/* BESTME CAMP — 贝斯丽 AI 研学 */
:root {
  --brand: #8f1f28;
  --brand-deep: #6b151c;
  --brand-soft: #c45a62;
  --ink: #1c1412;
  --ink-muted: #5c4f4a;
  --paper: #f7f2ef;
  --paper-2: #efe6e1;
  --line: rgba(143, 31, 40, 0.16);
  --white: #fffdfb;
  --max: 1120px;
  --nav-h: 72px;
  --font-display: "Cormorant Garamond", "Noto Serif SC", serif;
  --font-serif: "Noto Serif SC", "Songti SC", serif;
  --font-sans: "Source Sans 3", "Noto Sans SC", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(143, 31, 40, 0.08), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(196, 90, 98, 0.1), transparent 50%),
    linear-gradient(180deg, var(--paper) 0%, var(--white) 40%, var(--paper-2) 100%);
  min-height: 100vh;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
textarea {
  font: inherit;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--brand);
  color: white;
  padding: 0.5rem 1rem;
  z-index: 1000;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

/* —— Nav —— */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background 0.35s ease, box-shadow 0.35s ease, backdrop-filter 0.35s ease;
}

.site-header.is-scrolled {
  background: rgba(247, 242, 239, 0.9);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--line);
}

.nav-inner {
  width: min(var(--max), calc(100% - 2.5rem));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand img {
  width: 44px;
  height: 44px;
  object-fit: contain;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-text strong {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.12em;
  color: var(--brand);
}

.brand-text span {
  font-size: 0.72rem;
  color: var(--ink-muted);
  letter-spacing: 0.04em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-size: 0.95rem;
  color: var(--ink-muted);
  position: relative;
  transition: color 0.2s ease;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--brand);
}

.nav-links a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.35rem;
  height: 2px;
  background: var(--brand);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 1.1rem;
  background: var(--brand);
  color: var(--white) !important;
  border-radius: 2px;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  transition: background 0.2s ease, transform 0.2s ease;
}

.nav-cta:hover {
  background: var(--brand-deep);
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: transparent;
  border-radius: 2px;
  cursor: pointer;
  position: relative;
}

.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 11px;
  right: 11px;
  height: 1.5px;
  background: var(--brand);
  transition: transform 0.25s ease, top 0.25s ease;
}

.nav-toggle span {
  top: 50%;
  transform: translateY(-50%);
}

.nav-toggle span::before {
  top: -7px;
}

.nav-toggle span::after {
  top: 7px;
}

.nav-toggle[aria-expanded="true"] span {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] span::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span::after {
  top: 0;
  transform: rotate(-45deg);
}

/* —— Buttons —— */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0.75rem 1.4rem;
  border-radius: 2px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
  font-size: 0.98rem;
  letter-spacing: 0.03em;
}

.btn-primary {
  background: var(--brand);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--brand-deep);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--white);
  border-color: rgba(255, 253, 251, 0.55);
}

.btn-ghost:hover {
  background: rgba(255, 253, 251, 0.12);
}

.btn-outline {
  background: transparent;
  color: var(--brand);
  border-color: var(--brand);
}

.btn-outline:hover {
  background: var(--brand);
  color: var(--white);
}

.cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

/* —— Hero —— */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  align-items: end;
  color: var(--white);
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.06);
  animation: heroDrift 18s ease-in-out infinite alternate;
}

.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(28, 20, 18, 0.35) 0%, rgba(28, 20, 18, 0.2) 35%, rgba(28, 20, 18, 0.78) 100%),
    linear-gradient(90deg, rgba(107, 21, 28, 0.35), transparent 55%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(var(--max), calc(100% - 2.5rem));
  margin: 0 auto;
  padding: calc(var(--nav-h) + 3rem) 0 4.5rem;
}

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 8vw, 5.2rem);
  font-weight: 600;
  letter-spacing: 0.14em;
  line-height: 0.95;
  margin: 0 0 1.25rem;
  color: var(--white);
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.25);
  opacity: 0;
  transform: translateY(18px);
  animation: riseIn 0.9s ease 0.15s forwards;
}

.hero h1 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.55rem, 3.4vw, 2.35rem);
  line-height: 1.4;
  margin: 0 0 0.85rem;
  max-width: 18em;
  white-space: nowrap;
  opacity: 0;
  transform: translateY(18px);
  animation: riseIn 0.9s ease 0.35s forwards;
}

.hero-lead {
  margin: 0 0 1.75rem;
  max-width: 28em;
  font-size: 1.05rem;
  color: rgba(255, 253, 251, 0.88);
  opacity: 0;
  transform: translateY(18px);
  animation: riseIn 0.9s ease 0.5s forwards;
}

@media (max-width: 560px) {
  .hero h1 {
    white-space: normal;
    max-width: 12em;
  }
}

.hero .cta-group {
  opacity: 0;
  transform: translateY(18px);
  animation: riseIn 0.9s ease 0.65s forwards;
}

@keyframes riseIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes heroDrift {
  from {
    transform: scale(1.06) translate3d(0, 0, 0);
  }
  to {
    transform: scale(1.12) translate3d(-1.5%, -1%, 0);
  }
}

/* —— Sections —— */
.section {
  padding: clamp(4rem, 8vw, 6.5rem) 0;
}

.section-inner {
  width: min(var(--max), calc(100% - 2.5rem));
  margin: 0 auto;
}

.section-head {
  max-width: 38rem;
  margin-bottom: 2.5rem;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--brand);
  margin-bottom: 0.65rem;
}

.section h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.7rem, 3vw, 2.35rem);
  font-weight: 600;
  line-height: 1.3;
  margin: 0 0 0.85rem;
}

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

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Home: direction */
.direction-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: end;
}

.direction-visual {
  position: relative;
  min-height: 420px;
  overflow: hidden;
  border-radius: 2px;
}

.direction-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 420px;
}

.direction-copy h2 {
  max-width: 12ch;
}

.feature-list {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.feature-list li {
  padding-left: 1.15rem;
  border-left: 2px solid var(--brand);
  color: var(--ink-muted);
}

.feature-list strong {
  display: block;
  color: var(--ink);
  font-family: var(--font-serif);
  font-weight: 600;
  margin-bottom: 0.15rem;
}

/* Proof band */
.proof {
  background:
    linear-gradient(135deg, var(--brand-deep), var(--brand) 55%, #a8333d);
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.proof::before {
  content: "";
  position: absolute;
  inset: auto -10% -40% auto;
  width: 420px;
  height: 420px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 50%;
}

.proof-inner {
  width: min(var(--max), calc(100% - 2.5rem));
  margin: 0 auto;
  padding: clamp(3.5rem, 7vw, 5rem) 0;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
  align-items: center;
  position: relative;
}

.proof h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin: 0 0 0.75rem;
  font-weight: 600;
}

.proof p {
  margin: 0;
  color: rgba(255, 253, 251, 0.88);
  max-width: 36ch;
}

.proof-stat {
  font-family: var(--font-display);
  font-size: clamp(4rem, 10vw, 6.5rem);
  line-height: 0.9;
  letter-spacing: 0.04em;
  margin: 0;
}

.proof-stat span {
  display: block;
  font-family: var(--font-sans);
  font-size: 1rem;
  letter-spacing: 0.08em;
  margin-top: 0.75rem;
  opacity: 0.85;
}

/* Page hero (inner pages) */
.page-hero {
  padding: calc(var(--nav-h) + 3.5rem) 0 2.5rem;
}

.page-hero .section-inner {
  max-width: 40rem;
}

.page-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 2.8rem);
  margin: 0 0 0.75rem;
  font-weight: 600;
}

.page-hero p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 1.08rem;
}

/* Content layouts */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.timeline {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.timeline-item {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: 1.25rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
}

.timeline-item time {
  font-family: var(--font-display);
  color: var(--brand);
  letter-spacing: 0.06em;
  font-size: 1.05rem;
}

.timeline-item h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  margin: 0 0 0.35rem;
  font-weight: 600;
}

.timeline-item p {
  margin: 0;
  color: var(--ink-muted);
}

.contact-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 4vw, 3rem);
  padding: 2.25rem;
  background:
    linear-gradient(160deg, rgba(255, 253, 251, 0.9), rgba(239, 230, 225, 0.85));
  border: 1px solid var(--line);
  border-radius: 2px;
}

.contact-list {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.1rem;
}

.contact-list li {
  display: grid;
  gap: 0.2rem;
}

.contact-list span {
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brand);
}

.contact-list strong,
.contact-list a {
  font-size: 1.08rem;
  font-weight: 600;
}

.wechat-box {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1rem;
  padding: 1.5rem;
  background: var(--white);
  border: 1px dashed var(--line);
}

.wechat-id {
  font-family: var(--font-display);
  font-size: 2rem;
  letter-spacing: 0.08em;
  color: var(--brand);
  margin: 0;
}

.copy-hint {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.95rem;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 1.5rem;
  transform: translateX(-50%) translateY(120%);
  background: var(--ink);
  color: var(--white);
  padding: 0.7rem 1.1rem;
  border-radius: 2px;
  font-size: 0.92rem;
  z-index: 80;
  transition: transform 0.3s ease;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 2.5rem 0 2rem;
  margin-top: 2rem;
}

.footer-inner {
  width: min(var(--max), calc(100% - 2.5rem));
  margin: 0 auto;
  display: grid;
  gap: 1rem;
}

.footer-brand {
  font-family: var(--font-display);
  letter-spacing: 0.14em;
  color: var(--brand);
  font-size: 1.2rem;
}

.footer-meta {
  color: var(--ink-muted);
  font-size: 0.9rem;
  display: grid;
  gap: 0.35rem;
}

.footer-meta small {
  display: block;
  opacity: 0.8;
}

/* Responsive */
@media (max-width: 860px) {
  .nav-toggle {
    display: inline-block;
  }

  .nav-links {
    position: fixed;
    inset: var(--nav-h) 0 auto;
    background: rgba(247, 242, 239, 0.97);
    backdrop-filter: blur(12px);
    flex-direction: column;
    align-items: flex-start;
    padding: 1.25rem 1.25rem 1.5rem;
    gap: 1.1rem;
    border-bottom: 1px solid var(--line);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s ease, opacity 0.3s ease;
  }

  .nav-links.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-cta {
    width: 100%;
  }

  .direction-grid,
  .proof-inner,
  .split,
  .contact-panel {
    grid-template-columns: 1fr;
  }

  .direction-visual,
  .direction-visual img {
    min-height: 280px;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

  .hero-content {
    padding-bottom: 3.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero-media img,
  .hero-brand,
  .hero h1,
  .hero-lead,
  .hero .cta-group,
  .reveal {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}