/* tool.chemdb.top 全局样式 */
:root {
    --primary: #C00000;
    --primary-light: #e63946;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-600: #6c757d;
    --gray-800: #343a40;
    --shadow: 0 2px 12px rgba(0,0,0,0.08);
    --radius: 10px;
}

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

body {
    font-family: 'Microsoft YaHei UI', 'PingFang SC', sans-serif;
    background: #f5f6fa;
    color: var(--gray-800);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ── 导航栏 ── */
header {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    padding: 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    font-size: 1.2rem;
    font-weight: 700;
}

.logo .divider { color: rgba(255,255,255,0.3); }

.nav-links {
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-links a {
    color: rgba(255,255,255,0.85);
    text-decoration: none;
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 0.9rem;
    transition: background 0.2s;
}

.nav-links a:hover { background: rgba(255,255,255,0.15); color: #fff; }

.nav-links .btn-back {
    background: rgba(192,0,0,0.7);
    color: #fff;
    margin-left: 8px;
}
.nav-links .btn-back:hover { background: var(--primary); }

/* ── 容器 ── */
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

.main-content { flex: 1; padding: 40px 20px; }

/* ── 工具卡片网格 ── */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 20px;
    max-width: 860px;
    margin-left: auto;
    margin-right: auto;
}

@media (max-width: 600px) {
    .tools-grid {
        grid-template-columns: 1fr;
    }
}

.tool-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 32px 24px;
    text-decoration: none;
    color: var(--gray-800);
    box-shadow: var(--shadow);
    border: 2px solid transparent;
    transition: all 0.25s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 10px;
}

.tool-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(192,0,0,0.15);
}

.tool-icon {
    font-size: 2.8rem;
    color: var(--primary);
    margin-bottom: 6px;
}

.tool-card h3 { font-size: 1.15rem; font-weight: 700; }
.tool-card p  { font-size: 0.88rem; color: var(--gray-600); line-height: 1.6; }

.tool-tag {
    display: inline-block;
    background: #fff0f0;
    color: var(--primary);
    border: 1px solid #fcc;
    border-radius: 20px;
    padding: 2px 12px;
    font-size: 0.78rem;
    font-weight: 600;
    margin-top: 6px;
}

/* ── 页脚 ── */
footer {
    background: var(--gray-800);
    color: rgba(255,255,255,0.6);
    text-align: center;
    padding: 20px 0;
    font-size: 0.85rem;
}
footer a { color: rgba(255,255,255,0.8); text-decoration: none; }
footer a:hover { color: #fff; }

/* ── Toast 提示 ── */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: #333;
    color: #fff;
    padding: 10px 24px;
    border-radius: 24px;
    font-size: 0.9rem;
    opacity: 0;
    transition: all 0.3s;
    pointer-events: none;
    z-index: 9999;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }