/* ============================================================
   小喻子AI艺术二维码生成系统 - 全局样式表
   纯原生CSS，现代设计风格
   ============================================================ */

/* ----------------------------------------------------------
   CSS 变量定义
   ---------------------------------------------------------- */
:root {
    /* 主题色系 */
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-primary-light: #818cf8;
    --color-primary-lighter: #c7d2fe;
    --color-primary-bg: #eef2ff;

    /* 语义色 */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-info: #3b82f6;

    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-dark: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #4338ca 100%);

    /* 中性色 */
    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;

    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-primary: 0 4px 14px 0 rgba(99, 102, 241, 0.35);

    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;

    /* 过渡 */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* 字体 */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", Menlo, Courier, monospace;

    /* 布局 */
    --header-height: 70px;
    --container-max: 1200px;
}

/* ----------------------------------------------------------
   Reset & 基础样式
   ---------------------------------------------------------- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-gray-800);
    background-color: var(--color-white);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-dark);
}

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

ul, ol {
    list-style: none;
}

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

input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* ----------------------------------------------------------
   容器
   ---------------------------------------------------------- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ----------------------------------------------------------
   区块
   ---------------------------------------------------------- */
.section-padding {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
}

.section-desc {
    font-size: 1.1rem;
    color: var(--color-gray-500);
    max-width: 600px;
    margin: 0 auto;
}

.bg-light {
    background-color: var(--color-gray-50);
}

.bg-gradient {
    background: var(--gradient-dark);
    color: var(--color-white);
}

/* ----------------------------------------------------------
   导航栏
   ---------------------------------------------------------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(229, 231, 235, 0.5);
    height: var(--header-height);
    transition: box-shadow var(--transition-base);
}

.site-header.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* Logo */
.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-gray-900);
    white-space: nowrap;
}

.nav-logo i {
    font-size: 1.4rem;
    color: var(--color-primary);
}

.nav-logo:hover {
    color: var(--color-primary);
}

/* 导航菜单 */
.nav-list {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-gray-600);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-primary);
    background-color: var(--color-primary-bg);
}

.nav-link.active {
    color: var(--color-primary);
    background-color: var(--color-primary-bg);
    font-weight: 600;
}

/* 右侧操作区 */
.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* 用户下拉菜单 */
.user-dropdown {
    position: relative;
}

.user-dropdown-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-gray-50);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    color: var(--color-gray-700);
    transition: all var(--transition-fast);
}

.user-dropdown-toggle:hover {
    border-color: var(--color-primary-light);
    background: var(--color-primary-bg);
}

.user-dropdown-toggle .fa-circle-user {
    font-size: 1.2rem;
    color: var(--color-primary);
}

.user-name {
    font-weight: 600;
    max-width: 100px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-points {
    color: var(--color-warning);
    font-weight: 600;
    font-size: 0.85rem;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 180px;
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-sm) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-fast);
    z-index: 1001;
}

.dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
    color: var(--color-gray-700);
    transition: background var(--transition-fast);
}

.dropdown-menu li a:hover {
    background: var(--color-gray-50);
    color: var(--color-primary);
}

.dropdown-divider {
    height: 1px;
    background: var(--color-gray-200);
    margin: var(--spacing-xs) 0;
}

/* 汉堡菜单按钮 */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    gap: 5px;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

.hamburger:hover {
    background: var(--color-gray-100);
}

.hamburger-line {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-gray-700);
    border-radius: 2px;
    transition: all var(--transition-base);
}

.hamburger.active .hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ----------------------------------------------------------
   Hero 区域
   ---------------------------------------------------------- */
.hero {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(180deg, var(--color-primary-bg) 0%, var(--color-white) 100%);
    overflow: hidden;
}

.hero .container {
    display: flex;
    align-items: center;
    gap: var(--spacing-3xl);
    min-height: 520px;
}

.hero-content {
    flex: 1;
}

.hero-title {
    font-size: 3rem;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
    color: var(--color-gray-900);
    animation: fadeInUp 0.6s ease forwards;
}

.hero-title-main {
    display: block;
}

.hero-title-highlight {
    display: inline-block;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--color-gray-500);
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.6s ease 0.1s forwards;
    opacity: 0;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
    animation: fadeInUp 0.6s ease 0.2s forwards;
    opacity: 0;
}

.hero-stats-mini {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    animation: fadeInUp 0.6s ease 0.3s forwards;
    opacity: 0;
}

.stat-mini-item {
    display: flex;
    flex-direction: column;
}

.stat-mini-number {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-primary);
}

.stat-mini-label {
    font-size: 0.85rem;
    color: var(--color-gray-400);
}

.stat-mini-divider {
    width: 1px;
    height: 32px;
    background: var(--color-gray-200);
}

/* Hero 视觉区 */
.hero-visual {
    flex: 0 0 380px;
    position: relative;
    animation: fadeInRight 0.6s ease forwards;
}

.hero-qr-preview {
    text-align: center;
}

.hero-qr-frame {
    width: 260px;
    height: 260px;
    margin: 0 auto;
    background: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.hero-qr-frame::before {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: var(--radius-xl);
    background: var(--gradient-primary);
    z-index: -1;
    animation: rotateGradient 4s linear infinite;
}

.hero-qr-placeholder {
    font-size: 5rem;
    color: var(--color-primary-light);
}

.hero-qr-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-white);
    border: 1px solid var(--color-primary-lighter);
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

/* 浮动卡片 */
.hero-floating-elements {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.float-card {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-white);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    font-size: 0.85rem;
    font-weight: 600;
    white-space: nowrap;
    animation: floatUpDown 3s ease-in-out infinite;
}

.float-card-1 {
    top: 10%;
    left: -20px;
    color: var(--color-warning);
    animation-delay: 0s;
}

.float-card-2 {
    top: 45%;
    right: -30px;
    color: var(--color-success);
    animation-delay: 1s;
}

.float-card-3 {
    bottom: 10%;
    left: 10%;
    color: var(--color-info);
    animation-delay: 2s;
}

/* ----------------------------------------------------------
   动画关键帧
   ---------------------------------------------------------- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(40px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes rotateGradient {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes floatUpDown {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* ----------------------------------------------------------
   按钮样式
   ---------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 10px 22px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: 2px solid transparent;
    white-space: nowrap;
    text-decoration: none;
    line-height: 1.4;
}

.btn:active {
    transform: scale(0.97);
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.45);
    transform: translateY(-2px);
    color: var(--color-white);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary-light);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.85rem;
    border-radius: var(--radius-sm);
}

.btn-lg {
    padding: 14px 32px;
    font-size: 1.05rem;
    border-radius: var(--radius-lg);
}

.btn-block {
    width: 100%;
    display: flex;
}

.btn:disabled,
.btn.loading {
    opacity: 0.65;
    pointer-events: none;
}

.btn .fa-spinner {
    animation: spin 0.8s linear infinite;
}

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

/* ----------------------------------------------------------
   表单样式
   ---------------------------------------------------------- */
.form-row {
    margin-bottom: var(--spacing-lg);
}

.form-row-2col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.form-row-3col {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: 6px;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 0.95rem;
    color: var(--color-gray-800);
    background: var(--color-white);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-input::placeholder {
    color: var(--color-gray-400);
}

.form-input-sm {
    padding: 8px 12px;
    font-size: 0.85rem;
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
    cursor: pointer;
}

.form-range {
    width: 100%;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    background: var(--color-gray-200);
    border-radius: var(--radius-full);
    outline: none;
    cursor: pointer;
}

.form-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast);
}

.form-range::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.form-range::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    border: none;
}

.range-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--color-gray-400);
    margin-top: var(--spacing-xs);
}

.form-hint {
    font-size: 0.8rem;
    color: var(--color-gray-400);
    margin-top: var(--spacing-xs);
}

/* 颜色选择器 */
.color-picker-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.form-color {
    width: 44px;
    height: 44px;
    padding: 2px;
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-sm);
    cursor: pointer;
    background: none;
}

.form-color:focus {
    border-color: var(--color-primary);
}

.color-picker-group .form-input-sm {
    flex: 1;
    font-family: var(--font-mono);
}

/* ----------------------------------------------------------
   卡片组件
   ---------------------------------------------------------- */

/* 特色功能卡片 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.feature-card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-100);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    border-radius: var(--radius-lg);
    background: var(--color-primary-bg);
    margin-bottom: var(--spacing-lg);
}

.feature-icon i {
    font-size: 1.6rem;
    color: var(--color-primary);
}

.feature-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-sm);
}

.feature-desc {
    font-size: 0.9rem;
    color: var(--color-gray-500);
    line-height: 1.7;
}

/* 模板卡片 */
.templates-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-lg);
}

.template-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-gray-100);
    transition: all var(--transition-base);
    cursor: pointer;
}

.template-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

.template-card-image {
    position: relative;
    aspect-ratio: 3 / 4;
    overflow: hidden;
    background: linear-gradient(135deg, var(--color-primary-bg), var(--color-gray-100));
}

.template-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    color: var(--color-primary-light);
}

.template-placeholder i {
    font-size: 2.5rem;
    opacity: 0.5;
}

.template-placeholder span {
    font-size: 0.9rem;
    font-weight: 600;
}

.template-card-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.template-card:hover .template-card-overlay {
    opacity: 1;
}

.template-card-info {
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.template-card-name {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-gray-800);
}

.template-card-category {
    font-size: 0.75rem;
    color: var(--color-gray-400);
    background: var(--color-gray-100);
    padding: 2px 10px;
    border-radius: var(--radius-full);
}

.templates-more {
    text-align: center;
    margin-top: var(--spacing-xl);
}

/* ----------------------------------------------------------
   生成工具区
   ---------------------------------------------------------- */
.generator-box {
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: var(--spacing-xl);
    align-items: start;
}

.generator-form {
    background: var(--color-white);
    border: 1px solid var(--color-gray-100);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.generator-preview {
    background: var(--color-white);
    border: 2px dashed var(--color-gray-200);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    position: sticky;
    top: calc(var(--header-height) + var(--spacing-lg));
}

.preview-placeholder {
    text-align: center;
    color: var(--color-gray-400);
}

.preview-placeholder i {
    font-size: 4rem;
    display: block;
    margin-bottom: var(--spacing-md);
    opacity: 0.4;
}

.preview-placeholder p {
    font-size: 0.9rem;
    line-height: 1.8;
}

.preview-result {
    text-align: center;
    width: 100%;
}

.preview-result img {
    max-width: 260px;
    margin: 0 auto var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.preview-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

/* ----------------------------------------------------------
   统计数字区
   ---------------------------------------------------------- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
    text-align: center;
}

.stat-item {
    padding: var(--spacing-lg);
}

.stat-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.8;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: var(--spacing-xs);
    font-variant-numeric: tabular-nums;
}

.stat-label {
    font-size: 1rem;
    opacity: 0.8;
}

/* ----------------------------------------------------------
   模态框
   ---------------------------------------------------------- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.modal-overlay.show {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    width: 90%;
    max-width: 440px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    transform: translateY(20px);
    transition: transform var(--transition-base);
}

.modal-overlay.show .modal {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg) var(--spacing-xl);
    border-bottom: 1px solid var(--color-gray-100);
}

.modal-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-gray-900);
}

.modal-close {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    font-size: 1.1rem;
    color: var(--color-gray-400);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--color-gray-100);
    color: var(--color-gray-700);
}

.modal-body {
    padding: var(--spacing-xl);
}

.modal-footer {
    padding: var(--spacing-md) var(--spacing-xl) var(--spacing-xl);
    text-align: center;
}

.modal-switch {
    font-size: 0.9rem;
    color: var(--color-gray-500);
}

.modal-switch a {
    font-weight: 600;
    cursor: pointer;
}

/* ----------------------------------------------------------
   Toast 消息
   ---------------------------------------------------------- */
.toast-container {
    position: fixed;
    top: calc(var(--header-height) + var(--spacing-md));
    right: var(--spacing-lg);
    z-index: 3000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    font-size: 0.9rem;
    font-weight: 500;
    pointer-events: auto;
    animation: toastIn 0.3s ease forwards;
    border-left: 4px solid;
    min-width: 280px;
    max-width: 400px;
}

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

.toast-success {
    border-left-color: var(--color-success);
}

.toast-success i { color: var(--color-success); }

.toast-error {
    border-left-color: var(--color-danger);
}

.toast-error i { color: var(--color-danger); }

.toast-warning {
    border-left-color: var(--color-warning);
}

.toast-warning i { color: var(--color-warning); }

.toast-info {
    border-left-color: var(--color-info);
}

.toast-info i { color: var(--color-info); }

.toast-message {
    flex: 1;
}

.toast-close {
    color: var(--color-gray-400);
    cursor: pointer;
    padding: 2px;
    transition: color var(--transition-fast);
}

.toast-close:hover {
    color: var(--color-gray-700);
}

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

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

/* ----------------------------------------------------------
   页脚
   ---------------------------------------------------------- */
.site-footer {
    background: var(--color-gray-900);
    color: var(--color-gray-400);
    padding: var(--spacing-3xl) 0 0;
    margin-top: auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
}

.footer-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-title i {
    color: var(--color-primary);
}

.footer-desc {
    font-size: 0.9rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.footer-social {
    display: flex;
    gap: var(--spacing-sm);
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    color: var(--color-gray-400);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.footer-social a:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

.footer-links ul li,
.footer-contact ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-links ul li a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--color-gray-400);
    transition: color var(--transition-fast);
}

.footer-links ul li a:hover {
    color: var(--color-white);
}

.footer-links ul li a i {
    font-size: 0.7rem;
    color: var(--color-primary);
}

.footer-contact ul li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.9rem;
}

.footer-contact ul li i {
    width: 18px;
    text-align: center;
    color: var(--color-primary);
    flex-shrink: 0;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-lg) 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.footer-bottom a {
    color: var(--color-gray-500);
}

.footer-bottom a:hover {
    color: var(--color-white);
}

.footer-separator {
    margin: 0 var(--spacing-sm);
    color: rgba(255, 255, 255, 0.2);
}

/* ----------------------------------------------------------
   响应式: 768px 断点
   ---------------------------------------------------------- */
@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    .section-padding {
        padding: var(--spacing-2xl) 0;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .section-desc {
        font-size: 0.95rem;
    }

    /* 导航栏 */
    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--color-gray-200);
        padding: var(--spacing-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
        z-index: 999;
    }

    .nav-menu.show {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-list {
        flex-direction: column;
        gap: 0;
    }

    .nav-link {
        padding: var(--spacing-md);
        border-radius: var(--radius-md);
    }

    .hamburger {
        display: flex;
    }

    .nav-actions .btn {
        font-size: 0.8rem;
        padding: 6px 12px;
    }

    .user-name {
        display: none;
    }

    /* Hero */
    .hero .container {
        flex-direction: column;
        text-align: center;
        min-height: auto;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-actions {
        justify-content: center;
        flex-wrap: wrap;
    }

    .hero-stats-mini {
        justify-content: center;
    }

    .hero-visual {
        flex: 0 0 auto;
        width: 100%;
        max-width: 320px;
    }

    .float-card-1 { left: 0; }
    .float-card-2 { right: 0; }

    /* 特色功能 */
    .features-grid {
        grid-template-columns: 1fr;
    }

    /* 模板 */
    .templates-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* 生成工具 */
    .generator-box {
        grid-template-columns: 1fr;
    }

    .generator-preview {
        position: static;
        min-height: 300px;
    }

    .form-row-2col,
    .form-row-3col {
        grid-template-columns: 1fr;
    }

    /* 统计 */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .stat-number {
        font-size: 2rem;
    }

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

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

/* ----------------------------------------------------------
   响应式: 480px 断点
   ---------------------------------------------------------- */
@media (max-width: 480px) {
    .hero-title {
        font-size: 1.6rem;
    }

    .hero-subtitle br {
        display: none;
    }

    .hero-stats-mini {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .stat-mini-divider {
        width: 40px;
        height: 1px;
    }

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

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

    .modal {
        width: 95%;
        margin: var(--spacing-md);
        border-radius: var(--radius-lg);
    }

    .toast {
        min-width: auto;
        max-width: calc(100vw - 32px);
    }

    .toast-container {
        right: var(--spacing-md);
    }
}