/* ===== 全局变量与重置 ===== */
:root {
    --primary: #0066ff;
    --primary-light: #3385ff;
    --primary-dark: #0052cc;
    --accent: #00d4ff;
    --bg-dark: #0a1628;
    --bg-card: rgba(255, 255, 255, 0.05);
    --bg-input: rgba(255, 255, 255, 0.08);
    --text-primary: #ffffff;
    --text-secondary: #a0b4d0;
    --text-muted: #6b7f9e;
    --border: rgba(255, 255, 255, 0.1);
    --success: #00d68f;
    --danger: #ff4757;
    --warning: #ffa502;
    --radius: 12px;
    --radius-sm: 8px;
    --glow: 0 0 30px rgba(0, 102, 255, 0.3);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    font-size: 14px;
    line-height: 1.6;
    overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--primary-light); }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input { font-family: inherit; outline: none; border: none; background: none; color: inherit; }

/* ===== 粒子背景 ===== */
#particles {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* ===== 动画 ===== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}
@keyframes glow {
    0%, 100% { box-shadow: 0 0 20px rgba(0, 102, 255, 0.3); }
    50% { box-shadow: 0 0 40px rgba(0, 102, 255, 0.6); }
}
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}
@keyframes spin { to { transform: rotate(360deg); } }

.fade-in { animation: fadeIn 0.5s ease forwards; }
.fade-in-up { animation: fadeInUp 0.6s ease forwards; }
.shake { animation: shake 0.4s ease; }

/* ===== 登录注册页 ===== */
.auth-body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
    z-index: 1;
}
.auth-wrapper {
    width: 100%;
    max-width: 420px;
    position: relative;
    z-index: 1;
}
.auth-card {
    background: rgba(15, 25, 45, 0.85);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 40px 32px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}
.auth-logo {
    text-align: center;
    margin-bottom: 24px;
    position: relative;
}
.logo-glow {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 80px; height: 80px;
    background: radial-gradient(circle, rgba(0, 102, 255, 0.4), transparent);
    border-radius: 50%;
    animation: glow 2s infinite;
}
.logo-icon {
    font-size: 48px;
    position: relative;
    z-index: 1;
    animation: float 3s ease-in-out infinite;
}
.auth-title {
    text-align: center;
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 6px;
    background: linear-gradient(135deg, var(--accent), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.auth-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 13px;
    margin-bottom: 28px;
    letter-spacing: 2px;
}
.auth-form .form-group {
    position: relative;
    margin-bottom: 20px;
}
.input-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 16px;
    z-index: 1;
}
.auth-form input {
    width: 100%;
    padding: 14px 14px 14px 44px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 15px;
    transition: all 0.3s;
}
.auth-form input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.15);
    background: rgba(255, 255, 255, 0.1);
}
.input-line {
    position: absolute;
    bottom: 0; left: 50%;
    width: 0; height: 2px;
    background: var(--primary);
    transition: width 0.3s, left 0.3s;
}
.auth-form input:focus ~ .input-line {
    width: 100%; left: 0;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-align: center;
    border: none;
    position: relative;
    overflow: hidden;
}
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    box-shadow: var(--glow);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 102, 255, 0.4);
}
.btn-glow {
    width: 100%;
    padding: 14px;
    font-size: 16px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    border-radius: var(--radius-sm);
    margin-top: 8px;
    position: relative;
    overflow: hidden;
}
.btn-glow:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 212, 255, 0.4);
}
.btn-shine {
    position: absolute;
    top: 0; left: -100%;
    width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}
.btn-glow:hover .btn-shine { left: 100%; }
.btn-block { display: block; width: 100%; }
.btn-secondary {
    background: var(--bg-input);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}
.btn-secondary:hover { background: var(--border); color: var(--text-primary); }
.btn-xs { padding: 4px 10px; font-size: 12px; }
.btn-red { background: var(--danger); color: #fff; }
.btn-green { background: var(--success); color: #fff; }
.btn-orange { background: var(--warning); color: #fff; }
.btn-blue { background: var(--info, #1e90ff); color: #fff; }

/* ===== 提示框 ===== */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    font-size: 13px;
    animation: fadeIn 0.3s ease;
}
.alert-error {
    background: rgba(255, 71, 87, 0.1);
    border: 1px solid rgba(255, 71, 87, 0.3);
    color: var(--danger);
}
.alert-success {
    background: rgba(0, 214, 143, 0.1);
    border: 1px solid rgba(0, 214, 143, 0.3);
    color: var(--success);
}

.auth-footer {
    text-align: center;
    margin-top: 20px;
    font-size: 13px;
    color: var(--text-secondary);
}
.auth-footer .link { color: var(--accent); }
.auth-footer .divider { margin: 0 10px; color: var(--border); }
.auth-tip {
    text-align: center;
    margin-top: 12px;
    font-size: 11px;
    color: var(--text-muted);
}
.text-muted { color: var(--text-muted); }

/* ===== 主面板 ===== */
.dashboard-body {
    min-height: 100vh;
    position: relative;
    z-index: 1;
}
.topbar {
    height: 60px;
    background: rgba(10, 22, 40, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 100;
}
.topbar-left { display: flex; align-items: center; gap: 16px; }
.topbar-logo {
    font-size: 18px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.topbar-center { flex: 1; max-width: 400px; margin: 0 24px; }
.search-box {
    display: flex;
    align-items: center;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 0 16px;
    transition: all 0.3s;
}
.search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.15);
}
.search-box input {
    flex: 1;
    padding: 10px 8px;
    font-size: 14px;
    color: var(--text-primary);
}
.search-box button {
    color: var(--text-secondary);
    font-size: 16px;
    padding: 4px;
}
.topbar-right { display: flex; align-items: center; gap: 12px; }
.user-info {
    display: flex;
    align-items: center;
    gap: 8px;
}
.user-avatar {
    width: 32px; height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
}
.user-name { font-size: 14px; font-weight: 500; }
.topbar-btn {
    width: 36px; height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: all 0.2s;
    background: var(--bg-input);
}
.topbar-btn:hover {
    background: var(--primary);
    transform: scale(1.1);
}

.main-layout {
    display: flex;
    min-height: calc(100vh - 60px);
    position: relative;
    z-index: 1;
}

/* 侧边栏 */
.sidebar {
    width: 240px;
    background: rgba(15, 25, 45, 0.6);
    backdrop-filter: blur(10px);
    border-right: 1px solid var(--border);
    padding: 20px 16px;
    flex-shrink: 0;
}
.btn-upload {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 20px;
    position: relative;
    overflow: hidden;
    transition: all 0.3s;
    display: block;
    text-align: center;
}
.btn-upload:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 212, 255, 0.4);
}
.storage-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 20px;
}
.storage-title {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}
.storage-bar {
    height: 8px;
    background: var(--bg-input);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 8px;
}
.storage-bar.large { height: 12px; }
.storage-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 4px;
    transition: width 0.5s ease;
}
.storage-info {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    color: var(--text-muted);
}
.side-menu { display: flex; flex-direction: column; gap: 4px; }
.side-item {
    display: flex;
    align-items: center;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 14px;
    transition: all 0.2s;
}
.side-item:hover {
    background: var(--bg-input);
    color: var(--text-primary);
}
.side-item.active {
    background: rgba(0, 102, 255, 0.15);
    color: var(--accent);
    font-weight: 600;
}
.side-icon { margin-right: 10px; font-size: 16px; }
.side-count {
    margin-left: auto;
    background: var(--bg-input);
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    color: var(--text-muted);
}

/* 主内容 */
.main-content {
    flex: 1;
    padding: 24px;
    min-width: 0;
}
.content-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}
.content-header h2 { font-size: 20px; font-weight: 700; }
.sort-select {
    padding: 8px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 13px;
    cursor: pointer;
}

/* 上传进度 */
.upload-progress {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 20px;
    animation: fadeIn 0.3s ease;
}
.progress-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 13px;
}
.progress-bar {
    height: 6px;
    background: var(--bg-input);
    border-radius: 3px;
    overflow: hidden;
}
.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 3px;
    transition: width 0.3s ease;
}

/* 文件网格 */
.file-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
}
.file-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}
.file-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: 0 10px 30px rgba(0, 102, 255, 0.2);
}
.file-icon {
    font-size: 48px;
    margin-bottom: 12px;
    animation: float 3s ease-in-out infinite;
}
.file-name {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 6px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.file-meta {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 12px;
    display: flex;
    justify-content: center;
    gap: 4px;
}
.file-actions {
    display: flex;
    justify-content: center;
    gap: 6px;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.3s;
}
.file-card:hover .file-actions {
    opacity: 1;
    transform: translateY(0);
}
.file-btn {
    width: 32px; height: 32px;
    border-radius: 50%;
    background: var(--bg-input);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    transition: all 0.2s;
}
.file-btn:hover {
    background: var(--primary);
    transform: scale(1.15);
}
.btn-delete:hover { background: var(--danger); }
.btn-rename:hover { background: var(--warning); }

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-muted);
}
.empty-state .empty-icon { font-size: 64px; margin-bottom: 16px; }
.empty-state h3 { font-size: 18px; margin-bottom: 8px; color: var(--text-secondary); }
.empty-state p { font-size: 14px; }

/* 弹窗 */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}
.modal.show { display: flex; }
.modal-content {
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    width: 90%;
    max-width: 400px;
    animation: fadeInUp 0.3s ease;
}
.modal-content h3 { margin-bottom: 16px; font-size: 18px; }
.modal-content input[type="text"] {
    width: 100%;
    padding: 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    margin-bottom: 16px;
}
.modal-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

/* Toast */
.toast {
    position: fixed;
    top: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(-100px);
    padding: 12px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    z-index: 2000;
    opacity: 0;
    transition: all 0.3s;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}
.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}
.toast.success { border-color: var(--success); color: var(--success); }
.toast.error { border-color: var(--danger); color: var(--danger); }

/* ===== 分享页 ===== */
.file-detail-card {
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 20px;
}
.file-detail-icon { font-size: 48px; }
.file-detail-info h3 { font-size: 18px; margin-bottom: 6px; }
.file-detail-info p { font-size: 13px; color: var(--text-secondary); }
.share-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
}
.share-card h3 { margin-bottom: 16px; font-size: 16px; }
.share-form .form-group { margin-bottom: 16px; }
.share-form label {
    display: block;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 6px;
}
.share-form input {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
}
.share-result { margin-top: 20px; }
.share-result label { font-size: 13px; color: var(--text-secondary); display: block; margin-bottom: 8px; }
.share-link-box {
    display: flex;
    gap: 8px;
}
.share-link-box input {
    flex: 1;
    padding: 10px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--accent);
    font-size: 13px;
}
.share-tip {
    margin-top: 10px;
    font-size: 12px;
    color: var(--text-muted);
}
.share-list { margin-top: 16px; }
.share-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
}
.share-item-icon { font-size: 24px; }
.share-item-info { flex: 1; }
.share-item-name { font-size: 14px; font-weight: 500; }
.share-item-meta { font-size: 11px; color: var(--text-muted); margin-top: 2px; }

/* ===== 个人中心 ===== */
.profile-card {
    display: flex;
    align-items: center;
    gap: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    margin-bottom: 20px;
}
.profile-avatar {
    width: 80px; height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    font-weight: 700;
}
.profile-info h2 { font-size: 22px; margin-bottom: 8px; }
.profile-info p { font-size: 14px; color: var(--text-secondary); margin-bottom: 4px; }
.stats-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 20px;
}
.stat-box {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
    transition: all 0.3s;
}
.stat-box:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
}
.stat-num {
    font-size: 24px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 4px;
}
.stat-label { font-size: 12px; color: var(--text-muted); }
.settings-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
}
.settings-card h3 { margin-bottom: 16px; font-size: 16px; }
.settings-form .form-group { margin-bottom: 16px; }
.settings-form label {
    display: block;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 6px;
}
.settings-form input {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
}

/* ===== 后台管理 ===== */
.admin-body {
    background: #f0f2f5;
    color: #333;
    min-height: 100vh;
}
.admin-layout { display: flex; min-height: 100vh; }
.admin-sidebar {
    width: 200px;
    background: linear-gradient(180deg, #0a1628, #1a2a4a);
    color: #fff;
    flex-shrink: 0;
}
.admin-logo {
    padding: 20px 16px;
    font-size: 16px;
    font-weight: 700;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.admin-menu { list-style: none; padding: 8px 0; }
.admin-menu li a {
    display: block;
    padding: 12px 20px;
    color: rgba(255,255,255,0.7);
    font-size: 14px;
    transition: all 0.2s;
}
.admin-menu li a:hover,
.admin-menu li a.active {
    background: rgba(0, 102, 255, 0.3);
    color: #fff;
}
.admin-main {
    flex: 1;
    padding: 24px;
    min-width: 0;
}
.admin-main h1 { font-size: 22px; margin-bottom: 20px; color: #1a1a1a; }
.admin-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}
.admin-stat {
    background: #fff;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    display: flex;
    align-items: center;
    gap: 14px;
    transition: all 0.3s;
}
.admin-stat:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.1);
}
.admin-stat-icon { font-size: 32px; }
.admin-stat-num { font-size: 22px; font-weight: 700; color: #1a1a1a; }
.admin-stat-label { font-size: 12px; color: #888; }
.admin-panels {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.admin-panel {
    background: #fff;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    margin-bottom: 20px;
}
.admin-panel h2 { font-size: 16px; margin-bottom: 16px; color: #1a1a1a; }
.admin-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
.admin-table th,
.admin-table td {
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid #f0f0f0;
}
.admin-table th {
    background: #fafafa;
    color: #888;
    font-weight: 600;
    font-size: 12px;
}
.admin-table tr:hover td { background: #f9f9f9; }
.admin-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 600;
}
.admin-badge-green { background: #e8f5e9; color: #4caf50; }
.admin-badge-red { background: #ffebee; color: #f44336; }
.admin-btn {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}
.admin-btn:hover { opacity: 0.85; }
.admin-btn-primary { background: #0066ff; color: #fff; }
.admin-btn-gray { background: #f0f0f0; color: #666; }
.admin-btn-red { background: #f44336; color: #fff; }
.admin-btn-green { background: #4caf50; color: #fff; }
.admin-btn-orange { background: #ff9800; color: #fff; }
.admin-btn-blue { background: #2196f3; color: #fff; }
.admin-btn-xs { padding: 3px 8px; font-size: 11px; }
.admin-toolbar { margin-bottom: 16px; }
.admin-search { display: flex; gap: 8px; }
.admin-search input {
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 13px;
}
.admin-actions { white-space: nowrap; }
.admin-actions form { display: inline; }
.panel-footer {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid #f0f0f0;
    text-align: right;
}
.admin-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-top: 16px;
    font-size: 13px;
    color: #666;
}

/* 设置开关 */
.setting-row {
    padding: 16px 0;
    border-bottom: 1px solid #f0f0f0;
}
.setting-row:last-child { border-bottom: none; }
.switch-label {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
}
.switch-label input[type="checkbox"] { display: none; }
.switch {
    width: 44px; height: 24px;
    background: #ccc;
    border-radius: 12px;
    position: relative;
    transition: background 0.3s;
}
.switch::after {
    content: '';
    position: absolute;
    top: 2px; left: 2px;
    width: 20px; height: 20px;
    background: #fff;
    border-radius: 50%;
    transition: transform 0.3s;
}
.switch-label input:checked ~ .switch { background: #0066ff; }
.switch-label input:checked ~ .switch::after { transform: translateX(20px); }
.switch-text { font-size: 14px; font-weight: 500; color: #333; }
.setting-desc { font-size: 12px; color: #999; margin-top: 6px; margin-left: 56px; }
.settings-form .form-group { margin-bottom: 16px; }
.settings-form label {
    display: block;
    font-size: 13px;
    color: #666;
    margin-bottom: 6px;
}
.settings-form input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .sidebar { width: 60px; padding: 12px 8px; }
    .sidebar .side-item span:not(.side-icon),
    .sidebar .storage-card,
    .sidebar .btn-upload span { display: none; }
    .sidebar .btn-upload { padding: 12px; font-size: 20px; }
    .main-content { padding: 16px; }
    .file-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 10px; }
    .file-card { padding: 14px; }
    .file-icon { font-size: 36px; }
    .topbar-center { display: none; }
    .stats-row { grid-template-columns: repeat(2, 1fr); }
    .admin-panels { grid-template-columns: 1fr; }
    .admin-layout { flex-direction: column; }
    .admin-sidebar { width: 100%; }
    .admin-menu { display: flex; overflow-x: auto; }
    .admin-menu li a { padding: 10px 14px; white-space: nowrap; }
}
@media (max-width: 480px) {
    .auth-card { padding: 28px 20px; }
    .file-grid { grid-template-columns: 1fr 1fr; }
    .profile-card { flex-direction: column; text-align: center; }
}


/* ============================================
   高级科技风首页样式
   ============================================ */

/* 背景装饰 */
.bg-grid {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-image:
        linear-gradient(rgba(0, 102, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 102, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    z-index: 0;
    pointer-events: none;
}
.bg-glow {
    position: fixed;
    border-radius: 50%;
    filter: blur(100px);
    z-index: 0;
    pointer-events: none;
    opacity: 0.4;
}
.bg-glow-1 {
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(0, 102, 255, 0.3), transparent);
    top: -100px; right: -100px;
    animation: glowFloat 8s ease-in-out infinite;
}
.bg-glow-2 {
    width: 400px; height: 400px;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.25), transparent);
    bottom: 10%; left: -100px;
    animation: glowFloat 10s ease-in-out infinite reverse;
}
@keyframes glowFloat {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(30px, -30px); }
}

/* 顶部导航 */
.landing-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 0 32px;
    background: rgba(10, 22, 40, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.nav-inner {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}
.landing-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}
.logo-icon-wrap {
    position: relative;
    width: 36px; height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.logo-icon {
    font-size: 22px;
    position: relative;
    z-index: 1;
}
.logo-ring {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    border: 1px solid rgba(0, 212, 255, 0.4);
    border-radius: 10px;
    animation: ringPulse 3s ease-in-out infinite;
}
@keyframes ringPulse {
    0%, 100% { transform: rotate(0deg); opacity: 0.5; }
    50% { transform: rotate(180deg); opacity: 1; }
}
.logo-text {
    font-size: 18px;
    font-weight: 700;
    background: linear-gradient(135deg, #fff, var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.5px;
}
.nav-links {
    display: flex;
    gap: 32px;
}
.nav-links a {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px; left: 0;
    width: 0; height: 2px;
    background: var(--accent);
    transition: width 0.3s;
}
.nav-links a:hover {
    color: #fff;
}
.nav-links a:hover::after {
    width: 100%;
}
.landing-nav-btns {
    display: flex;
    align-items: center;
    gap: 12px;
}
.landing-user {
    color: var(--text-secondary);
    font-size: 13px;
    margin-right: 4px;
}

/* 按钮 */
.landing-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 9px 20px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    white-space: nowrap;
}
.landing-btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    box-shadow: 0 4px 20px rgba(0, 102, 255, 0.35);
    position: relative;
    overflow: hidden;
}
.landing-btn-primary::before {
    content: '';
    position: absolute;
    top: 0; left: -100%;
    width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}
.landing-btn-primary:hover::before {
    left: 100%;
}
.landing-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 212, 255, 0.45);
    color: #fff;
}
.landing-btn-outline {
    background: rgba(255, 255, 255, 0.05);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
}
.landing-btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
}
.landing-btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}
.landing-btn-ghost:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.05);
}
.landing-btn-lg {
    padding: 14px 32px;
    font-size: 15px;
    border-radius: 12px;
}
.btn-arrow {
    display: inline-block;
    transition: transform 0.3s;
}
.landing-btn:hover .btn-arrow {
    transform: translateX(4px);
}

/* 主视觉区 */
.landing-hero {
    position: relative;
    z-index: 1;
    padding: 80px 32px 100px;
}
.hero-inner {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 60px;
    align-items: center;
}
.hero-content {
    animation: fadeInUp 0.8s ease;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 16px;
    background: rgba(0, 212, 255, 0.08);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: 20px;
    font-size: 13px;
    color: var(--accent);
    margin-bottom: 24px;
    font-weight: 500;
}
.badge-dot {
    width: 6px; height: 6px;
    background: var(--accent);
    border-radius: 50%;
    animation: dotPulse 2s ease-in-out infinite;
}
@keyframes dotPulse {
    0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(0, 212, 255, 0.5); }
    50% { opacity: 0.7; box-shadow: 0 0 0 6px rgba(0, 212, 255, 0); }
}
.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 24px;
    letter-spacing: -1px;
}
.title-line {
    display: block;
    color: #fff;
}
.gradient-text {
    background: linear-gradient(135deg, var(--accent) 0%, var(--primary) 50%, #fff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-desc {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 36px;
    max-width: 520px;
}
.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}
.hero-trust {
    display: flex;
    gap: 28px;
    flex-wrap: wrap;
}
.trust-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
}
.trust-icon {
    font-size: 16px;
}

/* 右侧视觉 - 仪表盘模拟 */
.hero-visual {
    position: relative;
    animation: fadeIn 1s ease 0.3s both;
}
.visual-glow {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 400px; height: 400px;
    background: radial-gradient(circle, rgba(0, 102, 255, 0.2), transparent 70%);
    filter: blur(40px);
    z-index: 0;
}
.dashboard-mockup {
    position: relative;
    z-index: 1;
    background: rgba(15, 25, 45, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5), 0 0 60px rgba(0, 102, 255, 0.1);
    animation: mockupFloat 6s ease-in-out infinite;
}
@keyframes mockupFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}
.mockup-header {
    display: flex;
    align-items: center;
    padding: 14px 18px;
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    gap: 12px;
}
.mockup-dots {
    display: flex;
    gap: 6px;
}
.mockup-dots span {
    width: 10px; height: 10px;
    border-radius: 50%;
}
.mockup-dots span:nth-child(1) { background: #ff5f57; }
.mockup-dots span:nth-child(2) { background: #febc2e; }
.mockup-dots span:nth-child(3) { background: #28c840; }
.mockup-title {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 600;
}
.mockup-search {
    margin-left: auto;
    font-size: 12px;
    color: var(--text-muted);
    padding: 5px 12px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
}
.mockup-sidebar {
    position: absolute;
    left: 0; top: 49px; bottom: 0;
    width: 130px;
    padding: 16px 12px;
    background: rgba(0, 0, 0, 0.2);
    border-right: 1px solid rgba(255, 255, 255, 0.06);
}
.mockup-menu-item {
    padding: 8px 10px;
    border-radius: 8px;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 4px;
    cursor: pointer;
    transition: all 0.2s;
}
.mockup-menu-item.active {
    background: rgba(0, 102, 255, 0.2);
    color: var(--accent);
    font-weight: 600;
}
.mockup-storage {
    position: absolute;
    bottom: 16px; left: 12px; right: 12px;
}
.storage-label {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 6px;
}
.storage-bar-mock {
    height: 5px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 4px;
}
.storage-fill-mock {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 3px;
}
.storage-text {
    font-size: 10px;
    color: var(--text-muted);
}
.mockup-content {
    margin-left: 130px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-height: 320px;
}
.mockup-file-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    transition: all 0.2s;
}
.mockup-file-card:hover {
    background: rgba(0, 102, 255, 0.08);
    border-color: rgba(0, 102, 255, 0.2);
}
.file-icon-lg {
    font-size: 24px;
    width: 36px; height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
}
.file-info-mock {
    flex: 1;
    min-width: 0;
}
.file-name-mock {
    font-size: 13px;
    color: #fff;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.file-meta-mock {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 2px;
}
.file-actions-mock {
    font-size: 12px;
    opacity: 0.5;
    letter-spacing: 4px;
}
.mockup-upload-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.1), rgba(0, 212, 255, 0.05));
    border: 1px solid rgba(0, 102, 255, 0.2);
    border-radius: 10px;
}
.upload-icon {
    font-size: 20px;
    animation: uploadBounce 1.5s ease-in-out infinite;
}
@keyframes uploadBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
}
.upload-text {
    flex: 1;
    font-size: 12px;
    color: var(--text-secondary);
}
.upload-bar {
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
    margin-top: 6px;
}
.upload-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 2px;
    animation: uploadProgress 2s ease-in-out infinite;
}
@keyframes uploadProgress {
    0% { width: 0%; }
    50% { width: 78%; }
    100% { width: 78%; }
}
.upload-percent {
    font-size: 11px;
    color: var(--accent);
    margin-top: 4px;
    font-weight: 600;
}

/* 浮动卡片 */
.float-card {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: rgba(15, 25, 45, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    z-index: 2;
}
.float-card-1 {
    top: 10%;
    right: -20px;
    animation: floatCard1 5s ease-in-out infinite;
}
.float-card-2 {
    bottom: 15%;
    left: -30px;
    animation: floatCard2 6s ease-in-out infinite;
}
@keyframes floatCard1 {
    0%, 100% { transform: translateY(0) rotate(-2deg); }
    50% { transform: translateY(-10px) rotate(0deg); }
}
@keyframes floatCard2 {
    0%, 100% { transform: translateY(0) rotate(2deg); }
    50% { transform: translateY(-8px) rotate(0deg); }
}
.float-card-icon {
    font-size: 20px;
    width: 36px; height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 214, 143, 0.15);
    border-radius: 10px;
}
.float-card-2 .float-card-icon {
    background: rgba(0, 102, 255, 0.15);
}
.float-card-title {
    font-size: 13px;
    color: #fff;
    font-weight: 600;
}
.float-card-desc {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 2px;
}

/* 数据统计 */
.landing-stats {
    position: relative;
    z-index: 1;
    padding: 0 32px 80px;
}
.stats-inner {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.stat-card {
    text-align: center;
    padding: 32px 20px;
    background: rgba(15, 25, 45, 0.5);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 16px;
    transition: all 0.3s;
}
.stat-card:hover {
    transform: translateY(-4px);
    border-color: rgba(0, 102, 255, 0.3);
    box-shadow: 0 10px 40px rgba(0, 102, 255, 0.15);
}
.stat-num {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 8px;
    letter-spacing: -1px;
}
.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
}

/* 功能特性 */
.landing-features {
    position: relative;
    z-index: 1;
    padding: 80px 32px;
}
.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 56px;
}
.section-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(0, 212, 255, 0.08);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: 20px;
    font-size: 12px;
    color: var(--accent);
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 20px;
    text-transform: uppercase;
}
.section-title {
    font-size: 40px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 16px;
    color: #fff;
    letter-spacing: -0.5px;
}
.section-desc {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
}
.features-grid {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.feature-card {
    position: relative;
    padding: 32px 28px;
    background: rgba(15, 25, 45, 0.5);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 18px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}
.feature-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0;
    transition: opacity 0.3s;
}
.feature-card:hover {
    transform: translateY(-8px);
    border-color: rgba(0, 102, 255, 0.3);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 102, 255, 0.1);
}
.feature-card:hover::before {
    opacity: 1;
}
.feature-icon-wrap {
    position: relative;
    width: 56px; height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}
.feature-icon-glow {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: radial-gradient(circle, rgba(0, 102, 255, 0.3), transparent 70%);
    filter: blur(8px);
    border-radius: 16px;
}
.feature-icon {
    font-size: 28px;
    position: relative;
    z-index: 1;
    width: 56px; height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 102, 255, 0.1);
    border: 1px solid rgba(0, 102, 255, 0.2);
    border-radius: 16px;
}
.feature-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
    color: #fff;
}
.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 使用流程 */
.landing-how {
    position: relative;
    z-index: 1;
    padding: 80px 32px;
}
.how-steps {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
}
.how-step {
    flex: 1;
    text-align: center;
    padding: 0 20px;
    position: relative;
}
.step-number {
    font-size: 64px;
    font-weight: 900;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.3), rgba(0, 102, 255, 0.1));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 12px;
}
.step-icon {
    font-size: 40px;
    margin-bottom: 16px;
    display: inline-block;
    animation: stepFloat 3s ease-in-out infinite;
}
.how-step:nth-child(3) .step-icon { animation-delay: 0.5s; }
.how-step:nth-child(5) .step-icon { animation-delay: 1s; }
@keyframes stepFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}
.how-step h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 8px;
    color: #fff;
}
.how-step p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}
.step-line {
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    margin-top: 60px;
    flex-shrink: 0;
    opacity: 0.5;
}

/* CTA */
.landing-cta {
    position: relative;
    z-index: 1;
    padding: 80px 32px 100px;
}
.cta-card {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
    padding: 64px 40px;
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.15), rgba(0, 212, 255, 0.08));
    backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 102, 255, 0.2);
    border-radius: 24px;
    overflow: hidden;
}
.cta-glow {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 500px; height: 300px;
    background: radial-gradient(ellipse, rgba(0, 102, 255, 0.2), transparent 70%);
    filter: blur(40px);
    pointer-events: none;
}
.cta-card h2 {
    position: relative;
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 12px;
    color: #fff;
}
.cta-card p {
    position: relative;
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}
.cta-card .hero-buttons {
    position: relative;
    justify-content: center;
    margin-bottom: 0;
}

/* 页脚 */
.landing-footer {
    position: relative;
    z-index: 1;
    padding: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    background: rgba(10, 22, 40, 0.5);
}
.footer-inner {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}
.footer-logo {
    font-size: 16px;
    font-weight: 700;
    color: #fff;
}
.footer-links {
    display: flex;
    gap: 24px;
}
.footer-links a {
    font-size: 13px;
    color: var(--text-secondary);
    transition: color 0.3s;
}
.footer-links a:hover {
    color: var(--accent);
}
.footer-copy {
    font-size: 12px;
    color: var(--text-muted);
}

/* 响应式 */
@media (max-width: 1024px) {
    .hero-inner {
        grid-template-columns: 1fr;
        gap: 60px;
    }
    .hero-title {
        font-size: 44px;
    }
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .stats-inner {
        grid-template-columns: repeat(2, 1fr);
    }
    .nav-links {
        display: none;
    }
}
@media (max-width: 768px) {
    .landing-nav {
        padding: 0 16px;
    }
    .nav-inner {
        height: 60px;
    }
    .logo-text {
        font-size: 16px;
    }
    .landing-user {
        display: none;
    }
    .landing-hero {
        padding: 48px 16px 64px;
    }
    .hero-title {
        font-size: 36px;
    }
    .hero-desc {
        font-size: 15px;
    }
    .hero-buttons {
        flex-direction: column;
    }
    .hero-buttons .landing-btn {
        width: 100%;
    }
    .hero-trust {
        gap: 16px;
    }
    .dashboard-mockup {
        transform: scale(0.9);
        transform-origin: center;
    }
    .float-card-1 {
        right: 0;
        top: 5%;
    }
    .float-card-2 {
        left: 0;
        bottom: 10%;
    }
    .landing-stats,
    .landing-features,
    .landing-how,
    .landing-cta {
        padding: 48px 16px;
    }
    .section-title {
        font-size: 28px;
    }
    .features-grid {
        grid-template-columns: 1fr;
    }
    .how-steps {
        flex-direction: column;
        align-items: center;
        gap: 32px;
    }
    .step-line {
        width: 2px;
        height: 40px;
        margin-top: 0;
    }
    .cta-card {
        padding: 40px 24px;
    }
    .cta-card h2 {
        font-size: 26px;
    }
    .footer-inner {
        flex-direction: column;
        text-align: center;
    }
}
@media (max-width: 480px) {
    .hero-title {
        font-size: 30px;
    }
    .stat-num {
        font-size: 28px;
    }
    .mockup-sidebar {
        display: none;
    }
    .mockup-content {
        margin-left: 0;
    }
    .dashboard-mockup {
        transform: scale(1);
    }
}

/* ============================================

/* ============================================
   未来存储云 - 深色科技风首页
   ============================================ */
.fsc-body {
    margin: 0;
    padding: 0;
    background: #050810;
    color: #fff;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    min-height: 100vh;
    overflow-x: hidden;
}

/* 顶部导航 */
.fsc-topnav {
    background: #0a0e1a;
    padding: 14px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.fsc-topnav-left {
    display: flex;
    align-items: center;
    gap: 10px;
}
.fsc-topnav-icon {
    font-size: 20px;
}
.fsc-topnav-title {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.85);
    font-weight: 500;
}
.fsc-topnav-right {
    display: flex;
    gap: 20px;
}
.fsc-topnav-link {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}
.fsc-topnav-link:hover {
    color: #4a9eff;
}

/* 品牌区 */
.fsc-brand {
    background: #0a0e1a;
    padding: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.fsc-brand-cn {
    font-size: 32px;
    font-weight: 700;
    color: #4a9eff;
    margin: 0 0 4px 0;
    letter-spacing: 2px;
}
.fsc-brand-en {
    font-size: 20px;
    color: #6ba3ff;
    margin: 0;
    font-weight: 400;
    letter-spacing: 1px;
}
.fsc-brand-right {
    display: flex;
    gap: 16px;
}
.fsc-brand-btn {
    width: 72px;
    height: 72px;
    border-radius: 14px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s;
    line-height: 1.4;
}
.fsc-brand-btn span {
    display: block;
}
.fsc-brand-btn-outline {
    background: transparent;
    border: 1.5px solid rgba(74, 158, 255, 0.5);
    color: #4a9eff;
}
.fsc-brand-btn-outline:hover {
    border-color: #4a9eff;
    background: rgba(74, 158, 255, 0.1);
    transform: translateY(-2px);
}
.fsc-brand-btn-primary {
    background: linear-gradient(135deg, #2563eb, #4a9eff);
    color: #fff;
    border: none;
    box-shadow: 0 4px 20px rgba(37, 99, 235, 0.4);
}
.fsc-brand-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 28px rgba(37, 99, 235, 0.55);
}

/* 主视觉区 */
.fsc-hero {
    position: relative;
    min-height: 520px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: radial-gradient(ellipse at center, #0d1525 0%, #050810 70%);
}
#network-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}
.fsc-hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 40px 24px;
    max-width: 900px;
}
.fsc-hero-title {
    font-size: 52px;
    font-weight: 800;
    margin: 0 0 24px 0;
    line-height: 1.3;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
}
.fsc-hero-cn {
    background: linear-gradient(135deg, #4a9eff, #6ba3ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.fsc-hero-dot {
    color: #4a9eff;
    font-size: 40px;
}
.fsc-hero-en {
    background: linear-gradient(135deg, #8b5cf6, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 44px;
}
.fsc-hero-desc {
    font-size: 17px;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.9;
    margin: 0 auto 36px;
    max-width: 720px;
}
.fsc-hero-buttons {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 560px;
    margin: 0 auto 28px;
}
.fsc-hero-btn {
    display: block;
    padding: 18px 32px;
    border-radius: 16px;
    text-decoration: none;
    font-size: 18px;
    font-weight: 600;
    transition: all 0.3s;
    text-align: center;
}
.fsc-hero-btn-primary {
    background: linear-gradient(135deg, #2563eb, #4a9eff, #8b5cf6);
    color: #fff;
    box-shadow: 0 6px 30px rgba(37, 99, 235, 0.4);
}
.fsc-hero-btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 40px rgba(37, 99, 235, 0.55);
    color: #fff;
}
.fsc-hero-btn-secondary {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(74, 158, 255, 0.2));
    border: 1px solid rgba(139, 92, 246, 0.4);
    color: #c4b5fd;
    backdrop-filter: blur(10px);
}
.fsc-hero-btn-secondary:hover {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.3), rgba(74, 158, 255, 0.3));
    border-color: rgba(139, 92, 246, 0.6);
    transform: translateY(-3px);
    color: #ddd6fe;
}
.fsc-hero-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    font-size: 14px;
}
.fsc-hero-link {
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    transition: color 0.3s;
}
.fsc-hero-link:hover {
    color: #4a9eff;
}
.fsc-link-divider {
    color: rgba(255, 255, 255, 0.2);
}

/* 功能卡片区 */
.fsc-features {
    padding: 40px 24px 60px;
    background: #050810;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    max-width: 1100px;
    margin: 0 auto;
}
.fsc-feature-card {
    background: rgba(13, 21, 37, 0.8);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 20px;
    padding: 32px 28px;
    transition: all 0.3s;
}
.fsc-feature-card:hover {
    border-color: rgba(74, 158, 255, 0.3);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}
.fsc-feature-title {
    font-size: 22px;
    font-weight: 700;
    color: #6ba3ff;
    margin: 0 0 14px 0;
}
.fsc-feature-desc {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.55);
    line-height: 1.9;
    margin: 0;
}

/* 页脚 */
.fsc-footer {
    background: #0a0e1a;
    padding: 24px;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}
.fsc-footer p {
    margin: 0;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.35);
}

/* 响应式 */
@media (max-width: 768px) {
    .fsc-topnav-title {
        font-size: 13px;
    }
    .fsc-topnav-right {
        gap: 14px;
    }
    .fsc-brand {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    .fsc-brand-cn {
        font-size: 26px;
    }
    .fsc-brand-en {
        font-size: 16px;
    }
    .fsc-brand-btn {
        width: 64px;
        height: 64px;
        font-size: 14px;
    }
    .fsc-hero {
        min-height: 480px;
    }
    .fsc-hero-title {
        font-size: 36px;
        flex-direction: column;
        gap: 4px;
    }
    .fsc-hero-en {
        font-size: 28px;
    }
    .fsc-hero-dot {
        display: none;
    }
    .fsc-hero-desc {
        font-size: 15px;
    }
    .fsc-hero-btn {
        font-size: 16px;
        padding: 16px 24px;
    }
    .fsc-features {
        grid-template-columns: 1fr;
        padding: 24px 16px 40px;
    }
    .fsc-feature-card {
        padding: 24px 20px;
    }
    .fsc-feature-title {
        font-size: 18px;
    }
}
@media (max-width: 480px) {
    .fsc-topnav {
        padding: 12px 16px;
    }
    .fsc-topnav-title {
        font-size: 12px;
        max-width: 180px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }
    .fsc-hero-title {
        font-size: 30px;
    }
    .fsc-hero-en {
        font-size: 22px;
    }
}