-bottom: var(--space-3);
    font-family: 'Monaco', 'Menlo', ui-monospace, monospace;
    letter-spacing: 0.03em;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
}

.project-description {
    color: var(--text-muted);
    line-height: 1.65;
    font-size: var(--text-sm);
    padding-left: var(--space-6);
    padding-right: var(--space-6);
    margin-bottom: var(--space-4);
}

/* Tech chips row */
.project-tech-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    padding-left: var(--space-6);
    padding-right: var(--space-6);
    margin-bottom: var(--space-5);
}

.tech-chip {
    font-size: 0.72rem;
    padding: 3px var(--space-3);
    border-radius: 100px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    color: var(--text-faint);
    font-family: 'Monaco', 'Menlo', ui-monospace, monospace;
    transition: background var(--dur-fast), color var(--dur-fast);
}

.tech-chip:hover {
    background: rgba(99,102,241,0.08);
    color: var(--clr-brand-400);
}

/* Project links */
.project-links {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--border);
    margin-top: var(--space-2);
}

.project-link,
.project-link-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--clr-brand-500);
    text-decoration: none;
    padding: var(--space-2) var(--space-4);
    border: 1px solid rgba(99,102,241,0.25);
    border-radius: 100px;
    background: rgba(99,102,241,0.06);
    transition: background var(--dur-fast), border-color var(--dur-fast),
                transform var(--dur-fast) var(--ease-spring);
    letter-spacing: var(--tracking-wide);
}

.project-link:hover,
.project-link-btn:hover {
    background: rgba(99,102,241,0.14);
    border-color: rgba(99,102,241,0.42);
    transform: translateY(-1px);
    color: var(--clr-brand-500);
    text-decoration: none !important;
}

/* Projects grid */
.projects-grid,
.featured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-5);
    margin-bottom: var(--space-8);
}

.featured-grid {
    grid-template-columns: 1fr;
}

@media (max-width: 768px) {
    .projects-grid { grid-template-columns: 1fr; }
    .project-header { flex-direction: column; align-items: flex-start; }
}


/* ============================================================
   17. FOOTER
   ============================================================ */

.site-footer {
    position: relative;
    overflow: hidden;
    border-top: 1px solid var(--border);
    padding: var(--space-16) 0 var(--space-8);
    background: var(--bg-secondary);
}

@media (prefers-color-scheme: dark) {
    .site-footer { background: var(--bg-elevated); }
}

.footer-aurora {
    position: absolute;
    inset: 0;
    background: var(--gradient-aurora);
    pointer-events: none;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-12);
    margin-bottom: var(--space-12);
    position: relative;
    z-index: 1;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    color: var(--text);
    font-size: var(--text-lg);
    font-weight: 700;
    margin-bottom: var(--space-4);
    transition: color var(--dur-fast);
}

.footer-logo:hover { color: var(--clr-brand-500); }

.footer-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid var(--clr-brand-500);
    object-fit: cover;
}

.footer-tagline {
    font-size: var(--text-sm);
    color: var(--text-muted);
    line-height: 1.65;
    max-width: 280px;
    margin: 0;
}

.footer-links-heading {
    font-size: var(--text-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: var(--tracking-widest);
    color: var(--text-faint);
    margin-bottom: var(--space-4);
}

.footer-links ul {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer-links a {
    font-size: var(--text-sm);
    color: var(--text-muted);
    text-decoration: none;
    transition: color var(--dur-fast);
}

.footer-links a:hover { color: var(--clr-brand-500); }

.footer-social-icons {
    display: flex;
    gap: var(--space-3);
}

.footer-icon-link,
.social-link {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--bg);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 1rem;
    transition: background var(--dur-fast), color var(--dur-fast),
                transform var(--dur-fast) var(--ease-spring),
                border-color var(--dur-fast);
}

.social-link {
    /* override for text links in old footer fallback */
    width: auto;
    height: auto;
    border-radius: 0;
    background: transparent;
    border: none;
    font-size: var(--text-sm);
    font-weight: 500;
}

.footer-icon-link:hover {
    background: rgba(99,102,241,0.10);
    border-color: rgba(99,102,241,0.28);
    color: var(--clr-brand-500);
    transform: translateY(-2px);
}

.footer-bottom {
    padding-top: var(--space-8);
    border-top: 1px solid var(--border);
    text-align: center;
    position: relative;
    z-index: 1;
}

.footer-bottom p {
    font-size: var(--text-xs);
    color: var(--text-faint);
    margin: 0;
}

/* Legacy footer content fallback */
.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-4);
}

.footer-info p { color: var(--text-muted); font-size: var(--text-sm); }

.footer-social { display: flex; gap: var(--space-6); }
.footer-social .social-link { color: var(--text-muted); font-weight: 500; }
.footer-social .social-link:hover { color: var(--clr-brand-500); }

@media (max-width: 768px) {
    .footer-grid { grid-template-columns: 1fr; gap: var(--space-8); }
    .footer-tagline { max-width: none; }
    .footer-content { flex-direction: column; text-align: center; }
    .footer-social { justify-content: center; }
}


/* ============================================================
   18. SCROLL ANIMATIONS
   ============================================================ */

.reveal-on-scroll {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity var(--dur-slower) var(--ease-smooth),
                transform var(--dur-slower) var(--ease-smooth);
}

.reveal-on-scroll.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger delays */
.bento-grid .reveal-on-scroll:nth-child(1) { transition-delay: 0ms; }
.bento-grid .reveal-on-scroll:nth-child(2) { transition-delay: 80ms; }
.bento-grid .reveal-on-scroll:nth-child(3) { transition-delay: 160ms; }

.skills-grid .reveal-on-scroll:nth-child(1) { transition-delay: 0ms; }
.skills-grid .reveal-on-scroll:nth-child(2) { transition-delay: 60ms; }
.skills-grid .reveal-on-scroll:nth-child(3) { transition-delay: 120ms; }

.timeline-item:nth-child(1) { transition-delay: 0ms; }
.timeline-item:nth-child(2) { transition-delay: 80ms; }
.timeline-item:nth-child(3) { transition-delay: 160ms; }
.timeline-item:nth-child(4) { transition-delay: 240ms; }
.timeline-item:nth-child(5) { transition-delay: 320ms; }
.timeline-item:nth-child(6) { transition-delay: 400ms; }

.awards-grid .reveal-on-scroll:nth-child(1) { transition-delay: 0ms; }
.awards-grid .reveal-on-scroll:nth-child(2) { transition-delay: 80ms; }
.awards-grid .reveal-on-scroll:nth-child(3) { transition-delay: 160ms; }
.awards-grid .reveal-on-scroll:nth-child(4) { transition-delay: 240ms; }

@media (prefers-reduced-motion: reduce) {
    .reveal-on-scroll {
        opacity: 1;
        transform: none;
        transition: none;
    }
    .hero-eyebrow, .hero-title, .hero-description,
    .hero-actions, .hero-social, .hero-card-cluster {
        animation: none;
        opacity: 1;
        transform: none;
    }
    .avatar-ring-wrap::before { animation: none; }
    .hero-status-dot { animation: none; }
    .scroll-line { animation: none; }
    .hero-avatar-card,
    .hero-stat-card { animation: none; }
}


/* ============================================================
   19. RESPONSIVE
   ============================================================ */

@media (max-width: 768px) {
    .container { padding: 0 var(--space-4); }
    .content-wrapper { padding: 0 0 var(--space-10); }

    h1 { font-size: var(--text-3xl); }
    h2 { font-size: var(--text-2xl); }

    .section-title { font-size: var(--text-3xl); }
    .about-section h2, .experience-section h2, .skills-section h2,
    .education-section h2, .awards-section h2, .interests-section h2 {
        font-size: var(--text-2xl);
    }

    .timeline-item { grid-template-columns: 24px 1fr; gap: var(--space-3); }
    .timeline-card { padding: var(--space-4); }

    .project-header { padding: var(--space-4) var(--space-4) 0; }
    .project-tech { padding-left: var(--space-4); padding-right: var(--space-4); }
    .project-description { padding-left: var(--space-4); padding-right: var(--space-4); }
    .project-tech-chips { padding-left: var(--space-4); padding-right: var(--space-4); }
    .project-links { padding: var(--space-3) var(--space-4); }
}

@media (max-width: 480px) {
    .hero-section { padding-top: var(--space-12); padding-bottom: var(--space-8); }
    .bento-card { padding: var(--space-5); }
    .awards-grid { grid-template-columns: 1fr; }

    .projects-hero {
        padding: var(--space-12) var(--space-4) var(--space-8);
        margin-left: calc(-1 * var(--space-4));
        margin-right: calc(-1 * var(--space-4));
    }
    .about-hero {
        padding: var(--space-12) var(--space-4) var(--space-8);
        margin-left: calc(-1 * var(--space-4));
        margin-right: calc(-1 * var(--space-4));
    }
}