/* ===== 全局重置 & 基础样式 ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #2d7bf5;
    --primary-dark: #1a5bbf;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text: #0b1a2e;
    --text-secondary: #475569;
    --radius: 16px;
    --shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
    --transition: 0.25s ease;
    /* 新增：统一头部高度，移动端会覆盖 */
    --header-h: 80px;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    font-family: futura-pt, Futura PT, sans-serif;
}
body {
    font-family: futura-pt, Futura PT, sans-serif;
}
a {
    text-decoration: none;
    font-family: futura-pt, Futura PT, sans-serif;
}
li {
    list-style: none;
}
.container {
    width: clamp(320px, 90%, 1600px);
    margin: 0 auto;
    padding: 0 clamp(16px, 2vw, 40px);
    box-sizing: border-box;
}
/* ===== 滚动上升效果 ===== */
.wide-card {
    opacity: 0;
    transform: translateY(80px);
    transition: opacity 0.8s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.8s cubic-bezier(0.22, 1, 0.36, 1),
    box-shadow 0.4s ease;
}
.wide-card.visible {
    opacity: 1;
    transform: translateY(0);
}


/* 左右飞入 */
.card {
    transition: box-shadow 0.4s ease;
    /* 初始状态：移出视口 + 透明 */
    opacity: 0;
    transition: transform 0.9s ease;
    will-change: transform, opacity;
}

/* 左色块：初始在左侧外 */
.card-left {
    transform: translateX(-110vw) scale(0.92);
    background: linear-gradient(145deg, #3b82f6, #1d4ed8);
}

/* 右色块：初始在右侧外 */
.card-right {
    transform: translateX(110vw) scale(0.92);
}

/* ===== 色块进入视口后的状态 ===== */
.card.visible {
    opacity: 1;
    transform: translateX(0) scale(1);
}