/* ============================================
   Bo Ti — Personal Portfolio
   Aesthetic: Technical Precision
   Subtle embedded/EE nod via grid patterns,
   monospace accents, and sky-blue tones
   ============================================ */

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

:root {
    --bg-deep: #0a0e17;
    --bg-surface: #0f1520;
    --bg-card: #141c2b;
    --bg-elevated: #1a2435;

    --accent: #38bdf8;
    --accent-dim: rgba(56, 189, 248, 0.12);
    --accent-hover: #7dd3fc;
    --accent-secondary: #f0a030;
    --accent-secondary-dim: rgba(240, 160, 48, 0.12);

    --text-primary: #e4e8ef;
    --text-secondary: #7b8ba3;
    --text-muted: #4a5568;

    --border: #1e2a3a;
    --border-light: rgba(255, 255, 255, 0.06);

    --font-display: 'Space Mono', 'Courier New', monospace;
    --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;

    --nav-height: 64px;
    --container-max: 1100px;

    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ---- LIGHT MODE VARIABLE OVERRIDES ---- */
[data-theme="light"] {
    --bg-deep: #f5f6fa;
    --bg-surface: #eceef4;
    --bg-card: #ffffff;
    --bg-elevated: #f0f1f5;

    --accent: #0e8fd0;
    --accent-dim: rgba(14, 143, 208, 0.1);
    --accent-hover: #0a7ab8;
    --accent-secondary: #d08a18;
    --accent-secondary-dim: rgba(208, 138, 24, 0.1);

    --text-primary: #1a1e2e;
    --text-secondary: #4a5568;
    --text-muted: #8896a8;

    --border: #d8dce6;
    --border-light: rgba(0, 0, 0, 0.06);
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font-body);
    background: var(--bg-deep);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

/* Noise/grain texture overlay for depth */
body::after {
    content: '';
    position: fixed;
    inset: 0;
    z-index: 9999;
    pointer-events: none;
    opacity: 0.028;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 180px;
}

/* Background grid canvas */
#gridCanvas {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    opacity: 0.35;
}

/* ---- CONTAINER ---- */
.container {
    max-width: var(--container-max);
    width: 100%;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ---- NAVBAR ---- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    z-index: 100;
    background: rgba(10, 14, 23, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    transition: background 0.3s, box-shadow 0.3s;
}

.navbar.scrolled {
    background: rgba(10, 14, 23, 0.95);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.nav-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
    transition: color 0.2s, text-shadow 0.3s;
}

.nav-logo:hover {
    color: var(--accent);
    text-shadow: 0 0 12px rgba(56, 189, 248, 0.3);
}

.logo-bracket {
    color: var(--accent);
    font-weight: 400;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-family: var(--font-display);
    font-size: 0.78rem;
    color: var(--text-secondary);
    text-decoration: none;
    letter-spacing: 0.03em;
    transition: color 0.25s;
    position: relative;
    padding-bottom: 4px;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s var(--ease-out-expo);
    border-radius: 1px;
}

.nav-links a:hover {
    color: var(--accent);
}

.nav-links a:hover::after {
    width: 100%;
}

/* Active nav link */
.nav-links a.active {
    color: var(--accent);
}

.nav-links a.active::after {
    width: 100%;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.lang-toggle {
    font-family: var(--font-display);
    font-size: 0.72rem;
    background: var(--accent-dim);
    color: var(--accent);
    border: 1px solid rgba(56, 189, 248, 0.25);
    padding: 0.3rem 0.75rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.25s;
    letter-spacing: 0.06em;
    font-weight: 700;
}

.lang-toggle:hover {
    background: rgba(56, 189, 248, 0.2);
    border-color: var(--accent);
    box-shadow: 0 0 10px rgba(56, 189, 248, 0.15);
}

.lang-toggle:active {
    transform: scale(0.95);
}

/* Hamburger */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.menu-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-secondary);
    transition: all 0.3s;
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ---- HERO ---- */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: calc(var(--nav-height) + 3rem) 2rem 2rem;
    position: relative;
    z-index: 1;
    background: url('bg.png') center center / cover no-repeat fixed;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        180deg,
        rgba(10, 14, 23, 0.35) 0%,
        rgba(10, 14, 23, 0.12) 40%,
        rgba(10, 14, 23, 0.55) 100%
    );
    z-index: 0;
}

.hero-content-wrapper {
    position: relative;
    z-index: 1;
    max-width: var(--container-max);
    width: 100%;
    margin: 0 auto;
    display: flex;
    align-items: stretch;
    gap: 1.5rem;
}

/* Glassmorphism card */
.glass-card {
    background: rgba(14, 20, 33, 0.45);
    backdrop-filter: blur(20px) saturate(1.3);
    -webkit-backdrop-filter: blur(20px) saturate(1.3);
    border: 1px solid rgba(56, 189, 248, 0.15);
    border-radius: 20px;
    padding: 3rem 3.5rem;
    flex: 1 1 0;
    min-width: 0;
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
    transition: border-color 0.4s, box-shadow 0.4s;
    /* Page load animation */
    opacity: 0;
    transform: translateY(24px);
    animation: hero-card-in 0.9s var(--ease-out-expo) forwards;
    animation-delay: 0.2s;
}

.glass-card:hover {
    border-color: rgba(56, 189, 248, 0.3);
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.4),
        0 0 30px rgba(56, 189, 248, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

@keyframes hero-card-in {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Signal waveform glass card */
.glass-card-signal {
    flex: 0 0 340px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 1.5rem;
    animation-delay: 0.45s;
}

.signal-display {
    position: relative;
    width: 100%;
    overflow: hidden;
    border-radius: 8px;
}

.signal-display::before {
    content: '';
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 19px,
        rgba(56, 189, 248, 0.04) 19px,
        rgba(56, 189, 248, 0.04) 20px
    ),
    repeating-linear-gradient(
        90deg,
        transparent,
        transparent 19px,
        rgba(56, 189, 248, 0.04) 19px,
        rgba(56, 189, 248, 0.04) 20px
    );
    pointer-events: none;
    z-index: 1;
}

#signalCanvas {
    width: 100%;
    display: block;
    border-radius: 8px;
}

.signal-label {
    font-family: var(--font-display);
    font-size: 0.7rem;
    color: var(--accent);
    margin-top: 0.75rem;
    letter-spacing: 0.08em;
    opacity: 0.8;
}

.blink {
    animation: blink-cursor 1.5s step-end infinite;
}

.hero-greeting {
    font-family: var(--font-display);
    font-size: 0.88rem;
    color: var(--accent);
    margin-bottom: 0.75rem;
    letter-spacing: 0.06em;
    opacity: 0;
    animation: fade-up 0.6s var(--ease-out-expo) 0.5s forwards;
}

.hero-name {
    font-family: var(--font-display);
    font-size: clamp(2.8rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.05;
    color: #ffffff;
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 24px rgba(56, 189, 248, 0.2);
    opacity: 0;
    animation: fade-up 0.7s var(--ease-out-expo) 0.65s forwards;
}

.cursor {
    color: var(--accent);
    animation: blink-cursor 1s step-end infinite;
}

@keyframes blink-cursor {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

@keyframes fade-up {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-family: var(--font-body);
    font-size: 1.3rem;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 1.5rem;
    letter-spacing: 0.01em;
    opacity: 0;
    animation: fade-up 0.6s var(--ease-out-expo) 0.8s forwards;
}

.hero-bio {
    color: rgba(255, 255, 255, 0.58);
    font-size: 0.98rem;
    max-width: 540px;
    margin-bottom: 2rem;
    line-height: 1.85;
    opacity: 0;
    animation: fade-up 0.6s var(--ease-out-expo) 0.9s forwards;
}

.hero-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    opacity: 0;
    animation: fade-up 0.6s var(--ease-out-expo) 1.05s forwards;
}

.hero .btn-ghost {
    border-color: rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.7);
}

.hero .btn-ghost:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* Scroll hint */
.scroll-hint {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-family: var(--font-display);
    font-size: 0.62rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    z-index: 2;
    opacity: 0;
    animation: fade-up 0.5s var(--ease-out-expo) 1.4s forwards;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--text-muted), transparent);
    animation: scroll-pulse 2s ease-in-out infinite;
}

@keyframes scroll-pulse {
    0%, 100% { opacity: 0.3; transform: scaleY(1); }
    50% { opacity: 1; transform: scaleY(1.3); }
}

/* ---- BUTTONS ---- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.7rem 1.6rem;
    font-family: var(--font-display);
    font-size: 0.78rem;
    font-weight: 700;
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.25s var(--ease-out-expo);
    letter-spacing: 0.03em;
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), #60c9f8);
    color: var(--bg-deep);
}

.btn-primary:hover {
    box-shadow: 0 4px 20px rgba(56, 189, 248, 0.35);
    transform: translateY(-2px);
}

.btn-primary:active {
    transform: translateY(0) scale(0.97);
    box-shadow: 0 2px 8px rgba(56, 189, 248, 0.2);
}

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

.btn-ghost:hover {
    color: var(--accent);
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(56, 189, 248, 0.1);
}

.btn-ghost:active {
    transform: translateY(0) scale(0.97);
}

.btn-lg {
    padding: 0.9rem 2.5rem;
    font-size: 0.82rem;
}

/* ---- SECTIONS ---- */
.section {
    padding: 6rem 0;
    position: relative;
    z-index: 1;
}

.section-alt {
    background: var(--bg-surface);
}

.section-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 3rem;
}

.section-index {
    font-family: var(--font-display);
    font-size: 1rem;
    color: var(--accent-secondary);
    font-weight: 700;
    opacity: 0.9;
    text-shadow: 0 0 16px rgba(240, 160, 48, 0.2);
    min-width: 2ch;
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    white-space: nowrap;
    letter-spacing: -0.01em;
}

.section-line {
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, var(--border), transparent);
}

/* ---- ABOUT ---- */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.about-text p {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 1.25rem;
    line-height: 1.85;
}

/* Terminal card */
.terminal-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.terminal-card:hover {
    border-color: rgba(56, 189, 248, 0.2);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.terminal-header {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 0.75rem 1rem;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
}

.terminal-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--text-muted);
}

.terminal-dot:nth-child(1) { background: #ff5f57; }
.terminal-dot:nth-child(2) { background: #ffbd2e; }
.terminal-dot:nth-child(3) { background: #28c840; }

.terminal-title {
    font-family: var(--font-display);
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-left: 0.5rem;
}

.terminal-body {
    padding: 1.25rem;
}

.terminal-body code {
    font-family: var(--font-display);
    font-size: 0.76rem;
    line-height: 1.9;
    white-space: pre;
    display: block;
}

/* Terminal typing animation — lines appear one by one */
.terminal-body code > span {
    opacity: 0;
    animation: terminal-line-in 0.3s var(--ease-out-expo) forwards;
}

.terminal-body code > span:nth-child(1)  { animation-delay: 0.3s; }
.terminal-body code > span:nth-child(2)  { animation-delay: 0.5s; }
.terminal-body code > span:nth-child(3)  { animation-delay: 0.7s; }
.terminal-body code > span:nth-child(4)  { animation-delay: 0.9s; }
.terminal-body code > span:nth-child(5)  { animation-delay: 1.1s; }
.terminal-body code > span:nth-child(6)  { animation-delay: 1.3s; }
.terminal-body code > span:nth-child(7)  { animation-delay: 1.4s; }
.terminal-body code > span:nth-child(8)  { animation-delay: 1.5s; }
.terminal-body code > span:nth-child(9)  { animation-delay: 1.6s; }
.terminal-body code > span:nth-child(10) { animation-delay: 1.8s; }
.terminal-body code > span:nth-child(11) { animation-delay: 2.0s; }
.terminal-body code > span:nth-child(12) { animation-delay: 2.2s; }
.terminal-body code > span:nth-child(13) { animation-delay: 2.4s; }
.terminal-body code > span:nth-child(14) { animation-delay: 2.6s; }

/* Only animate when visible */
.terminal-card.terminal-animate .terminal-body code > span {
    opacity: 0;
}

@keyframes terminal-line-in {
    from { opacity: 0; transform: translateX(-4px); }
    to   { opacity: 1; transform: translateX(0); }
}

.t-prompt {
    color: var(--accent);
    user-select: none;
}

.t-cmd {
    color: var(--text-primary);
}

.t-output {
    color: var(--text-secondary);
}

/* ---- PROJECTS ---- */
.projects-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.project-card {
    display: block;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    text-decoration: none;
    color: inherit;
    transition: all 0.35s var(--ease-out-expo);
    position: relative;
}

.project-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(to bottom, var(--accent), var(--accent-secondary));
    border-radius: 12px 0 0 12px;
    opacity: 0;
    transition: opacity 0.35s;
}

.project-card:hover {
    border-color: rgba(56, 189, 248, 0.25);
    transform: translateY(-4px);
    box-shadow:
        0 12px 40px rgba(0, 0, 0, 0.3),
        0 0 20px rgba(56, 189, 248, 0.06);
}

.project-card:hover::before {
    opacity: 1;
}

.project-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.project-label {
    font-family: var(--font-display);
    font-size: 0.68rem;
    color: var(--accent-secondary);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.project-arrow {
    color: var(--text-muted);
    transition: all 0.3s var(--ease-out-expo);
}

.project-card:hover .project-arrow {
    color: var(--accent);
    transform: translate(3px, -3px);
}

.project-name {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    letter-spacing: -0.01em;
    transition: color 0.3s;
}

.project-card:hover .project-name {
    color: #ffffff;
}

.project-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.78;
    margin-bottom: 1.25rem;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.project-tech span {
    font-family: var(--font-display);
    font-size: 0.68rem;
    color: var(--accent);
    background: var(--accent-dim);
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    letter-spacing: 0.02em;
    transition: all 0.2s;
}

.project-tech span:hover {
    background: rgba(56, 189, 248, 0.2);
    transform: translateY(-1px);
}

/* ---- SKILLS ---- */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.skill-block {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.5rem;
    transition: all 0.35s var(--ease-out-expo);
}

.skill-block:hover {
    border-color: rgba(56, 189, 248, 0.25);
    transform: translateY(-3px);
    box-shadow:
        0 8px 24px rgba(0, 0, 0, 0.2),
        0 0 16px rgba(56, 189, 248, 0.05);
}

.skill-cat {
    font-family: var(--font-display);
    font-size: 0.76rem;
    color: var(--accent);
    margin-bottom: 0.75rem;
    letter-spacing: 0.04em;
    font-weight: 700;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.skill-tags span {
    font-size: 0.84rem;
    color: var(--text-secondary);
    background: var(--bg-elevated);
    padding: 0.3rem 0.7rem;
    border-radius: 4px;
    border: 1px solid var(--border-light);
    transition: all 0.25s var(--ease-out-expo);
    cursor: default;
}

.skill-tags span:hover {
    color: var(--text-primary);
    border-color: rgba(56, 189, 248, 0.25);
    background: rgba(56, 189, 248, 0.06);
    transform: translateY(-1px);
}

/* ---- EXPERIENCE ---- */
.experience-list {
    position: relative;
    padding-left: 2rem;
}

.experience-list::before {
    content: '';
    position: absolute;
    left: 5px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(to bottom, var(--accent), var(--accent-secondary) 60%, var(--border));
}

.exp-card {
    position: relative;
    margin-bottom: 2.5rem;
}

.exp-card:last-child {
    margin-bottom: 0;
}

.exp-timeline-dot {
    position: absolute;
    left: -2rem;
    top: 0.15rem;
    width: 11px;
    height: 11px;
    background: var(--accent);
    border: 2px solid var(--accent);
    border-radius: 50%;
    transform: translateX(-0.5px);
    box-shadow: 0 0 10px rgba(56, 189, 248, 0.4);
    animation: dot-glow 2.5s ease-in-out infinite;
}

@keyframes dot-glow {
    0%, 100% { box-shadow: 0 0 8px rgba(56, 189, 248, 0.3); }
    50% { box-shadow: 0 0 18px rgba(56, 189, 248, 0.6), 0 0 4px rgba(56, 189, 248, 0.8); }
}

.exp-period {
    font-family: var(--font-display);
    font-size: 0.73rem;
    color: var(--accent-secondary);
    margin-bottom: 0.35rem;
    letter-spacing: 0.05em;
    font-weight: 700;
}

.exp-role {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    letter-spacing: -0.01em;
}

.exp-company {
    font-family: var(--font-display);
    font-size: 0.8rem;
    color: var(--accent);
    font-weight: 700;
    display: inline-block;
    margin-bottom: 0.5rem;
}

.exp-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.78;
}

/* ---- CONTACT ---- */
.contact-box {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.contact-text {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 2rem;
    line-height: 1.85;
}

/* ---- FOOTER ---- */
.footer {
    border-top: 1px solid var(--border);
    padding: 2rem 0;
    position: relative;
    z-index: 1;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.8rem;
}

.footer-sub {
    font-size: 0.75rem;
    opacity: 0.6;
}

/* ---- SMOOTH THEME TRANSITION ---- */
body,
.navbar,
.section,
.section-alt,
.glass-card,
.terminal-card,
.terminal-header,
.project-card,
.footer,
.btn-ghost,
.exp-card,
.contact-box {
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

/* ---- THEME TOGGLE BUTTON ---- */
.theme-toggle {
    font-family: var(--font-display);
    font-size: 0.88rem;
    background: var(--accent-dim);
    color: var(--accent);
    border: 1px solid rgba(56, 189, 248, 0.25);
    padding: 0.3rem 0.65rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.25s;
    letter-spacing: 0.06em;
    font-weight: 700;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

[data-theme="light"] .theme-toggle {
    border-color: rgba(14, 143, 208, 0.3);
}

.theme-toggle:hover {
    background: rgba(56, 189, 248, 0.2);
    border-color: var(--accent);
    box-shadow: 0 0 10px rgba(56, 189, 248, 0.15);
}

[data-theme="light"] .theme-toggle:hover {
    background: rgba(14, 143, 208, 0.15);
    box-shadow: 0 0 10px rgba(14, 143, 208, 0.15);
}

.theme-toggle:active {
    transform: scale(0.95);
}

/* ---- LIGHT MODE COMPONENT OVERRIDES ---- */
[data-theme="light"] body::after {
    opacity: 0.015;
}

[data-theme="light"] #gridCanvas {
    opacity: 0.2;
}

[data-theme="light"] .navbar {
    background: rgba(245, 246, 250, 0.88);
    border-bottom-color: var(--border);
}

[data-theme="light"] .navbar.scrolled {
    background: rgba(245, 246, 250, 0.96);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .hero::before {
    background: linear-gradient(
        180deg,
        rgba(245, 246, 250, 0.55) 0%,
        rgba(245, 246, 250, 0.25) 40%,
        rgba(245, 246, 250, 0.7) 100%
    );
}

[data-theme="light"] .glass-card {
    background: rgba(255, 255, 255, 0.6);
    border-color: rgba(14, 143, 208, 0.15);
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

[data-theme="light"] .glass-card:hover {
    border-color: rgba(14, 143, 208, 0.3);
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.1),
        0 0 30px rgba(14, 143, 208, 0.06),
        inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

[data-theme="light"] .hero-name {
    color: #1a1e2e;
    text-shadow: 0 2px 24px rgba(14, 143, 208, 0.12);
}

[data-theme="light"] .hero-title {
    color: rgba(26, 30, 46, 0.65);
}

[data-theme="light"] .hero-bio {
    color: rgba(26, 30, 46, 0.55);
}

[data-theme="light"] .hero .btn-ghost {
    border-color: rgba(26, 30, 46, 0.2);
    color: rgba(26, 30, 46, 0.6);
}

[data-theme="light"] .hero .btn-ghost:hover {
    border-color: var(--accent);
    color: var(--accent);
}

[data-theme="light"] .terminal-card {
    background: var(--bg-card);
    border-color: var(--border);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .terminal-header {
    background: var(--bg-elevated);
    border-bottom-color: var(--border);
}

[data-theme="light"] .project-card {
    background: var(--bg-card);
    border-color: var(--border);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

[data-theme="light"] .project-card:hover {
    border-color: rgba(14, 143, 208, 0.3);
    box-shadow:
        0 12px 40px rgba(0, 0, 0, 0.08),
        0 0 20px rgba(14, 143, 208, 0.05);
}

[data-theme="light"] .project-card:hover .project-name {
    color: #0e8fd0;
}

[data-theme="light"] .section-line {
    background: linear-gradient(90deg, var(--border), transparent);
}

[data-theme="light"] .experience-list::before {
    background: linear-gradient(to bottom, var(--accent), var(--accent-secondary) 60%, var(--border));
}

[data-theme="light"] .exp-timeline-dot {
    box-shadow: 0 0 10px rgba(14, 143, 208, 0.3);
}

[data-theme="light"] .nav-links {
    /* mobile dropdown override */
}

[data-theme="light"] .footer {
    border-top-color: var(--border);
}

[data-theme="light"] .btn-primary {
    background: linear-gradient(135deg, #0e8fd0, #3bb8e8);
    color: #ffffff;
}

[data-theme="light"] .btn-primary:hover {
    box-shadow: 0 4px 20px rgba(14, 143, 208, 0.3);
}

/* ---- SCROLL REVEAL ---- */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.75s var(--ease-out-expo),
                transform 0.75s var(--ease-out-expo);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Slide-in from left variant */
.reveal-left {
    opacity: 0;
    transform: translateX(-28px);
    transition: opacity 0.75s var(--ease-out-expo),
                transform 0.75s var(--ease-out-expo);
}

.reveal-left.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Slide-in from right variant */
.reveal-right {
    opacity: 0;
    transform: translateX(28px);
    transition: opacity 0.75s var(--ease-out-expo),
                transform 0.75s var(--ease-out-expo);
}

.reveal-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* ---- RESPONSIVE: TABLET ---- */
@media (max-width: 900px) {
    .glass-card-signal {
        display: none;
    }

    .hero-content-wrapper {
        justify-content: center;
    }

    .glass-card {
        max-width: 680px;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .skills-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    }

    .glass-card {
        padding: 2.5rem 2rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: rgba(10, 14, 23, 0.98);
        backdrop-filter: blur(16px);
        flex-direction: column;
        padding: 1.5rem 2rem;
        gap: 1.25rem;
        border-bottom: 1px solid var(--border);
    }

    [data-theme="light"] .nav-links {
        background: rgba(245, 246, 250, 0.98);
    }

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

    .menu-toggle {
        display: flex;
    }

    .hero {
        padding-top: calc(var(--nav-height) + 2rem);
        min-height: auto;
    }

    .hero-name {
        font-size: 2.5rem;
    }

    .glass-card {
        padding: 2rem 1.5rem;
    }

    .section {
        padding: 4rem 0;
    }

    .section-header {
        margin-bottom: 2rem;
    }

    .container {
        padding: 0 1.25rem;
    }

    .project-card {
        padding: 1.5rem;
    }

    .project-name {
        font-size: 1.15rem;
    }

    .footer-inner {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: calc(var(--nav-height) + 1rem) 1rem 3rem;
    }

    .hero-name {
        font-size: 2rem;
    }

    .hero-title {
        font-size: 1.1rem;
    }

    .hero-bio {
        font-size: 0.9rem;
    }

    .hero-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .container {
        padding: 0 0.75rem;
    }

    .section {
        padding: 3rem 0;
    }

    .section-title {
        font-size: 1.2rem;
    }

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

    .scroll-hint {
        display: none;
    }
}