/* ============================================
   海贝英语官网 - style.css
   ============================================ */

/* ---------- 变量 ---------- */
:root {
  --blue:       #1A6FC4;
  --blue-light: #E8F1FB;
  --blue-dark:  #1255A0;
  --orange:     #F5A623;
  --orange-light: #FFF3E0;
  --white:      #FFFFFF;
  --gray-bg:    #F7F9FC;
  --gray-text:  #555555;
  --gray-light: #AAAAAA;
  --border:     #E0E7F0;
  --shadow:     rgba(26, 111, 196, 0.12);
  --radius:     12px;
  --radius-sm:  8px;
  --transition: 0.3s ease;
  --max-w:      1200px;
  --header-h:   72px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: #333;
  background: var(--white);
  line-height: 1.7;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
img { display: block; max-width: 100%; }
ul { list-style: none; }

/* ---------- 滚动条 ---------- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--gray-bg); }
::-webkit-scrollbar-thumb { background: var(--blue); border-radius: 3px; }

/* ---------- 容器 ---------- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: var(--transition);
}
.header.scrolled { box-shadow: 0 2px 20px var(--shadow); }

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Logo */
.logo { display: flex; align-items: center; gap: 10px; }
.logo__icon { font-size: 28px; line-height: 1; }
.logo__icon img { height: 36px; width: auto; object-fit: contain; border-radius: 4px; }
.logo__text {
  font-size: 22px;
  font-weight: 700;
  color: var(--blue);
  letter-spacing: 1px;
}

/* Nav */
.nav { display: flex; align-items: center; gap: 8px; }
.nav__link {
  font-size: 15px;
  font-weight: 500;
  color: var(--gray-text);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.nav__link:hover { color: var(--blue); background: var(--blue-light); }
.nav__link--cta {
  background: var(--blue);
  color: var(--white) !important;
  padding: 8px 22px;
}
.nav__link--cta:hover { background: var(--blue-dark); }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.hamburger span {
  display: block;
  width: 26px;
  height: 2.5px;
  background: var(--blue);
  border-radius: 2px;
  transition: var(--transition);
}
.hamburger.active span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* ---------- Section 通用 ---------- */
.section { padding: 88px 0; }
.section__header { text-align: center; margin-bottom: 56px; }
.section__tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--orange);
  text-transform: uppercase;
  margin-bottom: 10px;
}
.section__title {
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 700;
  color: var(--blue-dark);
  margin-bottom: 14px;
}
.section__desc { font-size: 16px; color: var(--gray-text); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #1a6fc4;
  background:
    linear-gradient(135deg, rgba(26,111,196,0.88) 0%, rgba(245,166,35,0.45) 100%),
    url('https://images.unsplash.com/photo-1503676260728-1c00da094a0b?w=1600&q=80') center/cover no-repeat;
  overflow: hidden;
}
.hero__overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(26,111,196,0.3), transparent 60%);
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: var(--white);
  padding: 0 24px;
  animation: fadeUp 1s ease both;
}
.hero__title {
  font-size: clamp(32px, 6vw, 64px);
  font-weight: 700;
  margin-bottom: 18px;
  line-height: 1.2;
  text-shadow: 0 2px 20px rgba(0,0,0,0.2);
}
.hero__title-divider { opacity: 0.6; margin: 0 8px; }
.hero__badge {
  display: inline-block;
  background: linear-gradient(135deg, #f6d362, #e8b923);
  color: #5a3e00;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 6px 18px;
  border-radius: 20px;
  border: 1.5px solid rgba(255,255,255,0.85);
  box-shadow: 0 2px 10px rgba(201,168,76,0.4);
  margin-bottom: 20px;
  text-shadow: 0 1px 0 rgba(255,255,255,0.5);
}
.hero__subtitle {
  font-size: clamp(16px, 2.5vw, 22px);
  font-weight: 400;
  opacity: 0.92;
  margin-bottom: 40px;
  letter-spacing: 2px;
}
.hero__btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.hero__scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255,255,255,0.75);
  font-size: 13px;
  letter-spacing: 2px;
  animation: bounce 2s infinite;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  padding: 14px 36px;
  font-size: 16px;
  font-weight: 600;
  border-radius: 50px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}
.btn--primary {
  background: var(--orange);
  color: var(--white);
  border-color: var(--orange);
}
.btn--primary:hover { background: #e8951a; border-color: #e8951a; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(245,166,35,0.4); }
.btn--outline { background: transparent; color: var(--white); border-color: var(--white); }
.btn--outline:hover { background: var(--white); color: var(--blue); }
.btn--white { background: var(--white); color: var(--blue); }
.btn--white:hover { background: var(--blue-light); transform: translateY(-2px); }

/* ---------- About ---------- */
.about { background: var(--gray-bg); }
.about__body { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about__story {
  font-size: 17px;
  color: var(--gray-text);
  line-height: 1.9;
  position: relative;
  padding-left: 24px;
}
.about__story::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 4px;
  background: linear-gradient(to bottom, var(--blue), var(--orange));
  border-radius: 2px;
}
.about__stats { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.stat-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  box-shadow: 0 4px 16px var(--shadow);
  transition: var(--transition);
}
.stat-card:hover { transform: translateY(-4px); box-shadow: 0 8px 32px rgba(26,111,196,0.18); }
.stat-card__num { display: block; font-size: 44px; font-weight: 700; color: var(--blue); line-height: 1; }
.stat-card__plus { font-size: 28px; }
.stat-card__label { display: block; font-size: 14px; color: var(--gray-text); margin-top: 6px; }

/* ---------- Courses ---------- */
.courses { background: var(--white); }
.courses__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 28px; }
.course-card {
  background: var(--gray-bg);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: var(--transition);
  border: 2px solid transparent;
}
.course-card:hover {
  border-color: var(--blue);
  transform: translateY(-6px);
  box-shadow: 0 12px 40px var(--shadow);
}
.course-card__icon { font-size: 44px; margin-bottom: 16px; }
.course-card__title { font-size: 20px; font-weight: 700; color: var(--blue-dark); margin-bottom: 8px; }
.course-card__age {
  display: inline-block;
  background: var(--blue-light);
  color: var(--blue);
  font-size: 13px;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 50px;
  margin-bottom: 14px;
}
.course-card__desc { font-size: 15px; color: var(--gray-text); line-height: 1.8; }

/* ---------- Teachers ---------- */
.teachers { background: var(--gray-bg); }
.teachers__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 28px; }
.teacher-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 28px 20px 24px;
  text-align: center;
  box-shadow: 0 4px 16px var(--shadow);
  transition: var(--transition);
}
.teacher-card:hover { transform: translateY(-6px); box-shadow: 0 12px 36px rgba(26,111,196,0.18); }
.teacher-card__photo {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--blue-light), #d0e4f9);
  border: 3px solid var(--blue-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
}
.teacher-card__photo::after { content: '👩‍🏫'; }
.teacher-card__photo--1::after { content: '👩‍🏫'; }
.teacher-card__photo--2::after { content: '👨‍🏫'; }
.teacher-card__photo--3::after { content: '👩‍🏫'; }
.teacher-card__photo--4::after { content: '👨‍🏫'; }
.teacher-card__photo--5::after { content: '👩‍🏫'; }
.teacher-card__photo--6::after { content: '🧑‍🏫'; }
.teacher-card__name { font-size: 17px; font-weight: 700; color: var(--blue-dark); margin-bottom: 4px; }
.teacher-card__exp { display: inline-block; background: var(--orange-light); color: var(--orange); font-size: 12px; font-weight: 600; padding: 3px 12px; border-radius: 50px; margin-bottom: 10px; }
.teacher-card__spec { font-size: 13px; color: var(--gray-text); line-height: 1.5; }

/* ---------- Results ---------- */
.results { background: var(--white); }
.results__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 28px; }
.result-card {
  background: var(--gray-bg);
  border-radius: var(--radius);
  padding: 32px 28px;
  position: relative;
  transition: var(--transition);
  border: 2px solid transparent;
}
.result-card:hover { border-color: var(--blue); transform: translateY(-4px); }
.result-card__quote {
  font-size: 72px;
  line-height: 1;
  color: var(--blue-light);
  font-family: Georgia, serif;
  position: absolute;
  top: 8px; left: 20px;
}
.result-card__text { font-size: 15px; color: var(--gray-text); line-height: 1.85; margin-bottom: 22px; position: relative; z-index: 1; }
.result-card__info { display: flex; align-items: center; gap: 14px; }
.result-card__avatar {
  width: 48px; height: 48px;
  border-radius: 50%;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--blue-light), #c0d8f5);
  display: flex; align-items: center; justify-content: center;
  font-size: 22px;
}
.result-card__avatar--1::after { content: '🧒'; }
.result-card__avatar--2::after { content: '👧'; }
.result-card__avatar--3::after { content: '👩'; }
.result-card__avatar--4::after { content: '👦'; }
.result-card__name { display: block; font-size: 15px; font-weight: 600; color: #333; }
.result-card__detail { display: block; font-size: 13px; color: var(--gray-text); }

/* ---------- Campus ---------- */
.campus { background: var(--gray-bg); }
.campus__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 32px; }
.campus-card { background: var(--white); border-radius: var(--radius); overflow: hidden; box-shadow: 0 4px 20px var(--shadow); transition: var(--transition); }
.campus-card:hover { transform: translateY(-6px); box-shadow: 0 12px 40px rgba(26,111,196,0.18); }
.campus-card__img { height: 220px; background: linear-gradient(135deg, #d0e4f9, var(--blue-light)); display: flex; align-items: center; justify-content: center; font-size: 56px; }
.campus-card__img--1::after { content: '🏫'; }
.campus-card__img--2::after { content: '🏢'; }
.campus-card__img--3::after { content: '📚'; }
.campus-card__info { padding: 24px; }
.campus-card__name { font-size: 18px; font-weight: 700; color: var(--blue-dark); margin-bottom: 10px; }
.campus-card__address { font-size: 14px; color: var(--gray-text); margin-bottom: 6px; line-height: 1.6; }
.campus-card__tel { font-size: 14px; color: var(--blue); font-weight: 500; }

/* ---------- CTA Banner ---------- */
.cta-banner {
  background: linear-gradient(135deg, var(--blue) 0%, #1e82d4 50%, var(--blue-dark) 100%);
  padding: 80px 0;
  text-align: center;
  color: var(--white);
}
.cta-banner__title { font-size: clamp(24px, 4vw, 38px); font-weight: 700; margin-bottom: 14px; }
.cta-banner__sub { font-size: 17px; opacity: 0.88; margin-bottom: 36px; }

/* ---------- Footer ---------- */
.footer {
  background: #1a2b3c;
  color: rgba(255,255,255,0.75);
  padding: 64px 0 0;
}
.footer__top { display: grid; grid-template-columns: 280px 1fr; gap: 60px; padding-bottom: 48px; border-bottom: 1px solid rgba(255,255,255,0.1); }
.footer__logo { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.footer__logo-icon { font-size: 28px; }
.footer__logo-icon img { height: 36px; width: auto; object-fit: contain; border-radius: 4px; }
.footer__logo-text { font-size: 22px; font-weight: 700; color: var(--white); }
.footer__tagline { font-size: 15px; opacity: 0.7; }
.footer__cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.footer__col h5 { color: var(--white); font-size: 15px; font-weight: 600; margin-bottom: 16px; }
.footer__col p { font-size: 14px; line-height: 2; opacity: 0.75; }
.footer__qr-box {
  width: 100px; height: 100px;
  background: rgba(255,255,255,0.1);
  border: 1px dashed rgba(255,255,255,0.3);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: 12px;
  line-height: 1.5;
  color: rgba(255,255,255,0.5);
}
.footer__bottom { padding: 24px 0; text-align: center; font-size: 13px; opacity: 0.5; }
.footer__stats { margin-bottom: 12px; font-size: 14px; opacity: 1; color: var(--gray-text); }
.footer__stat-item { margin: 0 6px; }
.footer__stat-num { font-weight: 700; color: var(--blue); }
.footer__stat-sep { margin: 0 8px; opacity: 0.4; }

/* ---------- 动画 ---------- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(32px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(8px); }
}

/* 滚动淡入 */
.reveal { opacity: 0; transform: translateY(40px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .about__body { grid-template-columns: 1fr; gap: 40px; }
  .footer__top { grid-template-columns: 1fr; gap: 40px; }
  .footer__cols { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  :root { --header-h: 60px; }
  .nav {
    position: fixed;
    top: var(--header-h); left: 0; right: 0;
    background: var(--white);
    flex-direction: column;
    gap: 0;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 24px var(--shadow);
    transform: translateY(-120%);
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
  }
  .nav.open { transform: translateY(0); opacity: 1; pointer-events: all; }
  .nav__link { width: 100%; padding: 14px 28px; font-size: 16px; }
  .nav__link--cta { text-align: center; margin: 8px 28px 0; }
  .hamburger { display: flex; }
  .hero { min-height: 540px; }
  .about__stats { grid-template-columns: 1fr 1fr; }
  .footer__cols { grid-template-columns: 1fr; }
  .section { padding: 64px 0; }
  .teachers__grid { grid-template-columns: repeat(2, 1fr); }
  .results__grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero__btns { flex-direction: column; align-items: center; }
  .btn { width: 100%; max-width: 260px; text-align: center; }
  .about__stats { grid-template-columns: 1fr 1fr; gap: 12px; }
  .stat-card { padding: 20px 12px; }
  .stat-card__num { font-size: 36px; }
  .teachers__grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .courses__grid { grid-template-columns: 1fr; }
  .campus__grid { grid-template-columns: 1fr; }
  .modal { border-radius: 12px 12px 0 0; max-height: 85vh; align-self: flex-end; }
  .modal-overlay { align-items: flex-end; padding: 0; }
  .modal__header { padding: 18px 20px 0; }
  .modal__body { padding: 16px 20px 24px; }
}

/* ---------- 预约试课弹窗 ---------- */
.btn-book-trial {
  font-size: 15px;
  font-weight: 600;
  padding: 8px 20px;
  border-radius: 50px;
  border: 2px solid var(--orange);
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  background: var(--orange);
  color: var(--white);
  font-family: inherit;
}
.btn-book-trial:hover { background: #e8951a; border-color: #e8951a; }

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}
.modal {
  background: var(--white);
  border-radius: 16px;
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
  transform: translateY(20px) scale(0.96);
  transition: transform 0.3s ease;
}
.modal-overlay.active .modal {
  transform: translateY(0) scale(1);
}
.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 28px 0;
}
.modal__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--blue-dark);
}
.modal__close {
  background: none;
  border: none;
  font-size: 28px;
  color: var(--gray-light);
  cursor: pointer;
  line-height: 1;
  transition: color 0.2s;
  padding: 0;
}
.modal__close:hover { color: #333; }
.modal__body {
  padding: 20px 28px 28px;
}
.modal__intro {
  font-size: 14px;
  color: var(--gray-text);
  margin-bottom: 20px;
  background: var(--blue-light);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  line-height: 1.6;
}
.form-group {
  margin-bottom: 16px;
}
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: #333;
  margin-bottom: 6px;
}
.form-group .required {
  color: #e74c3c;
  margin-left: 2px;
}
.form-group .optional {
  font-weight: 400;
  color: var(--gray-light);
  font-size: 12px;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: inherit;
  color: #333;
  background: var(--white);
  transition: border-color 0.2s;
  appearance: none;
  -webkit-appearance: none;
}
.form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23555' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(26, 111, 196, 0.12);
}
.form-group input.error,
.form-group select.error,
.form-group textarea.error {
  border-color: #e74c3c;
}
.form-group textarea {
  resize: vertical;
  min-height: 80px;
}
.form-error {
  color: #e74c3c;
  font-size: 13px;
  margin-bottom: 12px;
  min-height: 18px;
}
.modal__submit {
  width: 100%;
  text-align: center;
  padding: 14px;
  font-size: 16px;
  margin-top: 4px;
}
.modal__success,
.modal__fail {
  display: none;
  text-align: center;
  padding: 24px 0 8px;
}
.modal__success.show,
.modal__fail.show {
  display: block;
}
.success-icon {
  width: 56px;
  height: 56px;
  background: #27ae60;
  color: white;
  border-radius: 50%;
  font-size: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-weight: 700;
}
.fail-icon {
  width: 56px;
  height: 56px;
  background: #e74c3c;
  color: white;
  border-radius: 50%;
  font-size: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-weight: 700;
}
.modal__success h4 {
  font-size: 20px;
  font-weight: 700;
  color: #27ae60;
  margin-bottom: 8px;
}
.modal__fail h4 {
  font-size: 20px;
  font-weight: 700;
  color: #e74c3c;
  margin-bottom: 8px;
}
.modal__success p,
.modal__fail p {
  font-size: 15px;
  color: var(--gray-text);
  line-height: 1.6;
}
.modal__fail .btn {
  margin-top: 16px;
}