/*
 * FOUNDER'S DIARY - DESIGN SYSTEM
 *
 * Clean editorial aesthetic inspired by long-form journalism.
 *
 * Usage:
 *   <link rel="stylesheet" href="../styles/design-system.css">
 *   or
 *   <link rel="stylesheet" href="styles/design-system.css">
 */


/* ─────────────────────────────────────────────────────────────
   1. CSS VARIABLES (Design Tokens)
   ───────────────────────────────────────────────────────────── */

:root {
    /* === Colors === */

    /* Background */
    --color-bg-dark: #1A1A2E;
    --color-bg-paper: #FAF8F5;
    --color-bg-paper-aged: #F5F2ED;
    --color-bg-paper-edge: #E8E4DF;

    /* Text */
    --color-ink: #1A1A2E;
    --color-ink-dark: #1A1A2E;
    --color-ink-warm: #5A5A6E;
    --color-ink-light: #5A5A6E;
    --color-ink-muted: #8A8A9A;
    --color-ink-faint: #ACACAC;
    --color-accent-brown: #6B7B8D;
    --color-accent-tan: #B8C4D0;
    --color-accent-warm: #8A8A9A;

    /* Accents */
    --color-margin-red: #D94F3D;
    --color-highlight-yellow: rgba(217, 79, 61, 0.08);
    --color-highlight-yellow-dark: #D94F3D;

    /* Box colors */
    --color-box1: #D94F3D;
    --color-box1-bg: rgba(217, 79, 61, 0.08);
    --color-box2: #C9963B;
    --color-box2-bg: rgba(201, 150, 59, 0.08);
    --color-box3: #4A7C59;
    --color-box3-bg: rgba(74, 124, 89, 0.08);

    /* Status colors */
    --color-wrong: #D94F3D;
    --color-wrong-bg: rgba(217, 79, 61, 0.06);
    --color-right: #4A7C59;
    --color-right-bg: rgba(74, 124, 89, 0.06);

    /* === Typography === */
    --font-handwriting: 'Libre Baskerville', Georgia, serif;
    --font-casual: 'Source Sans 3', -apple-system, sans-serif;
    --font-typewriter: 'Source Sans 3', -apple-system, sans-serif;
    --font-serif: 'Libre Baskerville', Georgia, serif;

    /* === Spacing === */
    --space-xs: 5px;
    --space-sm: 10px;
    --space-md: 15px;
    --space-lg: 20px;
    --space-xl: 30px;
    --space-xxl: 40px;

    /* === Borders === */
    --border-sketchy: 2px;
    --border-blob: 2px;
    --border-torn: 2px;
    --border-wobbly: 2px;
    --border-card: 2px;

    /* === Shadows === */
    --shadow-paper: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-card: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-card-hover: 0 4px 12px rgba(0,0,0,0.1);

    /* === Line heights === */
    --line-ruled: 32px;
}


/* ─────────────────────────────────────────────────────────────
   2. FONT IMPORTS
   ───────────────────────────────────────────────────────────── */

/* Add to your HTML <head>:
   <link href="https://fonts.googleapis.com/css2?family=Libre+Baskerville:ital,wght@0,400;0,700;1,400&family=Source+Sans+3:wght@300;400;500;600;700&display=swap" rel="stylesheet">
*/


/* ─────────────────────────────────────────────────────────────
   3. BASE RESET & DEFAULTS
   ───────────────────────────────────────────────────────────── */

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

body {
    background: var(--color-bg-paper);
    min-height: 100vh;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}


/* ─────────────────────────────────────────────────────────────
   4. ENTRY LIST (Diary index)
   ───────────────────────────────────────────────────────────── */

.entries {
    list-style: none;
}

.entry-link {
    display: block;
    padding: 28px 0;
    border-bottom: 1px solid var(--color-bg-paper-edge);
    transition: all 0.2s ease;
    text-decoration: none;
    color: inherit;
    cursor: pointer;
}

.entry-link:hover {
    padding-left: 12px;
}

.entry-link:last-child {
    border-bottom: none;
}

.entry-meta {
    font-family: var(--font-typewriter);
    font-size: 13px;
    font-weight: 600;
    color: var(--color-accent-brown);
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    letter-spacing: 0.5px;
}

.entry-meta::before {
    content: none;
}

.entry-num {
    background: var(--color-ink);
    color: var(--color-bg-paper);
    padding: 2px 8px;
    border-radius: 2px;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 1px;
}

.entry-link h2 {
    font-family: var(--font-handwriting);
    font-size: 1.25rem;
    color: var(--color-ink);
    margin-bottom: 8px;
    line-height: 1.3;
}

.entry-preview {
    font-size: 0.95rem;
    color: var(--color-ink-light);
    line-height: 1.7;
    font-style: italic;
}

.entry-tags {
    margin-top: 12px;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tag {
    font-family: var(--font-typewriter);
    font-size: 12px;
    font-weight: 500;
    padding: 3px 10px;
    background: transparent;
    border: 1px solid var(--color-bg-paper-edge);
    border-radius: 2px;
    color: var(--color-ink-light);
}


/* ─────────────────────────────────────────────────────────────
   6. NOTEPAD (Entry page container)
   ───────────────────────────────────────────────────────────── */

.notepad {
    font-family: var(--font-casual);
    font-size: 18px;
    max-width: 780px;
    width: 100%;
    margin: 0 auto;
    padding: 80px 24px 120px;
    position: relative;
    color: var(--color-ink);
}

.entry-header {
    margin-bottom: 40px;
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-bg-paper-edge);
}

.entry-number {
    font-family: var(--font-typewriter);
    font-size: 13px;
    font-weight: 600;
    color: var(--color-accent-brown);
    letter-spacing: 2px;
    text-transform: uppercase;
}

.entry-date {
    font-family: var(--font-typewriter);
    font-size: 13px;
    color: var(--color-ink-muted);
    float: right;
}

.notepad h1 {
    font-family: var(--font-handwriting);
    font-size: clamp(36px, 5vw, 52px);
    font-weight: 700;
    color: var(--color-ink);
    margin: 12px 0;
    line-height: 1.2;
    position: relative;
    display: inline-block;
}

.notepad h1::after {
    content: none;
}

.notepad .subtitle {
    font-family: var(--font-serif);
    color: var(--color-ink-light);
    font-size: 1.1rem;
    margin-top: 12px;
    font-style: italic;
    line-height: 1.5;
}

.entry-footer {
    margin-top: 80px;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-bg-paper-edge);
    text-align: center;
    font-family: var(--font-typewriter);
    font-size: 13px;
    color: var(--color-ink-faint);
}


/* ─────────────────────────────────────────────────────────────
   7. NAVIGATION
   ───────────────────────────────────────────────────────────── */

.back-link {
    display: inline-block;
    font-family: var(--font-typewriter);
    color: var(--color-ink-muted);
    text-decoration: none;
    font-size: 14px;
    margin-bottom: var(--space-lg);
    padding: var(--space-xs) 0;
    border-bottom: 1px solid var(--color-bg-paper-edge);
    transition: color 0.2s;
}

.back-link:hover {
    color: var(--color-ink);
}

.nav-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin: 32px 0;
    padding: 0;
    border-top: none;
    border-bottom: 1px solid var(--color-bg-paper-edge);
}

.nav-tabs button {
    font-family: var(--font-casual);
    font-size: 15px;
    font-weight: 500;
    padding: 10px 18px;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    color: var(--color-ink-muted);
    transition: all 0.2s;
    border-radius: 0;
}

.nav-tabs button:hover {
    color: var(--color-ink);
}

.nav-tabs button.active {
    background: transparent;
    color: var(--color-ink);
    border-bottom-color: var(--color-ink);
}


/* ─────────────────────────────────────────────────────────────
   8. SECTIONS & CARDS
   ───────────────────────────────────────────────────────────── */

.section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.card {
    margin: 32px 0;
    padding: 28px;
    background: #fff;
    border: 1px solid var(--color-bg-paper-edge);
    border-radius: 2px;
    position: relative;
}

.card h2 {
    font-family: var(--font-handwriting);
    font-size: 28px;
    font-weight: 700;
    color: var(--color-ink);
    margin-bottom: var(--space-md);
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-bg-paper-edge);
}

.card h3 {
    font-family: var(--font-handwriting);
    font-size: 22px;
    font-weight: 700;
    color: var(--color-ink);
    margin: var(--space-lg) 0 var(--space-sm);
}


/* ─────────────────────────────────────────────────────────────
   9. THREE BOXES (Framework visual)
   ───────────────────────────────────────────────────────────── */

.boxes-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    margin: var(--space-lg) 0;
}

.box {
    padding: var(--space-lg);
    text-align: center;
    border: 1px solid;
    border-radius: 2px;
}

.box-1 { border-color: var(--color-box1); background: var(--color-box1-bg); }
.box-2 { border-color: var(--color-box2); background: var(--color-box2-bg); }
.box-3 { border-color: var(--color-box3); background: var(--color-box3-bg); }

.box-num {
    font-family: var(--font-casual);
    font-size: 2rem;
    font-weight: 700;
    line-height: 1;
}

.box-1 .box-num { color: var(--color-box1); }
.box-2 .box-num { color: var(--color-box2); }
.box-3 .box-num { color: var(--color-box3); }

.box-title {
    font-family: var(--font-handwriting);
    font-weight: 700;
    font-size: 1rem;
    margin: var(--space-xs) 0;
}

.box-desc {
    font-size: 0.85rem;
    color: var(--color-ink-light);
}


/* ─────────────────────────────────────────────────────────────
   10. KEY POINTS (Highlighted insights)
   ───────────────────────────────────────────────────────────── */

.key-point {
    background: var(--color-highlight-yellow);
    padding: 20px 24px;
    margin: 24px 0;
    border-left: 3px solid var(--color-highlight-yellow-dark);
    border-radius: 2px;
    font-size: 1rem;
    position: relative;
}

.key-point strong {
    font-family: var(--font-handwriting);
    font-size: 1rem;
}

.key-point::before {
    content: none;
}


/* ─────────────────────────────────────────────────────────────
   11. COMPARISON COLUMNS
   ───────────────────────────────────────────────────────────── */

.compare {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    margin: var(--space-lg) 0;
}

.compare-col {
    padding: var(--space-lg);
    border: 1px solid var(--color-bg-paper-edge);
    border-radius: 2px;
    font-size: 0.95rem;
}

.compare-col.wrong {
    background: var(--color-wrong-bg);
    border-color: var(--color-wrong);
}

.compare-col.right {
    background: var(--color-right-bg);
    border-color: var(--color-right);
}

.compare-col strong {
    display: block;
    font-family: var(--font-handwriting);
    font-size: 1rem;
    margin-bottom: 8px;
    padding-bottom: var(--space-xs);
    border-bottom: 1px solid var(--color-bg-paper-edge);
}


/* ─────────────────────────────────────────────────────────────
   12. ASIDE (Personal voice callout — left bar, no label)
   ───────────────────────────────────────────────────────────── */

.aside {
    border-left: 3px solid var(--color-ink);
    padding: 2px 0 2px 16px;
    margin: 14px 0;
    font-style: italic;
    color: var(--color-ink-light);
    line-height: 1.65;
}

/* ─────────────────────────────────────────────────────────────
   12b. NYANTRACE CALLOUT (Entry footer conversion element)
   ───────────────────────────────────────────────────────────── */

.nyantrace-callout {
    border: 1px solid var(--color-ink);
    border-radius: 2px;
    padding: 20px 24px;
    margin: 60px 0 32px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.nyantrace-callout-label {
    font-family: var(--font-typewriter);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--color-ink-muted);
}

.nyantrace-callout-name {
    font-family: var(--font-handwriting);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-ink);
    line-height: 1.2;
}

.nyantrace-callout p {
    font-family: var(--font-casual);
    font-size: 0.95rem;
    color: var(--color-ink-light);
    line-height: 1.6;
    margin: 0;
}

.nyantrace-callout a {
    font-family: var(--font-typewriter);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-ink);
    text-decoration: none;
    border-bottom: 1px solid var(--color-ink-muted);
    padding-bottom: 1px;
    align-self: flex-start;
    margin-top: 4px;
    transition: border-color 0.2s;
}

.nyantrace-callout a:hover {
    border-color: var(--color-ink);
}


/* ─────────────────────────────────────────────────────────────
   13. EXAMPLES / CALLOUTS
   ───────────────────────────────────────────────────────────── */

.example {
    background: rgba(0,0,0,0.02);
    padding: 16px 20px;
    margin: 16px 0;
    border-left: 3px solid var(--color-bg-paper-edge);
    font-style: italic;
}

.example-label {
    font-family: var(--font-typewriter);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-ink-muted);
    font-style: normal;
    margin-bottom: var(--space-xs);
}


/* ─────────────────────────────────────────────────────────────
   14. TIMELINE
   ───────────────────────────────────────────────────────────── */

.timeline {
    position: relative;
    margin: var(--space-lg) 0 var(--space-lg) var(--space-lg);
    padding-left: 25px;
    border-left: 2px solid var(--color-bg-paper-edge);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--color-bg-paper-edge);
}

.timeline-item:last-child {
    border-bottom: none;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -32px;
    top: 6px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-ink-muted);
}

.timeline-item strong {
    font-family: var(--font-handwriting);
    font-size: 1.05rem;
    color: var(--color-ink);
}


/* ─────────────────────────────────────────────────────────────
   15. FLASHCARDS (Quiz)
   ───────────────────────────────────────────────────────────── */

.flashcard {
    background: #fff;
    border: 1px solid var(--color-bg-paper-edge);
    padding: 20px 24px;
    margin: 16px 0;
    cursor: pointer;
    border-radius: 2px;
    transition: all 0.2s;
    box-shadow: var(--shadow-card);
}

.flashcard:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-card-hover);
}

.flashcard .question {
    font-family: var(--font-handwriting);
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-ink);
}

.flashcard .hint {
    font-family: var(--font-typewriter);
    font-size: 12px;
    color: var(--color-ink-faint);
    margin-top: 8px;
}

.flashcard .answer {
    display: none;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--color-bg-paper-edge);
    color: var(--color-ink-light);
}

.flashcard.revealed .answer {
    display: block;
}

.flashcard.revealed .hint {
    display: none;
}


/* ─────────────────────────────────────────────────────────────
   16. SUMMARY LIST
   ───────────────────────────────────────────────────────────── */

.summary-list {
    list-style: none;
    margin: var(--space-md) 0;
}

.summary-list li {
    padding: var(--space-sm) 0 var(--space-sm) 30px;
    position: relative;
    border-bottom: 1px solid var(--color-bg-paper-edge);
}

.summary-list li:last-child {
    border-bottom: none;
}

.summary-list li::before {
    content: '✓';
    position: absolute;
    left: var(--space-xs);
    top: var(--space-sm);
    font-size: 1rem;
    color: var(--color-box3);
    font-weight: 700;
}

.summary-list li strong {
    font-family: var(--font-handwriting);
    font-size: 0.95rem;
}


/* ─────────────────────────────────────────────────────────────
   17. DECORATIONS (hidden in editorial mode)
   ───────────────────────────────────────────────────────────── */

.coffee-stain,
.ink-splatter,
.ink-splatter::before,
.ink-splatter::after,
.doodle {
    display: none;
}


/* ─────────────────────────────────────────────────────────────
   18. RESPONSIVE
   ───────────────────────────────────────────────────────────── */

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

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

@media (max-width: 600px) {
    .stat-bar .label { min-width: 90px; font-size: 0.75rem; }

    .notepad {
        padding: 40px 20px 60px;
    }

    .notepad h1 {
        font-size: 1.8rem;
    }

    .nav-tabs button {
        font-size: 14px;
        padding: 8px 14px;
    }

    .entry-link h2 {
        font-size: 1.3rem;
    }
}


/* ─────────────────────────────────────────────────────────────
   19. PROCESS FLOW (Horizontal step chains)
   ───────────────────────────────────────────────────────────── */

.process-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin: 24px 0;
    flex-wrap: wrap;
}

.process-step {
    background: #fff;
    border: 1px solid var(--color-bg-paper-edge);
    padding: 8px 16px;
    border-radius: 2px;
    font-family: var(--font-casual);
    font-size: 0.95rem;
    font-weight: 600;
    text-align: center;
}

.process-arrow {
    font-size: 1.1rem;
    color: var(--color-ink-muted);
}


/* ─────────────────────────────────────────────────────────────
   20. STAT BAR (Horizontal bar charts)
   ───────────────────────────────────────────────────────────── */

.stat-bar {
    margin: 8px 0;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
}

.stat-bar .label {
    min-width: 140px;
    font-size: 0.85rem;
    font-family: var(--font-casual);
    color: var(--color-ink-light);
    text-align: right;
}

.stat-bar .bar-track {
    flex: 1;
    height: 18px;
    background: rgba(0,0,0,0.03);
    border: 1px solid var(--color-bg-paper-edge);
    border-radius: 2px;
    overflow: hidden;
}

.stat-bar .bar-fill {
    height: 100%;
    border-radius: 2px;
    background: var(--color-ink-muted);
    opacity: 0.3;
}

.stat-bar .pct {
    font-family: var(--font-casual);
    font-weight: 700;
    font-size: 0.95rem;
    min-width: 36px;
    color: var(--color-ink);
}

.stat-bar.challenge .bar-fill {
    background: var(--color-box2);
    opacity: 0.4;
}


/* ─────────────────────────────────────────────────────────────
   21. UTILITIES
   ───────────────────────────────────────────────────────────── */

.text-center { text-align: center; }
.text-muted { color: var(--color-ink-muted); }
.text-small { font-size: 0.85rem; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }


/* ─────────────────────────────────────────────────────────────
   22. PAGINATION
   ───────────────────────────────────────────────────────────── */

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-lg);
    margin-top: var(--space-lg);
}

.pagination-link {
    font-family: var(--font-casual);
    font-size: 0.95rem;
    color: var(--color-ink-muted);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 2px;
    transition: all 0.2s ease;
}

.pagination-link:hover {
    color: var(--color-ink);
    background: var(--color-bg-paper-aged);
}

.pagination-link.disabled {
    opacity: 0.3;
    pointer-events: none;
}

.page-indicator {
    font-family: var(--font-casual);
    font-size: 0.9rem;
    color: var(--color-ink-muted);
}
