/* ===================================
   银龄AI学堂 - 适老化全局样式
   设计系统：温暖橙色主色调，适合老年用户
   =================================== */

/* ========== 1. CSS 变量 ========== */
:root {
    /* ---- Color System ---- */
    /* Primary: Warm orange - friendly, energetic, approachable */
    --color-primary: #E8763A;
    --color-primary-hover: #D4682F;
    --color-primary-light: #FFF3EB;
    --color-primary-50: #FEF7F0;
    --color-primary-100: #FDDFC9;
    --color-primary-200: #FBC49B;
    --color-primary-300: #F9A86D;
    --color-primary-400: #F58D41;
    --color-primary-500: #E8763A;
    --color-primary-600: #D4682F;
    --color-primary-700: #A85528;
    --color-primary-800: #7C3F1E;
    --color-primary-900: #502A14;

    /* Neutral: Warm grays with slight warm undertone */
    --color-neutral-50: #FAFAF7;
    --color-neutral-100: #F5F4F0;
    --color-neutral-200: #E8E6E1;
    --color-neutral-300: #D5D2CB;
    --color-neutral-400: #9C978E;
    --color-neutral-500: #78736A;
    --color-neutral-600: #5C5750;
    --color-neutral-700: #4A453F;
    --color-neutral-800: #38342F;
    --color-neutral-900: #262320;

    /* Background surfaces */
    --color-bg-primary: #FFFBF6;
    --color-bg-secondary: #F8F5F0;
    --color-bg-tertiary: #F0ECE5;
    --color-bg-card: #FFFFFF;
    --color-bg-card-hover: #FFFCF9;

    /* Text */
    --color-text-primary: #3D3832;
    --color-text-secondary: #6B645C;
    --color-text-tertiary: #9C978E;
    --color-text-inverse: #FFFFFF;
    --color-text-link: #E8763A;
    --color-text-link-hover: #D4682F;

    /* Semantic state colors */
    --state-success: #4A9D6E;
    --state-success-bg: #EDFAF2;
    --state-warning: #E5A832;
    --state-warning-bg: #FFF8E6;
    --state-error: #D45050;
    --state-error-bg: #FDF0F0;
    --state-info: #5A8DBE;
    --state-info-bg: #EFF6FC;

    /* ---- Typography System ---- */
    --font-family-base: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
    --font-family-display: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;

    /* Type scale - larger than typical for readability */
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 18px;
    --font-size-lg: 20px;
    --font-size-xl: 24px;
    --font-size-2xl: 30px;
    --font-size-3xl: 36px;
    --font-size-4xl: 44px;
    --font-size-5xl: 56px;

    /* Line-heights */
    --line-height-tight: 1.3;
    --line-height-snug: 1.45;
    --line-height-base: 1.7;
    --line-height-relaxed: 1.85;

    /* Font weights */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* ---- Spacing System ---- */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    --spacing-4xl: 80px;
    --spacing-5xl: 96px;

    /* ---- Radius System ---- */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* ---- Shadows ---- */
    --shadow-sm: 0 1px 2px rgba(61, 56, 50, 0.04);
    --shadow-md: 0 2px 8px rgba(61, 56, 50, 0.04);
    --shadow-lg: 0 4px 16px rgba(61, 56, 50, 0.05);
    --shadow-float: 0 8px 32px rgba(61, 56, 50, 0.12);

    /* ---- Border ---- */
    --border-color: #E8E6E1;
    --border-color-hover: #D5D2CB;
    --border-width: 1px;

    /* ---- Transitions ---- */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

/* 加大字体模式 */
body.font-large {
    --font-size-base: 24px;
    --font-size-lg: 28px;
    --font-size-xl: 32px;
    --font-size-2xl: 40px;
    --font-size-3xl: 48px;
    --font-size-4xl: 58px;
    --font-size-5xl: 72px;
}

/* 特大字体模式 */
body.font-xlarge {
    --font-size-base: 32px;
    --font-size-lg: 36px;
    --font-size-xl: 42px;
    --font-size-2xl: 52px;
    --font-size-3xl: 62px;
    --font-size-4xl: 74px;
    --font-size-5xl: 90px;
}

/* ========== 2. 基础样式 ========== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

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

/* 标题 */
h1, h2, h3, h4, h5, h6 {
    line-height: var(--line-height-snug);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    font-family: var(--font-family-display);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-xl); }

/* 段落 */
p {
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
}

/* 链接 */
a {
    color: var(--color-text-link);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-text-link-hover);
}

a:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: 4px;
}

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

/* 列表 */
ul, ol {
    padding-left: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

li {
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
}

/* ========== 装饰元素 ========== */
.decor-blob {
    position: absolute;
    border-radius: 50%;
    opacity: 0.2;
    pointer-events: none;
    z-index: 0;
}

.nav-rainbow {
    display: none;
}

/* ========== 3. 导航栏 ========== */
.senior-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    background: var(--color-bg-primary);
    border-bottom: var(--border-width) solid var(--border-color);
    z-index: 100;
    height: 72px;
}

.senior-nav .senior-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    height: 100%;
}

.senior-nav-brand {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    white-space: nowrap;
}

.senior-nav-brand:hover {
    color: var(--color-text-primary);
}

.senior-nav-brand .brand-icon {
    width: 40px;
    height: 40px;
    background: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.senior-nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    list-style: none;
    padding: 0;
    margin: 0;
    flex-wrap: wrap;
}

.senior-nav-links li {
    margin: 0;
}

.senior-nav-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: color var(--transition-fast), background var(--transition-fast);
    white-space: nowrap;
}

.senior-nav-links a:hover {
    color: var(--color-primary);
    background: var(--color-primary-light);
}

.senior-nav-links a.active {
    color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
}

/* 导航栏占位 */
.senior-nav-placeholder {
    padding-top: 72px;
}

/* ========== 导航栏字号切换 ========== */
.font-size-toggle {
    display: flex;
    align-items: center;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: var(--border-width) solid var(--border-color);
}

.font-size-toggle button {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    font-family: inherit;
    color: var(--color-text-secondary);
    background: var(--color-bg-card);
    border: none;
    border-left: var(--border-width) solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition-fast);
    min-width: 60px;
}

.font-size-toggle button:first-child {
    border-left: none;
}

.font-size-toggle button:hover {
    background: var(--color-neutral-100);
    color: var(--color-text-primary);
}

.font-size-toggle button.active {
    background: var(--color-primary);
    color: white;
}

/* ========== 导航栏语音开关 ========== */
.voice-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    border: var(--border-width) solid var(--border-color);
    background: var(--color-bg-card);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.voice-toggle:hover {
    background: var(--color-neutral-100);
    color: var(--color-text-primary);
}

.voice-toggle.active {
    background: var(--state-success);
    color: white;
}

/* ========== 4. 按钮 ========== */
.btn-senior, .senior-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    height: 48px;
    padding: 0 24px;
    font-size: var(--font-size-base);
    font-family: inherit;
    font-weight: var(--font-weight-semibold);
    line-height: 1.4;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    white-space: nowrap;
    min-height: 48px;
}

.btn-senior:focus-visible, .senior-btn:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 3px;
}

/* 主要按钮 */
.btn-senior-primary, .senior-btn-primary {
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

.btn-senior-primary:hover, .senior-btn-primary:hover {
    background: var(--color-primary-hover);
}

/* 次要按钮 - 暖色 */
.btn-senior-secondary, .senior-btn-secondary, .senior-btn-warm {
    background: var(--color-primary-light);
    color: var(--color-primary);
    border: var(--border-width) solid var(--color-primary-300);
}

.btn-senior-secondary:hover, .senior-btn-secondary:hover, .senior-btn-warm:hover {
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

/* 描边按钮 */
.btn-senior-outline, .senior-btn-outline {
    background: var(--color-bg-card);
    color: var(--color-primary);
    border: var(--border-width) solid var(--color-primary);
}

.btn-senior-outline:hover, .senior-btn-outline:hover {
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

/* 大号按钮 */
.btn-senior-large, .senior-btn-large {
    height: 56px;
    padding: 0 32px;
    font-size: var(--font-size-lg);
}

/* 全宽按钮 */
.btn-senior-block, .senior-btn-block {
    width: 100%;
}

/* 禁用状态 */
.btn-senior:disabled,
.btn-senior.disabled,
.senior-btn:disabled,
.senior-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* ========== 5. 卡片 ========== */
.senior-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    border: var(--border-width) solid var(--border-color);
    transition: background var(--transition-normal);
}

.senior-card:hover {
    background: var(--color-bg-card-hover);
}

.senior-card-header {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.senior-card-body {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

.senior-card-footer {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: var(--border-width) solid var(--border-color);
}

/* ========== 6. 区块样式 ========== */
.senior-section {
    padding: var(--spacing-4xl) 0;
}

.senior-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

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

.senior-section-header h2 {
    font-size: var(--font-size-3xl);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.senior-section-header p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    max-width: 560px;
    margin: 0 auto;
}

/* ========== 7. 表单元素 ========== */
.senior-form-group {
    margin-bottom: var(--spacing-xl);
}

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

.senior-form-group .form-hint {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    margin-top: var(--spacing-xs);
}

.senior-input {
    width: 100%;
    height: 52px;
    padding: 0 var(--spacing-lg);
    font-size: var(--font-size-base);
    font-family: inherit;
    color: var(--color-text-primary);
    background: var(--color-bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    -webkit-appearance: none;
    appearance: none;
}

.senior-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(232, 118, 58, 0.1);
}

.senior-input::placeholder {
    color: var(--color-text-tertiary);
    font-size: var(--font-size-base);
}

.senior-textarea {
    width: 100%;
    min-height: 140px;
    padding: var(--spacing-lg);
    font-size: var(--font-size-base);
    font-family: inherit;
    color: var(--color-text-primary);
    background: var(--color-bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    resize: vertical;
    line-height: var(--line-height-relaxed);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.senior-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(232, 118, 58, 0.1);
}

.senior-select {
    width: 100%;
    height: 52px;
    padding: 0 var(--spacing-xl) 0 var(--spacing-lg);
    font-size: var(--font-size-base);
    font-family: inherit;
    color: var(--color-text-primary);
    background: var(--color-bg-card) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2378736A' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E") no-repeat right var(--spacing-md) center;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.senior-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(232, 118, 58, 0.1);
}

/* 大号复选框 / 单选框 */
.senior-checkbox,
.senior-radio {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-base);
    cursor: pointer;
    min-height: 48px;
    padding: var(--spacing-sm) 0;
}

.senior-checkbox input[type="checkbox"],
.senior-radio input[type="radio"] {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    cursor: pointer;
    accent-color: var(--color-primary);
}

/* ========== 8. FAQ 手风琴样式 ========== */
.faq-item {
    background: var(--color-bg-card);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.faq-item:hover {
    border-color: var(--color-primary);
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-xl);
    cursor: pointer;
    background: var(--color-bg-card);
    transition: background var(--transition-fast);
}

.faq-question:hover {
    background: var(--color-neutral-50);
}

.faq-question span {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    line-height: var(--line-height-relaxed);
}

.faq-icon {
    font-size: var(--font-size-lg);
    color: var(--color-primary);
    transition: transform var(--transition-normal);
    flex-shrink: 0;
    margin-left: var(--spacing-md);
}

.faq-item.open .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.faq-item.open .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: var(--spacing-xl);
    margin: 0;
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    border-top: var(--border-width) solid var(--border-color);
}

/* ========== 9. 工具类 ========== */
.text-display {
    font-family: var(--font-family-display);
    font-weight: var(--font-weight-bold);
}

.text-body {
    font-family: var(--font-family-base);
    font-weight: var(--font-weight-normal);
}

.text-ellipsis {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* 语音朗读按钮 */
.voice-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    min-width: 40px;
    min-height: 40px;
    padding: 0;
    font-size: var(--font-size-lg);
    font-family: inherit;
    color: var(--color-primary);
    background: var(--color-bg-card);
    border: 2px solid var(--color-primary);
    border-radius: 50%;
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
    vertical-align: middle;
    margin-left: var(--spacing-sm);
}

.voice-btn:hover {
    background: var(--color-primary);
    color: white;
    transform: scale(1.1);
}

.voice-btn.playing {
    background: var(--color-primary);
    color: white;
    animation: voice-pulse 1.2s ease-in-out infinite;
}

@keyframes voice-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

/* 文字对齐 */
.text-center { text-align: center; }
.text-left   { text-align: left; }
.text-right  { text-align: right; }

/* 间距工具 */
.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); }
.mt-xl { margin-top: var(--spacing-xl); }
.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); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mb-2xl { margin-bottom: var(--spacing-2xl); }

/* 弹性布局工具 */
.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.flex-col {
    display: flex;
    flex-direction: column;
}

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

/* 网格布局工具 */
.senior-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

/* 分割线 */
.senior-divider {
    border: none;
    border-top: var(--border-width) solid var(--border-color);
    margin: var(--spacing-xl) 0;
}

/* 高亮提示条 */
.senior-alert {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-md);
}

.senior-alert-info {
    background: var(--state-info-bg);
    border: var(--border-width) solid var(--state-info);
    color: var(--state-info);
}

.senior-alert-success {
    background: var(--state-success-bg);
    border: var(--border-width) solid var(--state-success);
    color: var(--state-success);
}

.senior-alert-warning {
    background: var(--state-warning-bg);
    border: var(--border-width) solid var(--state-warning);
    color: var(--state-warning);
}

.senior-alert-danger {
    background: var(--state-error-bg);
    border: var(--border-width) solid var(--state-error);
    color: var(--state-error);
}

/* ========== 10. 响应式 ========== */
@media (max-width: 960px) {
    :root {
        --font-size-base: 16px;
        --font-size-lg: 18px;
        --font-size-xl: 22px;
        --font-size-2xl: 26px;
        --font-size-3xl: 30px;
        --font-size-4xl: 38px;
        --font-size-5xl: 48px;
    }

    body.font-large {
        --font-size-base: 22px;
        --font-size-lg: 26px;
        --font-size-xl: 30px;
        --font-size-2xl: 38px;
        --font-size-3xl: 46px;
        --font-size-4xl: 56px;
        --font-size-5xl: 68px;
    }

    body.font-xlarge {
        --font-size-base: 30px;
        --font-size-lg: 34px;
        --font-size-xl: 40px;
        --font-size-2xl: 48px;
        --font-size-3xl: 58px;
        --font-size-4xl: 70px;
        --font-size-5xl: 84px;
    }

    .senior-nav {
        height: auto;
        padding: var(--spacing-sm) 0;
    }

    .senior-nav .senior-container {
        flex-direction: column;
        height: auto;
        gap: var(--spacing-md);
    }

    .senior-nav-links {
        justify-content: center;
        gap: var(--spacing-md);
    }

    .senior-nav-links a {
        padding: var(--spacing-sm) var(--spacing-lg);
    }

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

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

    .font-size-toggle {
        flex-wrap: wrap;
    }

    .btn-senior-large, .senior-btn-large {
        height: 52px;
        padding: 0 24px;
    }
}

@media (max-width: 480px) {
    .senior-nav-links {
        gap: var(--spacing-sm);
    }

    .senior-nav-links a {
        font-size: var(--font-size-sm);
        padding: var(--spacing-xs) var(--spacing-md);
    }

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

/* ========== 11. 动画 ========== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    html {
        scroll-behavior: auto;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease forwards;
}

/* ========== 12. 打印样式 ========== */
@media print {
    *,
    *::before,
    *::after {
        background: #fff !important;
        color: #000 !important;
        box-shadow: none !important;
        text-shadow: none !important;
    }

    body {
        font-size: 14pt;
        line-height: 1.6;
        color: #000;
        background: #fff;
    }

    a {
        color: #000;
        text-decoration: underline;
    }

    a[href]::after {
        content: " (" attr(href) ")";
        font-size: 10pt;
        color: #555;
    }

    .senior-nav,
    .font-size-controls,
    .voice-btn,
    .btn-senior,
    .senior-btn,
    .senior-nav-placeholder {
        display: none !important;
    }

    .senior-card {
        border: 1px solid #ccc;
        page-break-inside: avoid;
    }

    .senior-section {
        padding: 10pt 0;
    }
}