:root {
  --bg: #f4f7f6;
  --surface: #ffffff;
  --surface-alt: #eaf2f0;
  --ink: #10262a;
  --ink-muted: #52706c;
  --teal: #0e7a70;
  --teal-bright: #14a89b;
  --navy: #163257;
  --orange: #ea7a1c;
  --gold: #b9860f;
  --silver: #7c8891;
  --bronze: #a06a3f;
  --flag-teal-deep: #0b6c82;
  --flag-gold: #f0b429;
  --border: #d7e3df;
  --shadow: 0 18px 40px -22px rgba(16, 38, 42, 0.35);
}

:root[data-theme="dark"] {
  --bg: #0a1f21;
  --surface: #10302e;
  --surface-alt: #123634;
  --ink: #e9f3f0;
  --ink-muted: #93b0ab;
  --teal: #35c3b4;
  --teal-bright: #2ea89b;
  --navy: #8fb0dd;
  --orange: #ff9a4d;
  --gold: #e2bd53;
  --silver: #9aa7ae;
  --bronze: #c58a5c;
  --flag-teal-deep: #0e83a0;
  --flag-gold: #ffcf5c;
  --border: #1e4744;
  --shadow: 0 22px 50px -20px rgba(0, 0, 0, 0.55);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0a1f21;
    --surface: #10302e;
    --surface-alt: #123634;
    --ink: #e9f3f0;
    --ink-muted: #93b0ab;
    --teal: #35c3b4;
    --teal-bright: #2ea89b;
    --navy: #8fb0dd;
    --orange: #ff9a4d;
    --gold: #e2bd53;
    --silver: #9aa7ae;
    --bronze: #c58a5c;
    --flag-teal-deep: #0e83a0;
    --flag-gold: #ffcf5c;
    --border: #1e4744;
    --shadow: 0 22px 50px -20px rgba(0, 0, 0, 0.55);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Helvetica Neue", Helvetica, "Segoe UI", Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.display {
  font-family: "Arial Black", "Helvetica Neue", Arial, sans-serif;
  font-weight: 900;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.mono {
  font-family: "SF Mono", "Cascadia Code", Consolas, Menlo, monospace;
  font-variant-numeric: tabular-nums;
}

.eyebrow {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal);
}

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.5rem;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.05rem;
  text-decoration: none;
}

.nav-mark {
  height: 54px;
  width: 54px;
  border-radius: 10px;
  object-fit: contain;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  gap: 1.6rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.92rem;
  font-weight: 600;
}

.nav-links a {
  text-decoration: none;
  color: var(--ink-muted);
  padding: 0.3rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--ink);
  border-color: var(--orange);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--orange);
  color: #fff;
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.88rem;
  text-decoration: none;
  white-space: nowrap;
  box-shadow: 0 8px 20px -8px color-mix(in srgb, var(--orange) 70%, transparent);
}

@media (max-width: 760px) {
  .nav-links { display: none; }
}

/* ---------- Flag stripe (brand ribbon) ---------- */
.flag-stripe {
  height: 6px;
  background: linear-gradient(90deg, var(--flag-teal-deep) 0 25%, var(--teal-bright) 25% 50%, var(--flag-gold) 50% 75%, var(--orange) 75% 100%);
}

/* ---------- Bunting (pennant flags) ---------- */
.bunting {
  line-height: 0;
  background: var(--flag-teal-deep);
}

/* ---------- Flag-gradient surfaces (hero + core team) ---------- */
.hero,
.dark-block {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(100deg, rgba(6, 30, 32, 0.58) 0%, rgba(6, 30, 32, 0.22) 45%, rgba(6, 30, 32, 0.04) 68%),
    repeating-linear-gradient(60deg, rgba(255, 255, 255, 0.1) 0 2px, transparent 2px 52px),
    repeating-linear-gradient(-60deg, rgba(255, 255, 255, 0.1) 0 2px, transparent 2px 52px),
    linear-gradient(135deg, var(--flag-teal-deep) 0%, var(--teal-bright) 32%, var(--flag-gold) 68%, var(--orange) 100%);
  color: #fff;
}

.hero {
  padding: 5.5rem 1.5rem 4.5rem;
}

.hero-inner {
  position: relative;
  max-width: 1240px;
  margin: 0 auto;
}

.hero-inner-split {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2.5rem;
}

.hero-copy {
  flex: 1 1 480px;
  min-width: 0;
}

.hero-jersey {
  flex: 0 0 auto;
  width: 380px;
  border-radius: 16px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.hero-jersey img {
  display: block;
  width: 100%;
  height: auto;
}

.hero-jersey-label {
  display: block;
  text-align: center;
  padding: 0.4rem 0.4rem 0.55rem;
  font-family: "Arial Black", sans-serif;
  font-weight: 900;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--navy);
}

@media (max-width: 820px) {
  .hero-inner-split { flex-direction: column; }
  .hero-jersey { width: min(380px, 100%); }
}

.hero .eyebrow,
.dark-block .eyebrow {
  color: #fff2d8;
}

.hero h1 {
  margin: 0.6rem 0 1.1rem;
  font-size: clamp(2rem, 4.2vw, 3.1rem);
  line-height: 1.05;
  text-transform: uppercase;
}

.hero h1 em {
  font-style: normal;
  color: #ffe3ac;
}

.hero p.lede {
  max-width: 46ch;
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.88);
  margin: 0 0 2.2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.5rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1.5px solid transparent;
  cursor: pointer;
}

.btn-solid {
  background: #fff;
  color: var(--navy);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.55);
}

.hero-stats {
  position: relative;
  max-width: 1240px;
  margin: 3.2rem auto 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: rgba(255, 255, 255, 0.18);
  border-radius: 14px;
  overflow: hidden;
}

.hero-stat {
  background: rgba(9, 35, 38, 0.35);
  padding: 1.2rem 1.4rem;
}

.hero-stat .num {
  font-family: "Arial Black", sans-serif;
  font-weight: 900;
  font-size: 1.9rem;
  font-variant-numeric: tabular-nums;
}

.hero-stat .label {
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.78);
  margin-top: 0.15rem;
}

@media (max-width: 700px) {
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- Sections ---------- */
section.page {
  max-width: 1240px;
  margin: 0 auto;
  padding: 4.5rem 1.5rem;
}

.section-head {
  max-width: 640px;
  margin: 0 auto 2.6rem;
  text-align: center;
}

.section-head h2 {
  margin: 0.5rem 0 0.7rem;
  font-size: clamp(1.7rem, 3.4vw, 2.3rem);
  text-transform: uppercase;
}

.section-head p {
  color: var(--ink-muted);
  margin: 0;
}

/* ---------- Schedule (lịch tập luyện) ---------- */
.schedule-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.4rem;
}

@media (max-width: 700px) {
  .schedule-grid { grid-template-columns: 1fr; }
}

.schedule-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 1.8rem 1.4rem;
  text-align: center;
}

.schedule-card.featured {
  border-color: var(--orange);
  background: linear-gradient(160deg, var(--surface), color-mix(in srgb, var(--orange) 10%, var(--surface)));
}

.schedule-day {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.schedule-time {
  font-family: "Arial Black", sans-serif;
  font-weight: 900;
  font-size: 2.4rem;
  color: var(--teal);
  margin: 0.3rem 0;
}

.schedule-card.featured .schedule-time {
  color: var(--orange);
}

.schedule-type {
  font-size: 0.92rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.schedule-note {
  margin: 1.8rem 0 0;
  text-align: center;
  font-size: 0.84rem;
  color: var(--ink-muted);
}

.schedule-note a {
  color: var(--teal);
  font-weight: 700;
  text-decoration: none;
}

.schedule-note a:hover {
  text-decoration: underline;
}

/* ---------- Hall of Fame ---------- */
.hof-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.6rem;
}

@media (max-width: 820px) {
  .hof-grid { grid-template-columns: 1fr; }
}

.hof-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.hof-card-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.6rem;
  padding: 1.15rem 1.3rem;
  background: linear-gradient(120deg, var(--navy), var(--teal));
  color: #fff;
}

.hof-card-head h3 {
  margin: 0;
  font-size: 1.15rem;
  text-transform: uppercase;
  letter-spacing: 0.01em;
}

.hof-card-head span {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.8);
  font-weight: 600;
}

.hof-table-wrap { overflow-x: auto; }

table.hof {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

table.hof th {
  text-align: left;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
  padding: 0.7rem 1.3rem 0.5rem;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

table.hof td {
  padding: 0.7rem 1.3rem;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

table.hof tbody tr:last-child td { border-bottom: none; }

table.hof tbody tr:hover { background: var(--surface-alt); }

.rank {
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  font-weight: 800;
  font-size: 0.8rem;
  color: #fff;
  background: var(--ink-muted);
}

.rank.r1 { background: linear-gradient(135deg, #e9c86b, var(--gold)); color: #3a2a05; }
.rank.r2 { background: linear-gradient(135deg, #cfd8dd, var(--silver)); color: #24333a; }
.rank.r3 { background: linear-gradient(135deg, #d9a675, var(--bronze)); color: #3a2308; }

.runner-name { font-weight: 700; }
.runner-race { display: block; font-size: 0.78rem; color: var(--ink-muted); font-weight: 400; margin-top: 0.1rem; white-space: normal; }

td.time { font-weight: 700; color: var(--teal); }

.hof-empty {
  padding: 2.4rem 1.3rem;
  text-align: center;
  color: var(--ink-muted);
  font-size: 0.9rem;
}

/* ---------- About ---------- */
.about {
  background: var(--surface-alt);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2.8rem;
  align-items: center;
}

@media (max-width: 820px) {
  .about-grid { grid-template-columns: 1fr; }
}

.about h2 { text-align: left; margin: 0.5rem 0 1rem; font-size: clamp(1.6rem, 3vw, 2.1rem); text-transform: uppercase; }

.about p { color: var(--ink-muted); max-width: 56ch; }

.about-pillars {
  display: grid;
  gap: 1rem;
}

.pillar {
  display: flex;
  gap: 0.9rem;
  padding: 1.1rem 1.2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.pillar-mark {
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--surface-alt);
  display: grid;
  place-items: center;
  font-weight: 900;
  color: var(--teal);
  font-family: "Arial Black", sans-serif;
  font-size: 0.95rem;
}

.pillar h4 { margin: 0 0 0.2rem; font-size: 0.98rem; }
.pillar p { margin: 0; font-size: 0.86rem; color: var(--ink-muted); }

/* ---------- Core Team ---------- */
.dark-block .section-head p { color: rgba(255, 255, 255, 0.85); }

.core-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.5rem 1.2rem;
  margin-top: 1rem;
}

@media (max-width: 900px) {
  .core-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 560px) {
  .core-grid { grid-template-columns: repeat(2, 1fr); }
}

.core-card {
  position: relative;
  background: rgba(6, 26, 28, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 14px;
  padding: 1.5rem 0.7rem 1.15rem;
  text-align: center;
  backdrop-filter: blur(3px);
}

.core-num {
  position: absolute;
  top: -11px;
  left: -9px;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--flag-teal-deep), var(--flag-gold));
  color: #16262a;
  display: grid;
  place-items: center;
  font-weight: 900;
  font-size: 0.95rem;
  box-shadow: 0 6px 14px -4px rgba(0, 0, 0, 0.6);
}

.core-avatar {
  width: 128px;
  height: 128px;
  border-radius: 50%;
  margin: 0.2rem auto 0.8rem;
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 800;
  font-size: 1.9rem;
  letter-spacing: 0.02em;
  font-family: "Arial Black", sans-serif;
}

.core-avatar-photo {
  display: block;
  object-fit: cover;
  object-position: center;
  border: 2px solid rgba(255, 255, 255, 0.55);
}

.core-name {
  font-size: 0.82rem;
  font-weight: 700;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  line-height: 1.3;
}

.core-tagline {
  margin: 2.8rem 0 0;
  padding-top: 1.8rem;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0 1.6rem;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.85);
}

.core-tagline span:not(:last-child)::after {
  content: "·";
  margin-left: 1.6rem;
  color: rgba(255, 255, 255, 0.35);
}

/* ---------- Gallery preview (thư viện ảnh/video) ---------- */
.gallery-preview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

@media (max-width: 820px) {
  .gallery-preview-grid { grid-template-columns: repeat(2, 1fr); }
}

.gallery-preview-item {
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  aspect-ratio: 1 / 1;
}

.gallery-preview-item img,
.gallery-preview-item iframe {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border: none;
}

.gallery-preview-empty {
  text-align: center;
  color: var(--ink-muted);
  padding: 2.4rem 1.3rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
}

.gallery-preview-cta {
  text-align: center;
  margin-top: 2rem;
}

.btn-solid-alt {
  background: var(--teal);
  color: #fff;
}

/* ---------- Footer ---------- */
footer.site {
  border-top: 1px solid var(--border);
  padding: 2.6rem 1.5rem 3rem;
  text-align: center;
}

footer.site .foot-brand {
  font-weight: 800;
  letter-spacing: 0.04em;
}

footer.site .foot-links {
  display: flex;
  justify-content: center;
  gap: 1.4rem;
  margin: 0.9rem 0;
  font-size: 0.85rem;
  color: var(--ink-muted);
  flex-wrap: wrap;
}

footer.site .foot-links a { text-decoration: none; }
footer.site .foot-links a:hover { color: var(--teal); }

footer.site .foot-social {
  display: flex;
  justify-content: center;
  gap: 1rem;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

footer.site .foot-social a {
  text-decoration: none;
  color: var(--teal);
}

footer.site .foot-social a:hover { color: var(--orange); }

footer.site .credit {
  margin-top: 1.1rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}