/* SouEdu – Custom Styles */

:root {
  --primary: #1a73e8;
  --primary-dark: #1557b0;
  --secondary: #34a853;
  --accent: #fbbc04;
  --danger: #ea4335;
  --bg: #f8f9fa;
  --text: #202124;
  --muted: #5f6368;
  --card-shadow: 0 2px 8px rgba(0,0,0,.12);
}

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

body {
  margin: 0;
  font-family: 'Segoe UI', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; }

/* ── Header / Navbar ── */
header {
  background: var(--primary);
  color: #fff;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .5rem;
  min-height: 56px;
  box-shadow: 0 2px 6px rgba(0,0,0,.2);
}

header .brand {
  font-size: 1.4rem;
  font-weight: 700;
  color: #fff;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: .4rem;
}

header .brand span { font-weight: 300; }

nav { display: flex; gap: .25rem; flex-wrap: wrap; }

nav a {
  color: rgba(255,255,255,.9);
  padding: .5rem .9rem;
  border-radius: 4px;
  font-size: .95rem;
  transition: background .2s;
}

nav a:hover,
nav a.active {
  background: rgba(255,255,255,.2);
  text-decoration: none;
  color: #fff;
}

/* ── Hero Banner ── */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  text-align: center;
  padding: 4rem 1.5rem 3.5rem;
}

.hero h1 {
  font-size: clamp(1.8rem, 5vw, 3rem);
  margin: 0 0 1rem;
}

.hero p {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  max-width: 680px;
  margin: 0 auto 2rem;
  opacity: .9;
}

.btn {
  display: inline-block;
  padding: .75rem 1.75rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background .2s, color .2s, border-color .2s;
}

.btn-light {
  background: #fff;
  color: var(--primary);
}

.btn-light:hover {
  background: #e8f0fe;
  text-decoration: none;
}

.btn-outline-light {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,.7);
}

.btn-outline-light:hover {
  background: rgba(255,255,255,.15);
  text-decoration: none;
}

/* ── Layout ── */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

main { padding: 3rem 1.5rem; }

/* ── Cards ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.card {
  background: #fff;
  border-radius: 10px;
  padding: 2rem 1.5rem;
  box-shadow: var(--card-shadow);
  text-align: center;
  transition: transform .2s, box-shadow .2s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0,0,0,.15);
}

.card .icon {
  font-size: 3rem;
  margin-bottom: .75rem;
  display: block;
}

.card h2 {
  font-size: 1.2rem;
  margin: 0 0 .75rem;
  color: var(--primary);
}

.card p { color: var(--muted); margin: 0 0 1.25rem; font-size: .95rem; }

/* ── Info Sections ── */
.section { margin-bottom: 2.5rem; }

.section h2 {
  font-size: 1.5rem;
  color: var(--primary);
  border-bottom: 3px solid var(--accent);
  padding-bottom: .35rem;
  margin-bottom: 1rem;
}

/* ── Tips List ── */
.tips { list-style: none; padding: 0; margin: 0; }

.tips li {
  background: #fff;
  border-left: 4px solid var(--primary);
  margin-bottom: 1rem;
  padding: 1rem 1.25rem;
  border-radius: 0 6px 6px 0;
  box-shadow: var(--card-shadow);
}

.tips li strong { display: block; margin-bottom: .25rem; color: var(--text); }

.tips.green li  { border-left-color: var(--secondary); }
.tips.amber li  { border-left-color: var(--accent); }
.tips.red   li  { border-left-color: var(--danger); }

/* ── Alert Box ── */
.alert {
  padding: 1rem 1.25rem;
  border-radius: 6px;
  margin-bottom: 1.5rem;
  font-size: .95rem;
}

.alert-info    { background: #e8f0fe; border-left: 4px solid var(--primary); color: #174ea6; }
.alert-warning { background: #fef9e7; border-left: 4px solid var(--accent);  color: #7a5c00; }
.alert-success { background: #e6f4ea; border-left: 4px solid var(--secondary); color: #1e5631; }

/* ── Footer ── */
footer {
  background: #202124;
  color: rgba(255,255,255,.7);
  text-align: center;
  padding: 2rem 1.5rem;
  font-size: .9rem;
}

footer a { color: rgba(255,255,255,.85); }
footer a:hover { color: #fff; }

/* ── Responsive ── */
@media (max-width: 600px) {
  header { flex-direction: column; align-items: flex-start; padding: .75rem 1rem; }
  nav { gap: 0; }
}