/* File-Rocket 2.0 Design System */
:root {
    --primary-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
    --primary-color: #6366f1;
    --secondary-color: #a855f7;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
    --text-main: #1f2937;
    --text-sub: #4b5563;
    --text-light: rgba(255, 255, 255, 0.9);
    --radius-lg: 24px;
    --radius-md: 16px;
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

/* 移动端触摸优化 */
.btn-primary, .card-button, .back-link, .code-box {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
    touch-action: manipulation;
}

/* 优化触摸反馈 */
.btn-primary:active, .card-button:active, .back-link:active, .code-box:active {
    transform: scale(0.98);
    transition: transform 0.1s ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    min-height: 100vh;
    color: var(--text-main);
    /* 动态流动背景 */
    background: linear-gradient(-45deg, #ee7752, #e73c7e, #23a6d5, #23d5ab);
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
    display: flex;
    flex-direction: column;
}

@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 1;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 60px;
    animation: slideDown 0.8s ease-out;
    flex-wrap: wrap; /* 允许换行防止重叠 */
    gap: 20px; /* 元素间最小间距 */
}

.logo {
    font-size: 2.2rem;
    font-weight: 800;
    color: white;
    text-shadow: 0 2px 10px rgba(0,0,0,0.1);
    letter-spacing: -1px;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0; /* 防止Logo被压缩 */
}

.subtitle {
    color: var(--text-light);
    font-weight: 500;
    font-size: 1.1rem;
    margin-top: 4px;
}

/* 返回按钮 - 玻璃拟态 */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    color: white;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.back-link:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

/* 移动端底部返回按钮 */
.mobile-back-btn {
    display: none; /* 默认隐藏，仅移动端显示 */
    margin-top: 40px;
    margin-bottom: 20px;
    padding: 14px 32px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 2px solid rgba(99, 102, 241, 0.3);
    border-radius: 20px;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.15);
    align-items: center;
    gap: 8px;
    justify-content: center;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}

.mobile-back-btn:hover {
    background: white;
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(99, 102, 241, 0.25);
    border-color: var(--primary-color);
}

/* 主内容区 */
.main-content, .upload-content, .receive-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
}

/* 卡片容器 - 统一布局 */
.action-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 40px;
    width: 100%;
    max-width: 900px;
    perspective: 1000px;
}

/* 通用卡片样式 - 玻璃拟态 */
.card, .upload-card, .receive-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: var(--radius-lg);
    padding: 50px 40px;
    text-align: center;
    box-shadow: var(--glass-shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    overflow: hidden;
}

/* 仅首页卡片的交互效果 */
.card {
    cursor: pointer;
    min-height: 420px;
    justify-content: center;
}
/* 已删除紫色上边框效果 */


.card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
    background: rgba(255, 255, 255, 0.85);
}
/* 已删除悬停时的上边框显示 */


/* 详情页卡片特定样式 */
.upload-card, .receive-card {
    max-width: 600px;
    width: 100%;
    min-height: 500px;
    justify-content: flex-start;
    animation: fadeInUp 0.6s ease-out;
}

.upload-card h2, .receive-card h2 {
    font-size: 2rem;
    margin-bottom: 40px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
}

/* 图标和文字 */
.card-icon {
    font-size: 4.5rem;
    margin-bottom: 25px;
    filter: drop-shadow(0 10px 10px rgba(0,0,0,0.1));
    transition: var(--transition);
}

.card:hover .card-icon {
    transform: scale(1.1) rotate(5deg);
}

.card h3 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-main);
}

.card p {
    color: var(--text-sub);
    margin-bottom: 35px;
    font-size: 1.1rem;
    line-height: 1.5;
}

/* 统一按钮样式 - 重构核心 */
.btn-primary, .card-button, .select-file-btn, .connect-btn, .generate-code-btn, .new-transfer-btn, .retry-btn, .send-btn, .receive-btn {
    background: var(--primary-gradient) !important;
    color: white !important;
    border: none !important;
    border-radius: 50px !important;
    padding: 0 !important; /* Reset padding for flex centering */
    width: 180px !important;
    height: 56px !important;
    font-size: 1.15rem !important;
    font-weight: 600 !important;
    cursor: pointer !important;
    transition: var(--transition) !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3) !important;
    text-decoration: none !important;
    position: relative !important;
    overflow: hidden !important;
    letter-spacing: 0.5px !important;
    white-space: nowrap !important;
    outline: none !important;
    line-height: 1 !important;
}

/* 按钮悬停光效 */
.btn-primary::after, .card-button::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(rgba(255,255,255,0.2), rgba(255,255,255,0));
    opacity: 0;
    transition: var(--transition);
}

.btn-primary:hover, .card-button:hover, .select-file-btn:hover, .connect-btn:hover, .send-btn:hover, .receive-btn:hover {
    transform: translateY(-2px) scale(1.02) !important;
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4) !important;
}

.btn-primary:hover::after {
    opacity: 1;
}

.btn-primary:active, .card-button:active {
    transform: translateY(1px);
}

.decline-btn {
    background: #f3f4f6;
    color: var(--text-main);
    border: none;
    border-radius: 50px;
    width: 140px;
    height: 56px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.decline-btn:hover {
    background: #e5e7eb;
    transform: translateY(-2px);
}

.accept-btn {
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: 50px;
    width: 140px;
    height: 56px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.accept-btn:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}


/* 交互区域优化 */
.file-drop-zone {
    border: 2px dashed #cbd5e1;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.5);
    padding: 60px 30px;
    width: 100%;
    min-height: 240px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    margin-bottom: 30px;
}

.file-drop-zone:hover, .file-drop-zone.drag-over {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
    transform: scale(1.01);
}

.code-input-section {
    width: 100%;
    padding: 40px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.8);
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* 分体式输入框设计 */
.code-input-wrapper {
    position: relative;
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 40px;
    cursor: text;
}

.code-box {
    width: 64px;
    height: 72px;
    background: white;
    border: 2px solid #e5e7eb;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

/* 激活状态（聚焦或有值） */
.code-box.active {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15);
    transform: translateY(-2px);
}

.code-box.filled {
    background: #f5f3ff;
    border-color: #8b5cf6;
}

/* 输入时的弹跳动画 */
@keyframes popBox {
    0% { transform: scale(0.95); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.code-box.pop {
    animation: popBox 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.input-hint {
    margin-top: 20px;
    color: var(--text-sub);
}

/* 取件码展示 */
.pickup-code-display {
    background: #f8fafc;
    border-radius: var(--radius-md);
    padding: 30px;
    margin-bottom: 30px;
    border: 2px dashed var(--primary-color);
    width: 100%;
}

.pickup-code {
    font-size: 3.5rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: 8px;
    font-family: 'Monaco', 'Courier New', monospace;
    margin: 15px 0;
}

/* 文件详情 */
.file-details {
    background: rgba(255, 255, 255, 0.6);
    padding: 25px;
    border-radius: var(--radius-md);
    margin-bottom: 30px;
    width: 100%;
    display: flex;
    align-items: center;
    gap: 20px;
}

.file-icon {
    font-size: 3rem;
}

.file-info {
    text-align: left;
}

.file-name {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 5px;
    display: block;
}

.file-size {
    color: var(--text-sub);
    font-size: 0.9rem;
}

/* 特性列表 */
.features {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 60px;
}

.feature {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: 12px 24px;
    border-radius: 50px;
    color: white;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition);
}

.feature:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

/* 进度条 */
.progress-container {
    width: 100%;
    background: #e2e8f0;
    height: 12px;
    border-radius: 10px;
    overflow: hidden;
    margin: 20px 0;
}

.progress-fill {
    height: 100%;
    background: var(--primary-gradient);
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
}

.progress-text {
    display: flex;
    justify-content: space-between;
    color: var(--text-sub);
    font-size: 0.9rem;
    font-weight: 500;
}

/* 状态指示器 */
.status-indicator {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 20px rgba(99, 102, 241, 0.3);
}

.pulse {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    animation: pulse 2s infinite;
    border: 4px solid white;
}

/* 成功/错误图标 */
.success-icon, .error-icon {
    font-size: 5rem;
    margin-bottom: 20px;
    display: inline-block;
    animation: popIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Footer */
.footer {
    text-align: center;
    color: rgba(255, 255, 255, 0.8);
    margin-top: auto;
    padding-top: 40px;
    font-size: 0.9rem;
}

/* 动画定义 */
@keyframes slideDown {
    from { transform: translateY(-20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@keyframes fadeInUp {
    from { transform: translateY(30px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@keyframes popIn {
    from { transform: scale(0); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

@keyframes pulse {
    0% { transform: scale(0.95); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.8; }
    100% { transform: scale(0.95); opacity: 1; }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

.shake {
    animation: shake 0.5s cubic-bezier(.36,.07,.19,.97) both;
    color: #dc3545; /* 强调错误颜色 */
}

.stage {
    display: none;
    width: 100%;
    animation: fadeInUp 0.5s ease-out;
}

.stage.active {
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* 响应式适配 */
/* === 平板端适配 (768px - 1024px) === */
@media (min-width: 769px) and (max-width: 1024px) {
    .container {
        padding: 40px 30px;
        max-width: 800px;
    }
    
    .card, .upload-card, .receive-card {
        padding: 40px 35px;
        max-width: 600px;
    }
    
    .pickup-code {
        font-size: 3rem;
        letter-spacing: 8px;
    }
    
    .code-input-wrapper {
        gap: 15px;
    }
    
    .code-box {
        width: 60px;
        height: 70px;
        font-size: 1.8rem;
    }
    
    .btn-primary, .card-button {
        padding: 16px 40px;
        font-size: 1.1rem;
        min-width: 200px;
    }
    
    .header h1 {
        font-size: 3rem;
    }
    
    .header p {
        font-size: 1.3rem;
    }
}

/* === 移动端适配 (小于768px) === */
@media (max-width: 768px) {
    .container {
        padding: 15px;
        margin: 0;
    }
    
    .header {
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 15px;
        margin-bottom: 20px;
        padding: 60px 10px 10px;
    }
    
    .logo {
        justify-content: center;
        width: 100%;
        margin-bottom: 5px;
        font-size: 2.8rem;
    }
    
    .subtitle {
        font-size: 1.1rem;
        text-align: center;
        width: 100%;
        margin-bottom: 20px;
        opacity: 0.9;
    }
    
    /* 移动端隐藏顶部返回按钮，显示底部按钮 */
    .header .back-link {
        display: none !important;
    }
    
    .mobile-back-btn {
        display: flex;
        margin-top: 30px;
        margin-bottom: 20px;
    }
    
    /* 首页双卡片横向排列优化 */
    .action-cards {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 15px;
        width: 100%;
        margin-top: 0px;
    }

    .action-cards .card {
        margin: 0;
        min-height: 220px;
        padding: 25px 15px;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        align-items: center;
        border-radius: 24px;
    }
    
    .action-cards .card-icon {
        font-size: 3rem;
        margin-bottom: 12px;
        margin-top: 5px;
    }
    
    .action-cards .card h3 {
        font-size: 1.3rem;
        margin-bottom: 8px;
        font-weight: 700;
    }
    
    .action-cards .card p {
        font-size: 0.85rem;
        margin-bottom: 15px;
        line-height: 1.3;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
        height: auto;
        min-height: 2.6em;
        width: 100%;
        opacity: 0.85;
    }
    
    .action-cards .btn-primary {
        width: 100% !important;
        height: 46px !important;
        font-size: 1.05rem !important;
        min-width: unset !important;
        padding: 0 !important;
        border-radius: 14px !important;
        margin: 0 !important;
    }

    /* 详情页卡片保持原样，但覆盖上面的通用card样式 */
    .upload-card, .receive-card {
        padding: 25px 20px;
        margin: 10px 0;
        border-radius: 20px;
        max-width: 100%;
    }
    
    .pickup-code {
        font-size: 3.2rem;
        letter-spacing: 8px;
        margin: 20px 0;
    }
    
    .code-input-wrapper {
        gap: 8px;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .code-box {
        width: 50px;
        height: 60px;
        font-size: 1.5rem;
        border-radius: 12px;
    }
    
    .btn-primary, .card-button {
        width: 100% !important;
        max-width: 280px;
        padding: 18px 20px;
        font-size: 1.1rem;
        margin: 15px auto;
        border-radius: 15px;
    }
    
    .send-btn, .receive-btn {
        width: 100% !important;
        padding: 18px 20px !important;
        font-size: 1.1rem !important;
    }
    
    /* 文件上传区域 */
    .file-drop-zone {
        padding: 30px 20px;
        min-height: 180px;
    }
    
    .file-drop-zone.drag-over {
        transform: scale(1.02);
    }
    
    .file-icon {
        font-size: 2.5rem;
    }
    
    /* 进度条优化 */
    .progress-container {
        margin: 20px 0;
    }
    
    .progress-bar {
        height: 8px;
        border-radius: 4px;
    }
    
    /* 状态指示器 */
    .status-container {
        margin: 20px 0;
        padding: 15px;
        border-radius: 15px;
    }
    
    .status-indicator {
        width: 70px;
        height: 70px;
        margin: 0 auto 20px;
    }
    
    /* 文件预览 */
    .file-preview {
        padding: 20px 15px;
        margin: 15px 0;
    }
}

/* === 超小屏幕适配 (小于480px) === */
@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    .header h1 {
        font-size: 1.8rem;
    }
    
    .header p {
        font-size: 0.9rem;
    }
    
    .card, .upload-card, .receive-card {
        padding: 20px 15px;
        margin: 5px 0;
        border-radius: 15px;
    }
    
    .pickup-code {
        font-size: 2.5rem;
        letter-spacing: 6px;
    }
    
    .code-input-wrapper {
        gap: 6px;
    }
    
    .code-box {
        width: 45px;
        height: 55px;
        font-size: 1.3rem;
        border-radius: 10px;
    }
    
    .btn-primary, .card-button {
        padding: 16px 18px;
        font-size: 1rem;
        border-radius: 12px;
    }
    
    .file-drop-zone {
        padding: 25px 15px;
        min-height: 160px;
    }
    
    .file-icon {
        font-size: 2rem;
    }
    
    /* 优化触摸交互 */
    .card-button, .btn-primary {
        min-height: 48px; /* iOS推荐的最小触摸区域 */
    }
    
    .code-box {
        min-height: 48px;
        min-width: 40px;
    }
}

/* === 横屏手机适配 === */
@media (max-width: 768px) and (orientation: landscape) {
    .container {
        padding: 10px 20px;
    }
    
    .header {
        margin-bottom: 20px;
    }
    
    .header h1 {
        font-size: 1.8rem;
    }
    
    .card, .upload-card, .receive-card {
        padding: 20px 25px;
        max-height: calc(100vh - 120px);
        overflow-y: auto;
    }
    
    .back-link {
        top: 10px;
        left: 10px;
        padding: 10px;
    }
}