/* ============================================================
 * 移动端统一样式框架
 * 基于 iOS Human Interface Guidelines 设计规范
 * ============================================================ */

/* --------------------------
 * 基础重置样式
 * -------------------------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: #f5f5f7;
    color: #1d1d1f;
    line-height: 1.5;
    font-weight: 400;
    letter-spacing: -0.01em;
    min-height: 100vh;
}

/* --------------------------
 * 响应式断点
 * -------------------------- */
:root {
    --breakpoint-xs: 320px;
    --breakpoint-sm: 414px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
}

/* --------------------------
 * 颜色变量
 * -------------------------- */
:root {
    --color-primary: #0071e3;
    --color-primary-hover: #0077ed;
    --color-primary-dark: #0066cc;
    --color-secondary: #d1d1d6;
    --color-secondary-hover: #a1a1a6;
    --color-success: #30d158;
    --color-success-bg: #d4edda;
    --color-warning: #ff9500;
    --color-warning-bg: #fff3cd;
    --color-error: #ff453a;
    --color-error-bg: #f8d7da;
    --color-text-primary: #1d1d1f;
    --color-text-secondary: #6e6e73;
    --color-text-muted: #86868b;
    --color-border: #d1d1d6;
    --color-bg: #f5f5f7;
    --color-bg-card: #ffffff;
    --color-bg-hover: #f8f8fa;
    --color-gradient-start: #667eea;
    --color-gradient-end: #764ba2;
}

/* --------------------------
 * 间距变量
 * -------------------------- */
:root {
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
}

/* --------------------------
 * 字体大小变量
 * -------------------------- */
:root {
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-xxl: 32px;
}

/* --------------------------
 * 圆角变量
 * -------------------------- */
:root {
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 980px;
}

/* --------------------------
 * 阴影变量
 * -------------------------- */
:root {
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 15px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 25px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 12px 40px rgba(0, 0, 0, 0.15);
}

/* --------------------------
 * 导航栏样式
 * -------------------------- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    padding: 0 var(--spacing-md);
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-content {
    width: 100%;
    max-width: 480px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    text-decoration: none;
}

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

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color 0.2s;
}

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

.nav-links .nav-btn {
    padding: 6px 14px;
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
}

.nav-links .nav-btn:hover {
    background: var(--color-primary-hover);
}

.nav-menu-btn {
    width: 32px;
    height: 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-menu-btn span {
    width: 20px;
    height: 2px;
    background: var(--color-text-primary);
    border-radius: 1px;
}

/* 移动端底部导航 */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    display: flex;
    justify-content: space-around;
    padding: 8px 0;
    padding-bottom: calc(8px + env(safe-area-inset-bottom));
}

.bottom-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: var(--font-size-xs);
    transition: color 0.2s;
}

.bottom-nav-item.active {
    color: var(--color-primary);
}

.bottom-nav-item svg {
    width: 24px;
    height: 24px;
    fill: currentColor;
}

/* --------------------------
 * 容器和卡片样式
 * -------------------------- */
.container {
    max-width: 480px;
    margin: 0 auto;
    padding: var(--spacing-md);
    padding-top: calc(44px + var(--spacing-md));
    padding-bottom: calc(80px + var(--spacing-md));
}

.card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.card-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
}

.card-body {
    padding: var(--spacing-md);
}

.card-footer {
    padding: var(--spacing-md);
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    background: var(--color-bg);
}

/* 渐变卡片 */
.card-gradient {
    background: linear-gradient(135deg, var(--color-gradient-start) 0%, var(--color-gradient-end) 100%);
    color: white;
}

.card-gradient .card-header {
    border-color: rgba(255, 255, 255, 0.1);
}

.card-gradient .card-footer {
    background: rgba(0, 0, 0, 0.1);
    border-color: rgba(255, 255, 255, 0.1);
}

/* --------------------------
 * 按钮样式
 * -------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-primary);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-full);
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    min-height: 44px;
}

.btn:hover {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 113, 227, 0.3);
}

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

.btn:disabled {
    background: var(--color-secondary);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-block {
    width: 100%;
}

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

.btn-secondary:hover {
    background: var(--color-secondary-hover);
    box-shadow: 0 4px 12px rgba(161, 161, 166, 0.3);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--color-primary);
    color: var(--color-primary);
}

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

.btn-danger {
    background: var(--color-error);
}

.btn-danger:hover {
    background: #ff3b30;
    box-shadow: 0 4px 12px rgba(255, 69, 58, 0.3);
}

.btn-icon {
    width: 44px;
    height: 44px;
    padding: 0;
    border-radius: var(--radius-md);
}

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

.form-group label {
    display: block;
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.form-control {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    background: var(--color-bg);
    transition: all 0.2s;
    min-height: 44px;
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    background: var(--color-bg-card);
    box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.1);
}

.form-control::placeholder {
    color: var(--color-text-muted);
}

.form-control-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
    min-height: 36px;
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%236e6e73' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--spacing-sm) center;
    background-size: 16px;
    padding-right: calc(var(--spacing-md) + 24px);
}

/* --------------------------
 * 列表样式
 * -------------------------- */
.list-group {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.list-group-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: background 0.2s;
}

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

.list-group-item:hover {
    background: var(--color-bg-hover);
}

.list-group-item.active {
    background: rgba(0, 113, 227, 0.05);
}

.list-group-item-primary {
    flex: 1;
    min-width: 0;
}

.list-group-item-secondary {
    margin-left: var(--spacing-md);
    color: var(--color-text-secondary);
}

.list-group-item-title {
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: 2px;
}

.list-group-item-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* --------------------------
 * 进度条样式
 * -------------------------- */
.progress-bar {
    width: 100%;
    height: 8px;
    background: #e8e8ed;
    border-radius: 4px;
    overflow: hidden;
    margin: var(--spacing-sm) 0;
}

.progress {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary) 0%, #42a5f5 100%);
    border-radius: 4px;
    transition: width 0.5s ease-out;
}

.progress-success {
    background: linear-gradient(90deg, var(--color-success) 0%, #69db7c 100%);
}

.progress-warning {
    background: linear-gradient(90deg, var(--color-warning) 0%, #ffb06a 100%);
}

/* --------------------------
 * 状态提示样式
 * -------------------------- */
.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.alert-success {
    background: var(--color-success-bg);
    color: #155724;
}

.alert-warning {
    background: var(--color-warning-bg);
    color: #856404;
}

.alert-error {
    background: var(--color-error-bg);
    color: #721c24;
}

/* --------------------------
 * 加载和空状态样式
 * -------------------------- */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xxl) var(--spacing-md);
    color: var(--color-text-muted);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(0, 113, 227, 0.1);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

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

.empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-xxl) var(--spacing-md);
    color: var(--color-text-muted);
}

.empty-icon {
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

/* --------------------------
 * 模态框样式
 * -------------------------- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
}

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

.modal {
    background: var(--color-bg-card);
    width: 100%;
    max-width: 480px;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    transform: translateY(100%);
    transition: transform 0.3s;
    max-height: 80vh;
    overflow-y: auto;
}

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

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg) var(--spacing-md);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.modal-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
}

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 24px;
    color: var(--color-text-muted);
}

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

.modal-footer {
    padding: var(--spacing-md);
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    display: flex;
    gap: var(--spacing-sm);
}

.modal-footer .btn {
    flex: 1;
}

/* --------------------------
 * 价格样式
 * -------------------------- */
.price {
    color: var(--color-error);
    font-weight: 700;
}

.price-sm {
    font-size: var(--font-size-lg);
}

.price-md {
    font-size: var(--font-size-xl);
}

.price-lg {
    font-size: var(--font-size-xxl);
}

/* --------------------------
 * 标签样式
 * -------------------------- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.badge-success {
    background: rgba(48, 209, 88, 0.1);
    color: var(--color-success);
}

.badge-warning {
    background: rgba(255, 149, 0, 0.1);
    color: var(--color-warning);
}

.badge-error {
    background: rgba(255, 69, 58, 0.1);
    color: var(--color-error);
}

.badge-info {
    background: rgba(0, 113, 227, 0.1);
    color: var(--color-primary);
}

/* --------------------------
 * 图片样式
 * -------------------------- */
.img-fluid {
    width: 100%;
    height: auto;
}

.img-cover {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.img-contain {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* --------------------------
 * 文本样式
 * -------------------------- */
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-error { color: var(--color-error); }

.text-center { text-align: center; }
.text-right { text-align: right; }

.font-weight-bold { font-weight: 600; }
.font-weight-light { font-weight: 400; }

.text-sm { font-size: var(--font-size-sm); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }

/* --------------------------
 * 布局工具类
 * -------------------------- */
.d-flex { display: flex; }
.d-block { display: block; }
.d-none { display: none; }

.flex-column { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }

.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }

.align-center { align-items: center; }
.align-start { align-items: flex-start; }
.align-end { align-items: flex-end; }

.flex-1 { flex: 1; }
.flex-shrink-0 { flex-shrink: 0; }

.gap-xs { gap: var(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.mt-xs { margin-top: var(--spacing-xs); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

.p-xs { padding: var(--spacing-xs); }
.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }

/* --------------------------
 * 响应式工具类
 * -------------------------- */
@media (max-width: 768px) {
    .hidden-mobile {
        display: none !important;
    }
}

@media (min-width: 769px) {
    .hidden-desktop {
        display: none !important;
    }
}

/* --------------------------
 * 动画效果
 * -------------------------- */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.animate-fadeIn {
    animation: fadeIn 0.3s ease-out;
}

.animate-slideUp {
    animation: slideUp 0.3s ease-out;
}

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

/* --------------------------
 * 安全区域适配
 * -------------------------- */
.safe-area-bottom {
    padding-bottom: env(safe-area-inset-bottom);
}

.safe-area-top {
    padding-top: env(safe-area-inset-top);
}

/* --------------------------
 * 滚动条样式
 * -------------------------- */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}

/* --------------------------
 * 触摸优化
 * -------------------------- */
button, a {
    -webkit-tap-highlight-color: transparent;
}

input, textarea {
    -webkit-appearance: none;
    border-radius: 0;
}

/* --------------------------
 * 选择文本样式
 * -------------------------- */
::selection {
    background: rgba(0, 113, 227, 0.3);
    color: var(--color-text-primary);
}