:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --success: #10b981;
    --danger: #ef4444;
    --gray: #6b7280;
    --light-gray: #f3f4f6;
    --border: #e5e7eb;
    --text: #1f2937;
    --bg: #f8fafc;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.nav {
    background: white;
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
    position: sticky;
    top: 0;
    z-index: 10;
}

.nav-brand {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
    text-decoration: none;
}

.nav-links a {
    color: var(--gray);
    text-decoration: none;
    margin-left: 20px;
    padding: 6px 10px;
    border-radius: 8px;
    font-size: 0.95rem;
}

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

.container { max-width: 760px; width: 100%; margin: 32px auto; padding: 0 16px; flex: 1; }

.card {
    background: white;
    border-radius: 14px;
    border: 1px solid var(--border);
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 18px;
}

.card-title { font-weight: 700; font-size: 1.05rem; }

/* 上传区 */
.drop-zone {
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 44px 20px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
}

.drop-zone:hover, .drop-zone.drag { border-color: var(--primary); background: #eef2ff; }
.drop-zone.compact { padding: 16px; }
.drop-icon { font-size: 2.4rem; margin-bottom: 8px; }
.drop-zone.compact .drop-icon { display: none; }
.drop-text { font-size: 1rem; font-weight: 600; }
.drop-hint { font-size: 0.85rem; color: var(--gray); margin-top: 6px; }
.drop-zone.compact .drop-text, .drop-zone.compact .drop-hint { display: none; }

.file-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
    background: var(--light-gray);
    border-radius: 10px;
    margin-top: 12px;
}

.file-name { font-weight: 600; flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-size { color: var(--gray); font-size: 0.9rem; }

/* 选项 */
.options { display: flex; gap: 16px; margin-top: 18px; flex-wrap: wrap; }
.option-item { flex: 1; min-width: 160px; }
.option-item label { display: block; font-size: 0.85rem; color: var(--gray); margin-bottom: 6px; font-weight: 600; }
.option-item select, .option-item input[type="number"] {
    width: 100%;
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
}
.option-hint { display: block; font-size: 0.75rem; color: var(--gray); margin-top: 4px; }

/* 开关 */
.switch { position: relative; display: inline-block; width: 44px; height: 24px; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider {
    position: absolute; inset: 0;
    background: #d1d5db;
    border-radius: 24px;
    cursor: pointer;
    transition: 0.2s;
}
.slider::before {
    content: "";
    position: absolute;
    height: 18px; width: 18px;
    left: 3px; top: 3px;
    background: white;
    border-radius: 50%;
    transition: 0.2s;
}
.switch input:checked + .slider { background: var(--primary); }
.switch input:checked + .slider::before { transform: translateX(20px); }

/* 按钮 */
.btn {
    border: 1px solid var(--border);
    background: white;
    color: var(--text);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.95rem;
    transition: 0.15s;
}
.btn:hover { background: var(--light-gray); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: white; font-weight: 600; }
.btn-primary:hover:not(:disabled) { background: var(--primary-dark); }
.btn-primary:disabled { background: #c7d2fe; border-color: #c7d2fe; }
.btn-danger { color: var(--danger); border-color: #fecaca; }
.btn-danger:hover { background: #fef2f2; }
.btn-block { width: 100%; margin-top: 18px; padding: 12px; font-size: 1rem; }
.btn-text { border: none; background: none; color: var(--primary); padding: 4px 8px; }
.btn-copy { padding: 4px 10px; font-size: 0.85rem; }
.btn-xs { padding: 3px 8px; font-size: 0.8rem; }

/* 进度条 */
.progress-wrap { margin-top: 16px; }
.progress-bar { height: 10px; background: var(--light-gray); border-radius: 8px; overflow: hidden; }
.progress-fill { height: 100%; width: 0; background: var(--primary); transition: width 0.2s; border-radius: 8px; }
.progress-text { font-size: 0.85rem; color: var(--gray); margin-top: 6px; text-align: center; }

/* 结果卡片 */
.result-card { border-color: #a7f3d0; background: #f0fdf9; }
.result-row { display: flex; align-items: center; gap: 12px; margin: 10px 0; flex-wrap: wrap; }
.result-label { font-size: 0.9rem; color: var(--gray); min-width: 70px; font-weight: 600; }
.link-box {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 8px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px 10px;
    min-width: 260px;
}
.link-box code { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; word-break: break-all; }
.result-meta { font-size: 0.85rem; color: var(--gray); margin-top: 8px; }
.result-actions { display: flex; gap: 10px; margin-top: 14px; }

/* 下载页 */
.download-card { max-width: 520px; margin: 60px auto; text-align: center; }
.file-preview {
    display: flex;
    align-items: center;
    gap: 14px;
    background: var(--light-gray);
    border-radius: 12px;
    padding: 18px;
    margin-bottom: 18px;
    text-align: left;
}
.file-icon { font-size: 2.2rem; }
.dl-filename { font-weight: 700; word-break: break-all; }
.dl-meta { font-size: 0.85rem; color: var(--gray); margin-top: 4px; }
.extract-row { margin: 14px 0; }
.extract-row label { display: block; font-size: 0.9rem; color: var(--gray); margin-bottom: 6px; font-weight: 600; }
.extract-row input {
    width: 140px;
    padding: 10px;
    font-size: 1.3rem;
    text-align: center;
    letter-spacing: 6px;
    border: 1px solid var(--border);
    border-radius: 8px;
}
.dl-hint { font-size: 0.8rem; color: var(--gray); margin-top: 14px; }

.alert { padding: 10px 14px; border-radius: 8px; margin: 12px 0; font-size: 0.9rem; }
.alert-error { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; }

/* 失效页 */
.invalid-card { max-width: 420px; margin: 100px auto; text-align: center; }
.invalid-icon { font-size: 3rem; }
.invalid-title { font-size: 1.2rem; font-weight: 700; margin: 12px 0 6px; }
.invalid-reason { color: var(--gray); margin-bottom: 18px; }

/* 表格 */
.table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.table th {
    text-align: left;
    color: var(--gray);
    font-weight: 600;
    padding: 8px 10px;
    border-bottom: 2px solid var(--border);
    font-size: 0.8rem;
}
.table td { padding: 10px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.name-cell { max-width: 180px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 600; }
.link-cell { max-width: 240px; }
.link-cell code { display: block; font-size: 0.8rem; color: var(--primary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; margin-bottom: 3px; }
.action-cell { white-space: nowrap; }

.badge { padding: 3px 10px; border-radius: 12px; font-size: 0.78rem; font-weight: 600; }
.badge-success { background: #d1fae5; color: #059669; }
.badge-gray { background: var(--light-gray); color: var(--gray); }
.badge-danger { background: #fef2f2; color: var(--danger); }
.badge-info { background: #e0f2fe; color: #0284c7; }

.empty-state { text-align: center; padding: 40px; color: var(--gray); }
.empty-state a { color: var(--primary); }

/* 设置表单 */
.form-row label { display: block; font-size: 0.85rem; color: var(--gray); margin-bottom: 6px; font-weight: 600; }
.form-row input[type="text"] {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
}
.form-hint { font-size: 0.8rem; color: var(--gray); margin-top: 8px; line-height: 1.6; }
.save-msg { margin-left: 12px; font-size: 0.9rem; }
.save-msg.ok { color: var(--success); }
.save-msg.error { color: var(--danger); }

.footer { text-align: center; padding: 24px; color: var(--gray); font-size: 0.8rem; }

/* 导航用户区 */
.nav-right { display: flex; align-items: center; gap: 8px; }
.nav-user { font-size: 0.9rem; color: var(--gray); margin-left: 8px; }

/* 登录页 */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #eef2ff 0%, #f8fafc 100%);
}
.login-card {
    background: white;
    border-radius: 16px;
    border: 1px solid var(--border);
    box-shadow: 0 10px 40px rgba(79, 70, 229, 0.08);
    padding: 36px 40px;
    width: 380px;
    max-width: calc(100vw - 32px);
}
.login-brand { font-size: 1.4rem; font-weight: 800; text-align: center; margin-bottom: 6px; }
.login-title { font-size: 1.05rem; font-weight: 700; text-align: center; }
.login-sub { font-size: 0.82rem; color: var(--gray); text-align: center; margin: 6px 0 22px; }
.login-field { margin-bottom: 14px; }
.login-field label { display: block; font-size: 0.85rem; color: var(--gray); margin-bottom: 6px; font-weight: 600; }
.login-field input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
}
.login-field input:focus { outline: 2px solid #c7d2fe; border-color: var(--primary); }
.login-card .btn-block { margin-top: 8px; }
.login-msg { display: block; text-align: center; font-size: 0.88rem; margin-top: 12px; min-height: 1.2em; }
.login-msg.error { color: var(--danger); }

/* 设置页 textarea 与密码网格 */
.form-row textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.9rem;
    font-family: Consolas, monospace;
    resize: vertical;
}
.pw-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.pw-grid input {
    width: 100%;
    padding: 9px 11px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
}
@media (max-width: 640px) { .pw-grid { grid-template-columns: 1fr; } }

/* 双 Tab（文件 / 链接） */
.tab-bar { display: flex; gap: 8px; margin-bottom: 16px; border-bottom: 2px solid var(--border); padding-bottom: 0; }
.tab-btn {
    border: none; background: none; cursor: pointer;
    padding: 8px 18px; font-size: 0.95rem; color: var(--gray);
    border-bottom: 3px solid transparent; margin-bottom: -2px;
    transition: color .15s;
}
.tab-btn:hover { color: var(--primary); }
.tab-btn.active { color: var(--primary); font-weight: 600; border-bottom-color: var(--primary); }