/* ============================================================
   提示词工坊 (Prompt Workshop) - 主样式
   基于 Figma 设计稿实现深色主题 UI
   ============================================================ */

/* --- Tailwind CSS via CDN --- */
@import url('https://cdn.jsdelivr.net/npm/tailwindcss@2.2.19/dist/tailwind.min.css');

/* ============================================================
   设计变量
   ============================================================ */
:root {
    /* 品牌色 - 紫色到绿色渐变 */
    --primary-from: #6D28D9;
    --primary-mid-1: #6939D2;
    --primary-mid-2: #6646CB;
    --primary-mid-3: #6152C2;
    --primary-mid-4: #5D5CBB;
    --primary-mid-5: #5864B3;
    --primary-mid-6: #536CAB;
    --primary-mid-7: #4D73A2;
    --primary-mid-8: #47799A;
    --primary-mid-9: #408091;
    --primary-mid-10: #378688;
    --primary-mid-11: #2D8B7E;
    --primary-mid-12: #1F9174;
    --primary-to: #059669;
    --brand-gradient: linear-gradient(135deg, var(--primary-from) 0%, var(--primary-to) 100%);
    --brand-gradient-horizontal: linear-gradient(90deg, var(--primary-from) 0%, var(--primary-to) 100%);

    /* 橙色 PRO 色 */
    --pro-from: #FE9A00;
    --pro-to: #FF6900;
    --pro-gradient: linear-gradient(90deg, var(--pro-from) 0%, var(--pro-to) 100%);

    /* 标题渐变 */
    --title-gradient: linear-gradient(180deg, rgba(109,40,217,1) 0%, rgba(102,70,203,1) 7%, rgba(94,89,189,1) 14%, rgba(85,105,174,1) 21%, rgba(74,118,159,1) 29%, rgba(61,129,142,1) 36%, rgba(43,140,125,1) 43%, rgba(5,150,105,1) 50%, rgba(84,145,97,1) 57%, rgba(120,140,88,1) 64%, rgba(147,133,78,1) 71%, rgba(172,125,68,1) 79%, rgba(194,116,55,1) 86%, rgba(214,104,40,1) 93%, rgba(234,88,12,1) 100%);

    /* 背景色 */
    --bg-primary: #0F0F0F;
    --bg-card: rgba(255,255,255,0.04);
    --bg-hover: rgba(255,255,255,0.06);
    --bg-nav: rgba(15,15,15,0.60);
    --bg-footer: rgba(255,255,255,0.02);

    /* 边框色 */
    --border-subtle: rgba(255,255,255,0.04);
    --border-light: rgba(255,255,255,0.05);
    --border-medium: rgba(255,255,255,0.10);

    /* 文本色 */
    --text-primary: #FFFFFF;
    --text-secondary: rgba(255,255,255,0.60);
    --text-tertiary: rgba(255,255,255,0.40);

    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;

    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* 字体 */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-md: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-hero: 48px;

    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;
    --transition-slow: 0.3s ease;

    /* 阴影 */
    --shadow-card: 0 2px 8px rgba(0,0,0,0.2);

    /* 布局 */
    --content-width: 1470px;
    --nav-height: 65px;
}

/* ============================================================
   全局重置
   ============================================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    border: none;
    cursor: pointer;
    font-family: inherit;
    background: none;
}

input {
    border: none;
    outline: none;
    font-family: inherit;
    background: none;
}

/* ============================================================
   导航栏
   ============================================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: var(--bg-nav);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-subtle);
    z-index: 1000;
}

.nav-inner {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 40px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: var(--brand-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.logo-text-icon {
    color: white;
    font-size: var(--font-size-md);
    font-weight: 600;
}

.logo-name {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav-item {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    padding: 4px 0;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-item:hover,
.nav-item.active {
    color: var(--text-primary);
}

.nav-item.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--text-primary);
    border-radius: 1px;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-icon-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    position: relative;
    transition: background var(--transition-fast);
}

.nav-icon-btn:hover {
    background: rgba(255,255,255,0.05);
}

.notif-dot {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 6px;
    height: 6px;
    background: var(--pro-to);
    border-radius: 50%;
    border: 1.5px solid var(--bg-primary);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 8px 4px 4px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.user-profile:hover {
    background: rgba(255,255,255,0.05);
}

.avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    overflow: hidden;
    flex-shrink: 0;
}

.pro-badge {
    display: inline-block;
    padding: 2px 8px;
    background: var(--pro-gradient);
    border-radius: var(--radius-sm);
    color: white;
    font-size: var(--font-size-xs);
    font-weight: 600;
    line-height: 1.5;
}

.chevron-down {
    flex-shrink: 0;
}

/* ============================================================
   英雄区
   ============================================================ */
.hero {
    position: relative;
    padding-top: var(--nav-height);
    height: 364px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-glow {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: linear-gradient(180deg, rgba(109,40,217,0.05) 0%, rgba(0,0,0,0) 100%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 768px;
    width: 100%;
    padding: 0 20px;
}

.hero-title {
    margin-bottom: 0;
}

.gradient-text {
    font-size: var(--font-size-hero);
    font-weight: 700;
    background: var(--title-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    margin-top: 14px;
    margin-bottom: 0;
}

.hero-search {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-top: 28px;
}

.search-box {
    position: relative;
    width: 540px;
    height: 48px;
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
}

.search-input {
    width: 100%;
    height: 100%;
    padding: 0 16px 0 41px;
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    transition: border-color var(--transition-normal), background var(--transition-normal);
}

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

.search-input:focus {
    border-color: var(--primary-from);
    background: rgba(255,255,255,0.04);
}

.btn-create {
    display: flex;
    align-items: center;
    gap: 8px;
    height: 40px;
    padding: 0 24px;
    background: var(--brand-gradient-horizontal);
    border-radius: var(--radius-lg);
    color: white;
    font-size: var(--font-size-sm);
    font-weight: 600;
    white-space: nowrap;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.btn-create:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

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

/* ============================================================
   内容区
   ============================================================ */
.content {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 var(--spacing-xl) 60px;
    margin-top: 48px;
}

.content-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    gap: 20px;
    flex-wrap: wrap;
}

/* 分类标签 */
.category-tabs {
    display: flex;
    align-items: center;
    gap: 3px;
    padding: 3.5px;
    background: rgba(255,255,255,0.10);
    border-radius: var(--radius-lg);
}

.category-tab {
    display: flex;
    align-items: center;
    gap: 6px;
    height: 29px;
    padding: 0 12px;
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    position: relative;
}

.category-tab svg {
    flex-shrink: 0;
}

.category-tab:hover {
    color: var(--text-primary);
    background: rgba(255,255,255,0.03);
}

.category-tab.active {
    background: rgba(255,255,255,0.02);
    color: var(--text-primary);
    box-shadow: inset 0 0 0 1px var(--border-light);
}

/* 筛选栏 */
.filter-bar {
    display: flex;
    align-items: center;
    gap: 12px;
}

.sort-select {
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
    height: 36px;
    padding: 0 14px;
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: border-color var(--transition-fast);
    user-select: none;
}

.sort-select:hover {
    border-color: var(--border-medium);
}

.sort-text {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
}

.sort-dropdown {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    background: rgba(30,30,30,0.95);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition: all var(--transition-fast);
    z-index: 10;
}

.sort-select.open .sort-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.sort-option {
    padding: 8px 14px;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.sort-option:hover,
.sort-option.active {
    color: var(--text-primary);
    background: rgba(255,255,255,0.05);
}

/* 仅免费切换 */
.free-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    height: 36px;
    padding: 0 12px;
    background: rgba(255,255,255,0.05);
    border-radius: var(--radius-md);
    cursor: pointer;
    user-select: none;
}

.toggle-track {
    position: relative;
    width: 32px;
    height: 18.39px;
    background: rgba(255,255,255,0.04);
    border-radius: var(--radius-full);
    border: 1px solid rgba(0,0,0,0);
    transition: background var(--transition-normal);
    flex-shrink: 0;
}

.free-toggle.active .toggle-track {
    background: rgba(5,150,105,0.5);
    border-color: var(--primary-to);
}

.toggle-thumb {
    position: absolute;
    top: 1.2px;
    left: 1px;
    width: 14px;
    height: 14px;
    background: rgba(255,255,255,0.6);
    border-radius: 50%;
    transition: transform var(--transition-normal), background var(--transition-normal);
}

.free-toggle.active .toggle-thumb {
    transform: translateX(14px);
    background: white;
}

.toggle-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
}

/* ============================================================
   提示词卡片网格
   ============================================================ */
.prompts-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-top: 24px;
}

/* 卡片 */
.prompt-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-slow);
    cursor: pointer;
}

.prompt-card:hover {
    border-color: var(--border-medium);
    background: var(--bg-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
}

.card-image {
    width: calc(100% + 2px);
    height: 195.47px;
    margin: -1px -1px 0;
    background: rgba(255,255,255,0.10);
    overflow: hidden;
    position: relative;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.prompt-card:hover .card-image img {
    transform: scale(1.05);
}

.card-body {
    padding: 16px;
    position: relative;
}

.card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 4px;
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
}

.card-tag {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    background: transparent;
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    flex-shrink: 0;
}

.card-desc {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 8px;
    min-height: 40px;
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-stats {
    display: flex;
    align-items: center;
    gap: 16px;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.stat-item svg {
    flex-shrink: 0;
}

.stat-item.liked svg path {
    fill: #f87171;
    stroke: #f87171;
}

.btn-copy {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    font-weight: 600;
    transition: background var(--transition-fast);
}

.btn-copy:hover {
    background: rgba(255,255,255,0.08);
}

.btn-copy:active {
    background: rgba(255,255,255,0.12);
}

/* PRO 标签 */
.card-pro-badge {
    position: absolute;
    top: 13px;
    right: 13px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    background: var(--pro-gradient);
    border-radius: var(--radius-sm);
    color: white;
    font-size: var(--font-size-xs);
    font-weight: 600;
    z-index: 2;
}

/* ============================================================
   加载更多
   ============================================================ */
.load-more {
    text-align: center;
    margin-top: 40px;
}

.btn-load-more {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 32px;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    font-weight: 600;
    transition: all var(--transition-fast);
}

.btn-load-more:hover {
    background: rgba(255,255,255,0.08);
    border-color: var(--border-medium);
}

.btn-load-more.hidden {
    display: none;
}

/* ============================================================
   加载状态
   ============================================================ */
.loading-spinner {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    margin-top: 60px;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.loading-spinner.visible {
    display: flex;
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid rgba(255,255,255,0.08);
    border-top-color: var(--primary-from);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================================================
   空状态
   ============================================================ */
.empty-state {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    margin-top: 80px;
    padding: 40px;
}

.empty-state.visible {
    display: flex;
}

.empty-state p {
    font-size: var(--font-size-md);
    color: var(--text-primary);
    font-weight: 500;
}

.empty-state span {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* ============================================================
   Toast 通知
   ============================================================ */
.toast-container {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    background: rgba(30,30,30,0.95);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    box-shadow: 0 4px 16px rgba(0,0,0,0.3);
    animation: toastIn 0.3s ease forwards;
    pointer-events: auto;
}

.toast.success {
    border-color: rgba(5,150,105,0.3);
}

.toast.error {
    border-color: rgba(234,88,12,0.3);
}

.toast-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.toast.success .toast-icon path {
    stroke: #059669;
}

.toast.error .toast-icon path {
    stroke: #EA580C;
}

.toast-exit {
    animation: toastOut 0.3s ease forwards;
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes toastOut {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100px);
    }
}

/* ============================================================
   页脚
   ============================================================ */
.footer {
    background: var(--bg-footer);
    border-top: 1px solid var(--border-subtle);
    padding: 48px 0 0;
}

.footer-inner {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr 1fr 1fr;
    gap: 24px;
    padding-bottom: 48px;
}

.footer-brand {}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.footer-logo .logo-icon {
    width: 32px;
    height: 32px;
}

.footer-logo-name {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--text-primary);
}

.footer-desc {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.6;
}

.footer-title {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--text-primary);
}

.social-icons {
    display: flex;
    gap: 16px;
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    transition: opacity var(--transition-fast);
}

.social-icon:hover {
    opacity: 0.7;
}

.footer-bottom {
    border-top: 1px solid var(--border-subtle);
    padding: 32px 0;
    text-align: center;
}

.footer-bottom p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* ============================================================
   响应式布局
   ============================================================ */

/* 大桌面端 1024px-1536px */
@media (max-width: 1536px) {
    .prompts-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 桌面端 1024px-1280px */
@media (max-width: 1280px) {
    .prompts-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .search-box {
        width: 400px;
    }
}

/* 平板 768px-1024px */
@media (max-width: 1024px) {
    .prompts-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .search-box {
        width: 320px;
    }

    .gradient-text {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: var(--font-size-md);
    }

    .nav-menu .nav-item:nth-child(n+3) {
        display: none;
    }
}

/* 手机端 320px-768px */
@media (max-width: 768px) {
    .prompts-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .content-header {
        flex-direction: column;
        align-items: stretch;
    }

    .category-tabs {
        overflow-x: auto;
        width: 100%;
    }

    .filter-bar {
        justify-content: flex-end;
    }

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

    .hero {
        height: auto;
        padding: 100px 20px 40px;
    }

    .hero-search {
        flex-direction: column;
    }

    .search-box {
        width: 100%;
    }

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

    .gradient-text {
        font-size: 28px;
    }

    .hero-subtitle {
        font-size: var(--font-size-sm);
    }

    .nav-menu {
        display: none;
    }

    .logo-name {
        display: none;
    }

    .content {
        padding: 0 var(--spacing-md) 40px;
    }

    .card-image {
        height: 180px;
    }
}

@media (max-width: 480px) {
    .gradient-text {
        font-size: 24px;
    }

    .card-title {
        font-size: var(--font-size-md);
    }
}