/* ============================================================
   Common Styles — Jinsi Group / 浸思研学
   Shared across all pages: reset, variables, nav, footer, buttons, modals
   ============================================================ */

/* ─── Reset & Variables ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --green: #2d6a4f; --green-light: #40916c; --green-dark: #1b4332;
  --green-pale: #e8f0e9; --gold: #b8860b; --gold-light: #f5e6c8;
  --cream: #faf7f2; --cream-dark: #f0ece5;
  --text: #1a1a2e; --text-mid: #4a4a5a; --text-light: #6b6b7a;
  --white: #fff; --radius: 10px; --radius-lg: 20px;
}
html { scroll-behavior: smooth; }
body {
  font-family: 'DM Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--text); background: var(--cream); line-height: 1.75;
  overflow-x: hidden;
}
h1, h2, h3, h4 {
  font-family: 'Noto Serif SC', serif; font-weight: 700; line-height: 1.25;
  letter-spacing: -0.01em;
}
a { text-decoration: none; color: inherit; }

/* ─── Layout ─── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 28px; }
.section { padding: clamp(60px, 10vw, 120px) 0; }
.section-compact { padding: clamp(40px, 6vw, 80px) 0; }
.section-title {
  font-size: clamp(1.5rem, 4vw, 2.4rem); margin-bottom: 12px;
  color: var(--green);
}
.section-subtitle {
  color: var(--text-mid); font-size: 1.05rem; margin-bottom: 48px;
  letter-spacing: 0.3px; max-width: 600px;
}

/* ─── Navigation ─── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: var(--cream); border-bottom: 1px solid rgba(0,0,0,0.05);
}
nav .container {
  display: flex; align-items: center; justify-content: space-between; height: 68px;
}
.nav-links { display: flex; gap: 20px; align-items: center; }
.nav-links a {
  font-size: 0.88rem; font-weight: 500; color: var(--text-mid);
  transition: color 0.2s; position: relative; padding: 4px 0;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: 0; left: 0; width: 0;
  height: 2px; background: var(--green); transition: width 0.3s;
}
.nav-links a:hover { color: var(--green); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-links a.active { color: var(--green); font-weight: 600; }
.nav-cta {
  background: var(--green); color: var(--white) !important;
  padding: 8px 18px; border-radius: 6px; font-weight: 600 !important;
}
.nav-cta::after { display: none !important; }
.nav-cta:hover { background: var(--green-light) !important; color: var(--white) !important; }
.nav-toggle {
  display: none; background: none; border: none; font-size: 1.5rem;
  cursor: pointer; color: var(--green);
}
/* Dropdown */
.dropdown { position: relative; }
.dropdown-menu {
  display: none; position: absolute; top: 100%; left: 50%;
  transform: translateX(-50%); background: var(--white);
  border-radius: 8px; box-shadow: 0 8px 32px rgba(0,0,0,0.1);
  padding: 8px 0; min-width: 140px; z-index: 100;
}
.dropdown-menu a {
  display: block; padding: 8px 20px; font-size: .85rem;
  color: var(--text-mid); white-space: nowrap;
}
.dropdown-menu a:hover { background: var(--green-pale); color: var(--green); }
.dropdown:hover .dropdown-menu { display: block; }

/* ─── Buttons ─── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 32px; border-radius: 6px; font-weight: 600;
  font-size: 0.93rem; transition: all 0.25s; cursor: pointer; border: none;
  font-family: inherit;
}
.btn-primary { background: var(--green); color: var(--white); }
.btn-primary:hover { background: var(--green-dark); transform: translateY(-2px); }
.btn-outline {
  background: transparent; color: var(--green);
  border: 1.5px solid var(--green);
}
.btn-outline:hover { background: var(--green); color: var(--white); transform: translateY(-2px); }
.btn-white {
  background: var(--white); color: var(--green);
  padding: 14px 40px; border-radius: 6px; font-weight: 700;
  font-size: 0.95rem; display: inline-block; transition: all 0.25s;
}
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.15); }

/* ─── CTA Block ─── */
.cta-block {
  background: var(--green); color: var(--white); text-align: center;
  padding: clamp(60px, 10vw, 100px) 0;
}
.cta-block h2 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); margin-bottom: 12px; }
.cta-block p { font-size: 1rem; opacity: 0.8; margin-bottom: 32px; }

/* ─── Footer ─── */
footer {
  background: #1a1a2e; color: rgba(255,255,255,0.65);
  padding: 56px 0 0; font-size: 0.85rem;
}
footer .container {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
}
footer h4 { color: var(--white); font-size: 0.95rem; margin-bottom: 16px; font-family: 'Noto Serif SC',serif; }
footer p { line-height: 2.2; }
footer a { color: rgba(255,255,255,0.65); }
footer a:hover { color: var(--gold); }
footer .copyright {
  grid-column: 1 / -1; text-align: center; padding: 28px 0; margin-top: 40px;
  border-top: 1px solid rgba(255,255,255,0.08); font-size: 0.78rem;
}

/* ─── Breadcrumb ─── */
.breadcrumb {
  padding: 12px 0; margin-bottom: 0;
  font-size: 0.85rem; color: var(--text-light);
}
.breadcrumb a {
  color: var(--text-light); text-decoration: none;
  transition: color 0.2s;
}
.breadcrumb a:hover { color: var(--green); }
.breadcrumb span { color: var(--text-mid); }

/* ─── Partners Tags ─── */
.partner-tags {
  display: flex; justify-content: center; flex-wrap: wrap;
  gap: 12px; max-width: 700px; margin: 0 auto;
}
.partner-tag {
  background: var(--cream-dark); padding: 8px 22px; border-radius: 6px;
  font-size: 0.9rem; font-weight: 500; color: var(--text-mid);
  transition: all 0.2s;
}
.partner-tag:hover { background: var(--green-pale); color: var(--green); }

/* ─── Features Grid ─── */
.features-row {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  background: var(--green-pale);
}
.feat-cell {
  background: var(--cream); padding: 48px 36px; text-align: left;
}
.feat-cell:first-child { padding-left: 0; }
.feat-cell .feat-num {
  font-size: 2.4rem; color: var(--green);
  margin-bottom: 8px; line-height: 1;
}
.feat-cell h3 { font-size: 1.05rem; margin-bottom: 8px; }
.feat-cell p { font-size: 0.85rem; color: var(--text-light); line-height: 1.7; }

/* ─── Stats Strip ─── */
.stats-strip {
  background: var(--green-dark); color: var(--cream);
  padding: clamp(48px, 6vw, 80px) 0;
}
.stats-strip .container {
  display: flex; justify-content: space-around; text-align: center;
  flex-wrap: wrap; gap: 24px;
}
.stat-item { flex: 1; min-width: 120px; }
.stat-num { font-size: clamp(1.6rem, 4vw, 2.8rem); font-weight: 800; line-height: 1; }
.stat-label {
  font-size: 0.8rem; opacity: 0.7; margin-top: 6px;
  letter-spacing: 1px;
}

/* ─── Modal ─── */
.modal-overlay {
  display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.45); z-index: 2000;
  align-items: center; justify-content: center;
}
.modal-overlay.show { display: flex; }
.modal {
  background: var(--white); border-radius: 12px; padding: 44px 36px;
  max-width: 500px; width: 90%; position: relative; max-height: 90vh;
  overflow-y: auto;
}
.modal-close {
  position: absolute; top: 14px; right: 18px; background: none;
  border: none; font-size: 1.4rem; cursor: pointer; color: #999;
}
.modal h2 { font-size: 1.5rem; margin-bottom: 6px; }
.modal p { color: var(--text-light); margin-bottom: 24px; font-size: 0.9rem; }
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block; font-size: 0.85rem; font-weight: 500;
  margin-bottom: 5px; color: var(--text-mid);
}
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 11px 14px; border: 1.5px solid #e0e0e0;
  border-radius: 6px; font-size: 0.9rem; font-family: inherit;
  transition: border-color 0.2s; background: var(--cream);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--green); background: var(--white);
}
.form-group textarea { resize: vertical; min-height: 80px; }
.form-submit {
  width: 100%; padding: 13px; background: var(--green); color: var(--white);
  border: none; border-radius: 6px; font-size: 0.95rem; font-weight: 600;
  cursor: pointer; transition: background 0.2s; font-family: inherit;
}
.form-submit:hover { background: var(--green-dark); }

/* ─── Page Hero (shared for sub-pages) ─── */
.page-hero {
  background: var(--green-dark); color: var(--white);
  padding: clamp(100px, 16vw, 160px) 0 60px;
}
.page-hero h1 { font-size: clamp(1.8rem, 4.5vw, 3rem); }
.page-hero p { font-size: 1.05rem; opacity: 0.8; max-width: 600px; margin-top: 12px; }

/* ─── Responsive Media Queries ─── */
@media (max-width: 1024px) {
  .features-row { grid-template-columns: repeat(2, 1fr); }
  footer .container { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 768px) {
  nav .container { height: 56px; }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column; position: absolute;
    top: 56px; left: 0; right: 0; background: var(--cream);
    padding: 16px 24px; border-bottom: 1px solid rgba(0,0,0,0.05);
    gap: 12px;
  }
  .nav-toggle { display: block; }
  .dropdown-menu { position: static; box-shadow: none; padding: 0 0 0 16px; }
  .container { padding: 0 20px; }
  .section { padding: 60px 0; }
  .section-title { font-size: 1.4rem; }
  .section-subtitle { font-size: 0.9rem; margin-bottom: 32px; }
  .features-row { grid-template-columns: 1fr 1fr; gap: 0; }
  .feat-cell { padding: 28px 20px; }
  .feat-cell .feat-num { font-size: 1.8rem; }
  .stats-strip .container { flex-direction: column; gap: 16px; }
  .stat-num { font-size: 2rem; }
  .btn { padding: 12px 24px; font-size: 0.88rem; }
  footer { padding: 40px 0 0; }
  footer .container { grid-template-columns: 1fr 1fr; gap: 28px; }
  footer .copyright { margin-top: 28px; padding-top: 20px; }
  .breadcrumb { font-size: 0.82rem; }
  .partner-tags { gap: 8px; }
  .partner-tag { padding: 6px 16px; font-size: 0.8rem; }
  .modal { padding: 24px 20px; max-width: 100%; border-radius: 12px 12px 0 0; }
  .modal-overlay { align-items: flex-end; }
  .modal h2 { font-size: 1.3rem; }
  .form-submit { padding: 14px; font-size: 1rem; }
  .page-hero { padding: 80px 0 40px; }
}
@media (max-width: 480px) {
  .features-row { grid-template-columns: 1fr; }
  footer .container { grid-template-columns: 1fr; }
  .container { padding: 0 16px; }
  .section-title { font-size: 1.3rem; }
}