/* ================================
   nulloxide
   ================================ */

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

:root {
    /* Dark theme (default) */
    --void: #08080a;
    --surface: #0f0f12;
    --text: #e4e4e8;
    --dim: #4a4a58;
    --accent: #00ff9d;
    --accent-dim: rgba(0, 255, 157, 0.15);
    --rust: #ff6b35;
    --glow-opacity: 1;
    --noise-opacity: 0.04;
    --terminal-bg: rgba(0, 255, 157, 0.02);
    --terminal-border: rgba(0, 255, 157, 0.1);
    --input-bg: var(--void);
    --input-border: rgba(255, 255, 255, 0.1);
    --canvas-fade: rgba(8, 8, 10, 0.12);

    --font-mono: 'JetBrains Mono', monospace;
    --font-sans: 'Inter', sans-serif;

    --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* Light theme */
[data-theme="light"] {
    --void: #f5f5f7;
    --surface: #ffffff;
    --text: #1a1a1c;
    --dim: #6b6b78;
    --accent: #00a86b;
    --accent-dim: rgba(0, 168, 107, 0.12);
    --rust: #d94f1a;
    --glow-opacity: 0.5;
    --noise-opacity: 0.02;
    --terminal-bg: rgba(0, 0, 0, 0.03);
    --terminal-border: rgba(0, 0, 0, 0.1);
    --input-bg: #ffffff;
    --input-border: rgba(0, 0, 0, 0.12);
    --canvas-fade: rgba(245, 245, 247, 0.15);
}

/* System preference - light mode (when no manual override) */
@media (prefers-color-scheme: light) {
    :root:not([data-theme="dark"]) {
        --void: #f5f5f7;
        --surface: #ffffff;
        --text: #1a1a1c;
        --dim: #6b6b78;
        --accent: #00a86b;
        --accent-dim: rgba(0, 168, 107, 0.12);
        --rust: #d94f1a;
        --glow-opacity: 0.5;
        --noise-opacity: 0.02;
        --terminal-bg: rgba(0, 0, 0, 0.03);
        --terminal-border: rgba(0, 0, 0, 0.1);
        --input-bg: #ffffff;
        --input-border: rgba(0, 0, 0, 0.12);
        --canvas-fade: rgba(245, 245, 247, 0.15);
    }
}

::selection {
    background: var(--accent);
    color: var(--void);
}

/* Holographic/Iridescent shimmer */
@keyframes holographicShimmer {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.holographic {
    background: linear-gradient(
        135deg,
        var(--accent) 0%,
        #00d4ff 25%,
        var(--accent) 50%,
        #ff00ff 75%,
        var(--accent) 100%
    );
    background-size: 400% 400%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: holographicShimmer 8s ease infinite;
}

/* Tinted glass effect */
.tinted-glass {
    background: rgba(0, 255, 157, 0.03);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(0, 255, 157, 0.08);
}

html {
    font-size: 16px;
    /* iOS safe areas */
    padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

body {
    font-family: var(--font-sans);
    background: var(--void);
    color: var(--text);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    /* iOS fixes */
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
}

/* ================================
   Scroll Progress Indicator
   ================================ */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), #00d4ff);
    width: 0%;
    z-index: 9999;
    transition: width 0.1s linear;
    box-shadow: 0 0 10px var(--accent);
}

/* ================================
   Background
   ================================ */
#void {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
}

.noise {
    position: fixed;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    opacity: var(--noise-opacity);
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

#content {
    position: relative;
    z-index: 2;
}

/* ================================
   Sections
   ================================ */
.section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10vh 8vw;
}

/* ================================
   Hero - nulloxide meaning
   ================================ */
.hero-block {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.null-meaning, .oxide-meaning {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
}

.symbol {
    font-size: 3rem;
    color: var(--accent);
    opacity: 0;
    animation: fadeIn 1s var(--ease) 0.2s forwards;
}

.word {
    font-family: var(--font-mono);
    font-size: clamp(3rem, 12vw, 8rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    opacity: 1;
    display: inline-block;
    perspective: 500px;
    cursor: default;
    transition: transform 0.15s ease-out;
    transform-style: preserve-3d;
}

/* Kinetic letter spans */
.word .letter {
    display: inline-block;
    transition: transform 0.4s var(--ease), text-shadow 0.3s, filter 0.3s;
    will-change: transform;
    transform-style: preserve-3d;
}

/* 3D tilt on hover */
.word:hover .letter {
    animation: letterFloat 2s ease-in-out infinite;
}

.word .letter:nth-child(odd) { animation-delay: 0s; }
.word .letter:nth-child(even) { animation-delay: 0.15s; }

@keyframes letterFloat {
    0%, 100% { transform: translateY(0) rotateX(0); }
    50% { transform: translateY(-6px) rotateX(10deg); }
}

/* Active letter - when mouse is directly over */
.word .letter.active {
    transform: translateY(-12px) scale(1.15) rotateY(15deg);
    filter: brightness(1.3);
    z-index: 10;
    position: relative;
}

/* Scramble effect - letters during decode */
.word .letter.scrambling {
    opacity: 0.7;
    filter: blur(1px);
}

/* Glitch effect */
.word .letter.glitch {
    animation: letterGlitch 0.15s steps(2) forwards;
}

@keyframes letterGlitch {
    0% { transform: translate(0); filter: none; }
    25% { transform: translate(-2px, 1px); filter: hue-rotate(90deg); }
    50% { transform: translate(2px, -1px); filter: hue-rotate(-90deg); }
    75% { transform: translate(-1px, -1px); filter: hue-rotate(180deg); }
    100% { transform: translate(0); filter: none; }
}

/* Gradient flow through letters */
.null-meaning .word .letter {
    color: var(--accent);
    text-shadow: 0 0 20px rgba(0, 255, 157, 0.3);
}

.null-meaning .word .letter.active {
    text-shadow: 0 0 40px rgba(0, 255, 157, 0.8), 0 0 80px rgba(0, 255, 157, 0.4);
}

.null-meaning .word .letter.gradient-flow {
    animation: gradientPulse 0.6s ease forwards;
}

@keyframes gradientPulse {
    0% { color: var(--accent); text-shadow: 0 0 20px rgba(0, 255, 157, 0.3); }
    50% { color: #00d4ff; text-shadow: 0 0 30px rgba(0, 212, 255, 0.5); }
    100% { color: var(--accent); text-shadow: 0 0 20px rgba(0, 255, 157, 0.3); }
}

.oxide-meaning .word .letter {
    color: var(--rust);
    text-shadow: 0 0 20px rgba(255, 107, 53, 0.3);
}

.oxide-meaning .word .letter.active {
    text-shadow: 0 0 40px rgba(255, 107, 53, 0.8), 0 0 80px rgba(255, 107, 53, 0.4);
}

.oxide-meaning .word .letter.gradient-flow {
    animation: gradientPulseRust 0.6s ease forwards;
}

@keyframes gradientPulseRust {
    0% { color: var(--rust); text-shadow: 0 0 20px rgba(255, 107, 53, 0.3); }
    50% { color: #ffaa6b; text-shadow: 0 0 30px rgba(255, 170, 107, 0.5); }
    100% { color: var(--rust); text-shadow: 0 0 20px rgba(255, 107, 53, 0.3); }
}

.definition {
    font-size: 0.9rem;
    color: var(--dim);
    letter-spacing: 0.05em;
    opacity: 0;
    animation: fadeIn 1s var(--ease) 0.6s forwards;
}

.oxide-meaning .definition {
    animation-delay: 1s;
}

.plus {
    font-family: var(--font-mono);
    font-size: 2rem;
    color: var(--dim);
    opacity: 0;
    animation: fadeIn 0.5s var(--ease) 0.7s forwards;
}

.hero-sub {
    margin-top: 4rem;
    text-align: center;
    opacity: 0;
    animation: fadeIn 1s var(--ease) 1.2s forwards;
}

.age-line {
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    font-weight: 300;
}

#years {
    font-family: var(--font-mono);
    color: var(--accent);
}

#age-joke {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.9rem;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ================================
   Terminal Journey
   ================================ */
.section--journey {
    min-height: 100vh;
}

.terminal-window {
    width: 100%;
    max-width: 700px;
    background: var(--terminal-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--terminal-border);
    border-radius: 12px;
    overflow: hidden;
    opacity: 0;
    transform: translateY(40px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.terminal-window.visible {
    opacity: 1;
    transform: translateY(0);
    transition: all 1s var(--ease);
}

.terminal-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: rgba(255,255,255,0.02);
    border-bottom: 1px solid rgba(255,255,255,0.04);
}

.terminal-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--dim);
}

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

.terminal-title {
    margin-left: auto;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--dim);
}

.terminal-body {
    padding: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.8;
    min-height: 300px;
}

.terminal-line {
    opacity: 0;
    transform: translateX(-10px);
}

.terminal-line.typed {
    opacity: 1;
    transform: translateX(0);
    transition: all 0.3s var(--ease);
}

.prompt {
    color: var(--accent);
    margin-right: 0.5rem;
}

.cmd { color: var(--text); }
.comment { color: var(--dim); font-style: italic; }
.output { color: var(--dim); padding-left: 1rem; }
.highlight { color: var(--accent); }
.error { color: var(--rust); }

/* ================================
   Philosophy Section (Depth + Balance)
   ================================ */
.section--philosophy {
    min-height: 80vh;
    padding: 8vh 6vw;
}

.philosophy-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    max-width: 1200px;
    width: 100%;
}

.depth-visual {
    position: relative;
    width: 250px;
    height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
    justify-self: center;
}

.layer {
    position: absolute;
    border: 1px solid var(--accent);
    border-radius: 50%;
    opacity: 0;
}

.layer-1 { width: 100%; height: 100%; opacity: 0.1; animation: layerPulse 4s ease-in-out infinite; }
.layer-2 { width: 75%; height: 75%; opacity: 0.2; animation: layerPulse 4s ease-in-out infinite 0.5s; }
.layer-3 { width: 50%; height: 50%; opacity: 0.4; animation: layerPulse 4s ease-in-out infinite 1s; }
.layer-4 { width: 25%; height: 25%; opacity: 0.8; background: var(--accent-dim); animation: layerPulse 4s ease-in-out infinite 1.5s; }

@keyframes layerPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.03); }
}

.depth-text {
    position: relative;
    z-index: 1;
    text-align: center;
}

.depth-text p {
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    font-weight: 300;
    overflow: hidden;
}

.reveal-word {
    display: inline-block;
    opacity: 0;
    transform: translateY(100%);
    transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

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

.depth-text .accent {
    color: var(--accent);
    font-weight: 500;
    position: relative;
}

/* Glow pulse on "deep" */
.depth-text .accent.visible::after {
    content: 'deep.';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--accent);
    filter: blur(8px);
    opacity: 0;
    animation: deepPulse 3s ease-in-out infinite;
    animation-delay: 1s;
}

@keyframes deepPulse {
    0%, 100% { opacity: 0; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.05); }
}

.balance-visual {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
}

.wave-container {
    width: 100%;
    max-width: 400px;
    height: 100px;
}

#wave {
    width: 100%;
    height: 100%;
}

.balance-text {
    text-align: center;
    font-size: clamp(1rem, 2.5vw, 1.3rem);
    font-weight: 300;
    line-height: 1.6;
    opacity: 0;
}

/* ================================
   Meta Section - Code Comment
   ================================ */
.section--meta {
    min-height: auto;
    padding: 6vh 8vw;
}

.meta-comment {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    font-family: var(--font-mono);
    font-size: clamp(0.85rem, 2vw, 1rem);
}

.comment-line {
    color: var(--dim);
    opacity: 0;
    transform: translateX(-10px);
    transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

.comment-line.visible {
    opacity: 1;
    transform: translateX(0);
}

.comment-line .accent {
    color: var(--accent);
}

/* ================================
   Location
   ================================ */
.section--location {
    min-height: 40vh;
    position: relative;
    overflow: hidden;
}

.location-content {
    position: relative;
    z-index: 1;
    text-align: center;
    font-family: var(--font-mono);
}

.location-prompt {
    font-size: 0.9rem;
    margin-bottom: 1rem;
    opacity: 0;
}

.location-response {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    color: var(--accent);
    min-height: 3rem;
    margin-bottom: 1rem;
}

.cursor-blink {
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.location-coords {
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    opacity: 0;
}

/* ================================
   Work Section
   ================================ */
.section--work {
    min-height: 45vh;
}

.work-content {
    text-align: center;
}

.work-intro {
    font-size: 1rem;
    margin-bottom: 1.5rem;
}

.work-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.link-work {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--text);
    text-decoration: none;
    padding: 0.8rem 1.5rem;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    transition: all 0.3s var(--ease);
    position: relative;
    overflow: hidden;
    background: transparent;
    cursor: pointer;
}

.link-icon {
    font-weight: 700;
    color: var(--dim);
    font-size: 0.85rem;
    transition: color 0.3s;
}

.link-work::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 0%, rgba(0, 255, 157, 0.1) 50%, transparent 100%);
    transform: translateX(-100%);
    transition: transform 0.5s var(--ease);
}

.link-work::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(0, 255, 157, 0.12), transparent 50%);
    opacity: 0;
    transition: opacity 0.3s;
}

.link-work:hover::before {
    transform: translateX(100%);
}

.link-work:hover::after {
    opacity: 1;
}

.link-work svg {
    width: 16px;
    height: 16px;
    transition: transform 0.3s var(--ease);
}

.link-work:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-dim);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 255, 157, 0.15);
}

.link-work:hover .link-icon {
    color: var(--accent);
}

.link-work:hover svg {
    transform: translate(3px, -3px);
}

.link-work:active {
    transform: translateY(0);
    box-shadow: none;
}

.link-email svg {
    display: none;
}

.email-hint {
    font-size: 0.75rem;
    color: var(--dim);
    margin-left: 0.25rem;
}

.link-email:hover .email-hint {
    color: var(--accent);
}

.email-display {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    min-height: 1.5rem;
    transition: opacity 0.3s;
}

.email-display.visible {
    color: var(--accent);
}

/* ================================
   Find Section
   ================================ */
.section--find {
    min-height: 50vh;
}

.find-content {
    text-align: center;
    max-width: 500px;
}

.find-intro {
    font-size: clamp(1.2rem, 3vw, 1.6rem);
    font-weight: 300;
    margin-bottom: 1rem;
    opacity: 0;
}

.find-handle {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    opacity: 0;
}

.handle {
    font-family: var(--font-mono);
    color: var(--accent);
    font-weight: 500;
}

.find-note {
    font-size: 0.9rem;
    margin-bottom: 2rem;
    opacity: 0;
}

/* Reconnect Box */
.reconnect-box {
    margin-top: 3rem;
    padding: 2rem;
    border: 1px solid var(--terminal-border);
    border-radius: 12px;
    background: var(--terminal-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.05);
    transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.reconnect-box:hover {
    border-color: rgba(0, 255, 157, 0.15);
    box-shadow: 0 12px 40px rgba(0, 255, 157, 0.06);
}

.reconnect-header {
    font-size: 1.2rem;
    font-weight: 400;
    margin-bottom: 0.5rem;
    color: var(--text);
}

.reconnect-sub {
    font-size: 0.9rem;
    margin-bottom: 0.3rem;
}

.nickname-input-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 1.5rem 0 1rem;
    padding: 0.8rem 1rem;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 8px;
    transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
    width: 100%;
    box-sizing: border-box;
    position: relative;
}

.nickname-input-wrapper::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 10px;
    background: linear-gradient(90deg, var(--accent), #00d4ff, var(--accent));
    background-size: 200% 100%;
    opacity: 0;
    z-index: -1;
    transition: opacity 0.3s var(--ease);
}

.nickname-input-wrapper:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 20px rgba(0, 255, 157, 0.15);
}

.nickname-input-wrapper:focus-within::before {
    opacity: 1;
    animation: borderGlow 2s linear infinite;
}

@keyframes borderGlow {
    0% { background-position: 0% 50%; }
    100% { background-position: 200% 50%; }
}

.input-prompt {
    color: var(--accent);
    font-family: var(--font-mono);
}

.nickname-input {
    flex: 1;
    min-width: 0;
    background: transparent;
    border: none;
    outline: none;
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--text);
}

.nickname-input::placeholder {
    color: var(--dim);
    opacity: 0.6;
}

.nickname-response {
    min-height: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent);
    margin-bottom: 1rem;
    opacity: 0;
    transition: opacity 0.3s var(--ease);
}

.nickname-response.visible {
    opacity: 1;
}

.sesame-btn {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--dim);
    background: transparent;
    border: 1px solid var(--input-border);
    border-radius: 6px;
    padding: 0.8rem 1.5rem;
    cursor: pointer;
    transition: all 0.3s var(--ease);
    position: relative;
    overflow: hidden;
}

.sesame-btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(0, 255, 157, 0.15), transparent 50%);
    opacity: 0;
    transition: opacity 0.3s;
}

.sesame-btn:hover::after {
    opacity: 1;
}

.sesame-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-dim);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 255, 157, 0.12);
}

.sesame-btn:active {
    transform: translateY(0);
    box-shadow: none;
}

.sesame-btn.revealed {
    color: var(--accent);
    border-color: var(--accent);
    background: linear-gradient(135deg, rgba(0, 255, 157, 0.1) 0%, rgba(0, 212, 255, 0.1) 100%);
    animation: pulse 2s ease infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(0, 255, 157, 0.2); }
    50% { box-shadow: 0 0 0 8px rgba(0, 255, 157, 0); }
}

.link-contact {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--dim);
    text-decoration: none;
    padding: 0.8rem 1.5rem;
    border: 1px solid var(--input-border);
    border-radius: 6px;
    transition: all 0.3s var(--ease);
}

.link-contact:hover {
    color: var(--text);
    border-color: var(--text);
}

/* ================================
   End Section
   ================================ */
.section--end {
    min-height: 35vh;
    padding-bottom: 4rem;
}

.end-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.end-sig {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    position: relative;
}

.sig-symbol {
    font-size: 1.8rem;
    background: linear-gradient(
        135deg,
        var(--accent) 0%,
        #00d4ff 25%,
        var(--accent) 50%,
        #ff00ff 75%,
        var(--accent) 100%
    );
    background-size: 400% 400%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: holographicShimmer 8s ease infinite;
}

.sig-name {
    font-size: 1.5rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    transition: letter-spacing 0.3s var(--ease), color 0.3s;
    position: relative;
}

/* Glitch effect on hover */
.end-sig:hover .sig-name {
    letter-spacing: 0.08em;
    color: var(--accent);
    animation: glitch 0.3s ease;
}

@keyframes glitch {
    0% { transform: translate(0); }
    20% { transform: translate(-2px, 2px); }
    40% { transform: translate(-2px, -2px); }
    60% { transform: translate(2px, 2px); }
    80% { transform: translate(2px, -2px); }
    100% { transform: translate(0); }
}

.end-sig::before,
.end-sig::after {
    content: attr(data-text);
    position: absolute;
    left: 2rem;
    opacity: 0;
    pointer-events: none;
}

.end-sig:hover::before {
    animation: glitchTop 0.3s ease;
    color: #00ffff;
    opacity: 0.8;
}

.end-sig:hover::after {
    animation: glitchBottom 0.3s ease;
    color: #ff00ff;
    opacity: 0.8;
}

@keyframes glitchTop {
    0% { clip-path: inset(0 0 50% 0); transform: translate(-2px, -2px); opacity: 0; }
    50% { clip-path: inset(0 0 50% 0); transform: translate(2px, 0); opacity: 0.8; }
    100% { clip-path: inset(0 0 50% 0); transform: translate(0); opacity: 0; }
}

@keyframes glitchBottom {
    0% { clip-path: inset(50% 0 0 0); transform: translate(2px, 2px); opacity: 0; }
    50% { clip-path: inset(50% 0 0 0); transform: translate(-2px, 0); opacity: 0.8; }
    100% { clip-path: inset(50% 0 0 0); transform: translate(0); opacity: 0; }
}

/* Random glitch trigger */
.end-sig.glitching .sig-name {
    animation: glitch 0.2s ease;
    color: var(--accent);
}

.end-sig.glitching .sig-symbol {
    animation: glitch 0.2s ease reverse;
}

.end-message {
    text-align: center;
}

.end-line {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    margin-bottom: 0.3rem;
}

.scroll-top {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--dim);
    background: transparent;
    border: 1px solid var(--input-border);
    border-radius: 6px;
    cursor: pointer;
    padding: 0.6rem 1.2rem;
    transition: all 0.3s var(--ease);
    margin-top: 1rem;
}

.scroll-top:hover {
    color: var(--accent);
    border-color: var(--accent);
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0, 255, 157, 0.1);
}

.scroll-top:hover .scroll-top-text {
    animation: bounce 0.6s ease infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
}

/* ================================
   Theme Toggle
   ================================ */
.theme-toggle {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    z-index: 9998;
    width: 44px;
    height: 44px;
    border: 1px solid var(--input-border);
    border-radius: 50%;
    background: var(--terminal-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s var(--ease);
    color: var(--dim);
}

.theme-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: scale(1.05);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    transition: transform 0.3s var(--ease);
}

.theme-toggle:hover svg {
    transform: rotate(15deg);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
    position: absolute;
    transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
}

/* Dark mode: show sun icon (to switch to light) */
.theme-toggle .icon-sun {
    opacity: 1;
    transform: rotate(0deg);
}

.theme-toggle .icon-moon {
    opacity: 0;
    transform: rotate(-90deg);
}

/* Light mode: show moon icon (to switch to dark) */
[data-theme="light"] .theme-toggle .icon-sun {
    opacity: 0;
    transform: rotate(90deg);
}

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

/* System light preference without manual override */
@media (prefers-color-scheme: light) {
    :root:not([data-theme="dark"]) .theme-toggle .icon-sun {
        opacity: 0;
        transform: rotate(90deg);
    }
    :root:not([data-theme="dark"]) .theme-toggle .icon-moon {
        opacity: 1;
        transform: rotate(0deg);
    }
}

/* ================================
   Utilities
   ================================ */
.dim { color: var(--dim); }
.accent { color: var(--accent); }

/* ================================
   Magnetic
   ================================ */
[data-magnetic] {
    transition: transform 0.3s var(--ease);
}

/* ================================
   Responsive - Tablet (768px)
   ================================ */
@media (max-width: 768px) {
    .section {
        padding: 10vh 6vw;
    }

    .section--hero {
        padding-top: calc(10vh + env(safe-area-inset-top));
    }

    .symbol {
        font-size: 2.5rem;
    }

    .null-meaning .word,
    .oxide-meaning .word {
        font-size: 2.5rem;
    }

    .terminal-window {
        max-width: 100%;
    }

    .terminal-body {
        font-size: 0.75rem;
        padding: 1rem;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .terminal-line {
        white-space: nowrap;
    }

    .philosophy-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .depth-visual {
        width: 180px;
        height: 180px;
    }

    .wave-container {
        max-width: 100%;
    }

    .section--meta {
        padding: 4vh 6vw;
    }

    .meta-comment {
        font-size: 0.8rem;
    }

    .work-links {
        flex-direction: column;
        align-items: center;
    }

    .link-work {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

    .reconnect-box {
        padding: 1.5rem;
    }

    .nickname-input {
        font-size: 16px; /* Prevents iOS zoom */
    }

    .end-sig {
        font-size: 1.5rem;
    }
}

/* ================================
   Responsive - Phone (480px)
   ================================ */
@media (max-width: 480px) {
    .section {
        padding: 8vh 5vw;
    }

    .symbol {
        font-size: 2rem;
    }

    .null-meaning .word,
    .oxide-meaning .word {
        font-size: 1.8rem;
    }

    .null-meaning .definition,
    .oxide-meaning .definition {
        font-size: 0.75rem;
    }

    .plus {
        font-size: 1.2rem;
    }

    .hero-sub {
        font-size: 0.85rem;
        margin-top: 2.5rem;
    }

    .terminal-header {
        padding: 0.5rem 0.75rem;
    }

    .terminal-body {
        font-size: 0.65rem;
        padding: 0.75rem;
    }

    .depth-visual {
        width: 140px;
        height: 140px;
    }

    .depth-text p {
        font-size: 1.2rem;
    }

    .balance-text {
        font-size: 0.9rem;
    }

    .meta-comment {
        font-size: 0.7rem;
    }

    .location-response {
        font-size: 1rem;
    }

    .work-intro {
        font-size: 0.9rem;
    }

    .find-handle .handle {
        font-size: 1.3rem;
    }

    .reconnect-box {
        padding: 1rem;
    }

    .reconnect-header {
        font-size: 1rem;
    }

    .nickname-input {
        font-size: 16px; /* Prevents iOS zoom */
        padding: 0.6rem 0;
    }

    .sesame-btn {
        padding: 0.8rem 1.5rem;
        font-size: 0.85rem;
    }

    .end-sig {
        font-size: 1.2rem;
    }

    .end-message {
        font-size: 0.75rem;
    }

    .scroll-top {
        padding: 0.6rem 1.2rem;
        font-size: 0.75rem;
    }
}

/* ================================
   Reduced Motion
   ================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .scroll-progress {
        display: none;
    }

    #void,
    #wave {
        display: none;
    }

    .word .letter {
        animation: none !important;
    }

    .layer {
        animation: none !important;
    }
}