@import url('https://fonts.googleapis.com/css2?family=SF+Pro+Display:wght@400;500;600;700&display=swap');

:root {
    --apple-bg: #f5f5f7;
    --apple-card: #ffffff;
    --apple-text: #1d1d1f;
    --apple-gray: #86868b;
    --apple-blue: #0071e3;
    --apple-green: #34c759;
    --apple-red: #ff3b30;
    --apple-orange: #ff9500;
    --apple-purple: #af52de;
    --apple-pink: #ff2d55;
    --apple-shadow: 0 10px 30px rgba(0,0,0,0.08);
    --apple-shadow-lg: 0 20px 50px rgba(0,0,0,0.15);
    --apple-radius: 18px;
    --apple-radius-sm: 12px;
    --apple-transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--apple-bg);
    color: var(--apple-text);
    line-height: 1.6;
}

/* 标题 */
.title-A { font-size: 3rem; font-weight: 700; letter-spacing: -0.03em; }
.title-B { font-size: 2.2rem; font-weight: 600; letter-spacing: -0.02em; }
.title-C { font-size: 1.6rem; font-weight: 600; letter-spacing: -0.01em; }
.title-D { font-size: 1.1rem; font-weight: 500; color: var(--apple-gray); }

/* 按钮 */
.btn-A, .btn-A-green, .btn-A-red, .btn-A-purple, .btn-A-pink {
    padding: 14px 32px; font-size: 1.1rem; font-weight: 600; border-radius: 9999px;
    color: white; border: none; cursor: pointer; box-shadow: var(--apple-shadow);
}
.btn-A { background: var(--apple-blue); }
.btn-A-green { background: var(--apple-green); }
.btn-A-red { background: var(--apple-red); }
.btn-A-purple { background: var(--apple-purple); }
.btn-A-pink { background: var(--apple-pink); }
.btn-A:hover { transform: translateY(-3px); }

.btn-B { padding:12px 28px; font-size:1rem; font-weight:500; border-radius:14px; background:white; color:var(--apple-text); border:1.5px solid #d2d2d7; }
.btn-B:hover { border-color:var(--apple-blue); color:var(--apple-blue); }

.btn-C { padding:16px 36px; font-size:1.05rem; font-weight:600; border-radius:9999px; background:linear-gradient(135deg,var(--apple-purple),var(--apple-blue)); color:white; }
.btn-C:hover { transform:scale(1.06); }

.btn-D { padding:10px 24px; font-size:0.95rem; font-weight:500; border-radius:9999px; background:transparent; color:var(--apple-blue); border:2px solid var(--apple-blue); }
.btn-D:hover { background:var(--apple-blue); color:white; }

/* 卡片 */
.card-A, .card-B, .card-C, .card-D {
    background: var(--apple-card); border-radius: var(--apple-radius);
    padding: 32px; box-shadow: var(--apple-shadow);
}
.card-A:hover { transform: translateY(-12px); box-shadow: var(--apple-shadow-lg); }
.card-B { background: rgba(255,255,255,0.85); backdrop-filter: blur(30px); border:1px solid rgba(0,0,0,0.06); }

/* 导航 */
.nav-A {
    display: flex; background: rgba(255,255,255,0.92); backdrop-filter: blur(40px);
    padding: 8px; border-radius: 9999px; box-shadow: var(--apple-shadow); width: fit-content;
}
.nav-item-A {
    padding: 10px 28px; border-radius: 9999px; font-weight: 500; cursor: pointer; transition: var(--apple-transition);
}
.nav-item-A.active { background: var(--apple-blue); color: white; }

/* 徽章 */
.badge-A { padding: 6px 16px; font-size: 0.85rem; font-weight: 600; border-radius: 9999px; background: var(--apple-blue); color: white; display: inline-block; }
.badge-B { padding: 5px 14px; background: #f5f5f7; color: var(--apple-gray); border: 1px solid #e5e5e7; border-radius: 9999px; display: inline-block; }

/* 提示框 */
.alert-A { padding: 20px; border-radius: 16px; background: #fff0f0; border-left: 6px solid var(--apple-red); color: #c42b1c; }
.alert-B { padding: 20px; border-radius: 16px; background: #e8f5e8; border-left: 6px solid var(--apple-green); color: #1e7e34; }

/* 其他 */
.progress-A { height: 6px; background: #e5e5e7; border-radius: 9999px; overflow: hidden; }
.progress-bar { height: 100%; background: var(--apple-blue); width: 65%; border-radius: 9999px; }