/* Chess Learning Pages - Unified Styles */
/* Used by: openings.html, tactics.html, strategy.html, endgames.html */

/* ==================== Page Layout ==================== */
.learn-page {
    max-width: 1000px;
    margin: 0 auto;
    padding: 100px 40px 80px;
    min-height: 100vh;
}

.learn-header {
    text-align: center;
    margin-bottom: 60px;
    padding: 0 20px;
}

.learn-header h1 {
    font-size: 48px;
    font-weight: 300;
    letter-spacing: 3px;
    color: #1a1a1a;
    margin-bottom: 10px;
}

.learn-header .subtitle {
    font-size: 20px;
    font-weight: 300;
    color: #666;
    letter-spacing: 2px;
    margin-bottom: 30px;
    font-style: italic;
}

.learn-header .intro {
    font-size: 16px;
    line-height: 1.8;
    color: #444;
    max-width: 700px;
    margin: 0 auto;
    font-weight: 300;
}

/* ==================== Search ==================== */
.search-container {
    position: relative;
    max-width: 600px;
    margin: 0 auto 40px;
}

#search-input {
    width: 100%;
    padding: 16px 50px 16px 20px;
    font-size: 16px;
    font-family: 'Helvetica Neue', sans-serif;
    font-weight: 300;
    border: 1px solid #ddd;
    background: #fafafa;
    transition: all 0.3s ease;
    outline: none;
}

#search-input:focus {
    border-color: #1a1a1a;
    background: #fff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

#search-input::placeholder {
    color: #999;
}

.search-icon {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 20px;
    color: #999;
    pointer-events: none;
}

.search-results-count {
    text-align: center;
    margin-top: 10px;
    font-size: 14px;
    color: #666;
    min-height: 20px;
}

.search-results-count.no-results {
    color: #c00;
}

/* ==================== Table of Contents ==================== */
.toc {
    background: #f8f8f8;
    border: 1px solid #e8e8e8;
    padding: 25px 30px;
    margin-bottom: 60px;
}

.toc h3 {
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: #1a1a1a;
    margin-bottom: 15px;
}

.toc ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 10px 30px;
}

.toc a {
    color: #444;
    text-decoration: none;
    font-size: 15px;
    font-weight: 300;
    transition: color 0.2s;
}

.toc a:hover {
    color: #1a1a1a;
    text-decoration: underline;
}

/* ==================== Sections ==================== */
.learn-section {
    margin-bottom: 80px;
}

.learn-section.hidden {
    display: none;
}

.section-header {
    border-bottom: 2px solid #1a1a1a;
    padding-bottom: 15px;
    margin-bottom: 20px;
}

.section-header h2 {
    font-size: 32px;
    font-weight: 300;
    letter-spacing: 2px;
    color: #1a1a1a;
    margin-bottom: 5px;
}

.section-subtitle {
    font-size: 16px;
    color: #666;
    font-style: italic;
    font-weight: 300;
}

.section-intro {
    font-size: 16px;
    line-height: 1.8;
    color: #444;
    margin-bottom: 40px;
    font-weight: 300;
}

/* ==================== Lesson Cards ==================== */
.lesson-card {
    background: #fff;
    border: 1px solid #e8e8e8;
    margin-bottom: 30px;
    transition: all 0.3s ease;
}

.lesson-card:hover {
    border-color: #ccc;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.lesson-card.hidden {
    display: none;
}

.lesson-card.search-match {
    border-left: 3px solid #1a1a1a;
}

.lesson-content {
    padding: 30px;
}

.lesson-title {
    font-size: 24px;
    font-weight: 400;
    letter-spacing: 1px;
    color: #1a1a1a;
    margin-bottom: 20px;
}

.lesson-text {
    font-size: 16px;
    line-height: 1.8;
    color: #444;
    font-weight: 300;
}

.lesson-text p {
    margin-bottom: 15px;
}

.lesson-text p:last-child {
    margin-bottom: 0;
}

.key-insight {
    background: #f8f8f8;
    padding: 15px 20px;
    border-left: 3px solid #1a1a1a;
    margin-top: 20px;
    font-size: 15px;
}

.key-insight strong {
    color: #1a1a1a;
}

/* ==================== Opening Family Cards ==================== */
.family-card .lesson-content {
    padding-bottom: 20px;
}

.family-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: #666;
    background: #f0f0f0;
    padding: 4px 12px;
    margin-bottom: 15px;
}

.structure-info {
    margin-top: 25px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

.structure-info h4 {
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: #1a1a1a;
    margin: 20px 0 10px;
}

.structure-info h4:first-child {
    margin-top: 0;
}

.structure-info p {
    font-size: 15px;
    color: #555;
    margin-bottom: 15px;
}

.structure-info ul {
    padding-left: 20px;
    margin: 0;
}

.structure-info li {
    font-size: 15px;
    color: #555;
    margin-bottom: 8px;
    line-height: 1.6;
}

/* ==================== Popular Opening Cards ==================== */
.opening-card .lesson-content {
    padding-bottom: 20px;
}

.opening-header {
    margin-bottom: 20px;
}

.opening-header .lesson-title {
    margin-bottom: 10px;
}

.opening-moves-display {
    font-family: 'Courier New', monospace;
    font-size: 14px;
    color: #666;
    background: #f8f8f8;
    padding: 8px 15px;
    display: inline-block;
    border-left: 3px solid #1a1a1a;
}

.opening-idea,
.middlegame-plans,
.beginner-mistakes {
    margin-bottom: 25px;
}

.opening-idea h4,
.middlegame-plans h4,
.beginner-mistakes h4 {
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: #1a1a1a;
    margin-bottom: 10px;
}

.opening-idea p {
    font-size: 15px;
    line-height: 1.7;
    color: #444;
}

.middlegame-plans ul,
.beginner-mistakes ul {
    padding-left: 20px;
    margin: 0;
}

.middlegame-plans li,
.beginner-mistakes li {
    font-size: 15px;
    color: #555;
    margin-bottom: 8px;
    line-height: 1.6;
}

/* ==================== View Board Button ==================== */
.view-board-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    background: #1a1a1a;
    color: #fff;
    border: none;
    cursor: pointer;
    font-family: 'Helvetica Neue', sans-serif;
    font-size: 13px;
    font-weight: 400;
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: all 0.3s ease;
    margin-top: 20px;
}

.view-board-btn:hover {
    background: #333;
}

.toggle-arrow {
    font-size: 10px;
    transition: transform 0.3s;
}

/* ==================== Board Section ==================== */
.board-section {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.4s ease, opacity 0.3s ease;
    background: #f8f8f8;
    border-top: 1px solid #e8e8e8;
}

.board-section.expanded {
    max-height: 700px;
    opacity: 1;
    padding: 30px;
}

.board-container {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

.chess-board {
    width: 350px;
    max-width: 100%;
}

.board-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.move-info {
    font-family: 'Courier New', monospace;
    font-size: 14px;
    color: #1a1a1a;
    font-weight: 500;
    min-height: 24px;
    text-align: center;
}

.control-buttons {
    display: flex;
    gap: 8px;
}

.control-btn {
    width: 40px;
    height: 40px;
    background: #fff;
    border: 1px solid #1a1a1a;
    color: #1a1a1a;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.control-btn:hover {
    background: #1a1a1a;
    color: #fff;
}

.control-btn:active {
    transform: scale(0.95);
}

.position-explanation {
    font-size: 15px;
    line-height: 1.7;
    color: #555;
    font-weight: 300;
    text-align: center;
    max-width: 500px;
    margin: 0 auto;
    font-style: italic;
}

/* ==================== Responsive Design ==================== */
@media (max-width: 768px) {
    .learn-page {
        padding: 80px 20px 60px;
    }

    .learn-header h1 {
        font-size: 36px;
        letter-spacing: 2px;
    }

    .learn-header .subtitle {
        font-size: 16px;
    }

    .learn-header .intro {
        font-size: 15px;
    }

    .toc ul {
        flex-direction: column;
        gap: 12px;
    }

    .section-header h2 {
        font-size: 26px;
    }

    .lesson-content {
        padding: 25px 20px;
    }

    .lesson-title {
        font-size: 20px;
    }

    .lesson-text {
        font-size: 15px;
    }

    .chess-board {
        width: 300px;
    }

    .board-section.expanded {
        padding: 25px 20px;
        max-height: 650px;
    }
}

@media (max-width: 480px) {
    .learn-header h1 {
        font-size: 28px;
    }

    .section-header h2 {
        font-size: 22px;
    }

    .lesson-title {
        font-size: 18px;
    }

    .lesson-content {
        padding: 20px 15px;
    }

    .chess-board {
        width: 100%;
        max-width: 280px;
    }

    .control-btn {
        width: 36px;
        height: 36px;
        font-size: 12px;
    }

    .view-board-btn {
        width: 100%;
        justify-content: center;
    }

    .position-explanation {
        font-size: 14px;
    }
}

/* ==================== Classical Games ==================== */
.classical-games {
    margin-top: 30px;
    padding-top: 25px;
    border-top: 1px solid #e0e0e0;
}

.classical-games h4 {
    font-size: 18px;
    font-weight: 400;
    letter-spacing: 1px;
    color: #1a1a1a;
    margin-bottom: 12px;
}

.classical-games-intro {
    font-size: 14px;
    color: #666;
    margin-bottom: 16px;
    font-style: italic;
}

.classical-games-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.classical-game-link {
    display: block;
    padding: 12px 16px;
    background: #f8f8f8;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    text-decoration: none;
    transition: all 0.2s ease;
    font-size: 14px;
    color: #1a1a1a;
    font-family: 'Helvetica Neue', sans-serif;
    line-height: 1.5;
}

.classical-game-link:hover {
    background: #fff;
    border-color: #b58863;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transform: translateY(-1px);
}

/* Legacy support for old structure with nested spans */
.classical-game-link .game-players {
    font-size: 15px;
    font-weight: 500;
    color: #1a1a1a;
    margin-bottom: 4px;
}

.classical-game-link .game-meta {
    font-size: 13px;
    color: #666;
}

.loading-games {
    font-size: 14px;
    color: #999;
    font-style: italic;
}

.no-games {
    font-size: 14px;
    color: #999;
    font-style: italic;
    margin: 0;
}

/* ==================== Print Styles ==================== */
@media print {
    .search-container,
    .view-board-btn,
    .board-section,
    .toc,
    .classical-games {
        display: none !important;
    }

    .learn-page {
        padding: 20px;
    }

    .lesson-card {
        break-inside: avoid;
        page-break-inside: avoid;
    }
}