/* ========== 围棋坐标转换器 — 页面专属样式 ========== */
/* 版本: 1.0.0 | 栏目: 工具资源/围棋 | 作者: 芦笛 */

/* ===== 页面头部基础样式（补充） ===== */
.page-header {
    position: relative;
    min-height: 65vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.02'%3E%3Cpath d='M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM12 60c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    pointer-events: none;
}

.page-header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 100px;
    background: var(--color-cream);
    clip-path: ellipse(70% 100% at 50% 100%);
}

.page-header-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: white;
    padding: var(--space-xl) var(--space-md) var(--space-lg);
    max-width: 800px;
}

.page-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 900;
    margin-bottom: var(--space-sm);
    letter-spacing: 12px;
    text-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.page-subtitle {
    font-size: 1.05rem;
    opacity: 0.75;
    max-width: 560px;
    margin: 0 auto;
    line-height: 2;
    font-weight: 300;
    letter-spacing: 1px;
}

.page-header-deco {
    position: absolute;
    width: 200px;
    height: 200px;
    border: 1px solid rgba(196, 167, 125, 0.15);
    border-radius: 50%;
    pointer-events: none;
}

.page-header-deco:nth-child(1) {
    top: 10%;
    left: 5%;
    width: 150px;
    height: 150px;
    animation: spin-slow 60s linear infinite;
}

.page-header-deco:nth-child(2) {
    bottom: 15%;
    right: 8%;
    width: 100px;
    height: 100px;
    animation: spin-slow 45s linear infinite reverse;
}

.page-header-deco:nth-child(3) {
    top: 30%;
    right: 15%;
    width: 60px;
    height: 60px;
    border-color: rgba(196, 167, 125, 0.1);
    animation: spin-slow 30s linear infinite;
}

/* ===== 面包屑导航 ===== */
.breadcrumb-wrap {
    background: var(--color-cream);
    padding: var(--space-sm) 0;
    border-bottom: 1px solid rgba(30, 30, 36, 0.04);
}

.breadcrumb-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* ===== 栏目专属色变量 ===== */
:root {
    --color-go-primary: #5A6D7B;
    --color-go-dark: #3A4F5C;
    --color-go-light: #7A8D9B;
    --color-go-accent: #6B8B8A;
    --color-board-bg: #E8DCC8;
    --color-board-line: #5A5652;
    --color-black-stone: #1E1E24;
    --color-white-stone: #F5F5F0;
    --color-star-mark: #5A5652;
}

/* ===== 页面头部（围棋栏目色） ===== */
.go-header {
    background: linear-gradient(135deg, #5A6D7B, #3A4F5C, #4A5D6B, #3A4F5C);
    background-size: 400% 400%;
    animation: gradient-shift 15s ease infinite;
}

.go-header::after {
    background: var(--color-cream);
}

.page-tag {
    display: inline-block;
    padding: 0.4rem 1.2rem;
    background: rgba(255,255,255,0.12);
    color: rgba(255,255,255,0.9);
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 3px;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-sm);
    backdrop-filter: blur(8px);
}

/* ===== 面包屑导航 ===== */
.breadcrumb-wrap {
    background: var(--color-cream);
    padding: var(--space-sm) 0;
    border-bottom: 1px solid rgba(30, 30, 36, 0.04);
}

.breadcrumb-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* ===== 工具主界面区 ===== */
.tool-main-section {
    padding: var(--space-2xl) var(--space-md);
    background: var(--color-cream);
}

.tool-main-container {
    max-width: 1200px;
    margin: 0 auto;
}

.tool-workspace {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: var(--space-xl);
    margin-top: var(--space-lg);
    align-items: start;
}

@media (max-width: 1024px) {
    .tool-workspace {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
}

/* ===== 控制面板 ===== */
.control-panel {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(30, 30, 36, 0.04);
    position: sticky;
    top: 90px;
}

.control-group {
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid rgba(30, 30, 36, 0.04);
}

.control-group:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.control-label {
    display: block;
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: var(--space-sm);
    letter-spacing: 1px;
}

/* 棋盘路数选择器 */
.board-size-selector,
.coord-rule-selector {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.size-btn,
.rule-btn {
    padding: 0.5rem 1rem;
    border: 1.5px solid rgba(90, 109, 123, 0.2);
    background: white;
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-warm-gray);
    cursor: pointer;
    transition: var(--transition-fast);
    font-family: var(--font-body);
}

.size-btn:hover,
.rule-btn:hover {
    border-color: var(--color-go-primary);
    color: var(--color-go-primary);
}

.size-btn.active,
.rule-btn.active {
    background: var(--color-go-primary);
    color: white;
    border-color: var(--color-go-primary);
    box-shadow: var(--shadow-sm);
}

/* 坐标输入 */
.coord-input-wrap {
    display: flex;
    gap: 8px;
}

#coordInput {
    flex: 1;
    padding: 0.7rem 1rem;
    border: 1.5px solid rgba(30, 30, 36, 0.1);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-family: var(--font-body);
    transition: var(--transition-fast);
    outline: none;
}

#coordInput:focus {
    border-color: var(--color-go-primary);
    box-shadow: 0 0 0 3px rgba(90, 109, 123, 0.1);
}

.input-hint {
    font-size: 0.75rem;
    color: var(--color-warm-gray);
    margin-top: 6px;
    font-weight: 300;
}

/* 操作按钮 */
.action-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
}

/* 当前坐标显示 */
.current-coord-group {
    background: rgba(90, 109, 123, 0.03);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin-top: var(--space-sm);
}

.coord-display {
    display: grid;
    gap: 8px;
}

.coord-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 10px;
    background: white;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
}

.coord-label {
    color: var(--color-warm-gray);
    font-weight: 400;
}

.coord-value {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--color-go-primary);
    font-size: 0.9rem;
}

/* ===== 棋盘面板 ===== */
.board-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.board-wrap {
    position: relative;
    background: var(--color-board-bg);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-lg);
    border: 3px solid #D4C4A8;
}

#goBoard {
    display: block;
    cursor: crosshair;
    border-radius: 4px;
}

.board-overlay {
    position: absolute;
    top: 20px;
    left: 20px;
    pointer-events: none;
}

.board-info {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-md);
    font-size: 0.85rem;
    color: var(--color-warm-gray);
}

.board-info span {
    padding: 4px 12px;
    background: white;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-sm);
}

/* ===== 坐标规则详解区 ===== */
.rules-section {
    padding: var(--space-2xl) var(--space-md);
    background: white;
}

.rules-container {
    max-width: 1200px;
    margin: 0 auto;
}

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

@media (max-width: 968px) {
    .rules-grid {
        grid-template-columns: 1fr;
    }
}

.rule-card {
    background: var(--color-cream);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    border: 1px solid rgba(30, 30, 36, 0.04);
    transition: var(--transition-normal);
}

.rule-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.rule-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid rgba(90, 109, 123, 0.1);
}

.rule-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--color-go-primary), var(--color-go-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    flex-shrink: 0;
}

.rule-name {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-dark);
    letter-spacing: 1px;
}

.rule-name-en {
    font-size: 0.7rem;
    color: var(--color-warm-gray);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.rule-desc {
    font-size: 0.88rem;
    color: var(--color-warm-gray);
    line-height: 1.9;
    margin-bottom: var(--space-md);
    font-weight: 300;
}

.rule-example {
    background: white;
    border-radius: var(--radius-md);
    padding: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.example-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-go-primary);
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.example-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 0;
    border-bottom: 1px solid rgba(30, 30, 36, 0.04);
    font-size: 0.85rem;
}

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

.ex-coord {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--color-go-primary);
    background: rgba(90, 109, 123, 0.08);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
}

.ex-desc {
    color: var(--color-warm-gray);
    font-size: 0.8rem;
    font-weight: 300;
}

.rule-note {
    font-size: 0.8rem;
    color: var(--color-warm-gray);
    line-height: 1.7;
    padding: var(--space-sm);
    background: rgba(196, 167, 125, 0.08);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--color-accent);
}

.rule-note strong {
    color: var(--color-dark);
}

/* ===== SGF格式区 ===== */
.sgf-section {
    padding: var(--space-2xl) var(--space-md);
    background: linear-gradient(180deg, var(--color-cream) 0%, white 50%, var(--color-cream) 100%);
}

.sgf-container {
    max-width: 1200px;
    margin: 0 auto;
}

.sgf-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: var(--space-xl);
    margin-top: var(--space-lg);
    align-items: start;
}

@media (max-width: 968px) {
    .sgf-content {
        grid-template-columns: 1fr;
    }
}

.sgf-text h3 {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--space-sm);
    letter-spacing: 1px;
}

.sgf-text p {
    font-size: 0.95rem;
    color: var(--color-warm-gray);
    line-height: 2;
    margin-bottom: var(--space-md);
    font-weight: 300;
}

.sgf-text code {
    font-family: var(--font-mono);
    background: rgba(90, 109, 123, 0.08);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--color-go-primary);
    font-size: 0.9em;
}

.sgf-code-block {
    background: #1E1E24;
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin: var(--space-md) 0;
    box-shadow: var(--shadow-lg);
}

.code-header {
    background: rgba(255,255,255,0.05);
    padding: 10px 16px;
    font-size: 0.8rem;
    color: rgba(255,255,255,0.6);
    font-weight: 500;
    letter-spacing: 1px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.sgf-code-block pre {
    padding: var(--space-md);
    margin: 0;
    overflow-x: auto;
}

.sgf-code-block code {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: #C4A77D;
    background: none;
    padding: 0;
    line-height: 1.6;
}

.code-explain {
    padding: var(--space-sm) var(--space-md);
    background: rgba(255,255,255,0.02);
    border-top: 1px solid rgba(255,255,255,0.05);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.code-explain span {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.5);
    line-height: 1.6;
}

.code-explain strong {
    color: rgba(255,255,255,0.8);
}

.sgf-keypoints {
    margin-top: var(--space-md);
}

.sgf-keypoints h4 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: var(--space-sm);
    letter-spacing: 1px;
}

.sgf-keypoints ul {
    list-style: none;
}

.sgf-keypoints li {
    font-size: 0.88rem;
    color: var(--color-warm-gray);
    line-height: 2.2;
    padding-left: var(--space-md);
    position: relative;
    font-weight: 300;
}

.sgf-keypoints li::before {
    content: '◆';
    position: absolute;
    left: 0;
    color: var(--color-go-accent);
    font-size: 0.5rem;
    top: 2px;
}

.sgf-keypoints li strong {
    color: var(--color-dark);
    font-weight: 600;
}

.sgf-visual {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

#sgfDemoCanvas {
    width: 100%;
    max-width: 360px;
    aspect-ratio: 1;
    background: var(--color-board-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 3px solid #D4C4A8;
}

.visual-caption {
    margin-top: var(--space-sm);
    font-size: 0.8rem;
    color: var(--color-warm-gray);
    text-align: center;
    font-weight: 300;
}

/* ===== 星位与重要点区 ===== */
.starpoints-section {
    padding: var(--space-2xl) var(--space-md);
    background: white;
}

.starpoints-container {
    max-width: 1200px;
    margin: 0 auto;
}

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

@media (max-width: 968px) {
    .starpoints-grid {
        grid-template-columns: 1fr;
    }
}

.starpoint-card {
    background: var(--color-cream);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid rgba(30, 30, 36, 0.04);
    transition: var(--transition-normal);
}

.starpoint-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.sp-preview {
    background: var(--color-board-bg);
    padding: 20px;
    display: flex;
    justify-content: center;
    border-bottom: 2px solid #D4C4A8;
}

.sp-preview canvas {
    width: 100%;
    max-width: 240px;
    aspect-ratio: 1;
}

.sp-info {
    padding: var(--space-md) var(--space-lg);
}

.sp-info h4 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.sp-info p {
    font-size: 0.85rem;
    color: var(--color-warm-gray);
    line-height: 1.8;
    margin-bottom: var(--space-sm);
    font-weight: 300;
}

.sp-coords {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.sp-tag {
    display: inline-block;
    padding: 3px 10px;
    background: rgba(90, 109, 123, 0.08);
    color: var(--color-go-primary);
    font-size: 0.75rem;
    border-radius: var(--radius-full);
    font-weight: 500;
    font-family: var(--font-mono);
}

/* 术语对照表 */
.terminology-table-wrap {
    margin-top: var(--space-xl);
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(30, 30, 36, 0.04);
}

.table-title {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--space-md);
    letter-spacing: 1px;
    text-align: center;
}

.table-responsive {
    overflow-x: auto;
}

.terminology-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.terminology-table th {
    background: var(--color-go-primary);
    color: white;
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.terminology-table th:first-child {
    border-radius: var(--radius-sm) 0 0 0;
}

.terminology-table th:last-child {
    border-radius: 0 var(--radius-sm) 0 0;
}

.terminology-table td {
    padding: 10px 16px;
    border-bottom: 1px solid rgba(30, 30, 36, 0.04);
    color: var(--color-warm-gray);
    font-weight: 300;
    line-height: 1.5;
}

.terminology-table tr:hover td {
    background: rgba(90, 109, 123, 0.03);
}

.terminology-table td:first-child {
    font-weight: 600;
    color: var(--color-dark);
    white-space: nowrap;
}

.terminology-table td:nth-child(2) {
    font-family: var(--font-mono);
    font-size: 0.8rem;
}

/* ===== 定式示例区 ===== */
.joseki-section {
    padding: var(--space-2xl) var(--space-md);
    background: linear-gradient(180deg, var(--color-cream) 0%, white 50%, var(--color-cream) 100%);
}

.joseki-container {
    max-width: 1200px;
    margin: 0 auto;
}

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

@media (max-width: 968px) {
    .joseki-grid {
        grid-template-columns: 1fr;
    }
}

.joseki-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(30, 30, 36, 0.04);
    transition: var(--transition-normal);
}

.joseki-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.joseki-board {
    background: var(--color-board-bg);
    padding: 20px;
    display: flex;
    justify-content: center;
    border-bottom: 2px solid #D4C4A8;
}

.joseki-board canvas {
    width: 100%;
    max-width: 220px;
    aspect-ratio: 1;
}

.joseki-info {
    padding: var(--space-md) var(--space-lg);
}

.joseki-info h4 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 6px;
    letter-spacing: 1px;
}

.joseki-desc {
    font-size: 0.82rem;
    color: var(--color-warm-gray);
    line-height: 1.7;
    margin-bottom: var(--space-sm);
    font-weight: 300;
}

.joseki-moves {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.move-step {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 8px;
    background: rgba(90, 109, 123, 0.04);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
}

.move-num {
    width: 20px;
    height: 20px;
    border-radius: var(--radius-full);
    background: var(--color-go-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 600;
    flex-shrink: 0;
}

.move-coord {
    font-family: var(--font-mono);
    color: var(--color-dark);
    font-weight: 500;
}

/* ===== 速查表区 ===== */
.lookup-section {
    padding: var(--space-2xl) var(--space-md);
    background: white;
}

.lookup-container {
    max-width: 800px;
    margin: 0 auto;
}

.lookup-table-wrap {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(30, 30, 36, 0.04);
    margin-top: var(--space-lg);
}

.table-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: var(--space-md);
    border-bottom: 2px solid rgba(30, 30, 36, 0.04);
    padding-bottom: var(--space-sm);
}

.tab-btn {
    padding: 0.6rem 1.2rem;
    border: none;
    background: none;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-warm-gray);
    cursor: pointer;
    transition: var(--transition-fast);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    position: relative;
}

.tab-btn:hover {
    color: var(--color-go-primary);
    background: rgba(90, 109, 123, 0.04);
}

.tab-btn.active {
    color: var(--color-go-primary);
    background: rgba(90, 109, 123, 0.08);
    font-weight: 600;
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 20%;
    right: 20%;
    height: 2px;
    background: var(--color-go-primary);
    border-radius: 2px;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeInUp 0.4s ease;
}

.lookup-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.lookup-table th {
    background: var(--color-go-primary);
    color: white;
    padding: 10px 14px;
    text-align: center;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.lookup-table th:first-child {
    border-radius: var(--radius-sm) 0 0 0;
}

.lookup-table th:last-child {
    border-radius: 0 var(--radius-sm) 0 0;
}

.lookup-table td {
    padding: 8px 14px;
    text-align: center;
    border-bottom: 1px solid rgba(30, 30, 36, 0.04);
    color: var(--color-warm-gray);
    font-weight: 300;
    font-family: var(--font-mono);
}

.lookup-table tr:nth-child(even) td {
    background: rgba(90, 109, 123, 0.02);
}

.lookup-table tr:hover td {
    background: rgba(90, 109, 123, 0.05);
}

.lookup-table td:first-child {
    font-weight: 600;
    color: var(--color-dark);
}

/* ===== 技术规格区 ===== */
.specs-section {
    padding: var(--space-2xl) var(--space-md);
    background: var(--color-cream);
}

.specs-container {
    max-width: 1200px;
    margin: 0 auto;
}

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

@media (max-width: 968px) {
    .specs-grid {
        grid-template-columns: 1fr;
    }
}

.spec-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(30, 30, 36, 0.04);
}

.spec-card h4 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: var(--space-sm);
    letter-spacing: 1px;
}

.spec-card ul {
    list-style: none;
}

.spec-card li {
    font-size: 0.85rem;
    color: var(--color-warm-gray);
    line-height: 2;
    padding-left: var(--space-sm);
    position: relative;
    font-weight: 300;
}

.spec-card li::before {
    content: '◆';
    position: absolute;
    left: 0;
    color: var(--color-go-accent);
    font-size: 0.5rem;
    top: 2px;
}

/* ===== CTA 区 ===== */
.cta-section {
    padding: var(--space-2xl) var(--space-md);
    background: linear-gradient(135deg, var(--color-go-dark), #3A4F5C, var(--color-go-primary));
    background-size: 400% 400%;
    animation: gradient-shift 15s ease infinite;
    text-align: center;
    color: white;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.02'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.cta-content {
    position: relative;
    z-index: 1;
    max-width: 600px;
    margin: 0 auto;
}

.cta-title {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 3.5vw, 2.6rem);
    font-weight: 700;
    margin-bottom: var(--space-sm);
    letter-spacing: 3px;
}

.cta-desc {
    font-size: 1rem;
    opacity: 0.7;
    margin-bottom: var(--space-lg);
    font-weight: 300;
    line-height: 1.9;
}

.cta-buttons {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== 动画关键帧补充 ===== */
@keyframes gradient-shift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

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

/* ===== 响应式补充 ===== */
@media (max-width: 768px) {
    .page-title {
        letter-spacing: 6px;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .cta-buttons .btn {
        width: 100%;
        max-width: 280px;
    }

    .control-panel {
        position: static;
    }

    .board-wrap {
        padding: 12px;
    }

    .terminology-table {
        font-size: 0.75rem;
    }

    .terminology-table th,
    .terminology-table td {
        padding: 8px 10px;
    }

    .lookup-table {
        font-size: 0.8rem;
    }

    .lookup-table th,
    .lookup-table td {
        padding: 6px 8px;
    }
}

/* ===== 卡片 stagger 动画 ===== */
.category-card, .rule-card, .starpoint-card, .joseki-card, .spec-card, .quick-tool-card, .featured-card {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease, box-shadow 0.4s ease, border-color 0.3s ease;
}

.category-card.visible, .rule-card.visible, .starpoint-card.visible, .joseki-card.visible, .spec-card.visible, .quick-tool-card.visible, .featured-card.visible {
    opacity: 1;
    transform: translateY(0);
}