/* =============================================================
   IOAI Taiwan ｜ v2 極簡版
   ============================================================= */

:root {
  --c-primary: #4d4398;        /* 主色，深紫藍 */
  --c-primary-dark: #3a3275;   /* 深一階，用於 hover/active、深色標題 */
  --c-accent: #b8a9e0;         /* 強調色，淡紫 */
  --c-accent-soft: #ece7f7;    /* tag/badge 背景用，比 accent 更淡 */
  --c-text: #1f2937;
  --c-muted: #6b7280;
  --c-border: #e5e7eb;
  --c-bg: #ffffff;
  --c-bg-soft: #f7f5fb;        /* 微帶紫的米白 */
  --c-primary-rgb: 77, 67, 152; /* 用於 shadow 等 rgba */
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Noto Sans TC', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--c-text);
  line-height: 1.7;
  background: var(--c-bg);
  font-size: 16px;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Noto Sans TC', sans-serif;
  font-weight: 700;
  color: var(--c-text);
  line-height: 1.35;
  margin-top: 0;
}

a { color: var(--c-primary); text-decoration: none; }
a:hover { color: var(--c-primary-dark); text-decoration: underline; }

p { margin: 0 0 1rem 0; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Nav ===== */
.site-nav {
  background: #fff;
  border-bottom: 1px solid var(--c-border);
  padding: 18px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
  text-decoration: none;
}
.brand-mark {
  font-weight: 900;
  font-size: 1.4rem;
  color: var(--c-primary);
  letter-spacing: 0.02em;
}
.brand-sub {
  font-weight: 500;
  font-size: 1rem;
  color: var(--c-text);
}
.brand:hover { text-decoration: none; }

.nav-links {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 28px;
  align-items: center;
}
.nav-links a {
  color: var(--c-text);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}
.nav-links a:hover {
  color: var(--c-primary);
  text-decoration: none;
}
.nav-links a.active {
  color: var(--c-primary);
  border-bottom-color: var(--c-primary);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--c-text);
  cursor: pointer;
}

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    flex-direction: column;
    background: #fff;
    border-bottom: 1px solid var(--c-border);
    gap: 0;
    padding: 12px 0;
  }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; }
  .nav-links a {
    display: block;
    padding: 12px 24px;
    border-bottom: 1px solid var(--c-border);
  }
  .nav-links a.active { border-bottom-color: var(--c-border); background: var(--c-bg-soft); }
}

/* ===== Hero ===== */
.hero {
  padding: 80px 0 60px;
  background: linear-gradient(180deg, #f3f0fa 0%, #fff 100%); /* 淡紫漸層 */
  text-align: center;
}
.hero-tag {
  display: inline-block;
  background: var(--c-accent-soft);
  color: var(--c-primary-dark);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}
.hero h1 {
  font-size: 2.6rem;
  margin: 0 0 20px 0;
}
.hero p.lead {
  font-size: 1.1rem;
  color: var(--c-muted);
  max-width: 720px;
  margin: 0 auto 30px;
}
.hero-meta {
  display: inline-flex;
  gap: 32px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 8px;
  padding-top: 24px;
  border-top: 1px solid var(--c-border);
  max-width: 720px;
  width: 100%;
}
.hero-meta-item .label {
  display: block;
  font-size: 0.8rem;
  color: var(--c-muted);
  margin-bottom: 4px;
}
.hero-meta-item .val {
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-text);
}

@media (max-width: 700px) {
  .hero h1 { font-size: 1.8rem; }
  .hero { padding: 50px 0 40px; }
  .hero-meta { gap: 20px; }
}

/* ===== Section ===== */
.section { padding: 70px 0; }
.section-sm { padding: 50px 0; }
.section-tight { padding: 40px 0; }
.section-bg { background: var(--c-bg-soft); }

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 50px;
}
.section-head h2 {
  font-size: 1.9rem;
  margin: 0 0 12px;
}
.section-head p {
  color: var(--c-muted);
  margin: 0;
}

/* ===== Quick Links 6 格 ===== */
.quick-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
@media (max-width: 900px) { .quick-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .quick-grid { grid-template-columns: 1fr; } }

.quick-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  padding: 28px 24px;
  text-decoration: none;
  color: var(--c-text);
  transition: all 0.2s;
  display: block;
}
.quick-card:hover {
  border-color: var(--c-primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px -10px rgba(var(--c-primary-rgb), 0.3); /* 主色陰影 */
  text-decoration: none;
  color: var(--c-text);
}
.quick-card h3 {
  font-size: 1.15rem;
  margin: 0 0 8px;
  color: var(--c-primary);
}
.quick-card p {
  font-size: 0.92rem;
  color: var(--c-muted);
  margin: 0;
}
.quick-arrow {
  font-size: 0.9rem;
  color: var(--c-primary);
  margin-top: 12px;
  font-weight: 500;
}

/* ===== News list ===== */
.news-list { border-top: 1px solid var(--c-border); }
.news-item {
  display: flex;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--c-border);
}
.news-date {
  flex-shrink: 0;
  width: 110px;
  color: var(--c-muted);
  font-size: 0.9rem;
  font-weight: 500;
  font-family: 'Inter', monospace;
}
.news-body h3 {
  font-size: 1.1rem;
  margin: 0 0 8px;
}
.news-body p {
  margin: 0;
  color: var(--c-muted);
  font-size: 0.95rem;
}
.news-tag {
  display: inline-block;
  font-size: 0.75rem;
  padding: 2px 10px;
  border-radius: 12px;
  margin-right: 8px;
  vertical-align: middle;
}
.news-tag-announce { background: #fef3c7; color: #92400e; }       /* 公告：保留警示黃 */
.news-tag-event    { background: var(--c-accent-soft); color: var(--c-primary-dark); } /* 活動：主題紫 */
.news-tag-result   { background: #d1fae5; color: #065f46; }       /* 成績：保留成功綠 */

@media (max-width: 600px) {
  .news-item { flex-direction: column; gap: 8px; }
  .news-date { width: auto; }
}

/* ===== Sponsors / Partners bar ===== */
.partners {
  display: flex;
  justify-content: center;
  gap: 60px;
  flex-wrap: wrap;
  align-items: center;
  padding: 40px 0;
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
  background: var(--c-bg-soft);
}
.partner-item { text-align: center; }
.partner-name {
  font-size: 0.95rem;
  color: var(--c-text);
  font-weight: 600;
}
.partner-role {
  font-size: 0.8rem;
  color: var(--c-muted);
  margin-top: 2px;
}

/* ===== Footer ===== */
.site-foot {
  background: #2e2930;
  color: #d1d5db;
  padding: 50px 0 24px;
  font-size: 0.92rem;
}
.site-foot a { color: var(--c-accent); }      /* 淡紫，與主題一致 */
.site-foot a:hover { color: #fff; }
.foot-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 40px;
}
.foot-grid h4 {
  color: #fff;
  font-size: 1rem;
  margin: 0 0 16px;
}
.foot-grid ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.foot-grid ul li { margin-bottom: 8px; }
.foot-bottom {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid #374151;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
  color: #9ca3af;
}
@media (max-width: 700px) {
  .foot-grid { grid-template-columns: 1fr; gap: 30px; }
}

/* ===== 內頁 ===== */
.page-head {
  padding: 50px 0 40px;
  background: var(--c-bg-soft);
  border-bottom: 1px solid var(--c-border);
}
.page-head .crumb {
  color: var(--c-muted);
  font-size: 0.9rem;
  margin-bottom: 8px;
}
.page-head h1 {
  font-size: 2rem;
  margin: 0;
}

.content-wrap {
  max-width: 800px;
  margin: 0 auto;
}
.content-wrap h2 {
  font-size: 1.5rem;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--c-primary);
  display: inline-block;
}
.content-wrap h3 {
  font-size: 1.15rem;
  margin: 28px 0 12px;
  color: var(--c-primary-dark);
}
.content-wrap ul, .content-wrap ol { padding-left: 1.4rem; }
.content-wrap li { margin-bottom: 6px; }

/* info table */
.info-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 0.95rem;
}
.info-table th, .info-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--c-border);
  text-align: left;
  vertical-align: top;
}
.info-table th {
  background: var(--c-bg-soft);
  font-weight: 600;
  width: 140px;
  color: var(--c-text);
}

/* Year card (歷年表現) */
.year-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  padding: 28px;
  margin-bottom: 24px;
}
.year-card-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 8px;
}
.year-card h3 {
  margin: 0;
  font-size: 1.3rem;
  color: var(--c-primary);
}
.year-card .yc-loc {
  color: var(--c-muted);
  font-size: 0.95rem;
}
.year-card .yc-result {
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: 12px;
}
.year-card .yc-result .badge {
  display: inline-block;
  padding: 3px 10px;
  background: var(--c-accent-soft);     /* 紫色 badge */
  color: var(--c-primary-dark);
  border-radius: 12px;
  font-size: 0.85rem;
  margin-right: 8px;
}
.year-card .yc-members {
  font-size: 0.93rem;
  color: var(--c-muted);
}

/* FAQ */
.faq-block { margin-bottom: 12px; }
.faq-q {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  padding: 16px 20px;
  cursor: pointer;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}
.faq-q:hover { background: var(--c-bg-soft); }
.faq-block.open .faq-q { border-radius: 8px 8px 0 0; border-bottom-color: transparent; }
.faq-q .ico {
  color: var(--c-primary);
  font-size: 1.3rem;
  font-weight: 300;
  line-height: 1;
  width: 20px;
  text-align: center;
  transition: transform 0.2s;
}
.faq-block.open .faq-q .ico { transform: rotate(45deg); }
.faq-a {
  display: none;
  padding: 0 20px 16px;
  border: 1px solid var(--c-border);
  border-top: none;
  border-radius: 0 0 8px 8px;
  background: #fff;
  color: var(--c-text);
}
.faq-block.open .faq-a { display: block; }
.faq-a p { margin: 12px 0 0; }
.faq-cat {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--c-primary);
  margin: 32px 0 16px;
}
.faq-cat:first-of-type { margin-top: 0; }

/* Button */
.btn {
  display: inline-block;
  padding: 12px 28px;
  background: var(--c-primary);
  color: #fff !important;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 500;
  border: 1px solid var(--c-primary);
  transition: all 0.2s;
}
.btn:hover {
  background: var(--c-primary-dark);
  border-color: var(--c-primary-dark);
  color: #fff !important;
  text-decoration: none;
}
.btn-outline {
  background: transparent;
  color: var(--c-primary) !important;
}
.btn-outline:hover {
  background: var(--c-primary);
  color: #fff !important;
}

/* note box */
.note {
  background: #f3f0fa;                  /* 與 hero 漸層上端一致的淡紫 */
  border-left: 4px solid var(--c-primary);
  padding: 16px 20px;
  margin: 20px 0;
  border-radius: 0 6px 6px 0;
  font-size: 0.95rem;
}
.note strong { color: var(--c-primary-dark); }

/* org card */
.org-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 16px;
}
.org-card .role {
  font-size: 0.85rem;
  color: var(--c-primary);
  font-weight: 600;
  margin-bottom: 4px;
}
.org-card h4 {
  margin: 0 0 4px;
  font-size: 1.1rem;
}
.org-card .affil {
  font-size: 0.92rem;
  color: var(--c-muted);
}

/* Stage card (報名方式頁) */
.stage {
  border-left: 3px solid var(--c-primary);
  padding: 4px 0 4px 20px;
  margin-bottom: 28px;
}
.stage .stage-label {
  font-size: 0.85rem;
  color: var(--c-primary);
  font-weight: 600;
  margin-bottom: 4px;
}
.stage h3 {
  margin: 0 0 6px;
  font-size: 1.2rem;
}
.stage p { margin: 0; color: var(--c-muted); font-size: 0.95rem; }