/* ============================================
   freedom.study — Styles
   Evolved-minimal | Split-screen | Glitch
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    --neon-violet: #8B5CF6;
    --neon-cyan: #06D6A0;
    --study-dark: #121218;
    --paper-white: #F0ECE4;
    --rebellion-red: #EF4444;
    --neutral-slate: #64748B;
    --split-gold: #D4A843;

    --font-display: 'Crimson Pro', Georgia, serif;
    --font-body: 'Outfit', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --split-ratio: 50%;
}

/* --- Reset & Base --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    background: var(--study-dark);
    color: var(--paper-white);
    font-family: var(--font-body);
    font-size: clamp(15px, 1.6vw, 19px);
    font-weight: 400;
    line-height: 1.75;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* --- Opening Overlay --- */
#opening-overlay {
    position: fixed;
    inset: 0;
    background: var(--study-dark);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
}

#opening-overlay.fade-out {
    opacity: 0;
    transition: opacity 0.6s ease;
}

#opening-overlay.hidden {
    display: none;
}

#opening-split-line {
    position: absolute;
    top: 0;
    left: 50%;
    width: 2px;
    height: 0;
    background: var(--split-gold);
    transform: translateX(-50%);
    box-shadow: 0 0 12px rgba(212, 168, 67, 0.4);
}

#opening-split-line.animate {
    height: 100vh;
    transition: height 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

/* --- Persistent Split Line --- */
#split-line {
    position: fixed;
    top: 0;
    left: var(--split-ratio);
    width: 2px;
    height: 100vh;
    z-index: 100;
    pointer-events: none;
    transform: translateX(-50%);
    opacity: 0;
    transition: left 0.8s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.6s ease;
}

#split-line.visible {
    opacity: 1;
}

#split-line-inner {
    width: 100%;
    height: 100%;
    background: var(--split-gold);
    box-shadow: 0 0 8px rgba(212, 168, 67, 0.3);
}

#split-line.glitch #split-line-inner {
    animation: splitLineGlitch 0.3s steps(6) forwards;
}

@keyframes splitLineGlitch {
    0% { transform: translateX(0); }
    16% { transform: translateX(3px); }
    33% { transform: translateX(-3px); }
    50% { transform: translateX(2px); }
    66% { transform: translateX(-2px); }
    83% { transform: translateX(3px); }
    100% { transform: translateX(0); }
}

/* --- Margin Annotations --- */
.margin-annotation {
    position: fixed;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--neutral-slate);
    opacity: 0;
    z-index: 50;
    white-space: nowrap;
    pointer-events: none;
    letter-spacing: 0.02em;
    transition: opacity 1s ease;
}

.margin-annotation.visible {
    opacity: 0.3;
}

.left-margin {
    left: 12px;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    transform: rotate(180deg);
}

.right-margin {
    right: 12px;
    writing-mode: vertical-rl;
    text-orientation: mixed;
}

/* --- Split Sections --- */
.split-section {
    position: relative;
    min-height: 100vh;
    display: grid;
    grid-template-columns: var(--split-ratio) calc(100% - var(--split-ratio));
    overflow: hidden;
}

.split-left,
.split-right {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 4rem 3rem;
    overflow: hidden;
}

.split-left {
    background: var(--study-dark);
}

.split-right {
    background: #0d0d14;
}

/* --- Gradient Mesh Backgrounds --- */
.gradient-mesh {
    position: absolute;
    inset: 0;
    pointer-events: none;
    opacity: 0.07;
}

.warm-mesh {
    background:
        radial-gradient(ellipse at 20% 30%, var(--neon-violet) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 70%, #6d28d9 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, #4c1d95 0%, transparent 70%);
}

.cool-mesh {
    background:
        radial-gradient(ellipse at 80% 30%, var(--neon-cyan) 0%, transparent 60%),
        radial-gradient(ellipse at 20% 70%, #059669 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, #065f46 0%, transparent 70%);
}

/* --- Split Content --- */
.split-content {
    position: relative;
    z-index: 2;
    max-width: 520px;
}

.split-left .split-content {
    margin-left: auto;
    margin-right: 2rem;
    text-align: right;
}

.split-right .split-content {
    margin-left: 2rem;
    margin-right: auto;
    text-align: left;
}

/* --- Typography --- */
.hero-title {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: clamp(40px, 7vw, 80px);
    letter-spacing: -0.01em;
    line-height: 1.05;
    margin-bottom: 1.5rem;
    position: relative;
}

.split-left .hero-title {
    color: var(--neon-violet);
}

.split-right .hero-title {
    color: var(--neon-cyan);
}

.section-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(28px, 5vw, 64px);
    letter-spacing: -0.01em;
    line-height: 1.1;
    margin-bottom: 1.2rem;
    position: relative;
}

.split-left .section-title {
    color: var(--neon-violet);
}

.split-right .section-title {
    color: var(--neon-cyan);
}

.section-counter {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--split-gold);
    letter-spacing: 0.1em;
    display: block;
    margin-bottom: 0.75rem;
    opacity: 0.7;
}

.freedom-label {
    font-family: var(--font-mono);
    font-size: clamp(12px, 1.2vw, 15px);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 1rem;
    opacity: 0.7;
}

.split-left .freedom-label {
    color: var(--neon-violet);
}

.split-right .freedom-label {
    color: var(--neon-cyan);
}

.freedom-desc {
    font-family: var(--font-body);
    font-size: clamp(15px, 1.6vw, 19px);
    line-height: 1.75;
    color: var(--paper-white);
    opacity: 0.85;
    margin-bottom: 1.5rem;
}

.freedom-quote {
    font-family: var(--font-display);
    font-style: italic;
    font-size: clamp(14px, 1.4vw, 18px);
    line-height: 1.6;
    color: var(--paper-white);
    opacity: 0.6;
    border-left: 2px solid var(--split-gold);
    padding-left: 1rem;
    margin-top: 1.5rem;
}

.split-left .freedom-quote {
    border-left: none;
    border-right: 2px solid var(--split-gold);
    padding-left: 0;
    padding-right: 1rem;
    text-align: right;
}

.freedom-quote cite {
    display: block;
    font-family: var(--font-mono);
    font-style: normal;
    font-size: 11px;
    color: var(--neutral-slate);
    margin-top: 0.5rem;
    letter-spacing: 0.05em;
}

/* --- Duotone Panels --- */
.duotone-panel {
    position: absolute;
    inset: 0;
    pointer-events: none;
    opacity: 0.08;
}

.warm-duotone {
    background: var(--neon-violet);
    mix-blend-mode: multiply;
}

.cool-duotone {
    background: var(--neon-cyan);
    mix-blend-mode: multiply;
}

/* --- Glitch Text Effect --- */
.glitch-text {
    position: relative;
}

.glitch-text::before,
.glitch-text::after {
    content: attr(data-text);
    position: absolute;
    top: 0;
    width: 100%;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
}

.split-left .glitch-text::before,
.split-left .glitch-text::after {
    right: 0;
    text-align: right;
}

.split-right .glitch-text::before,
.split-right .glitch-text::after {
    left: 0;
    text-align: left;
}

.glitch-text::before {
    color: var(--rebellion-red);
    z-index: -1;
}

.glitch-text::after {
    color: var(--neon-cyan);
    z-index: -1;
}

.glitch-text.glitching::before {
    opacity: 0.8;
    animation: glitchTop 0.3s steps(4) forwards;
}

.glitch-text.glitching::after {
    opacity: 0.8;
    animation: glitchBottom 0.3s steps(4) forwards;
}

@keyframes glitchTop {
    0% { clip-path: inset(0 0 80% 0); transform: translate(-2px, 0); }
    25% { clip-path: inset(20% 0 60% 0); transform: translate(2px, 0); }
    50% { clip-path: inset(40% 0 30% 0); transform: translate(-3px, 0); }
    75% { clip-path: inset(60% 0 10% 0); transform: translate(2px, 0); }
    100% { clip-path: inset(0 0 80% 0); transform: translate(0, 0); opacity: 0; }
}

@keyframes glitchBottom {
    0% { clip-path: inset(80% 0 0 0); transform: translate(2px, 0); }
    25% { clip-path: inset(60% 0 20% 0); transform: translate(-2px, 0); }
    50% { clip-path: inset(30% 0 40% 0); transform: translate(3px, 0); }
    75% { clip-path: inset(10% 0 60% 0); transform: translate(-2px, 0); }
    100% { clip-path: inset(80% 0 0 0); transform: translate(0, 0); opacity: 0; }
}

/* --- Scroll Indicator --- */
.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    opacity: 0;
    transition: opacity 0.6s ease;
}

.scroll-indicator.visible {
    opacity: 1;
}

.scroll-text {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--split-gold);
    opacity: 0.6;
}

.scroll-arrow {
    width: 1px;
    height: 24px;
    background: var(--split-gold);
    position: relative;
    animation: scrollBounce 1.5s ease-in-out infinite;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) rotate(45deg);
    width: 8px;
    height: 8px;
    border-right: 1px solid var(--split-gold);
    border-bottom: 1px solid var(--split-gold);
}

@keyframes scrollBounce {
    0%, 100% { transform: translateY(0); opacity: 1; }
    50% { transform: translateY(8px); opacity: 0.4; }
}

/* --- Section Reveal Animations --- */
.split-content {
    opacity: 0;
    transform: translateY(30px);
    filter: blur(8px);
    transition: opacity 0.6s ease, transform 0.6s ease, filter 0.6s ease;
}

.split-section.in-view .split-content {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
}

.split-left .split-content {
    transition-delay: 0.1s;
}

.split-right .split-content {
    transition-delay: 0.3s;
}

/* --- Convergence Section --- */
#convergence {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--study-dark);
    overflow: hidden;
}

#convergence::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 30% 50%, rgba(139, 92, 246, 0.06) 0%, transparent 60%),
        radial-gradient(ellipse at 70% 50%, rgba(6, 214, 160, 0.06) 0%, transparent 60%);
    pointer-events: none;
}

.convergence-inner {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 680px;
    padding: 2rem;
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

#convergence.in-view .convergence-inner {
    opacity: 1;
    transform: translateY(0);
}

.convergence-line {
    width: 2px;
    height: 80px;
    background: linear-gradient(to bottom, var(--neon-violet), var(--split-gold), var(--neon-cyan));
    margin: 0 auto 2.5rem;
    opacity: 0.7;
}

.convergence-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(28px, 4.5vw, 56px);
    letter-spacing: -0.01em;
    line-height: 1.15;
    color: var(--paper-white);
    margin-bottom: 1.5rem;
}

.convergence-text {
    font-family: var(--font-body);
    font-size: clamp(16px, 1.8vw, 20px);
    line-height: 1.8;
    color: var(--paper-white);
    opacity: 0.75;
    margin-bottom: 3rem;
}

.convergence-coda {
    font-family: var(--font-display);
    font-size: clamp(32px, 5vw, 60px);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
}

.coda-domain {
    color: var(--neon-violet);
}

.coda-dot {
    color: var(--split-gold);
}

.coda-tld {
    color: var(--neon-cyan);
}

.convergence-footer {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--neutral-slate);
    opacity: 0.5;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .split-section {
        grid-template-columns: 1fr;
        min-height: auto;
    }

    .split-left,
    .split-right {
        padding: 3rem 1.5rem;
        min-height: 70vh;
    }

    .split-left .split-content,
    .split-right .split-content {
        text-align: left;
        margin: 0;
        max-width: 100%;
    }

    .split-left .freedom-quote {
        border-right: none;
        border-left: 2px solid var(--split-gold);
        padding-right: 0;
        padding-left: 1rem;
        text-align: left;
    }

    #split-line {
        display: none;
    }

    .margin-annotation {
        display: none;
    }

    .scroll-indicator {
        left: 50%;
    }

    .hero-title {
        font-size: clamp(36px, 12vw, 64px);
    }
}

@media (max-width: 480px) {
    .split-left,
    .split-right {
        padding: 2rem 1rem;
        min-height: 60vh;
    }
}