:root {
    --bg: #f2f8fc;
    --panel: #ffffff;
    --line: rgba(0,40,80,.10);
    --txt: #1f2d3d;
    --muted: #6b7c8f;
    /* Mediterranean blue */
    --blue: #1e88e5;
    --teal: #26c6da;
    --blue-soft: #e3f2fd;
    --radius: 16px;
    --page-max: 640px; /* ✅ .page max-width랑 반드시 동일 */
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: linear-gradient(180deg, #eef7fd 0%, var(--bg) 40%);
    color: var(--txt);
    font-family: system-ui, -apple-system, Segoe UI, Roboto, "Noto Sans KR", sans-serif;
}

/* 가운데 정렬(PC 640px), 모바일 100% */
.stage {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 16px;
}

.page {
    width: 100%;
    max-width: 640px;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 12px 30px rgba(30,136,229,.12);
    position: relative; /* 기준점 */

    max-width: var(--page-max);
}

/* ✅ 스크롤 내려도 고정되는 상단 */
header {
    position: sticky;
    top: 0;
    z-index: 9999;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid rgba(0,0,0,.08);
    padding: 10px 14px 12px;
}

main {
    padding: 14px;
    display: grid;
    gap: 12px;
}

/* ===== Hero ===== */
.hero {
    padding: 14px;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: radial-gradient(500px 260px at 80% 0%, rgba(38,198,218,.18), transparent 60%), radial-gradient(500px 260px at 20% 0%, rgba(30,136,229,.18), transparent 60%), #ffffff;
    text-align: center;
}

.kicker {
    font-size: 12px;
    font-weight: 800;
    color: var(--blue);
}

h1 {
    margin: 8px 0;
    font-size: 20px;
    line-height: 1.3;
}

.sub {
    margin: 0;
    font-size: 13px;
    color: var(--muted);
    line-height: 1.55;
}


.grid2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.card {
    background: #ffffff;
    border-radius: 14px;
    border: 1px solid var(--line);
    padding: 12px;
}

    .card b {
        font-size: 13px;
        color: var(--blue);
    }

    .card p {
        margin: 6px 0 0;
        font-size: 12px;
        color: var(--muted);
    }

/* Mobile */
@media (max-width: 420px) {
    .stage {
        padding: 0;
    }

    .page {
        border-radius: 0;
        border-left: 0;
        border-right: 0;
    }
}