/* ============================================
   智能手机使用指南 - 响应式样式 (现代化版本)
   ============================================ */

/* 大屏幕 (>1400px) */
@media screen and (min-width: 1401px) {
    :root {
        --sidebar-width: 340px;
    }

    .main-content {
        padding: 48px;
    }

    .content-section {
        padding: 44px;
    }
}

/* 中等大屏幕 (1200px - 1400px) */
@media screen and (min-width: 1201px) and (max-width: 1400px) {
    :root {
        --sidebar-width: 320px;
    }

    .main-content {
        padding: 40px;
    }

    .content-section {
        padding: 40px;
    }
}

/* 中等屏幕 (992px - 1200px) */
@media screen and (max-width: 1200px) {
    :root {
        --sidebar-width: 280px;
    }
    
    .logo-text {
        font-size: 1.1rem;
        white-space: nowrap;
    }
    
    .logo-text::before {
        content: attr(data-short-text);
    }
    
    .logo-text {
        font-size: 0;
    }
    
    .logo-text::before {
        font-size: 1.1rem;
    }
    
    .search-box input {
        width: 220px;
    }
    
    .search-box input:focus {
        width: 260px;
    }
    
    .main-content {
        padding: 28px;
    }
    
    .content-section {
        padding: 32px;
    }
}

/* 平板设备 (768px - 991px) */
@media screen and (max-width: 991px) {
    :root {
        --header-height: 60px;
        --sidebar-width: 0;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .logo-text {
        font-size: 1.1rem;
    }
    
    .search-box {
        display: none;
        position: absolute;
        top: calc(var(--header-height) + 8px);
        right: 16px;
        background: var(--bg-primary);
        padding: 12px;
        border-radius: var(--border-radius);
        box-shadow: var(--shadow-lg);
        border: 1px solid var(--border-color);
        z-index: 1001;
    }
    
    .search-box.active {
        display: flex;
    }
    
    .search-box input {
        width: 240px;
        padding-right: 44px;
    }
    
    .search-box .search-btn {
        position: absolute;
        right: 18px;
        top: 50%;
        transform: translateY(-50%);
    }
    
    .search-box .search-btn:hover {
        transform: translateY(-50%) scale(1.05);
    }
    
    .font-size-controls {
        display: none;
    }
    
    .font-toggle-mobile,
    .search-toggle-mobile {
        display: flex;
    }
    
    .sidebar {
        transform: translateX(-100%);
        width: 300px;
        box-shadow: var(--shadow-xl);
        z-index: 1100;
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
        padding: 24px;
    }
    
    .content-section {
        padding: 28px;
        border-radius: var(--border-radius);
    }
    
    .section-title {
        font-size: 1.6rem;
    }
    
    .step-item {
        padding: 20px;
    }
    
    .feature-list {
        grid-template-columns: 1fr;
    }
    
    .settings-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tips-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .intro-card {
        padding: 28px;
    }
    
    /* 图片画廊 */
    .image-gallery {
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }
    
    .gallery-image-wrapper {
        aspect-ratio: 1;
    }
    
    /* 灯箱 */
    .lightbox-nav {
        width: 52px;
        height: 52px;
        font-size: 1.4rem;
    }
    
    .lightbox-prev {
        left: 16px;
    }
    
    .lightbox-next {
        right: 16px;
    }
}

/* 大屏手机 (576px - 767px) */
@media screen and (max-width: 767px) {
    :root {
        --header-height: 56px;
    }
    
    .header {
        padding: 0 16px;
    }
    
    .logo {
        font-size: 1.2rem;
        gap: 12px;
    }
    
    .logo-icon {
        width: 2rem;
        height: 2rem;
    }
    
    .logo-icon svg {
        width: 100%;
        height: 100%;
    }
    
    .theme-toggle {
        width: 40px;
        height: 40px;
        font-size: 1.1rem;
    }
    
    .main-content {
        padding: 20px;
    }
    
    .content-section {
        padding: 24px;
        border-radius: var(--border-radius-sm);
        margin-bottom: 20px;
    }
    
    .section-header {
        flex-direction: column;
        text-align: center;
        gap: 12px;
        padding-bottom: 16px;
    }
    
    .section-icon {
        font-size: 2.4rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .section-intro {
        padding: 16px 20px;
        font-size: 1rem;
    }
    
    .step-item {
        flex-direction: column;
        gap: 16px;
        padding: 20px;
    }
    
    .step-header {
        margin-bottom: 12px;
    }
    
    .step-number {
        width: 40px;
        height: 40px;
        min-width: 40px;
        font-size: 1.1rem;
    }
    
    .step-header h4 {
        font-size: 1.2rem;
    }
    
    .intro-card {
        padding: 24px;
    }
    
    .intro-card h3 {
        font-size: 1.2rem;
    }
    
    .feature-list {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .feature-list li {
        font-size: 1rem;
    }
    
    .phone-screen {
        width: 100%;
        max-width: 280px;
        padding: 24px;
    }
    
    .sms-screen {
        width: 100%;
        max-width: 320px;
    }
    
    .settings-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }
    
    .setting-card {
        padding: 20px;
    }
    
    .setting-icon {
        font-size: 1.8rem;
        margin-bottom: 10px;
    }
    
    .tips-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .tip-card {
        padding: 24px;
    }
    
    .bottom-nav {
        padding: 20px 0;
        flex-wrap: wrap;
        gap: 12px;
    }
    
    .nav-btn {
        padding: 12px 22px;
        font-size: 0.95rem;
    }
    
    .page-indicator {
        font-size: 0.95rem;
        order: -1;
        width: 100%;
        text-align: center;
        margin-bottom: 8px;
    }
    
    .modal-content {
        max-height: 90vh;
        margin: 16px;
    }
    
    /* 图片画廊 */
    .image-gallery {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    .gallery-image-wrapper {
        aspect-ratio: 1;
    }
    
    /* 图片查看器 */
    .image-modal-zoom-in,
    .image-modal-zoom-out {
        display: none;
    }

    .image-modal-close {
        top: 16px;
        right: 16px;
        width: 52px;
        height: 52px;
        background: rgba(30, 41, 59, 0.95);
        border: 2px solid rgba(255, 255, 255, 0.4);
        box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
    }

    .image-modal-close svg {
        width: 26px;
        height: 26px;
        stroke-width: 2.5;
    }
    
    /* 灯箱 */
    .lightbox-nav {
        width: 48px;
        height: 48px;
        font-size: 1.3rem;
    }
    
    .lightbox-prev {
        left: 12px;
    }
    
    .lightbox-next {
        right: 12px;
    }
    
    .lightbox-image-wrapper {
        max-width: 92%;
    }
    
    .lightbox-caption {
        padding: 12px 20px;
        font-size: 0.95rem;
    }
    
    .lightbox-close {
        top: 16px;
        right: 16px;
        width: 48px;
        height: 48px;
    }
}

/* 小屏手机 (<576px) */
@media screen and (max-width: 480px) {
    html {
        font-size: 15px;
    }
    
    .header {
        padding: 0 12px;
    }
    
    .logo {
        font-size: 1.15rem;
        gap: 10px;
    }
    
    .logo-icon {
        width: 1.9rem;
        height: 1.9rem;
    }
    
    .logo-text {
        font-size: 0;
        white-space: nowrap;
    }
    
    .logo-text::before {
        content: attr(data-short-text);
        font-size: 1.15rem;
    }
    
    .menu-toggle {
        padding: 8px;
    }
    
    .main-content {
        padding: 16px;
    }
    
    .content-section {
        padding: 20px;
        margin-bottom: 16px;
        border-radius: var(--border-radius-xs);
    }
    
    .section-header {
        gap: 10px;
        margin-bottom: 20px;
    }
    
    .section-icon {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.35rem;
    }
    
    .section-intro {
        padding: 14px 16px;
        font-size: 0.95rem;
    }
    
    .step-guide {
        gap: 16px;
    }
    
    .step-item {
        padding: 16px;
        gap: 14px;
    }
    
    .step-header h4 {
        font-size: 1.1rem;
    }
    
    .step-content p {
        font-size: 0.95rem;
    }
    
    .phone-screen {
        padding: 20px;
        border-radius: 24px;
    }
    
    .key {
        font-size: 1.2rem;
    }
    
    .phone-display {
        font-size: 1.3rem;
        padding: 14px;
    }
    
    .sms-screen {
        padding: 16px;
    }
    
    .sms-header {
        font-size: 1rem;
    }
    
    .settings-grid {
        grid-template-columns: 1fr;
    }
    
    .faq-question {
        padding: 18px;
        font-size: 1rem;
    }
    
    .faq-answer {
        padding: 0 18px 18px 50px;
    }
    
    .bottom-nav {
        padding: 16px 0;
    }
    
    .nav-btn {
        flex: 1;
        justify-content: center;
        min-width: 90px;
        padding: 12px 16px;
    }
    
    .nav-text {
        display: none;
    }
    
    .intro-card {
        padding: 20px;
    }
    
    .intro-card h3 {
        font-size: 1.15rem;
        margin-bottom: 16px;
    }
    
    .intro-tip {
        padding: 18px;
    }
    
    .modal-content {
        max-width: 100%;
        margin: 12px;
        max-height: calc(100vh - 24px);
        border-radius: var(--border-radius);
    }
    
    .modal-header {
        padding: 18px 20px;
    }
    
    .modal-body {
        padding: 20px;
    }
    
    /* 图片画廊 */
    .image-gallery {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .gallery-image-wrapper {
        aspect-ratio: 16/10;
    }
    
    /* 灯箱 */
    .lightbox-nav {
        display: none;
    }
    
    .lightbox-caption {
        bottom: 20px;
        padding: 10px 18px;
        font-size: 0.9rem;
    }
    
    .lightbox-close {
        top: 12px;
        right: 12px;
        width: 44px;
        height: 44px;
    }
    
    /* 图片查看器 */
    .image-modal-wrapper {
        padding: 8px;
    }
    
    .image-modal-caption {
        font-size: 1rem;
        padding: 12px 20px;
    }
}

/* 超小屏手机 (<360px) */
@media screen and (max-width: 360px) {
    html {
        font-size: 14px;
    }
    
    .main-content {
        padding: 12px;
    }
    
    .content-section {
        padding: 16px;
    }
    
    .section-title {
        font-size: 1.25rem;
    }
    
    .step-number {
        width: 36px;
        height: 36px;
        font-size: 1rem;
    }
    
    .nav-btn {
        padding: 10px 12px;
    }
}

/* 横向屏幕模式 */
@media screen and (max-height: 500px) and (orientation: landscape) {
    .header {
        height: 52px;
    }
    
    .sidebar {
        top: 52px;
        height: calc(100vh - 52px);
    }
    
    .main-content {
        margin-top: 52px;
        min-height: calc(100vh - 52px);
        padding: 20px;
    }
    
    .content-section {
        padding: 24px;
    }
    
    .step-item {
        flex-direction: row;
        align-items: flex-start;
    }
    
    .modal-content {
        max-height: 92vh;
    }
    
    /* 隐藏一些非关键元素以节省空间 */
    .section-intro {
        padding: 14px 18px;
    }
}

/* 打印样式 */
@media print {
    .header,
    .sidebar,
    .bottom-nav,
    .search-results,
    .modal,
    .overlay,
    .reading-progress {
        display: none !important;
    }
    
    .main-content {
        margin: 0;
        padding: 20px;
    }
    
    .content-section {
        box-shadow: none;
        break-inside: avoid;
        page-break-inside: avoid;
        border: 1px solid #ddd;
        margin-bottom: 20px;
    }
    
    .section-header {
        border-bottom-color: #000;
    }
    
    body {
        background: white;
        color: black;
        font-size: 12pt;
    }
    
    .guide-image {
        max-width: 100%;
        page-break-inside: avoid;
    }
    
    .image-with-caption {
        break-inside: avoid;
        page-break-inside: avoid;
    }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
    
    .progress-fill {
        transition: none !important;
    }
}

/* 深色模式自动切换 */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --primary-color: #60a5fa;
        --primary-light: #93c5fd;
        --primary-dark: #3b82f6;
        --primary-gradient: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
        
        --bg-primary: #0f172a;
        --bg-secondary: #1e293b;
        --bg-tertiary: #334155;
        --bg-sidebar: #1e293b;
        --bg-hover: #334155;
        
        --text-primary: #f8fafc;
        --text-secondary: #cbd5e1;
        --text-muted: #64748b;
        
        --border-color: #334155;
        --border-light: #1e293b;
        --shadow-color: rgba(0, 0, 0, 0.3);
    }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000;
        --text-secondary: #333;
        --shadow-sm: none;
        --shadow: none;
        --shadow-md: none;
        --shadow-lg: none;
        --shadow-xl: none;
    }
    
    [data-theme="dark"] {
        --border-color: #fff;
        --text-secondary: #ddd;
    }
    
    .content-section,
    .step-item,
    .tip-card,
    .setting-card,
    .faq-item {
        border-width: 2px;
    }
    
    .nav-link.active {
        outline: 2px solid currentColor;
        outline-offset: 2px;
    }
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .nav-link:hover,
    .step-item:hover,
    .tip-card:hover,
    .setting-card:hover,
    .gallery-item:hover {
        transform: none;
    }
    
    .nav-link {
        padding: 14px 16px;
    }
    
    .nav-link:active {
        background: var(--bg-hover);
    }
    
    .key {
        min-height: 48px;
        min-width: 48px;
    }
    
    .demo-btn,
    .nav-btn,
    .app-install-btn,
    .send-btn,
    .call-btn {
        min-height: 48px;
    }
    
    /* 增大触摸目标 */
    .search-btn {
        min-width: 36px;
        min-height: 36px;
    }
    
    .theme-toggle {
        min-width: 44px;
        min-height: 44px;
    }
    
    /* 图片画廊触摸优化 */
    .gallery-overlay {
        opacity: 1;
        background: linear-gradient(to top, rgba(0,0,0,0.8) 0%, transparent 60%);
        padding-bottom: 16px;
    }
    
    .gallery-zoom {
        width: 44px;
        height: 44px;
        font-size: 1.5rem;
    }
}

/* iPad 和类似平板 */
@media screen and (min-width: 768px) and (max-width: 1024px) {
    .sidebar {
        width: 260px;
    }
    
    .main-content {
        margin-left: 260px;
    }
    
    .tips-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .image-gallery {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 折叠屏设备 */
@media screen and (max-width: 280px) {
    .logo-icon {
        font-size: 1.2rem;
    }
    
    .theme-toggle {
        width: 36px;
        height: 36px;
        font-size: 1rem;
    }
    
    .content-section {
        padding: 14px;
    }
    
    .section-title {
        font-size: 1.15rem;
    }
}