/* 星帆 STARSAIL 公司網站。iOS 的感覺:大圓角、柔影、systemGrouped 底、系統字(守則 §6)。純 CSS,無框架。 */
:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --ink: #1c1c1e;
  --ink-2: #6e6e73;
  --ink-3: #aeaeb2;
  --line: #e5e5ea;
  --navy: #0b1f3a;
  --navy-ink: #ffffff;
  --accent: #0a84ff;
  --accent-soft: #e5f1ff;
  --gold: #f5c451;
  --bad: #ff3b30;
  --bad-soft: #ffe5e3;
  --good: #34c759;
  --good-soft: #e3f8e8;
  --radius: 16px;
  --radius-sm: 12px;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 10px 30px rgba(11, 31, 58, 0.08);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro TC", "PingFang TC", "Helvetica Neue", "Noto Sans TC", system-ui, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --card: #1c1c1e;
    --ink: #f2f2f7;
    --ink-2: #98989d;
    --ink-3: #636366;
    --line: #2c2c2e;
    --navy: #0f2a4a;
    --accent: #0a84ff;
    --accent-soft: #0f2a4a;
    --bad-soft: #3a1210;
    --good-soft: #0f2e1a;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 30px rgba(0, 0, 0, 0.5);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--font); font-size: 17px; line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-decoration: none; }
h1, h2, h3 { margin: 0; letter-spacing: -0.01em; line-height: 1.2; }
h1 { font-size: clamp(30px, 7.2vw, 52px); font-weight: 700; text-wrap: balance; }
h2 { font-size: clamp(24px, 4vw, 34px); font-weight: 700; margin-bottom: 20px; }
h3 { font-size: 19px; font-weight: 650; margin-bottom: 6px; }
p { margin: 0 0 12px; }
.wrap { width: min(1080px, 100% - 32px); margin-inline: auto; }
.wrap.narrow { max-width: 720px; }
.center { text-align: center; padding: 96px 0; }
.eyebrow { color: var(--accent); font-size: 14px; font-weight: 650; letter-spacing: 0.02em; margin-bottom: 10px; }
.lead { color: var(--ink-2); font-size: 18px; max-width: 640px; }
.muted { color: var(--ink-3); font-size: 14px; }
.skip { position: absolute; left: -9999px; top: 8px; background: var(--card); padding: 8px 12px; border-radius: 8px; }
.skip:focus { left: 8px; z-index: 10; }

/* 頂欄 */
.top { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--bg) 82%, transparent); backdrop-filter: saturate(180%) blur(14px); -webkit-backdrop-filter: saturate(180%) blur(14px); border-bottom: 1px solid var(--line); }
.bar { display: flex; align-items: center; justify-content: space-between; min-height: 60px; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); }
.brand .mark { width: 30px; height: 30px; border-radius: 8px; }
.brand-zh { font-weight: 700; font-size: 19px; }
.brand-en { font-size: 12px; letter-spacing: 0.14em; color: var(--ink-2); margin-top: 3px; }
.brand.small .brand-zh { font-size: 17px; }
.nav { display: flex; align-items: center; gap: 18px; font-size: 15px; }
.nav a { color: var(--ink-2); font-weight: 500; }
.nav a:hover { color: var(--ink); }
.nav .nav-cta { color: var(--navy-ink); background: var(--navy); padding: 8px 14px; border-radius: 999px; }
@media (max-width: 640px) { .nav a:not(.nav-cta) { display: none; } }

/* 首屏 */
.hero { padding: 72px 0 56px; }
@media (min-width: 768px) { .hero { padding: 112px 0 80px; } }
.hero h1 { max-width: 760px; }
@media (max-width: 480px) { .hero h1 br { display: none; } }
.hero .lead { margin-top: 18px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 22px; border-radius: var(--radius-sm); background: var(--navy); color: var(--navy-ink); font-weight: 650; font-size: 16px; border: 0; cursor: pointer; }
.btn:hover { filter: brightness(1.08); }
.btn:disabled { opacity: 0.6; cursor: default; }
.btn.ghost { background: var(--card); color: var(--ink); box-shadow: inset 0 0 0 1px var(--line); }
.hero-points { list-style: none; padding: 0; margin: 36px 0 0; display: grid; gap: 10px; color: var(--ink-2); font-size: 15px; }
@media (min-width: 768px) { .hero-points { grid-template-columns: repeat(3, 1fr); gap: 16px; } }
.hero-points li { padding-left: 22px; position: relative; }
.hero-points li::before { content: ""; position: absolute; left: 0; top: 9px; width: 10px; height: 10px; border-radius: 50%; background: var(--gold); }

/* 區塊 */
.section { padding: 64px 0; }
@media (min-width: 768px) { .section { padding: 88px 0; } }
.section.alt { background: color-mix(in srgb, var(--card) 55%, var(--bg)); }
.grid3 { display: grid; gap: 16px; }
@media (min-width: 768px) { .grid3 { grid-template-columns: repeat(3, 1fr); gap: 20px; } }
.card { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; }
.card p { color: var(--ink-2); font-size: 16px; }
.card .fit { color: var(--ink); font-size: 15px; margin-top: 10px; padding-top: 12px; border-top: 1px solid var(--line); }
.card.plain { box-shadow: none; border: 1px solid var(--line); }
.icon { width: 44px; height: 44px; border-radius: 12px; background: var(--accent-soft); display: grid; place-items: center; margin-bottom: 14px; }
.icon svg { width: 24px; height: 24px; fill: none; stroke: var(--accent); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* 步驟 */
.steps { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
@media (min-width: 768px) { .steps { grid-template-columns: repeat(2, 1fr); gap: 18px; } }
.steps li { display: flex; gap: 16px; background: var(--card); border-radius: var(--radius); padding: 20px 22px; box-shadow: var(--shadow); }
.steps .n { flex: 0 0 36px; height: 36px; border-radius: 50%; background: var(--navy); color: var(--navy-ink); display: grid; place-items: center; font-weight: 700; font-variant-numeric: tabular-nums; }
.steps p { color: var(--ink-2); font-size: 16px; margin: 0; }

/* 數字帶 */
.band { background: var(--navy); color: var(--navy-ink); padding: 40px 0; }
.band-grid { display: grid; gap: 20px; text-align: center; }
@media (min-width: 640px) { .band-grid { grid-template-columns: repeat(3, 1fr); } }
.band strong { display: block; font-size: 36px; font-weight: 700; font-variant-numeric: tabular-nums; letter-spacing: -0.01em; }
.band span { color: rgba(255, 255, 255, 0.78); font-size: 15px; }

/* 表單 */
.form { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; margin-top: 24px; display: grid; gap: 14px; }
.row2 { display: grid; gap: 14px; }
@media (min-width: 640px) { .row2 { grid-template-columns: repeat(2, 1fr); } }
.form label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; color: var(--ink-2); font-weight: 500; }
.form input, .form select, .form textarea { font: inherit; font-size: 16px; color: var(--ink); background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius-sm); min-height: 48px; padding: 10px 12px; outline: none; }
.form textarea { min-height: 120px; resize: vertical; }
.form input:focus, .form select:focus, .form textarea:focus { border-color: var(--accent); }
.req { color: var(--bad); }
.hint { color: var(--ink-3); font-size: 13px; margin: -6px 0 0; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-foot { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-top: 4px; }
.status { margin: 0; font-size: 15px; min-height: 1.4em; }
.status.ok { color: var(--good); }
.status.bad { color: var(--bad); }

/* 頁尾 */
.foot { border-top: 1px solid var(--line); padding: 36px 0 calc(36px + env(safe-area-inset-bottom)); }
.foot-grid { display: grid; gap: 6px; font-size: 15px; color: var(--ink-2); }
.foot p { margin: 0; }