/* ============================================
   freedom.study - Styles
   Dark-academia scholarly timeline experience
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    --deep-bg: #0F0F1A;
    --secondary-bg: #1B1B2F;
    --parchment: #D4C5A9;
    --gold: #C4A265;
    --twilight: #4A6B8A;
    --bronze: #7A6F5D;
    --wax: #8B3A3A;
    --folio: #2A2A3E;

    --font-display: 'Cormorant Garamond', 'Georgia', serif;
    --font-body: 'Source Serif 4', 'Georgia', serif;
    --font-ui: 'Anybody', 'Helvetica Neue', sans-serif;

    --ease-book: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

    --timeline-offset: 8%;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--deep-bg);
    color: var(--parchment);
    font-family: var(--font-body);
    font-size: clamp(1rem, 1.1vw, 1.15rem);
    line-height: 1.75;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- Noise Texture Overlay --- */
.noise-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1000;
    opacity: 0;
    background-image: url("data:image/png;base64,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");
    background-repeat: repeat;
    mix-blend-mode: overlay;
}

/* --- Top Navigation Bar --- */
.top-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 40px;
    background: transparent;
    transition: background 0.4s var(--ease-book);
}

.top-bar.scrolled {
    background: rgba(15, 15, 26, 0.92);
    backdrop-filter: blur(8px);
}

.wordmark {
    font-family: var(--font-ui);
    font-weight: 500;
    font-size: 0.85rem;
    color: var(--gold);
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.contents-toggle {
    font-family: var(--font-ui);
    font-weight: 300;
    font-size: 0.8rem;
    color: var(--bronze);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    background: none;
    border: 1px solid var(--bronze);
    padding: 6px 16px;
    cursor: pointer;
    transition: color 0.3s var(--ease-book), border-color 0.3s var(--ease-book);
}

.contents-toggle:hover {
    color: var(--gold);
    border-color: var(--gold);
}

/* --- Table of Contents Overlay --- */
.toc-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 200;
    background: rgba(15, 15, 26, 0.95);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s var(--ease-book);
}

.toc-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.toc-panel {
    max-width: 520px;
    width: 90%;
}

.toc-header {
    text-align: center;
    margin-bottom: 48px;
}

.toc-seal {
    display: inline-block;
    width: 60px;
    height: 60px;
    margin-bottom: 20px;
}

.seal-icon {
    width: 100%;
    height: 100%;
}

.toc-title {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 1.4rem;
    color: var(--parchment);
    letter-spacing: 0.08em;
}

.toc-list {
    list-style: none;
}

.toc-item {
    margin-bottom: 16px;
}

.toc-link {
    display: flex;
    align-items: baseline;
    text-decoration: none;
    color: var(--parchment);
    font-family: var(--font-body);
    font-size: 1.1rem;
    transition: color 0.3s var(--ease-book);
    gap: 8px;
}

.toc-link:hover {
    color: var(--gold);
}

.toc-number {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.2rem;
    color: var(--gold);
    min-width: 36px;
}

.toc-dots {
    flex: 1;
    border-bottom: 1px dotted var(--bronze);
    opacity: 0.4;
    margin-bottom: 4px;
}

.toc-label {
    font-family: var(--font-body);
    font-weight: 400;
}

/* --- Timeline Spine --- */
.timeline-spine {
    position: fixed;
    left: var(--timeline-offset);
    top: 0;
    bottom: 0;
    width: 20px;
    z-index: 50;
    transform: translateX(-50%);
}

.timeline-svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.timeline-track {
    opacity: 0.4;
}

.timeline-fill {
    stroke-dasharray: 100;
    stroke-dashoffset: 100;
    transition: stroke-dashoffset 0.05s linear;
}

.timeline-node {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.node-circle {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--deep-bg);
    border: 2px solid var(--bronze);
    transition: background 0.3s ease-out, border-color 0.3s ease-out, box-shadow 0.3s ease-out;
    margin-left: -6px;
}

.timeline-node.active .node-circle {
    background: var(--gold);
    border-color: var(--secondary-bg);
    box-shadow: 0 0 20px rgba(196, 162, 101, 0.3);
}

.epoch-label {
    position: absolute;
    left: -10px;
    top: 50%;
    transform: rotate(-90deg) translateX(-50%);
    transform-origin: left center;
    font-family: var(--font-ui);
    font-weight: 500;
    font-size: 0.7rem;
    color: var(--bronze);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.4s var(--ease-book), transform 0.4s var(--ease-book);
}

.timeline-node.active .epoch-label {
    opacity: 1;
    transform: rotate(-90deg) translateX(-50%) translateY(0);
}

/* --- Main Scroll Container --- */
.scroll-container {
    scroll-snap-type: y mandatory;
    overflow-y: auto;
    height: 100vh;
    scroll-behavior: smooth;
}

/* --- Study Chambers --- */
.study-chamber {
    min-height: 100vh;
    scroll-snap-align: start;
    position: relative;
    display: flex;
    align-items: center;
    padding: 120px 5% 120px calc(var(--timeline-offset) + 60px);
    background: var(--deep-bg);
    overflow: hidden;
}

/* --- Seal Watermark --- */
.seal-watermark {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 400px;
    height: 400px;
    opacity: 0.05;
    pointer-events: none;
    animation: rotateSeal 120s linear infinite;
}

.seal-watermark-final {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0);
    animation: none;
    transition: opacity 2s var(--ease-spring), transform 2s var(--ease-spring);
}

.seal-watermark-final.revealed {
    opacity: 0.4;
    transform: translate(-50%, -50%) scale(1);
}

.seal-svg {
    width: 100%;
    height: 100%;
}

@keyframes rotateSeal {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* --- Chamber Content --- */
.chamber-content {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1100px;
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 60px;
    align-items: start;
}

.opening-content {
    grid-template-columns: 1fr;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.final-content {
    grid-template-columns: 1fr;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* --- Display Headings --- */
.display-heading {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2.5rem, 6vw, 5.5rem);
    color: var(--parchment);
    letter-spacing: 0.02em;
    line-height: 1.05;
    margin-bottom: 24px;
}

.main-heading {
    opacity: 0;
    transition: opacity 0.8s var(--ease-book);
}

.main-heading.visible {
    opacity: 1;
}

.subtitle {
    font-family: var(--font-body);
    font-size: 1.2rem;
    font-style: italic;
    color: var(--bronze);
    opacity: 0;
    transition: opacity 0.6s var(--ease-book);
    transition-delay: 0.4s;
    max-width: 540px;
}

.subtitle.visible {
    opacity: 1;
}

/* --- Typewriter Effect --- */
.typewriter-text {
    overflow: hidden;
    white-space: nowrap;
    width: 0;
    opacity: 0;
    border-right: 2px solid var(--gold);
    grid-column: 1 / -1;
}

.typewriter-text.typing {
    opacity: 1;
    animation: typewriterBlink 0.7s step-end infinite;
}

.typewriter-text.typed {
    border-right-color: transparent;
    animation: none;
}

@keyframes typewriterBlink {
    0%, 100% { border-right-color: var(--gold); }
    50% { border-right-color: transparent; }
}

/* --- Chamber Heading for non-opening sections --- */
.chamber-heading {
    font-size: clamp(2rem, 5vw, 4rem);
    margin-bottom: 40px;
}

/* --- Body Content --- */
.body-content {
    max-width: 680px;
}

.body-paragraph {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(1rem, 1.1vw, 1.15rem);
    line-height: 1.75;
    color: #B8A88A;
    text-align: justify;
    hyphens: auto;
    margin-bottom: 24px;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s var(--ease-book), transform 0.6s var(--ease-book);
}

.body-paragraph.revealed {
    opacity: 1;
    transform: translateY(0);
}

.body-paragraph em {
    color: var(--parchment);
    font-style: italic;
}

/* --- Footnote References --- */
.footnote-ref {
    display: inline-block;
    cursor: pointer;
    vertical-align: super;
    margin-left: 2px;
    line-height: 1;
}

.quill-icon {
    width: 12px;
    height: 12px;
    display: inline-block;
    vertical-align: text-top;
    transition: transform 0.3s var(--ease-book);
}

.footnote-ref:hover .quill-icon {
    transform: rotate(15deg);
}

/* --- Manuscript Fragments --- */
.manuscript-fragment {
    position: relative;
    background: var(--folio);
    background-image:
        radial-gradient(ellipse at 20% 50%, rgba(27, 27, 47, 0.6) 0%, transparent 70%),
        radial-gradient(ellipse at 80% 20%, rgba(42, 42, 62, 0.4) 0%, transparent 60%);
    padding: 32px 28px 28px;
    transform: rotate(-0.5deg);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
    opacity: 0;
    transition: opacity 0.5s var(--ease-book), transform 0.5s var(--ease-book);
    transition-delay: 0.6s;
    align-self: start;
    margin-top: 80px;
}

.manuscript-fragment.revealed {
    opacity: 1;
    transform: rotate(-0.5deg);
}

.fragment-torn-edge {
    position: absolute;
    top: -6px;
    left: 0;
    right: 0;
    height: 8px;
    background: var(--folio);
    clip-path: polygon(
        0% 100%, 2% 40%, 5% 80%, 8% 20%, 12% 70%, 15% 30%, 18% 90%,
        22% 10%, 25% 60%, 28% 25%, 32% 85%, 35% 15%, 38% 55%, 42% 35%,
        45% 75%, 48% 20%, 52% 65%, 55% 40%, 58% 80%, 62% 10%, 65% 50%,
        68% 30%, 72% 70%, 75% 15%, 78% 60%, 82% 35%, 85% 90%, 88% 25%,
        92% 55%, 95% 45%, 98% 80%, 100% 100%
    );
}

.manuscript-fragment blockquote {
    font-family: var(--font-body);
    font-size: 0.95rem;
    line-height: 1.65;
    color: var(--parchment);
    font-style: italic;
}

.fragment-attribution {
    display: block;
    margin-top: 16px;
    font-family: var(--font-ui);
    font-weight: 300;
    font-size: 0.75rem;
    color: var(--wax);
    font-style: normal;
    letter-spacing: 0.05em;
}

/* --- Ornamental Divider --- */
.ornamental-divider {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    width: 200px;
}

.divider-svg {
    width: 100%;
    height: 20px;
}

/* --- Final Chamber Specific --- */
.chamber-final {
    background: var(--secondary-bg);
}

.final-heading {
    font-size: clamp(2.5rem, 6vw, 5rem);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s var(--ease-book), transform 0.8s var(--ease-book);
    white-space: normal;
    width: auto;
    overflow: visible;
    border-right: none;
}

.final-heading.revealed {
    opacity: 1;
    transform: translateY(0);
}

.final-statement {
    font-family: var(--font-body);
    font-size: 1.2rem;
    font-style: italic;
    color: var(--bronze);
    line-height: 1.85;
    max-width: 620px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s var(--ease-book), transform 0.8s var(--ease-book);
    transition-delay: 0.6s;
}

.final-statement.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* --- Annotation Sidebar --- */
.annotation-sidebar {
    position: fixed;
    top: 0;
    right: -380px;
    width: 340px;
    height: 100vh;
    background: rgba(27, 27, 47, 0.92);
    z-index: 150;
    padding: 80px 28px 40px;
    overflow-y: auto;
    transition: right 0.4s var(--ease-spring);
    border-left: 1px solid rgba(196, 162, 101, 0.15);
}

.annotation-sidebar.open {
    right: 0;
}

.annotation-close {
    position: absolute;
    top: 24px;
    right: 24px;
    background: none;
    border: none;
    color: var(--bronze);
    font-size: 1.6rem;
    cursor: pointer;
    transition: color 0.3s var(--ease-book);
    font-family: var(--font-ui);
}

.annotation-close:hover {
    color: var(--gold);
}

.annotation-note {
    margin-bottom: 32px;
    padding-left: 16px;
    border-left: 3px solid transparent;
    opacity: 0.6;
    transition: opacity 0.3s var(--ease-book), border-color 0.3s var(--ease-book);
}

.annotation-note.highlighted {
    opacity: 1;
    border-left-color: var(--gold);
}

.annotation-note h4 {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1rem;
    color: var(--parchment);
    margin-bottom: 8px;
}

.annotation-note p {
    font-family: var(--font-body);
    font-size: 0.9rem;
    line-height: 1.65;
    color: var(--parchment);
}

.annotation-note p em {
    color: var(--gold);
}

/* --- Responsive: Tablet (< 768px) --- */
@media (max-width: 768px) {
    .timeline-spine {
        display: none;
    }

    .study-chamber {
        padding: 100px 24px 80px 24px;
    }

    .chamber-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .manuscript-fragment {
        margin-top: 24px;
        transform: rotate(0deg);
    }

    .manuscript-fragment.revealed {
        transform: rotate(0deg);
    }

    .typewriter-text {
        white-space: normal;
        overflow: visible;
        width: auto;
        border-right: none;
    }

    .annotation-sidebar {
        right: auto;
        bottom: -100%;
        left: 0;
        width: 100%;
        height: 60vh;
        top: auto;
        transition: bottom 0.4s var(--ease-spring);
        border-left: none;
        border-top: 1px solid rgba(196, 162, 101, 0.15);
    }

    .annotation-sidebar.open {
        bottom: 0;
    }

    .top-bar {
        padding: 16px 20px;
    }
}

/* --- Responsive: Mobile (< 480px) --- */
@media (max-width: 480px) {
    .display-heading {
        font-size: clamp(1.8rem, 8vw, 2.8rem);
    }

    .chamber-heading {
        font-size: clamp(1.5rem, 7vw, 2.2rem);
    }

    .body-paragraph {
        line-height: 1.85;
        text-align: left;
    }

    .epoch-label {
        position: static;
        transform: none;
        display: block;
        margin-bottom: 8px;
        opacity: 1;
    }

    .study-chamber {
        padding: 80px 16px 60px 16px;
    }

    .final-heading {
        font-size: clamp(1.8rem, 8vw, 3rem);
    }
}

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

    .seal-watermark {
        animation: none;
    }

    .scroll-container {
        scroll-snap-type: none;
    }
}