/**
 * 大衍筮法模拟工具 - 全局样式
 * 周易科普 · 拒绝迷信 · 哲学思辨
 */

/* ========== CSS Variables ========== */
:root {
    --color-ink: #2c2c2c;
    --color-copper: #d4a574;
    --color-paper: #f5f0e8;
    --color-ochre: #8b4513;
    --color-text: #3a3a3a;
    --color-light-ink: #5a5a5a;
    --color-divider: #e0d6c8;
    --color-hover: rgba(212, 165, 116, 0.15);
    --color-shadow: rgba(0, 0, 0, 0.08);
    
    --font-serif: "Noto Serif SC", "SimSun", "STSong", serif;
    --font-sans: "Noto Sans SC", "Microsoft YaHei", sans-serif;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    --border-radius: 4px;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-paper);
    color: var(--color-text);
    line-height: 1.8;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ========== Typography ========== */
h1, h2, h3, h4 {
    font-family: var(--font-serif);
    font-weight: 600;
    color: var(--color-ink);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--spacing-sm);
}

/* ========== Layout ========== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.page-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-xl) var(--spacing-md);
}

/* ========== Navigation ========== */
.nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--color-paper);
    border-top: 1px solid var(--color-divider);
    padding: var(--spacing-xs) 0;
    z-index: 100;
}

.nav-list {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    list-style: none;
}

.nav-link {
    font-family: var(--font-serif);
    color: var(--color-ink);
    text-decoration: none;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-copper);
    background: var(--color-hover);
}

/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: var(--font-serif);
    font-size: 1.1rem;
    color: var(--color-paper);
    background: var(--color-ink);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition-normal);
    text-decoration: none;
}

.btn:hover {
    background: var(--color-light-ink);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--color-shadow);
}

.btn:active {
    transform: translateY(0);
}

.btn-secondary {
    background: transparent;
    color: var(--color-ink);
    border: 2px solid var(--color-ink);
}

.btn-secondary:hover {
    background: var(--color-ink);
    color: var(--color-paper);
}

.btn-ghost {
    background: transparent;
    color: var(--color-copper);
    padding: var(--spacing-xs) var(--spacing-sm);
}

.btn-ghost:hover {
    background: var(--color-hover);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.25rem;
}

/* ========== Cards ========== */
.card {
    background: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: 0 2px 8px var(--color-shadow);
}

.card-header {
    border-bottom: 1px solid var(--color-divider);
    padding-bottom: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

/* ========== Hexagram Display ========== */
/* 强制卦象符号用文本字体渲染，防止浏览器把 ☰☱☲☳☴☵☶☷ 渲染成彩色 emoji */
.hexagram-symbol,
.bagua-symbol,
.gua-box-symbol,
.completion-symbol,
.hexagram-card .symbol,
.bagua-title .symbol,
.initial-1 .symbol,
.hexagram-item .symbol,
.guaya-pile-symbol,
.section-title .icon,
.card-title .icon {
    font-family: "Noto Serif SC", "SimSun", "STSong", "Songti SC", "Microsoft YaHei", serif, "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji";
    font-variant-emoji: text;
    -webkit-text-fill-color: currentColor;
    color: var(--color-ink);
    font-style: normal;
    font-weight: 400;
}

.hexagram-symbol {
    font-size: 4rem;
    line-height: 1.2;
    color: var(--color-ink);
    text-align: center;
    margin-bottom: var(--spacing-sm);
}

.hexagram-name {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    color: var(--color-ink);
    text-align: center;
}

.hexagram-detail {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
}

.hexagram-inner-outer {
    font-size: 0.9rem;
    color: var(--color-light-ink);
}

/* ========== Yin Yang Display ========== */
.yao-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) 0;
}

.yao-line {
    width: 60px;
    height: 6px;
    background: var(--color-ink);
    border-radius: 3px;
}

.yao-line.yin {
    background: transparent;
    border: 2px solid var(--color-ink);
    height: 2px;
    position: relative;
}

.yao-line.yin::after {
    content: '';
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 12px;
    height: 12px;
    background: var(--color-ink);
    border-radius: 50%;
}

.yao-line.yin::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 12px;
    height: 12px;
    background: var(--color-ink);
    border-radius: 50%;
}

.yao-title {
    font-family: var(--font-serif);
    font-size: 0.9rem;
    color: var(--color-copper);
    min-width: 50px;
}

.yao-text {
    font-size: 0.95rem;
    color: var(--color-text);
}

/* ========== Text Sections ========== */
.section {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-lg) 0;
}

.section-title {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    color: var(--color-ink);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.text-original {
    font-family: var(--font-serif);
    color: var(--color-ink);
    font-size: 1.1rem;
    line-height: 2;
}

.text-modern {
    color: var(--color-text);
    line-height: 1.8;
}

.text-philosophy {
    font-style: italic;
    color: var(--color-light-ink);
    padding: var(--spacing-md);
    background: var(--color-hover);
    border-left: 3px solid var(--color-copper);
    margin-top: var(--spacing-md);
}

/* ========== Form Elements ========== */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    font-family: var(--font-serif);
    color: var(--color-ink);
    margin-bottom: var(--spacing-xs);
}

.form-textarea {
    width: 100%;
    min-height: 120px;
    padding: var(--spacing-sm);
    font-family: var(--font-sans);
    font-size: 1rem;
    color: var(--color-text);
    background: white;
    border: 1px solid var(--color-divider);
    border-radius: var(--border-radius);
    resize: vertical;
    transition: var(--transition-fast);
}

.form-textarea:focus {
    outline: none;
    border-color: var(--color-copper);
    box-shadow: 0 0 0 3px var(--color-hover);
}

.form-textarea::placeholder {
    color: var(--color-light-ink);
}

/* ========== Divination Area ========== */
.divination-area {
    width: 100%;
    max-width: 600px;
    margin: 0 var(--spacing-lg);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    background: rgba(255, 255, 255, 0.5);
    border-radius: 8px;
    border: 2px dashed var(--color-divider);
    min-height: 300px;
    position: relative;
}

.divination-area.drag-over {
    border-color: var(--color-copper);
    background: var(--color-hover);
}

/* ========== Shi Cao (蓍草) ========== */
.shi-cao-container {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    justify-content: center;
    align-items: center;
    max-width: 200px;
}

.shi-cao {
    width: 6px;
    border-radius: 3px 3px 2px 2px;
    background: linear-gradient(to bottom, #7a9c59, #5d7a3d);
    box-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
    transition: var(--transition-fast);
}

.shi-cao:hover {
    transform: scale(1.1);
}

/* ========== Progress Indicator ========== */
.progress-bar {
    width: 100%;
    max-width: 400px;
    height: 8px;
    background: var(--color-divider);
    border-radius: 4px;
    overflow: hidden;
    margin: var(--spacing-md) 0;
}

.progress-fill {
    height: 100%;
    background: var(--color-copper);
    transition: width var(--transition-normal);
}

.progress-text {
    font-family: var(--font-serif);
    font-size: 0.9rem;
    color: var(--color-light-ink);
    text-align: center;
    margin-top: var(--spacing-xs);
}

/* ========== Status Messages ========== */
.status-message {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    color: var(--color-copper);
    text-align: center;
    padding: var(--spacing-md);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ========== AI Summary Block ========== */
#ai-summary-block,
#ai-full-summary-block {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, rgba(212, 165, 116, 0.1), rgba(139, 69, 19, 0.05));
    border: 1px solid var(--color-divider);
    border-radius: var(--border-radius);
    min-height: 100px;
}

#ai-summary-block h4,
#ai-full-summary-block h4 {
    font-family: var(--font-serif);
    color: var(--color-copper);
    margin-bottom: var(--spacing-sm);
}

/* ========== Grid Layouts ========== */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.grid-hexagrams {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: var(--spacing-sm);
}

.hexagram-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-sm);
    background: white;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition-fast);
    border: 1px solid var(--color-divider);
}

.hexagram-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px var(--color-shadow);
    border-color: var(--color-copper);
}

.hexagram-item .symbol {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
}

.hexagram-item .name {
    font-family: var(--font-serif);
    font-size: 0.9rem;
    color: var(--color-ink);
}

/* ========== Animations ========== */
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.animate-float {
    animation: float 3s ease-in-out infinite;
}

.animate-pulse {
    animation: pulse 2s ease-in-out infinite;
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .page-content {
        padding: var(--spacing-lg) var(--spacing-sm);
    }
    
    .grid-2 {
        grid-template-columns: 1fr;
    }
    
    .grid-hexagrams {
        grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
    }
    
    .hexagram-symbol {
        font-size: 3rem;
    }
    
    .nav-list {
        gap: var(--spacing-sm);
    }
}

/* ========== Utility Classes ========== */
.text-center { text-align: center; }
.text-copper { color: var(--color-copper); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.hidden { display: none !important; }

/* ========== 模式选择面板 ========== */
.mode-selector {
    width: 100%;
    max-width: 480px;
    margin: 0 auto var(--spacing-lg);
    padding: var(--spacing-xl) var(--spacing-lg);
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 20px var(--color-shadow);
    text-align: center;
}

.mode-selector-title {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    color: var(--color-ink);
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.mode-selector-title::before,
.mode-selector-title::after {
    content: '◇';
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-copper);
    font-size: 0.8rem;
}

.mode-selector-title::before {
    left: 10%;
}

.mode-selector-title::after {
    right: 10%;
}

.mode-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.mode-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: var(--spacing-lg) var(--spacing-md);
    background: linear-gradient(135deg, rgba(212, 165, 116, 0.08), rgba(139, 69, 19, 0.05));
    border: 2px solid var(--color-divider);
    border-radius: 10px;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.mode-btn:hover {
    border-color: var(--color-copper);
    background: linear-gradient(135deg, rgba(212, 165, 116, 0.15), rgba(139, 69, 19, 0.1));
    transform: translateY(-2px);
    box-shadow: 0 6px 16px var(--color-shadow);
}

.mode-btn-icon {
    font-size: 2rem;
    margin-bottom: 0.25rem;
}

.mode-btn-title {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    color: var(--color-ink);
}

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

.back-to-main-btn {
    display: block;
    width: 100%;
    margin-top: 1.5rem;
    padding: 0.5rem;
    background: none;
    border: none;
    font-size: 0.85rem;
    color: #aaa;
    cursor: pointer;
    text-align: center;
}
.back-to-main-btn:hover {
    color: var(--color-light-ink);
}

/* ========== 蓍草捆容器 ========== */
.stalk-bundle-container {
    width: 100%;
    max-width: 520px;
    margin: 0 auto;
    padding: var(--spacing-lg) 0 calc(var(--spacing-lg) + 56px);
}

.stalk-bundle {
    position: relative;
    width: 480px;
    min-height: 200px;
    height: auto;
    margin: 0 auto 56px;
    background: linear-gradient(180deg,
        rgba(139, 90, 43, 0.1) 0%,
        rgba(139, 90, 43, 0.05) 50%,
        rgba(139, 90, 43, 0.1) 100%);
    border-radius: 8px;
    border: 2px solid var(--color-divider);
    cursor: grab;
    user-select: none;
    overflow: visible;
}

.stalk-bundle:active {
    cursor: grabbing;
}

.stalk-bundle.dragging {
    cursor: grabbing;
}

/* 蓍草单根 */
.stalk {
    position: absolute;
    bottom: 10px;
    width: 3px;
    background: linear-gradient(to bottom, 
        #8fae6b 0%, 
        #6b8a4d 30%, 
        #4a6233 70%,
        #3d5229 100%);
    border-radius: 1.5px 1.5px 0 0;
    box-shadow: 
        1px 0 1px rgba(0, 0, 0, 0.1),
        inset 0 0 2px rgba(255, 255, 255, 0.2);
    transform-origin: bottom center;
    transition: transform 0.15s ease-out;
}

.stalk::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 6px;
    background: linear-gradient(to bottom, #a3c271, #7fa04e);
    border-radius: 1px;
}

/* 分割线 */
.split-line {
    position: absolute;
    top: 0;
    left: 50%;
    width: 3px;
    height: 100%;
    background: linear-gradient(to bottom,
        rgba(212, 165, 116, 0.3) 0%,
        var(--color-copper) 20%,
        var(--color-copper) 80%,
        rgba(212, 165, 116, 0.3) 100%);
    border-radius: 2px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
    box-shadow: 0 0 8px rgba(212, 165, 116, 0.5);
    z-index: 10;
}

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

/* 分堆结果显示 */
.split-result {
    text-align: center;
    font-family: var(--font-serif);
    font-size: 1.1rem;
    color: var(--color-ink);
    margin-bottom: var(--spacing-sm);
    opacity: 0;
    transition: opacity 0.3s ease;
    height: 1.5em;
}

.split-result.visible {
    opacity: 1;
}

.split-result .count {
    color: var(--color-copper);
    font-weight: 600;
}

.split-result .divider {
    color: var(--color-light-ink);
    margin: 0 0.75rem;
}

/* 余数浮窗 */
.remainder-popup {
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid var(--color-copper);
    border-radius: 10px;
    padding: var(--spacing-sm) var(--spacing-md);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
    z-index: 100;
    min-width: 220px;
}

.remainder-popup.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(-5px);
}

.remainder-popup::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    border: 8px solid transparent;
    border-top-color: rgba(255, 255, 255, 0.95);
}

.remainder-popup-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.3rem 0;
    font-size: 0.9rem;
}

.remainder-popup-row:not(:last-child) {
    border-bottom: 1px dashed var(--color-divider);
}

.remainder-popup-label {
    color: var(--color-light-ink);
}

.remainder-popup-value {
    font-family: var(--font-serif);
    color: var(--color-ink);
    font-weight: 600;
}

.remainder-popup-value.highlight {
    color: var(--color-copper);
}

.remainder-popup-value.discard {
    color: var(--color-ochre);
}

.remainder-popup-value.remaining {
    color: #5d8a3e;
}

/* 第一变动画 - 抽一 */
.guaya-pile {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    background: linear-gradient(135deg, rgba(212, 165, 116, 0.1), rgba(139, 69, 19, 0.05));
    border: 1px solid var(--color-copper);
    border-radius: 10px;
    margin-bottom: var(--spacing-md);
}

.guaya-pile-label {
    font-family: var(--font-serif);
    font-size: 0.85rem;
    color: var(--color-copper);
}

.guaya-pile-symbol {
    font-size: 2.5rem;
    color: var(--color-copper);
    animation: fadeInUp 0.5s ease;
}

/* Toast 提示 */
.toast {
    position: fixed;
    top: 20%;
    left: 50%;
    transform: translateX(-50%) translateY(-20px);
    background: white;
    border: 2px solid var(--color-copper);
    border-radius: 10px;
    padding: var(--spacing-sm) var(--spacing-lg);
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.2);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
    z-index: 1000;
    font-family: var(--font-serif);
    font-size: 1.1rem;
    color: var(--color-ink);
    text-align: center;
}

.toast.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast .yao-name {
    color: var(--color-copper);
    font-weight: 600;
}

/* 快速随机处理中动画 */
.quick-processing {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 2000;
}

.quick-processing.visible {
    opacity: 1;
    pointer-events: auto;
}

.quick-processing-text {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    color: white;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.quick-processing-stalks {
    display: flex;
    gap: 3px;
}

.quick-processing-stalk {
    width: 4px;
    height: 40px;
    background: linear-gradient(to bottom, #8fae6b, #4a6233);
    border-radius: 2px;
    animation: quickStalk 0.6s ease-in-out infinite;
}

.quick-processing-stalk:nth-child(2) { animation-delay: 0.1s; }
.quick-processing-stalk:nth-child(3) { animation-delay: 0.2s; }
.quick-processing-stalk:nth-child(4) { animation-delay: 0.3s; }
.quick-processing-stalk:nth-child(5) { animation-delay: 0.4s; }

@keyframes quickStalk {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-15px) rotate(5deg); }
}

/* ========== 响应式调整 ========== */
@media (max-width: 768px) {
    .stalk-bundle {
        width: 95%;
        max-width: 400px;
        min-height: 220px;
        height: auto;
        margin: 0 auto 52px;
        overflow: visible;
    }
    
    .mode-selector {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .mode-btn {
        padding: var(--spacing-md);
    }
    
    .remainder-popup {
        min-width: 180px;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
}