/* ========================================
   特殊符号大全 - CSS Styles
   ======================================== */

/* CSS Variables */
:root {
    --primary: #1a1a2e;
    --secondary: #16213e;
    --accent: #e94560;
    --accent-light: #ff6b81;
    --accent-dark: #d63851;
    --background: #f8f9fa;
    --card-bg: #ffffff;
    --text-primary: #2d3436;
    --text-secondary: #636e72;
    --border: #dfe6e9;
    --success: #00b894;
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-4: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    --gradient-5: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    --shadow: 0 10px 40px rgba(26, 26, 46, 0.08);
    --shadow-hover: 0 20px 60px rgba(26, 26, 46, 0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--background);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========================================
   Header
   ======================================== */
.site-header {
    background: var(--card-bg);
    box-shadow: var(--shadow);
    padding: 40px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.logo-wrapper {
    text-align: center;
    flex: 1;
    min-width: 250px;
}

.logo {
    font-family: 'Noto Serif SC', serif;
    font-size: 2.8rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
    letter-spacing: 4px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 300;
    letter-spacing: 2px;
}

.stats {
    display: flex;
    gap: 24px;
    padding: 12px 24px;
    background: var(--background);
    border-radius: 50px;
    box-shadow: var(--shadow);
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.stat-number {
    font-weight: 700;
    color: var(--accent);
    font-size: 1.2rem;
}

/* ========================================
   Main Content
   ======================================== */
.main-content {
    min-height: calc(100vh - 200px);
    padding: 40px 0;
}

/* ========================================
   Search Section
   ======================================== */
.search-section {
    margin-bottom: 40px;
}

.search-container {
    max-width: 600px;
    margin: 0 auto;
    position: relative;
}

.search-box {
    width: 100%;
    padding: 18px 56px;
    font-size: 1.1rem;
    border: 2px solid var(--border);
    border-radius: 16px;
    background: var(--card-bg);
    transition: var(--transition);
    font-family: inherit;
    outline: none;
}

.search-box:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(233, 69, 96, 0.1);
}

.search-box::placeholder {
    color: var(--text-secondary);
}

.search-icon {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    width: 24px;
    height: 24px;
    color: var(--text-secondary);
    pointer-events: none;
}

.clear-btn {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    width: 28px;
    height: 28px;
    border: none;
    background: var(--background);
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: var(--transition);
}

.clear-btn:hover {
    background: var(--accent);
    color: white;
}

.clear-btn.visible {
    display: flex;
}

/* ========================================
   Section Titles
   ======================================== */
.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.section-icon {
    width: 28px;
    height: 28px;
    color: var(--accent);
}

.section-title::before {
    content: '';
    width: 4px;
    height: 28px;
    background: var(--accent);
    border-radius: 2px;
}

/* ========================================
   Popular Section
   ======================================== */
.popular-section {
    margin-bottom: 48px;
}

.popular-grid {
    display: grid;
    grid-template-columns: repeat(10, 1fr);
    gap: 16px;
}

.popular-card {
    aspect-ratio: 1;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
    background: var(--gradient-1);
}

.popular-card:nth-child(2n) {
    background: var(--gradient-2);
}

.popular-card:nth-child(3n) {
    background: var(--gradient-3);
}

.popular-card:nth-child(4n) {
    background: var(--gradient-4);
}

.popular-card:nth-child(5n) {
    background: var(--gradient-5);
}

.popular-card:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: var(--shadow-hover);
}

.popular-card .symbol-char {
    font-size: 2rem;
    color: white;
    transition: transform 0.3s ease;
}

.popular-card:hover .symbol-char {
    transform: scale(1.1);
}

.popular-card .symbol-name {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 6px;
    background: rgba(0, 0, 0, 0.3);
    color: white;
    font-size: 0.7rem;
    text-align: center;
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.popular-card:hover .symbol-name {
    transform: translateY(0);
}

/* ========================================
   Category Navigation
   ======================================== */
.category-nav {
    margin-bottom: 40px;
}

.category-tabs {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    padding: 8px 4px;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.category-tabs::-webkit-scrollbar {
    display: none;
}

.tab-btn {
    flex-shrink: 0;
    padding: 12px 24px;
    border: none;
    background: var(--card-bg);
    border-radius: 12px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: var(--shadow);
}

.tab-btn:hover {
    background: #f0f0f0;
    transform: translateY(-2px);
}

.tab-btn.active {
    background: var(--accent);
    color: white;
}

.tab-btn .count {
    padding: 4px 10px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    font-size: 0.85rem;
}

.tab-btn:not(.active) .count {
    background: var(--background);
    color: var(--text-secondary);
}

/* ========================================
   Symbols Grid
   ======================================== */
.symbols-section {
    margin-bottom: 60px;
}

.symbols-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 20px;
}

/* Symbol Card */
.symbol-card {
    aspect-ratio: 1;
    background: var(--card-bg);
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
    border: 2px solid transparent;
}

.symbol-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    border-color: var(--accent);
}

.symbol-card:active {
    transform: translateY(-2px);
}

.symbol-card .symbol-char {
    font-size: 2.5rem;
    color: var(--primary);
    transition: transform 0.3s ease;
}

.symbol-card:hover .symbol-char {
    transform: scale(1.1);
}

.symbol-card .symbol-name {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 10px;
    background: linear-gradient(transparent, rgba(233, 69, 96, 0.95));
    color: white;
    font-size: 0.8rem;
    text-align: center;
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.symbol-card:hover .symbol-name {
    transform: translateY(0);
}

.copy-overlay {
    position: absolute;
    inset: 0;
    background: var(--success);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1rem;
    font-weight: 600;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.copy-overlay.show {
    opacity: 1;
}

/* ========================================
   Empty State
   ======================================== */
.empty-state {
    text-align: center;
    padding: 80px 20px;
    display: none;
}

.empty-state.show {
    display: block;
}

.empty-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    color: var(--text-secondary);
    opacity: 0.5;
}

.empty-icon svg {
    width: 100%;
    height: 100%;
}

.empty-title {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.empty-text {
    color: var(--text-secondary);
}

/* ========================================
   Categories Info
   ======================================== */
.categories-info {
    margin-bottom: 60px;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}

.category-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 24px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.category-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 12px;
}

.category-card h3 {
    font-size: 1.1rem;
    color: var(--primary);
    margin-bottom: 8px;
}

.category-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ========================================
   Usage Guide
   ======================================== */
.usage-guide {
    margin-bottom: 60px;
}

.guide-content {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 32px;
    box-shadow: var(--shadow);
}

.guide-list {
    list-style: none;
    counter-reset: guide-counter;
}

.guide-list li {
    counter-increment: guide-counter;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

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

.guide-list li::before {
    content: counter(guide-counter);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--accent);
    color: white;
    border-radius: 50%;
    font-weight: 700;
    flex-shrink: 0;
}

.guide-list li strong {
    color: var(--primary);
}

/* ========================================
   Friends Section
   ======================================== */
.friends-section {
    margin-top: 60px;
    padding: 40px;
    background: var(--card-bg);
    border-radius: 20px;
    box-shadow: var(--shadow);
}

.friends-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 24px;
    text-align: center;
}

.friends-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 20px;
}

.friend-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 16px;
    background: var(--background);
    border-radius: 12px;
    text-decoration: none;
    transition: var(--transition);
}

.friend-link:hover {
    background: var(--accent);
    color: white;
    transform: translateY(-4px);
}

.friend-icon {
    width: 40px;
    height: 40px;
    margin-bottom: 10px;
    color: var(--accent);
}

.friend-icon svg {
    width: 100%;
    height: 100%;
}

.friend-link:hover .friend-icon {
    color: white;
}

.friend-name {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 4px;
}

.friend-link:hover .friend-name {
    color: white;
}

.friend-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-align: center;
}

.friend-link:hover .friend-desc {
    color: rgba(255, 255, 255, 0.8);
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
    background: var(--primary);
    color: white;
    padding: 40px 0;
    text-align: center;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.site-footer p {
    font-size: 0.95rem;
}

.site-footer a {
    color: var(--accent-light);
    text-decoration: none;
    transition: var(--transition);
}

.site-footer a:hover {
    text-decoration: underline;
}

.footer-nav {
    margin: 16px 0;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
}

.footer-divider {
    color: rgba(255, 255, 255, 0.3);
}

.copyright {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.6);
    margin-top: 16px;
}

/* ========================================
   Toast
   ======================================== */
.toast {
    position: fixed;
    top: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(-100px);
    background: var(--success);
    color: white;
    padding: 16px 32px;
    border-radius: 12px;
    font-weight: 500;
    box-shadow: 0 10px 40px rgba(0, 184, 148, 0.3);
    z-index: 1000;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    gap: 10px;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

.toast-icon {
    width: 24px;
    height: 24px;
}

/* ========================================
   Scroll Top Button
   ======================================== */
.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(233, 69, 96, 0.4);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 99;
}

.scroll-top.show {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    transform: translateY(-4px);
    background: var(--accent-dark);
}

.scroll-top svg {
    width: 24px;
    height: 24px;
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes ripple {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

.symbol-card,
.popular-card,
.category-card {
    animation: fadeIn 0.5s ease forwards;
}

.ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(233, 69, 96, 0.3);
    transform: scale(0);
    animation: ripple 0.6s linear;
    pointer-events: none;
}

/* ========================================
   Responsive Design
   ======================================== */

/* Large screens */
@media (max-width: 1400px) {
    .popular-grid {
        grid-template-columns: repeat(8, 1fr);
    }

    .symbols-grid {
        grid-template-columns: repeat(6, 1fr);
    }
}

/* Desktop */
@media (max-width: 1200px) {
    .popular-grid {
        grid-template-columns: repeat(6, 1fr);
    }

    .symbols-grid {
        grid-template-columns: repeat(5, 1fr);
    }

    .categories-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .friends-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Tablet */
@media (max-width: 992px) {
    .header-container {
        flex-direction: column;
        text-align: center;
    }

    .logo {
        font-size: 2.4rem;
    }

    .popular-grid {
        grid-template-columns: repeat(5, 1fr);
    }

    .symbols-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .categories-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .friends-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Mobile */
@media (max-width: 768px) {
    .site-header {
        padding: 24px 0;
    }

    .logo {
        font-size: 2rem;
    }

    .stats {
        gap: 16px;
        padding: 10px 20px;
    }

    .stat-item {
        font-size: 0.85rem;
    }

    .stat-number {
        font-size: 1rem;
    }

    .popular-grid {
        grid-template-columns: repeat(5, 1fr);
        gap: 12px;
    }

    .popular-card .symbol-char {
        font-size: 1.5rem;
    }

    .symbols-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 12px;
    }

    .symbol-card .symbol-char {
        font-size: 2rem;
    }

    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .category-card {
        padding: 20px;
    }

    .category-icon {
        font-size: 2rem;
    }

    .friends-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .section-title {
        font-size: 1.3rem;
    }

    .guide-content {
        padding: 24px;
    }

    .scroll-top {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .main-content {
        padding: 24px 0;
    }

    .logo {
        font-size: 1.8rem;
        letter-spacing: 2px;
    }

    .subtitle {
        font-size: 0.9rem;
    }

    .stats {
        flex-direction: column;
        gap: 8px;
    }

    .search-box {
        padding: 14px 48px;
        font-size: 1rem;
    }

    .popular-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 10px;
    }

    .symbols-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 10px;
    }

    .symbol-card {
        border-radius: 12px;
    }

    .symbol-card .symbol-char {
        font-size: 1.8rem;
    }

    .symbol-card .symbol-name {
        font-size: 0.7rem;
        padding: 6px;
    }

    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .friends-section {
        padding: 24px;
    }

    .friends-grid {
        gap: 12px;
    }

    .friend-link {
        padding: 16px 12px;
    }

    .friend-icon {
        width: 32px;
        height: 32px;
    }

    .tab-btn {
        padding: 10px 16px;
        font-size: 0.9rem;
    }
}

/* Print Styles */
@media print {
    .scroll-top,
    .toast,
    .search-section,
    .popular-section,
    .friends-section {
        display: none !important;
    }

    body {
        background: white;
        color: black;
    }

    .symbol-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

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

    html {
        scroll-behavior: auto;
    }
}