/* ── LearnHub — Global Styles ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:      #0a0805;
  --bg2:     #120f0a;
  --bg3:     #1c1711;
  --border:  #2a2218;
  --accent:  #f59e0b;
  --accent2: #ef4444;
  --green:   #10b981;
  --purple:  #8b5cf6;
  --text1:   #faf6ef;
  --text2:   #9d8e78;
  --text3:   #4a3f30;
  --radius:  .5rem;
  --font:    'Inter', system-ui, sans-serif;
}

body { font-family: var(--font); background: var(--bg); color: var(--text1); min-height: 100vh; font-size: 14px; line-height: 1.5; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Nav ── */
nav {
  background: rgba(10,8,5,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-logo {
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--text1);
  display: flex;
  align-items: center;
  gap: .45rem;
}
.logo-dot { color: var(--accent); }
.nav-links { display: flex; gap: 1.75rem; align-items: center; }
.nav-links a { color: var(--text2); font-size: .875rem; font-weight: 500; }
.nav-links a:hover { color: var(--text1); text-decoration: none; }
.nav-cta {
  background: var(--accent);
  color: #0a0805 !important;
  padding: .42rem 1.1rem;
  border-radius: var(--radius);
  font-weight: 800;
  font-size: .825rem;
}
.nav-cta:hover { background: #d97706; text-decoration: none !important; }
.nav-ghost {
  color: var(--text1) !important;
  padding: .4rem .9rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-size: .825rem;
  font-weight: 500;
}
.nav-ghost:hover { border-color: var(--accent); color: var(--accent) !important; text-decoration: none !important; }

/* ── Layout ── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }

/* ── Hero ── */
.hero {
  padding: 5.5rem 0 4rem;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -150px; right: -100px;
  width: 600px; height: 600px;
  background: radial-gradient(ellipse, rgba(245,158,11,.08) 0%, transparent 65%);
  pointer-events: none;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  background: rgba(245,158,11,.1);
  border: 1px solid rgba(245,158,11,.25);
  color: var(--accent);
  font-size: .75rem;
  font-weight: 700;
  padding: .3rem .9rem;
  border-radius: 999px;
  margin-bottom: 1.25rem;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.6rem);
  font-weight: 900;
  letter-spacing: -.04em;
  line-height: 1.1;
  margin-bottom: 1.1rem;
  max-width: 700px;
}
.grad { color: var(--accent); }
.hero p { color: var(--text2); font-size: 1.05rem; max-width: 540px; margin-bottom: 2rem; }
.hero-btns { display: flex; gap: 1rem; flex-wrap: wrap; }
.btn-primary {
  background: var(--accent);
  color: #0a0805;
  padding: .75rem 1.85rem;
  border-radius: var(--radius);
  font-weight: 800;
  font-size: .92rem;
  cursor: pointer;
  border: none;
  transition: background .15s, transform .1s;
  font-family: var(--font);
}
.btn-primary:hover { background: #d97706; transform: translateY(-1px); }
.btn-outline {
  background: transparent;
  color: var(--text1);
  padding: .75rem 1.85rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: .92rem;
  cursor: pointer;
  border: 1px solid var(--border);
  transition: border-color .15s, color .15s;
  font-family: var(--font);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

/* ── Search bar ── */
.search-wrap {
  margin-top: 2.5rem;
  display: flex;
  gap: 0;
  max-width: 520px;
}
.search-input {
  flex: 1;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-right: none;
  border-radius: var(--radius) 0 0 var(--radius);
  color: var(--text1);
  padding: .75rem 1rem;
  font-size: .88rem;
  outline: none;
  font-family: var(--font);
}
.search-input:focus { border-color: var(--accent); }
.search-btn {
  background: var(--accent);
  color: #0a0805;
  padding: .75rem 1.25rem;
  border: none;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-weight: 700;
  font-size: .88rem;
  cursor: pointer;
  font-family: var(--font);
}

/* ── Section ── */
.section { padding: 5rem 0; }
.section-label { font-size: .75rem; font-weight: 700; text-transform: uppercase; letter-spacing: .1em; color: var(--accent); margin-bottom: .6rem; }
.section-title { font-size: clamp(1.4rem, 2.8vw, 2.1rem); font-weight: 800; letter-spacing: -.03em; margin-bottom: 1rem; }
.section-sub { color: var(--text2); font-size: .92rem; max-width: 500px; }

/* ── Course card ── */
.course-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: .65rem;
  overflow: hidden;
  cursor: pointer;
  transition: border-color .15s, transform .15s;
}
.course-card:hover { border-color: rgba(245,158,11,.4); transform: translateY(-2px); }
.course-thumb {
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.5rem;
  background: var(--bg3);
  border-bottom: 1px solid var(--border);
}
.course-body { padding: 1.1rem; }
.course-cat { font-size: .68rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--accent); margin-bottom: .4rem; }
.course-title { font-size: .9rem; font-weight: 700; line-height: 1.35; margin-bottom: .5rem; }
.course-author { font-size: .75rem; color: var(--text2); margin-bottom: .65rem; }
.course-meta { display: flex; align-items: center; justify-content: space-between; }
.course-rating { display: flex; align-items: center; gap: .3rem; font-size: .75rem; font-weight: 700; color: var(--accent); }
.stars { font-size: .7rem; }
.course-students { font-size: .73rem; color: var(--text3); }
.course-price { font-size: .9rem; font-weight: 800; }

/* ── Category pill ── */
.cat-grid { display: flex; flex-wrap: wrap; gap: .65rem; margin-top: 1.75rem; }
.cat-pill {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: .45rem 1.1rem;
  font-size: .8rem;
  font-weight: 600;
  color: var(--text2);
  cursor: pointer;
  transition: border-color .15s, color .15s;
}
.cat-pill:hover { border-color: var(--accent); color: var(--accent); }
.cat-pill.active { background: rgba(245,158,11,.1); border-color: var(--accent); color: var(--accent); }

/* ── Stats ── */
.stat-card { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; text-align: center; }
.stat-value { font-size: 2.1rem; font-weight: 900; letter-spacing: -.03em; color: var(--accent); }
.stat-label { font-size: .75rem; font-weight: 600; text-transform: uppercase; letter-spacing: .07em; color: var(--text3); margin-top: .35rem; }

/* ── Instructor card ── */
.instructor-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
}
.instructor-avatar {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: var(--bg3);
  border: 2px solid var(--border);
  margin: 0 auto .85rem;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.75rem;
}
.instructor-name { font-size: .9rem; font-weight: 700; margin-bottom: .2rem; }
.instructor-title { font-size: .75rem; color: var(--text2); margin-bottom: .65rem; }
.instructor-stat { font-size: .73rem; color: var(--text3); }

/* ── Blog card ── */
.blog-card { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.blog-thumb { height: 120px; display: flex; align-items: center; justify-content: center; font-size: 3rem; background: var(--bg3); border-bottom: 1px solid var(--border); }
.blog-body { padding: 1.1rem; }
.blog-tag { font-size: .68rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--accent); margin-bottom: .4rem; }
.blog-title { font-size: .88rem; font-weight: 700; line-height: 1.4; margin-bottom: .5rem; }
.blog-meta { font-size: .72rem; color: var(--text3); }

/* ── Live pill ── */
.live-pill {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  background: rgba(239,68,68,.1);
  border: 1px solid rgba(239,68,68,.25);
  border-radius: 999px;
  padding: .3rem .85rem;
  font-size: .75rem;
  font-weight: 700;
  color: var(--accent2);
}
.live-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent2); animation: pulse 1.2s infinite; }
@keyframes pulse { 0%,100% { opacity:1; } 50% { opacity:.3; } }

/* ── Badge ── */
.badge { display: inline-flex; align-items: center; gap: .3rem; padding: .2rem .6rem; border-radius: 999px; font-size: .7rem; font-weight: 700; }
.badge-amber  { background: rgba(245,158,11,.12); color: var(--accent); }
.badge-green  { background: rgba(16,185,129,.12); color: var(--green); }
.badge-purple { background: rgba(139,92,246,.12); color: var(--purple); }

/* ── Footer ── */
footer { background: var(--bg2); border-top: 1px solid var(--border); padding: 4rem 2rem 2.5rem; margin-top: 4rem; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2.5rem; max-width: 1200px; margin: 0 auto 3rem; }
.footer-brand { font-size: .85rem; color: var(--text2); line-height: 1.65; margin-top: .75rem; }
.footer-col h4 { font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--text3); margin-bottom: 1rem; }
.footer-col a { display: block; font-size: .83rem; color: var(--text2); margin-bottom: .55rem; }
.footer-col a:hover { color: var(--text1); text-decoration: none; }
.footer-bottom { max-width: 1200px; margin: 0 auto; padding-top: 1.5rem; border-top: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; font-size: .75rem; color: var(--text3); flex-wrap: wrap; gap: .5rem; }

/* ── Login ── */
.login-page { min-height: 100vh; display: flex; }
.login-left {
  flex: 1;
  background: var(--bg2);
  border-right: 1px solid var(--border);
  padding: 3rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.login-right {
  flex: 1.1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem;
  background: var(--bg);
}
.login-box { width: 100%; max-width: 400px; }
.login-title { font-size: 1.5rem; font-weight: 800; margin-bottom: .4rem; }
.login-sub { color: var(--text2); font-size: .875rem; margin-bottom: 2rem; }
.form-label { font-size: .78rem; font-weight: 600; color: var(--text2); display: block; margin-bottom: .35rem; }
.form-input { width: 100%; background: var(--bg3); border: 1px solid var(--border); border-radius: var(--radius); color: var(--text1); padding: .65rem .9rem; font-size: .88rem; outline: none; transition: border-color .15s; font-family: var(--font); }
.form-input:focus { border-color: var(--accent); }
.form-group { margin-bottom: 1.1rem; }
.login-submit { width: 100%; padding: .75rem; font-size: .95rem; margin-top: .25rem; }
.login-err { display: none; background: rgba(239,68,68,.1); border: 1px solid rgba(239,68,68,.3); border-radius: var(--radius); color: var(--accent2); font-size: .82rem; padding: .6rem .9rem; margin-bottom: 1rem; }
.divider { display: flex; align-items: center; gap: .75rem; margin: 1.25rem 0; color: var(--text3); font-size: .75rem; }
.divider::before, .divider::after { content: ''; flex: 1; height: 1px; background: var(--border); }

/* ── 404 ── */
.not-found { min-height: calc(100vh - 60px); display: flex; align-items: center; justify-content: center; text-align: center; padding: 2rem; }
.not-found h1 { font-size: clamp(5rem, 15vw, 10rem); font-weight: 900; color: var(--accent); letter-spacing: -.05em; line-height: 1; }

/* ── Responsive ── */
@media (max-width: 900px) {
  .login-left { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 700px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .nav-links .hide-sm { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
}