/* ============================================================
   PassVault — 主样式表
   响应式设计: 桌面(≥768px) + 手机(<768px)
   ============================================================ */

/* ── CSS 变量 ── */
:root {
    --color-bg: #f0f2f5;
    --color-surface: #ffffff;
    --color-primary: #4f46e5;
    --color-primary-hover: #4338ca;
    --color-primary-light: #eef2ff;
    --color-danger: #dc2626;
    --color-danger-hover: #b91c1c;
    --color-success: #16a34a;
    --color-warning: #f59e0b;
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;
    --color-border: #e2e8f0;
    --color-border-hover: #cbd5e1;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --transition: 150ms ease;
}

/* ── 基础重置 ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial,
                 "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

input, select, textarea, button {
    font-family: inherit; font-size: inherit;
}

/* ── 屏幕切换 ── */
.screen { display: none; }
.screen.active { display: flex; }

/* ── 按钮 ── */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    padding: 8px 16px; border: 1px solid transparent; border-radius: var(--radius);
    font-size: 0.875rem; font-weight: 500; cursor: pointer;
    transition: all var(--transition); line-height: 1.5;
    white-space: nowrap; user-select: none;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-hover); }

.btn-danger { background: var(--color-danger); color: #fff; }
.btn-danger:hover { background: var(--color-danger-hover); }

.btn-outline { background: transparent; color: var(--color-text); border-color: var(--color-border); }
.btn-outline:hover { border-color: var(--color-border-hover); background: var(--color-bg); }

.btn-ghost { background: transparent; color: var(--color-text-secondary); border-color: transparent; }
.btn-ghost:hover { color: var(--color-text); background: var(--color-bg); }

.btn-sm { padding: 4px 10px; font-size: 0.8125rem; }
.btn-block { width: 100%; }

/* ── 表单 ── */
.form-group {
    margin-bottom: 16px; position: relative;
}
.form-group label {
    display: block; margin-bottom: 4px; font-size: 0.875rem; font-weight: 500;
    color: var(--color-text);
}
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%; padding: 8px 12px;
    border: 1px solid var(--color-border); border-radius: var(--radius);
    background: var(--color-surface); color: var(--color-text);
    transition: border-color var(--transition);
    outline: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}
.form-group input[type="password"] { padding-right: 40px; }
.form-group textarea { resize: vertical; min-height: 60px; }

.input-with-btn {
    display: flex; gap: 4px; align-items: center;
}
.input-with-btn input { flex: 1; }

.form-hint { font-size: 0.8125rem; color: var(--color-text-secondary); margin-bottom: 12px; }
.form-hint.warning { color: var(--color-warning); font-weight: 500; }
.required { color: var(--color-danger); }

.toggle-pw {
    position: absolute; right: 8px; bottom: 8px;
    background: none; border: none; cursor: pointer; font-size: 1.125rem;
    padding: 2px 4px; opacity: 0.5; transition: opacity var(--transition);
    line-height: 1;
}
.toggle-pw:hover { opacity: 1; }

.error-msg { color: var(--color-danger); font-size: 0.875rem; margin-top: 8px; }
.error-msg.hidden { display: none; }

/* ── 密码强度 ── */
.password-strength { margin-bottom: 16px; }
.strength-bar { height: 4px; background: var(--color-border); border-radius: 2px; overflow: hidden; }
.strength-fill { height: 100%; width: 0; border-radius: 2px; transition: width 0.3s, background 0.3s; }
.strength-text { font-size: 0.75rem; color: var(--color-text-muted); margin-top: 4px; display: block; }

/* ══════════════════════════════════════════
   登录界面
   ══════════════════════════════════════════ */
#auth-screen.active {
    justify-content: center; align-items: center; min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 20px;
}
.auth-container {
    background: var(--color-surface); border-radius: var(--radius-lg);
    padding: 40px; width: 100%; max-width: 400px;
    box-shadow: var(--shadow-lg);
}
.auth-header { text-align: center; margin-bottom: 28px; }
.auth-logo { font-size: 3rem; margin-bottom: 8px; }
.auth-header h1 { font-size: 1.75rem; font-weight: 700; color: var(--color-text); }
.auth-subtitle { font-size: 0.875rem; color: var(--color-text-secondary); margin-top: 4px; }

.auth-form h2 { font-size: 1.25rem; margin-bottom: 16px; text-align: center; }
.auth-form.hidden { display: none; }

.auth-loading { text-align: center; padding: 20px; }
.auth-loading.hidden { display: none; }
.loading-hint { font-size: 0.75rem; color: var(--color-text-muted); margin-top: 8px; }

/* Spinner */
.spinner {
    width: 40px; height: 40px; margin: 0 auto 12px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ══════════════════════════════════════════
   密码库主界面
   ══════════════════════════════════════════ */
#vault-screen.active {
    flex-direction: column; min-height: 100vh;
}

/* ── 顶部栏 ── */
.vault-header {
    display: flex; align-items: center; gap: 16px;
    padding: 10px 20px; background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm); position: sticky; top: 0; z-index: 100;
}
.header-left { display: flex; align-items: center; gap: 8px; }
.header-logo { font-size: 1.5rem; }
.header-title { font-size: 1.125rem; font-weight: 700; color: var(--color-text); }
.header-center { flex: 1; max-width: 480px; }
.header-right { display: flex; align-items: center; gap: 8px; }

.lock-timer {
    font-size: 0.8125rem; font-weight: 600; color: var(--color-text-secondary);
    font-variant-numeric: tabular-nums; min-width: 40px; text-align: center;
}
.lock-timer.warning { color: var(--color-warning); }
.lock-timer.danger { color: var(--color-danger); animation: pulse 1s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.5; } }

/* ── 搜索框 ── */
.search-box {
    display: flex; align-items: center;
    background: var(--color-bg); border: 1px solid var(--color-border);
    border-radius: var(--radius); padding: 0 10px;
    transition: border-color var(--transition);
}
.search-box:focus-within {
    border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}
.search-icon { font-size: 0.875rem; opacity: 0.5; }
.search-box input {
    flex: 1; border: none; background: transparent; padding: 8px 8px;
    outline: none; font-size: 0.875rem;
}
.search-clear {
    background: none; border: none; cursor: pointer; font-size: 0.875rem;
    opacity: 0.4; padding: 2px;
}
.search-clear:hover { opacity: 0.8; }
.search-clear.hidden { display: none; }

/* ── Body 布局 ── */
.vault-body {
    display: flex; flex: 1; overflow: hidden;
}

/* ── 侧边栏 ── */
.vault-sidebar {
    width: 220px; min-width: 220px;
    background: var(--color-surface); border-right: 1px solid var(--color-border);
    padding: 16px; display: flex; flex-direction: column; gap: 16px;
    overflow-y: auto;
}
.sidebar-section { }
.sidebar-nav { display: flex; flex-direction: column; gap: 2px; flex: 1; }
.nav-item {
    display: flex; align-items: center; gap: 8px;
    padding: 8px 12px; border-radius: var(--radius);
    font-size: 0.875rem; color: var(--color-text-secondary);
    text-decoration: none; transition: all var(--transition);
}
.nav-item:hover { background: var(--color-bg); text-decoration: none; }
.nav-item.active { background: var(--color-primary-light); color: var(--color-primary); font-weight: 600; }
.nav-count {
    margin-left: auto; font-size: 0.75rem; background: var(--color-border);
    padding: 1px 6px; border-radius: 10px; color: var(--color-text-secondary);
}
.nav-item.active .nav-count { background: var(--color-primary); color: #fff; }
.sidebar-footer { border-top: 1px solid var(--color-border); padding-top: 12px; }

/* ── 主内容区 ── */
.vault-main {
    flex: 1; overflow-y: auto; padding: 20px;
    background: var(--color-bg);
}

/* ── 空状态 ── */
.empty-state {
    text-align: center; padding: 60px 20px; color: var(--color-text-secondary);
}
.empty-state.hidden { display: none; }
.empty-icon { font-size: 3rem; margin-bottom: 12px; }
.empty-state h3 { font-size: 1.125rem; margin-bottom: 4px; color: var(--color-text); }

/* ── 表格视图 (桌面) ── */
.entries-table-wrapper { overflow-x: auto; }
.entries-table {
    width: 100%; border-collapse: collapse; background: var(--color-surface);
    border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow);
}
.entries-table thead { background: var(--color-bg); }
.entries-table th {
    padding: 12px 16px; text-align: left; font-size: 0.75rem; font-weight: 600;
    color: var(--color-text-secondary); text-transform: uppercase; letter-spacing: 0.05em;
    border-bottom: 1px solid var(--color-border);
}
.entries-table td {
    padding: 12px 16px; font-size: 0.875rem;
    border-bottom: 1px solid var(--color-border);
    vertical-align: middle;
}
.entries-table tbody tr { cursor: pointer; transition: background var(--transition); }
.entries-table tbody tr:hover { background: var(--color-primary-light); }
.entries-table tbody tr:last-child td { border-bottom: none; }

.col-site { width: 25%; }
.col-username { width: 20%; }
.col-password { width: 20%; }
.col-category { width: 15%; }
.col-actions { width: 20%; text-align: right; }

.entry-site-name { font-weight: 600; color: var(--color-text); }
.entry-site-url { font-size: 0.75rem; color: var(--color-text-muted); }
.entry-password-masked { font-family: monospace; letter-spacing: 2px; color: var(--color-text-muted); }
.entry-password-shown { font-family: monospace; }
.category-badge {
    display: inline-block; padding: 2px 8px; border-radius: 12px;
    font-size: 0.75rem; background: var(--color-bg); color: var(--color-text-secondary);
}
.actions-cell { display: flex; gap: 4px; justify-content: flex-end; }
.action-btn {
    background: none; border: 1px solid var(--color-border); border-radius: var(--radius);
    padding: 4px 8px; font-size: 0.8125rem; cursor: pointer;
    transition: all var(--transition); color: var(--color-text-secondary);
}
.action-btn:hover { background: var(--color-bg); border-color: var(--color-border-hover); }
.action-btn.copy-btn { color: var(--color-primary); }
.action-btn.copy-btn:hover { background: var(--color-primary-light); }
.action-btn.copy-btn.copied { color: var(--color-success); border-color: var(--color-success); }

/* ── 卡片视图 (手机) ── */
.entries-cards { display: none; }
.entry-card {
    background: var(--color-surface); border-radius: var(--radius-lg);
    padding: 16px; margin-bottom: 12px; box-shadow: var(--shadow);
    cursor: pointer; transition: box-shadow var(--transition);
}
.entry-card:hover { box-shadow: var(--shadow-lg); }
.entry-card-header { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 8px; }
.entry-card-title { font-weight: 600; font-size: 1rem; }
.entry-card-url { font-size: 0.75rem; color: var(--color-text-muted); }
.entry-card-body { display: flex; flex-direction: column; gap: 4px; }
.entry-card-field { display: flex; justify-content: space-between; font-size: 0.875rem; }
.entry-card-label { color: var(--color-text-secondary); }
.entry-card-actions { display: flex; gap: 8px; margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--color-border); }

/* ── 手机端底部导航 ── */
.mobile-nav { display: none; }
.mobile-nav {
    background: var(--color-surface); border-top: 1px solid var(--color-border);
    padding: 8px 16px; justify-content: space-around; align-items: center;
}
.mobile-nav-item {
    display: flex; flex-direction: column; align-items: center; gap: 2px;
    background: none; border: none; font-size: 0.6875rem; color: var(--color-text-muted);
    cursor: pointer; padding: 4px 8px;
}
.mobile-nav-item.active { color: var(--color-primary); }
.mobile-nav-item .nav-icon { font-size: 1.25rem; }
.add-btn-large {
    display: flex; align-items: center; justify-content: center;
    width: 44px; height: 44px; background: var(--color-primary); color: #fff;
    border-radius: 50%; font-size: 1.25rem;
}

/* ══════════════════════════════════════════
   模态窗
   ══════════════════════════════════════════ */
.modal-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,0.5);
    display: flex; align-items: center; justify-content: center;
    z-index: 200; padding: 20px;
}
.modal-overlay.hidden { display: none; }
.modal {
    background: var(--color-surface); border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg); width: 100%; max-width: 500px;
    max-height: 90vh; overflow-y: auto; padding: 24px;
}
.modal-sm { max-width: 360px; }
.modal-header {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 16px;
}
.modal-header h2 { font-size: 1.25rem; }
.modal-close {
    background: none; border: none; font-size: 1.25rem; cursor: pointer;
    color: var(--color-text-muted); padding: 4px;
}
.modal-close:hover { color: var(--color-text); }
.modal-body-text { margin-bottom: 20px; color: var(--color-text-secondary); line-height: 1.6; }
.modal-actions {
    display: flex; justify-content: flex-end; gap: 8px; margin-top: 20px;
}

/* ══════════════════════════════════════════
   Toast 通知
   ══════════════════════════════════════════ */
.toast-container {
    position: fixed; top: 20px; right: 20px; z-index: 300;
    display: flex; flex-direction: column; gap: 8px;
    max-width: 360px;
}
.toast {
    background: var(--color-text); color: #fff; padding: 12px 16px;
    border-radius: var(--radius); font-size: 0.875rem;
    box-shadow: var(--shadow-lg); animation: slideIn 0.3s ease;
    display: flex; align-items: center; gap: 8px;
}
.toast.success { border-left: 4px solid var(--color-success); }
.toast.error { border-left: 4px solid var(--color-danger); }
.toast.info { border-left: 4px solid var(--color-primary); }
@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
@keyframes slideOut { from { transform: translateX(0); opacity: 1; } to { transform: translateX(100%); opacity: 0; } }
.toast.removing { animation: slideOut 0.3s ease forwards; }

/* ══════════════════════════════════════════
   通用工具类
   ══════════════════════════════════════════ */
.hidden { display: none !important; }

/* ══════════════════════════════════════════
   响应式: 手机端 (< 768px)
   ══════════════════════════════════════════ */
@media (max-width: 767px) {
    .vault-sidebar { display: none; }
    .entries-table-wrapper { display: none; }
    .entries-cards { display: block; }
    .mobile-nav { display: flex; }
    .vault-main { padding: 12px; padding-bottom: 70px; }

    .vault-header { padding: 8px 12px; gap: 8px; }
    .header-title { display: none; }
    .header-center { max-width: none; }
    .header-right { gap: 4px; }

    #btn-manage-categories { display: none; }

    .modal { max-width: 100%; margin: 0 8px; padding: 20px; border-radius: var(--radius-lg) var(--radius-lg) 0 0; }

    .auth-container { padding: 24px; }
}

/* ── 响应式: 小屏优化 (≤ 480px) ── */
@media (max-width: 480px) {
    .entry-card { padding: 12px; }
    .entry-card-actions .btn { padding: 6px 10px; font-size: 0.75rem; }
}