/* ═══════════════════════════════════════
   TieGaier Lab — 极简终端风
   参考 yixuanhe.com 设计语言
   ═══════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

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

:root {
    --bg: #fafafa;
    --surface: #ffffff;
    --text: #1a1a1a;
    --text-2: #555;
    --text-3: #999;
    --text-4: #ccc;
    --border: #e8e8e8;
    --accent: #1a1a1a;
    --green: #22c55e;
    --green-bg: rgba(34, 197, 94, 0.08);
    --radius: 10px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --mono: 'JetBrains Mono', 'Menlo', monospace;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* ── 布局 ── */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 40px;
}

/* ── 导航 ── */
.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
    font-family: var(--mono);
}
.nav-brand {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 2.5px;
    text-transform: uppercase;
    color: var(--text-3);
}
.nav-right {
    display: flex;
    align-items: center;
    gap: 24px;
    font-size: 11px;
    color: var(--text-3);
    letter-spacing: 0.5px;
}
.nav-dot {
    display: inline-block;
    width: 6px; height: 6px;
    background: var(--green);
    border-radius: 50%;
    margin-right: 6px;
    box-shadow: 0 0 6px rgba(34, 197, 94, 0.4);
    animation: pulse 2.5s ease-in-out infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}
.nav-link {
    font-family: var(--mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--text-3);
    cursor: pointer;
    transition: color 0.2s;
    border: 1px solid var(--border);
    padding: 6px 14px;
    border-radius: 6px;
}
.nav-link:hover { color: var(--text); border-color: var(--text); }

/* ── 登录页 ── */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
.login-box { width: 380px; }
.login-greeting {
    font-family: var(--mono);
    font-size: 13px;
    color: var(--green);
    margin-bottom: 14px;
}
.cursor {
    display: inline-block;
    width: 2px; height: 16px;
    background: var(--green);
    margin-left: 3px;
    vertical-align: text-bottom;
    animation: blink 1s step-end infinite;
}
@keyframes blink { 0%, 50% { opacity: 1; } 51%, 100% { opacity: 0; } }

.login-title {
    font-size: 42px;
    font-weight: 900;
    letter-spacing: -2px;
    line-height: 1.1;
    margin-bottom: 8px;
}
.login-sub {
    font-size: 14px;
    color: var(--text-3);
    margin-bottom: 40px;
}

.input-group { margin-bottom: 12px; }
.input-group input {
    width: 100%;
    padding: 13px 16px;
    background: var(--surface);
    border: 1.5px solid var(--border);
    border-radius: 8px;
    font-family: var(--mono);
    font-size: 14px;
    color: var(--text);
    outline: none;
    transition: border-color 0.2s;
}
.input-group input::placeholder { color: var(--text-4); }
.input-group input:focus { border-color: var(--accent); }

.btn-primary {
    width: 100%;
    padding: 14px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-family: var(--mono);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.2s;
    margin-top: 8px;
}
.btn-primary:hover { background: #333; transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }

.login-footer {
    text-align: center;
    margin-top: 40px;
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text-4);
    letter-spacing: 2px;
    text-transform: uppercase;
}

.login-error {
    color: #ef4444;
    font-size: 13px;
    text-align: center;
    margin-top: 12px;
    opacity: 0;
    transition: opacity 0.3s;
}
.login-error.show { opacity: 1; }

/* ── Hero ── */
.hero {
    padding: 60px 0 30px;
}
.hero-greeting {
    font-family: var(--mono);
    font-size: 14px;
    color: var(--green);
    margin-bottom: 18px;
}
.hero-title {
    font-size: 52px;
    font-weight: 900;
    letter-spacing: -2.5px;
    line-height: 1.05;
    margin-bottom: 18px;
}
.hero-desc {
    font-size: 17px;
    color: var(--text-2);
    line-height: 1.7;
    max-width: 560px;
    font-weight: 400;
}

/* ── 终端块 ── */
.terminal {
    font-family: var(--mono);
    font-size: 12px;
    color: var(--text-3);
    padding: 16px 0;
    margin: 16px 0 28px;
    border-top: 1px solid var(--border);
    line-height: 2.2;
}
.terminal .cmd { color: var(--text-3); }
.terminal .val { color: var(--text); font-weight: 600; }
.terminal .ok { color: var(--green); }

/* ── 工具卡片 ── */
.card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    grid-auto-rows: 1fr;
}
.card {
    background: var(--surface);
    border: 1.5px solid var(--border);
    border-radius: 14px;
    padding: 22px 28px 24px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: default;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}
.card:hover {
    border-color: var(--accent);
    transform: translateY(-6px);
    box-shadow: 0 16px 48px rgba(0,0,0,0.06);
}
.card-active { cursor: pointer; }
.card-active:hover .card-emoji {
    transform: scale(1.15);
}

.card-emoji, .card-icon {
    font-size: 32px;
    margin-bottom: 10px;
    display: block;
    transition: transform 0.3s ease;
}
.card-icon svg {
    transition: transform 0.3s ease;
}
.card-active:hover .card-icon svg {
    transform: scale(1.15);
}
.card-title {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.3px;
}
.card-desc {
    font-size: 13px;
    color: var(--text-2);
    line-height: 1.7;
}
.card-tag {
    position: absolute;
    top: 16px;
    right: 16px;
    font-family: var(--mono);
    font-size: 10px;
    font-weight: 600;
    color: var(--green);
    background: var(--green-bg);
    padding: 4px 12px;
    border-radius: 5px;
    letter-spacing: 1px;
    text-transform: uppercase;
}
.card-btn {
    display: block;
    width: 100%;
    padding: 12px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-family: var(--mono);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    cursor: pointer;
    margin-top: 16px;
    transition: all 0.2s;
    text-align: center;
}
.card-btn:hover { background: #333; }

/* 灰卡 */
.card-dim {
    opacity: 0.35;
    pointer-events: none;
}

/* ── Footer ── */
.footer {
    text-align: center;
    padding: 40px 0 30px;
    margin-top: 80px;
    border-top: 1px solid var(--border);
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text-4);
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

/* ── 响应式 ── */
@media (max-width: 768px) {
    .container { padding: 0 20px; }
    .hero-title { font-size: 36px; }
    .card-grid { grid-template-columns: 1fr; }
    .login-title { font-size: 32px; }
    .login-box { width: 100%; padding: 0 20px; }
}

/* ── 加载动画 ── */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.6s ease forwards;
}
.fade-in-delay-1 { animation-delay: 0.1s; }
.fade-in-delay-2 { animation-delay: 0.2s; }
.fade-in-delay-3 { animation-delay: 0.3s; }
.fade-in-delay-4 { animation-delay: 0.4s; }
@keyframes fadeIn {
    to { opacity: 1; transform: translateY(0); }
}