/*
  style.css — InaShare Pro 官方網站的樣式（inashare.hheb.top）。

  設計原則：
  1. **自足**：只用系統字型，不載入任何外部 CDN 或字型檔。
     審核員常在受限網路下開頁面，外部字型會讓頁面閃爍或直接不是預期字體。
  2. **手機優先**：審核員多半用手機看，所有尺寸先以窄螢幕為準，
     再用 min-width 媒體查詢放大。
  3. 顏色對應 iOS App 的 Theme：暖白底（#FAF7F0）、深青品牌色（#0D3B3E）、
     青綠動作色（#0F766E）、薄荷強調（#5EEAD4）、參加者藍（#315EFB）。
  4. 支援系統深色模式（對應 App 的深色主題），不提供手動切換。
*/

/* ══════════ 設計變數 ══════════ */
:root {
  --bg: #FAF7F0;
  --bg-top: #F3EEE6;
  --card: #FFFFFF;
  --text: #0B1C24;
  --muted: #5F6F75;
  --border: #E2D9CC;

  --brand: #0D3B3E;
  --action: #0F766E;
  --accent: #5EEAD4;
  --blue: #315EFB;
  --success: #2E8B6E;
  --danger: #B93F3A;

  --hero-grad: linear-gradient(158deg, #0D3B3E 0%, #0F766E 58%, #315EFB 100%);
  --on-hero: #FFFFFF;
  --on-hero-muted: #D6F6F0;

  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 2px 12px rgba(11, 28, 36, 0.06);
  --shadow-hover: 0 8px 24px rgba(11, 28, 36, 0.10);
  --max-width: 760px;
  --nav-height: 60px;

  --font-stack: -apple-system, BlinkMacSystemFont, "PingFang TC",
                "PingFang HK", "Microsoft JhengHei", "Noto Sans TC",
                "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #081114;
    --bg-top: #0B171A;
    --card: #101C20;
    --text: #F4F1EA;
    --muted: #A7B5B8;
    --border: #294046;

    --brand: #0B2B2E;
    --action: #2DD4BF;
    --accent: #99F6E4;
    --blue: #7AA2FF;
    --success: #5BD6AE;
    --danger: #FF8A7A;

    --hero-grad: linear-gradient(158deg, #0B2B2E 0%, #0E4F4A 58%, #1E3A8A 100%);
    --on-hero: #F4F1EA;
    --on-hero-muted: #B7E9E1;

    --shadow: 0 2px 12px rgba(0, 0, 0, 0.45);
    --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.55);
  }
}

/* ══════════ 基本 ══════════ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  /* 錨點要停在 sticky 導覽列下方，否則標題會被蓋住。 */
  scroll-padding-top: calc(var(--nav-height) + 12px);
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-stack);
  font-size: 17px;
  line-height: 1.75;
}

main {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px 48px;
}

section {
  scroll-margin-top: calc(var(--nav-height) + 12px);
  padding-top: 32px;
}

h1,
h2,
h3 {
  line-height: 1.35;
  margin: 0 0 12px;
}

h2 {
  font-size: 26px;
  color: var(--brand);
}

@media (prefers-color-scheme: dark) {
  h2 {
    color: var(--accent);
  }
}

h3 {
  font-size: 19px;
}

p {
  margin: 0 0 12px;
}

p:last-child {
  margin-bottom: 0;
}

ul,
ol {
  margin: 0 0 12px;
  padding-left: 22px;
}

li + li {
  margin-top: 6px;
}

a {
  color: var(--action);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

a:hover,
a:focus-visible {
  border-bottom-color: currentColor;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--action);
  outline-offset: 2px;
  border-radius: 4px;
}

strong {
  font-weight: 700;
}

.muted {
  color: var(--muted);
  font-size: 15px;
}

.section-lead {
  color: var(--muted);
  font-size: 17px;
  margin-bottom: 20px;
}

/* 跳到主要內容：只用鍵盤的人第一個 Tab 就會看到它。 */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--card);
  color: var(--action);
  padding: 10px 16px;
  border: 1px solid var(--action);
  border-radius: 0 0 var(--radius-sm) 0;
}

.skip-link:focus {
  left: 0;
}

/* ══════════ 導覽列 ══════════ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

/* 瀏覽器不支援 color-mix 時用不透明底色，避免導覽列透明到看不清。 */
@supports not (background: color-mix(in srgb, red 50%, blue)) {
  .site-header {
    background: var(--bg);
  }
}

.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  min-height: var(--nav-height);
  padding: 8px 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-bottom: none;
  color: var(--text);
  font-weight: 600;
  white-space: nowrap;
}

.brand-name {
  font-size: 16px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 14px;
  list-style: none;
  margin: 0 0 0 auto;
  padding: 0;
  font-size: 15px;
}

.nav-links li + li {
  margin-top: 0;
}

.nav-links a {
  color: var(--text);
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  border-bottom-color: var(--action);
}

/* 窄螢幕（≤ 430px）只留「支援／隱私」，其餘由頁面內的卡片與頁尾連過去，
   否則品牌 + 四項 + 語言鈕會換行擠壓。 */
@media (max-width: 430px) {
  .nav-links li:first-child,
  .nav-links li:nth-child(2) {
    display: none;
  }
  .nav-links {
    gap: 12px;
  }
}

.lang-toggle {
  flex: none;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 14px;
  min-height: 34px;
  cursor: pointer;
}

.lang-toggle:hover {
  border-color: var(--action);
}

/* ══════════ Logo（含後備圖示） ══════════ */
.logo-slot {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
}

/* 預設隱藏 <img>：圖檔不存在時不會出現破圖，只看到 emoji。
   JS 在載入成功後加上 .is-loaded 才顯示。 */
.logo-img {
  display: none;
  border-radius: 8px;
}

.logo-img.is-loaded {
  display: block;
}

.logo-img.is-loaded + .logo-fallback {
  display: none;
}

.logo-fallback {
  display: inline-block;
  font-size: 22px;
  line-height: 1;
}

.logo-slot--large {
  margin-bottom: 16px;
}

.logo-slot--large .logo-img {
  border-radius: 22px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.28);
}

.logo-slot--large .logo-fallback--large {
  font-size: 64px;
}

/* ══════════ Hero ══════════ */
.hero {
  margin: 20px 0 8px;
  padding: 36px 24px 32px;
  border-radius: 24px;
  background: var(--hero-grad);
  color: var(--on-hero);
  text-align: center;
  box-shadow: var(--shadow);
}

.hero h1 {
  font-size: 34px;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.hero-sub {
  font-size: 18px;
  font-weight: 600;
  color: var(--on-hero-muted);
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 16px;
  color: var(--on-hero);
  opacity: 0.92;
  max-width: 34em;
  margin: 0 auto 22px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.hero-note {
  margin-top: 18px;
  font-size: 14px;
  color: var(--on-hero-muted);
}

/* ══════════ 按鈕 ══════════ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 10px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease, background-color 0.12s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: #052e2b;
  border-color: var(--accent);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18);
}

.btn-primary:hover {
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.24);
}

.btn-primary.is-pending {
  background: transparent;
  color: var(--on-hero);
  border-color: var(--on-hero-muted);
  box-shadow: none;
  cursor: not-allowed;
}

.btn-primary.is-pending:hover {
  transform: none;
}

.btn-secondary {
  background: transparent;
  color: var(--on-hero);
  border-color: var(--on-hero-muted);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* ══════════ 卡片與步驟 ══════════ */
.cards {
  display: grid;
  gap: 14px;
  margin-bottom: 24px;
}

.steps {
  display: grid;
  gap: 14px;
  margin-bottom: 24px;
}

@media (min-width: 640px) {
  .cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.card,
.step-card,
.requirements,
.contact-card,
.cta-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 20px;
}

.card:hover,
.step-card:hover {
  box-shadow: var(--shadow-hover);
}

.card h3,
.step-card h3 {
  margin-bottom: 6px;
}

.card p,
.step-card p {
  color: var(--muted);
  font-size: 15.5px;
  margin-bottom: 0;
}

.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-bottom: 10px;
  border-radius: 12px;
  background: color-mix(in srgb, var(--accent) 28%, transparent);
  font-size: 20px;
}

@supports not (background: color-mix(in srgb, red 50%, blue)) {
  .card-icon {
    background: #E6FBF6;
  }
  @media (prefers-color-scheme: dark) {
    .card-icon {
      background: #10312E;
    }
  }
}

.step-card {
  position: relative;
  padding-left: 60px;
}

.step-number {
  position: absolute;
  left: 18px;
  top: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--brand);
  color: #FFFFFF;
  font-weight: 700;
  font-size: 15px;
}

/* ══════════ 需求清單 ══════════ */
.requirements {
  margin-bottom: 8px;
}

.requirements ul {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 15.5px;
}

/* ══════════ 下載 CTA ══════════ */
.cta-card {
  text-align: center;
  padding: 26px 22px;
}

.cta-lead {
  color: var(--muted);
  font-size: 16px;
  max-width: 34em;
  margin: 0 auto 18px;
}

.cta-note {
  margin-top: 14px;
  font-size: 14px;
  color: var(--muted);
}

/* ══════════ FAQ ══════════ */
.faq {
  display: grid;
  gap: 10px;
  margin-bottom: 22px;
}

.faq details {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  box-shadow: var(--shadow);
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.faq summary::-webkit-details-marker {
  display: none;
}

/* 自訂展開指示：details[open] 時轉 180 度。 */
.faq summary::after {
  content: "⌄";
  flex: none;
  font-size: 18px;
  line-height: 1;
  color: var(--muted);
  transition: transform 0.15s ease;
}

.faq details[open] summary::after {
  transform: rotate(180deg);
}

.faq details > *:not(summary) {
  color: var(--muted);
  font-size: 15.5px;
}

.faq details > ul,
.faq details > p {
  margin-top: 10px;
}

.contact-card {
  margin-bottom: 8px;
}

.contact-email {
  font-size: 18px;
  font-weight: 600;
  margin: 2px 0 10px;
  word-break: break-all;
}

/* ══════════ 隱私政策 ══════════ */
.updated {
  color: var(--muted);
  font-size: 15px;
  margin-bottom: 16px;
}

#privacy h3 {
  margin-top: 22px;
  color: var(--text);
}

#privacy ul {
  color: var(--muted);
  font-size: 16px;
}

#privacy p {
  font-size: 16px;
}

/* ══════════ Footer ══════════ */
.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 20px 48px;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  list-style: none;
  margin: 12px 0;
  padding: 0;
  font-size: 15px;
}

.footer-links li + li {
  margin-top: 0;
}

.footer-links a {
  color: var(--muted);
}

.footer-links a:hover {
  color: var(--action);
}

.fineprint {
  font-size: 13px;
  color: var(--muted);
  max-width: 46em;
  margin: 12px auto 0;
}

/* ══════════ 列印（審核員常把政策列印或存 PDF） ══════════ */
@media print {
  .site-header,
  .hero-actions,
  .lang-toggle,
  .skip-link,
  .site-footer .footer-links {
    display: none !important;
  }

  body {
    background: #FFFFFF;
    color: #000000;
    font-size: 11pt;
  }

  .hero {
    background: none;
    color: #000000;
    box-shadow: none;
    padding: 0 0 12px;
  }

  .hero-sub,
  .hero-lead,
  .hero-note {
    color: #000000;
    opacity: 1;
  }

  .card,
  .step-card,
  .requirements,
  .contact-card,
  .cta-card,
  .faq details {
    box-shadow: none;
    border: 1px solid #CCCCCC;
    break-inside: avoid;
  }

  a {
    color: #000000;
  }
}