/* ===========================================================
   THEME TOKENS — giá trị mặc định, sẽ bị script.js override
   bằng màu lấy từ config.js (theme{}) cho từng phòng tập.
   =========================================================== */
:root {
  --color-primary: #e4232b;
  --color-primary-dark: #b5171d;
  --color-dark: #0b0b0c;
  --color-dark2: #17181a;
  --color-light: #f5f5f3;
  --color-muted: #9a9a9e;
  --font-heading: "Bebas Neue", "Oswald", sans-serif;
  --font-body: "Inter", "Be Vietnam Pro", sans-serif;
  --radius: 10px;
  --container-w: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--color-dark);
  color: var(--color-light);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
h1, h2, h3 {
  font-family: var(--font-heading);
  letter-spacing: 0.5px;
  line-height: 1.1;
  margin: 0 0 16px;
}
p { margin: 0 0 12px; color: var(--color-muted); }
a { color: inherit; text-decoration: none; }

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 20px;
}
.container--narrow { max-width: 780px; }

.section { padding: 72px 0; }
.section--dark2 { background: var(--color-dark2); }
.section__title {
  text-align: center;
  font-size: clamp(28px, 4vw, 42px);
  margin-bottom: 40px;
  color: var(--color-light);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 700;
  border-radius: var(--radius);
  padding: 14px 28px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, opacity 0.15s ease;
  font-size: 15px;
}
.btn:hover { transform: translateY(-2px); }
.btn--primary { background: var(--color-primary); color: #fff; }
.btn--primary:hover { background: var(--color-primary-dark); }
.btn--light { background: var(--color-light); color: var(--color-dark); }
.btn--outline { background: transparent; border-color: var(--color-primary); color: var(--color-light); }
.btn--sm { padding: 9px 16px; font-size: 13px; }
.btn--lg { padding: 17px 36px; font-size: 16px; }
.btn--block { width: 100%; }

/* ---------- Header ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 11, 12, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand__logo { height: 36px; width: auto; }
.brand__name { font-family: var(--font-heading); font-size: 22px; letter-spacing: 1px; }
.header__contact { display: flex; align-items: center; gap: 16px; }
.header__phone { display: flex; align-items: center; gap: 6px; font-weight: 700; }
.header__phone .icon { color: var(--color-primary); }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 56px 0 80px; overflow: hidden; }
.hero__bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  filter: brightness(0.55);
}
.hero__overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(11,11,12,0.3) 0%, var(--color-dark) 100%);
}
.hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.2fr 0.9fr;
  gap: 48px;
  align-items: center;
}
.eyebrow {
  color: var(--color-primary);
  font-weight: 700;
  letter-spacing: 2px;
  font-size: 13px;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.hero__title { font-size: clamp(36px, 6vw, 64px); }
.hero__title .highlight { color: var(--color-primary); display: block; }
.hero__subtitle { font-size: 18px; max-width: 520px; color: var(--color-light); opacity: 0.85; }

.hero__form {
  background: rgba(23, 24, 26, 0.92);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}
.hero__form h3 { font-size: 24px; margin-bottom: 6px; }
.form__subtitle { font-size: 14px; margin-bottom: 20px; }
.field { display: block; margin-bottom: 14px; font-size: 13px; font-weight: 600; }
.field span { display: block; margin-bottom: 6px; }
.field input, .field select {
  width: 100%;
  padding: 12px 14px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.15);
  background: var(--color-dark);
  color: var(--color-light);
  font-size: 15px;
  font-family: var(--font-body);
}
.field input:focus, .field select:focus { outline: 2px solid var(--color-primary); }
.form__note { font-size: 12px; opacity: 0.6; text-align: center; margin-top: 12px; margin-bottom: 0; }
.form__success {
  margin-top: 14px; padding: 12px; border-radius: 8px;
  background: rgba(228,35,43,0.15); color: var(--color-light);
  text-align: center; font-weight: 600; font-size: 14px;
}

/* ---------- Grids / Cards ---------- */
.grid { display: grid; gap: 24px; }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--color-dark2);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 24px;
}
.card--pain { text-align: center; }
.card__icon { font-size: 34px; display: block; margin-bottom: 12px; }
.card__text { color: var(--color-light); opacity: 0.85; font-size: 15px; margin: 0; }
.card--benefit { text-align: center; }
.card--benefit .card__title { font-size: 19px; margin-bottom: 8px; }

.card--testimonial { text-align: center; }
.testimonial__avatar {
  width: 64px; height: 64px; border-radius: 50%;
  object-fit: cover; margin: 0 auto 14px; border: 2px solid var(--color-primary);
}
.testimonial__quote { color: var(--color-light); font-style: italic; opacity: 0.9; }
.testimonial__name { color: var(--color-light); font-weight: 700; margin-bottom: 0; }
.testimonial__role { font-size: 13px; margin: 0; }

.card--branch { padding: 0; overflow: hidden; }
.branch__image { width: 100%; height: 180px; object-fit: cover; }
.branch__body { padding: 20px; }
.branch__name { font-size: 20px; margin-bottom: 6px; }
.branch__address { font-size: 14px; margin-bottom: 14px; }
.branch__actions { margin-bottom: 10px; }
.branch__map summary { cursor: pointer; font-size: 13px; color: var(--color-primary); font-weight: 600; }
.branch__map iframe { width: 100%; height: 200px; border: 0; border-radius: 8px; margin-top: 12px; }

/* ---------- Offer ---------- */
.offer {
  background: linear-gradient(120deg, var(--color-primary), var(--color-primary-dark));
  padding: 56px 0;
}
.offer__inner { text-align: center; }
.offer .badge {
  display: inline-block; background: rgba(255,255,255,0.2);
  padding: 6px 16px; border-radius: 999px; font-size: 12px;
  font-weight: 700; letter-spacing: 1px; margin-bottom: 16px;
}
.offer h2 { color: #fff; font-size: clamp(26px, 4vw, 38px); }
.offer p { color: rgba(255,255,255,0.9); max-width: 560px; margin: 0 auto 24px; }

/* ---------- FAQ ---------- */
.faq__item {
  background: var(--color-dark);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 8px;
  padding: 16px 20px;
  margin-bottom: 12px;
}
.faq__question { cursor: pointer; font-weight: 700; color: var(--color-light); }
.faq__answer { margin-top: 10px; margin-bottom: 0; }

/* ---------- Final CTA ---------- */
.final-cta { text-align: center; padding: 80px 0; }
.final-cta h2 { font-size: clamp(28px, 4vw, 40px); margin-bottom: 24px; }

/* ---------- Footer ---------- */
.footer { padding: 40px 0; border-top: 1px solid rgba(255,255,255,0.08); }
.footer__inner { display: flex; flex-direction: column; align-items: center; gap: 16px; text-align: center; }
.footer__brand { display: flex; align-items: center; gap: 10px; }
.footer__social { display: flex; gap: 16px; }
.social__link {
  width: 38px; height: 38px; border-radius: 50%;
  background: var(--color-dark2); display: flex; align-items: center; justify-content: center;
  font-size: 16px;
}
.footer__copy { font-size: 13px; margin: 0; }

/* ---------- Sticky mobile CTA ---------- */
.sticky-bar {
  position: fixed; bottom: 0; left: 0; right: 0;
  display: none;
  background: var(--color-dark2);
  border-top: 1px solid rgba(255,255,255,0.1);
  z-index: 60;
  padding: 10px 12px;
  gap: 8px;
}
.sticky-bar__btn {
  flex: 1; text-align: center; padding: 12px 8px;
  border-radius: 8px; background: rgba(255,255,255,0.06);
  font-weight: 700; font-size: 13px;
}
.sticky-bar__btn--primary { background: var(--color-primary); }

/* ===========================================================
   RESPONSIVE
   =========================================================== */
@media (max-width: 960px) {
  .hero__inner { grid-template-columns: 1fr; }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .grid--2 { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .header__phone span:last-child { display: none; }
  .section { padding: 52px 0; }
  .grid--4, .grid--3 { grid-template-columns: 1fr; }
  .sticky-bar { display: flex; }
  body { padding-bottom: 68px; } /* chừa chỗ cho sticky bar */
}