:root {
    --brand-color: #275354;
    --brand-color-hover: #1e4142;
    --bg-color: #f5f6f8;
    --surface-color: rgba(255, 255, 255, 0.78);
    --surface-strong: rgba(255, 255, 255, 0.92);
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --border-color: rgba(15, 23, 42, 0.08);
    --shadow-sm: 0 8px 24px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 18px 48px rgba(15, 23, 42, 0.10);
    --radius-sm: 8px;
    --radius-md: 16px;

    --font-family: "SF Pro Display", "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

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

/* 隐藏滚动条但保留滚动功能 (提升移动端极简感) */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: #999;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 按钮通用样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--brand-color);
    color: white;
}

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

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

.btn-outline:hover {
    border-color: var(--brand-color);
    color: var(--brand-color);
}

/* 头部导航 */
.header {
    background: rgba(245, 246, 248, 0.72);
    border-bottom: 1px solid rgba(255, 255, 255, 0.6);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: saturate(180%) blur(18px);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 18px;
    font-weight: 600;
    color: var(--brand-color);
    text-decoration: none;
    letter-spacing: 1px;
}

.brand-logo {
    height: 40px;
    max-width: 100%;
    object-fit: contain;
}

/* 徽章/标签 */
.tag {
    display: inline-flex;
    align-items: center;
    min-height: 24px;
    padding: 0 10px;
    font-size: 12px;
    background-color: rgba(15, 23, 42, 0.05);
    color: var(--text-secondary);
    border-radius: 10px;
    margin-right: 6px;
    margin-bottom: 6px;
}

/* SVG Icon 通用样式 */
.icon {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

.protected-image {
    -webkit-user-drag: none;
    user-select: none;
    -webkit-touch-callout: none;
}