:root {
    --bg: #f5f7fb;
    --surface: #ffffff;
    --border: #e6e9f0;
    --text: #1a1f36;
    --text-2: #6b7280;
    --primary: #4f46e5;
    --primary-2: #6366f1;
    --primary-soft: #eef2ff;
    --success: #16a34a;
    --danger: #dc2626;
    --warning: #d97706;
    --radius: 14px;
    --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 4px 16px rgba(16, 24, 40, .06);
    --shadow-lg: 0 8px 30px rgba(16, 24, 40, .12);
    --topbar-h: 60px;
    --sidebar-w: 220px;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    font-size: 15px;
    line-height: 1.6;
}

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

/* ---------------- 顶栏 ---------------- */
.topbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--topbar-h);
    background: rgba(255, 255, 255, .9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
}
.topbar-inner {
    max-width: 1280px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 0 20px;
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 18px; color: var(--text); }
.brand-logo {
    width: 30px; height: 30px;
    display: inline-flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, var(--primary), #8b5cf6);
    color: #fff; border-radius: 8px;
}
.topnav { display: flex; gap: 4px; }
.topnav a {
    padding: 6px 14px;
    border-radius: 8px;
    color: var(--text-2);
    font-size: 14px;
}
.topnav a:hover, .topnav a.active { background: var(--primary-soft); color: var(--primary); }
.topbar-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }

/* ---------------- 布局 ---------------- */
.layout {
    display: flex;
    padding-top: var(--topbar-h);
    max-width: 1280px;
    margin: 0 auto;
    min-height: 100vh;
}
.sidebar {
    width: var(--sidebar-w);
    flex-shrink: 0;
    padding: 20px 12px;
    position: sticky;
    top: var(--topbar-h);
    height: calc(100vh - var(--topbar-h));
    overflow-y: auto;
}
.sidebar-group { margin-bottom: 18px; }
.sidebar-title {
    font-size: 12px; font-weight: 600;
    text-transform: uppercase; letter-spacing: .5px;
    color: var(--text-2); padding: 0 10px; margin-bottom: 6px;
}
.sidebar a {
    display: block;
    padding: 8px 12px;
    border-radius: 8px;
    color: var(--text);
    font-size: 14px;
    margin-bottom: 2px;
}
.sidebar a:hover { background: var(--primary-soft); color: var(--primary); }
.sidebar a.active { background: var(--primary-soft); color: var(--primary); font-weight: 600; }
.sidebar a .dot { color: var(--primary); margin-right: 8px; }

.content { flex: 1; padding: 24px 28px 60px; min-width: 0; }

/* ---------------- 通用组件 ---------------- */
.page-title { font-size: 24px; font-weight: 700; margin: 0 0 4px; }
.page-desc { color: var(--text-2); margin: 0 0 20px; }

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}
.card + .card { margin-top: 16px; }

.grid { display: grid; gap: 16px; }
.grid-cards { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.grid-2 { grid-template-columns: 1fr 1fr; }

.tool-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: transform .15s, box-shadow .15s, border-color .15s;
    display: block;
    color: var(--text);
}
.tool-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); border-color: var(--primary-2); }
.tool-card .icon {
    width: 42px; height: 42px; border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 20px; margin-bottom: 12px;
    background: var(--primary-soft); color: var(--primary);
}
.tool-card h3 { margin: 0 0 6px; font-size: 16px; }
.tool-card p { margin: 0; color: var(--text-2); font-size: 13px; }
.tool-card .tag {
    display: inline-block; margin-top: 10px;
    font-size: 11px; padding: 2px 8px; border-radius: 20px;
    background: #f3f4f6; color: var(--text-2);
}
.tool-card .tag.need-key { background: #fef3c7; color: #92400e; }

.btn {
    display: inline-flex; align-items: center; justify-content: center;
    gap: 6px; padding: 9px 18px; border-radius: 9px;
    border: 1px solid transparent; font-size: 14px; font-weight: 500;
    cursor: pointer; transition: all .15s; background: #f3f4f6; color: var(--text);
}
.btn:hover { filter: brightness(.97); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-2); }
.btn-outline { background: transparent; border-color: var(--border); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-block { width: 100%; }

input, textarea, select {
    width: 100%; padding: 10px 12px;
    border: 1px solid var(--border); border-radius: 9px;
    font-size: 14px; font-family: inherit; color: var(--text);
    background: #fff; transition: border-color .15s, box-shadow .15s;
}
input:focus, textarea:focus, select:focus {
    outline: none; border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-soft);
}
textarea { resize: vertical; min-height: 100px; }
label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: var(--text); }
.field { margin-bottom: 16px; }
.row { display: flex; gap: 12px; align-items: center; }
.row > * { flex: 1; }

.form-title { font-size: 20px; font-weight: 700; margin: 0 0 4px; }
.form-sub { color: var(--text-2); margin: 0 0 20px; font-size: 14px; }
.form-card { max-width: 420px; margin: 40px auto; }

/* 消息/输出区 */
.output-box {
    background: #0f172a; color: #e2e8f0;
    border-radius: 10px; padding: 14px 16px;
    font-size: 13.5px; white-space: pre-wrap; word-break: break-word;
    min-height: 60px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.chat-box {
    border: 1px solid var(--border); border-radius: var(--radius);
    background: var(--surface); display: flex; flex-direction: column;
    height: 520px; overflow: hidden;
}
.chat-messages { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 12px; }
.msg { max-width: 82%; padding: 10px 14px; border-radius: 12px; font-size: 14px; white-space: pre-wrap; word-break: break-word; }
.msg.user { align-self: flex-end; background: var(--primary); color: #fff; border-bottom-right-radius: 4px; }
.msg.ai { align-self: flex-start; background: #f3f4f6; color: var(--text); border-bottom-left-radius: 4px; }
.msg.error { align-self: flex-start; background: #fef2f2; color: var(--danger); }
.chat-input { border-top: 1px solid var(--border); padding: 12px; display: flex; gap: 10px; }
.chat-input textarea { min-height: 44px; max-height: 120px; flex: 1; }

/* 表格 */
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); }
th { color: var(--text-2); font-weight: 600; font-size: 13px; }

/* Toast */
.toast {
    position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(20px);
    background: #111827; color: #fff; padding: 10px 20px; border-radius: 10px;
    font-size: 14px; opacity: 0; pointer-events: none; transition: all .25s; z-index: 300;
    box-shadow: var(--shadow-lg);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.err { background: var(--danger); }
.toast.ok { background: var(--success); }

/* 徽章 */
.badge {
    display: inline-block; padding: 2px 10px; border-radius: 20px;
    font-size: 12px; background: var(--primary-soft); color: var(--primary);
}
.badge.warn { background: #fef3c7; color: #92400e; }

/* 分割线 */
.divider { height: 1px; background: var(--border); margin: 20px 0; }

/* 响应式 */
@media (max-width: 900px) {
    .layout { flex-direction: column; }
    .sidebar {
        width: 100%; height: auto; position: static;
        display: block; padding: 10px 16px;
        border-bottom: 1px solid var(--border);
    }
    .sidebar-group { display: block; margin: 0 0 6px; }
    .sidebar-title { display: block; }
    .sidebar a { white-space: normal; display: inline-block; margin: 2px 6px 2px 0; padding: 4px 10px; }
    .content { padding: 16px; }
    .grid-2 { grid-template-columns: 1fr; }
    .topnav { display: none; }
    .row { flex-direction: column; }
}

/* ---------------- 首页 Hero ---------------- */
.hero {
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #8b5cf6 100%);
    color: #fff;
    border-radius: var(--radius);
    padding: 48px 32px;
    text-align: center;
    margin-bottom: 28px;
}
.hero-title { font-size: 34px; font-weight: 800; margin: 0 0 12px; letter-spacing: -.5px; }
.hero-sub { font-size: 16px; opacity: .92; margin: 0 auto 24px; max-width: 640px; line-height: 1.7; }
.hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero .btn-outline { background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.4); color: #fff; }
.hero .btn-outline:hover { background: rgba(255,255,255,.2); color: #fff; border-color: #fff; }
.hero-foot { margin-top: 32px; background: linear-gradient(135deg, #0f172a, #1e293b); }
.btn-lg { font-size: 15px; padding: 11px 26px; }
.section-title { font-size: 20px; font-weight: 700; margin: 28px 0 14px; }
.section-title span { color: var(--text-2); font-size: 14px; font-weight: 400; }
@media (max-width: 900px) {
    .hero { padding: 32px 20px; }
    .hero-title { font-size: 26px; }
}

/* ---------------- 网站底部 ---------------- */
.site-footer {
    border-top: 1px solid var(--border);
    background: var(--surface);
    padding: 20px 24px;
    text-align: center;
    color: var(--text-2);
    font-size: 13px;
    line-height: 1.8;
}
.site-footer a { color: var(--text-2); text-decoration: underline; }