/* ============================================================
   EduConnect — Main Stylesheet
   Mobile-first, EdTech Blue/Green theme
   ============================================================ */

:root {
  --primary:      #2563EB;
  --primary-dark: #1D4ED8;
  --primary-light:#EFF6FF;
  --secondary:    #059669;
  --secondary-light:#ECFDF5;
  --accent:       #F59E0B;
  --text:         #0F172A;
  --text-muted:   #64748B;
  --border:       #E2E8F0;
  --bg:           #FFFFFF;
  --bg-light:     #F8FAFC;
  --radius:       12px;
  --radius-lg:    20px;
  --shadow:       0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.06);
  --shadow-md:    0 4px 24px rgba(0,0,0,.12);
  --transition:   .2s ease;
  --font:         'Plus Jakarta Sans', system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { opacity: .85; }
img { max-width: 100%; height: auto; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 72px 0; }
.bg-light { background: var(--bg-light); }

/* ── TEXT UTILITIES ────────────────────────────────────── */
.text-gradient {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}

/* ── BUTTONS ────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 6px; padding: 10px 22px; border-radius: 8px;
  font-family: var(--font); font-size: 14px; font-weight: 600;
  border: 2px solid transparent; cursor: pointer;
  transition: all var(--transition); white-space: nowrap;
}
.btn-primary   { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: #fff; transform: translateY(-1px); }
.btn-outline   { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: var(--primary-light); }
.btn-secondary { background: var(--secondary); color: #fff; border-color: var(--secondary); }
.btn-white     { background: #fff; color: var(--primary); border-color: #fff; }
.btn-white:hover { background: var(--primary-light); color: var(--primary); }
.btn-outline-white { background: transparent; color: #fff; border-color: #fff; }
.btn-outline-white:hover { background: rgba(255,255,255,.15); }
.btn-lg  { padding: 14px 32px; font-size: 16px; border-radius: 10px; }
.btn-sm  { padding: 7px 16px; font-size: 13px; }
.btn-danger { background: #DC2626; color: #fff; border-color: #DC2626; }

/* ── NAVBAR ─────────────────────────────────────────────── */
.navbar {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
  transition: box-shadow var(--transition);
}
.navbar.scrolled { box-shadow: var(--shadow); }
.nav-container { max-width: 1200px; margin: 0 auto; padding: 0 20px;
  display: flex; align-items: center; gap: 24px; }
.nav-logo { display: flex; align-items: center; gap: 8px; font-size: 20px;
  color: var(--text); font-weight: 700; flex-shrink: 0; }
.logo-icon { font-size: 24px; }
.logo-text strong { color: var(--primary); }
.nav-links { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.nav-links a { font-size: 14px; font-weight: 500; color: var(--text-muted); padding: 6px 12px;
  border-radius: 6px; transition: all var(--transition); }
.nav-links a:hover { color: var(--primary); background: var(--primary-light); }
.nav-toggle { display: none; background: none; border: none; font-size: 22px; cursor: pointer; }

/* ── HERO ────────────────────────────────────────────────── */
.hero {
  padding: 80px 0 60px; position: relative; overflow: hidden;
  background: linear-gradient(135deg, #EFF6FF 0%, #ECFDF5 50%, #FFFBEB 100%);
}
.hero-bg-shapes { position: absolute; inset: 0; pointer-events: none; }
.shape { position: absolute; border-radius: 50%; opacity: .08; }
.shape-1 { width: 500px; height: 500px; background: var(--primary); top: -200px; right: -100px; }
.shape-2 { width: 300px; height: 300px; background: var(--secondary); bottom: -100px; left: -50px; }
.shape-3 { width: 200px; height: 200px; background: var(--accent); top: 50%; right: 20%; }
.hero .container { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: #fff; border: 1px solid var(--border);
  padding: 8px 16px; border-radius: 100px;
  font-size: 13px; font-weight: 600; color: var(--text-muted);
  margin-bottom: 20px; box-shadow: var(--shadow);
}
.hero-content h1 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; line-height: 1.15;
  letter-spacing: -1px; margin-bottom: 16px; }
.hero-sub { font-size: 17px; color: var(--text-muted); margin-bottom: 28px; max-width: 520px; }

.search-bar {
  display: flex; gap: 8px; flex-wrap: wrap;
  background: #fff; padding: 8px; border-radius: 14px;
  box-shadow: var(--shadow-md); margin-bottom: 20px;
}
.search-select {
  flex: 1; min-width: 140px; padding: 10px 14px; border: none;
  border-radius: 8px; font-family: var(--font); font-size: 14px;
  background: var(--bg-light); color: var(--text); cursor: pointer; outline: none;
}
.btn-search { padding: 10px 24px; flex-shrink: 0; }

.hero-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-pill {
  background: #fff; border: 1px solid var(--border);
  padding: 6px 14px; border-radius: 100px; font-size: 13px; font-weight: 500;
  color: var(--text-muted); transition: all var(--transition);
}
.tag-pill:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

.hero-visual { position: relative; }
.hero-card {
  background: #fff; border-radius: var(--radius-lg); padding: 20px;
  box-shadow: var(--shadow-md);
  display: flex; align-items: center; gap: 16px;
  margin-bottom: 24px;
}
.hc-avatar { width: 56px; height: 56px; border-radius: 50%; background: #EFF6FF;
  display: flex; align-items: center; justify-content: center; font-size: 28px; flex-shrink: 0; }
.hc-sub { font-size: 13px; color: var(--text-muted); }
.hc-stars { font-size: 13px; color: var(--accent); }
.hc-stars span { color: var(--text-muted); }
.hero-stat-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.hero-stat {
  background: #fff; border-radius: var(--radius); padding: 16px;
  text-align: center; box-shadow: var(--shadow); font-size: 13px; color: var(--text-muted);
}
.hs-num { font-size: 24px; font-weight: 800; color: var(--primary); }
.floating { animation: float 3s ease-in-out infinite; }
@keyframes float { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-8px)} }

/* ── SECTION HEADER ─────────────────────────────────────── */
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 { font-size: clamp(1.75rem, 3vw, 2.25rem); font-weight: 800; margin-bottom: 8px; }
.section-header p  { color: var(--text-muted); font-size: 16px; max-width: 520px; margin: 0 auto 16px; }

/* ── SUBJECTS GRID ───────────────────────────────────────── */
.subjects-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 16px; }
.subject-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px 16px; text-align: center; text-decoration: none; color: var(--text);
  transition: all var(--transition); cursor: pointer;
}
.subject-card:hover {
  border-color: var(--card-color, var(--primary));
  box-shadow: 0 4px 20px rgba(0,0,0,.1); transform: translateY(-3px);
}
.subject-card:hover .subject-name { color: var(--card-color); }
.subject-icon { font-size: 32px; margin-bottom: 10px; }
.subject-name { font-weight: 700; font-size: 14px; margin-bottom: 4px; }
.subject-count { font-size: 12px; color: var(--text-muted); }

/* ── HOW IT WORKS ────────────────────────────────────────── */
.steps-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px; }
.step-card {
  background: #fff; border-radius: var(--radius-lg); padding: 32px; text-align: center;
  box-shadow: var(--shadow); position: relative;
}
.step-num {
  position: absolute; top: 20px; right: 20px; font-size: 48px; font-weight: 900;
  color: var(--primary-light); line-height: 1;
}
.step-icon { font-size: 40px; margin-bottom: 16px; }
.step-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.step-card p  { color: var(--text-muted); font-size: 14px; }

/* ── TEACHERS GRID ───────────────────────────────────────── */
.teachers-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px; }
.teacher-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg);
  overflow: hidden; transition: all var(--transition); }
.teacher-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.tc-header { position: relative; padding: 24px 24px 0; display: flex; justify-content: center; }
.tc-avatar { width: 80px; height: 80px; border-radius: 50%; object-fit: cover;
  border: 3px solid var(--primary-light); }
.tc-avatar-demo { width: 80px; height: 80px; border-radius: 50%; background: var(--primary-light);
  display: flex; align-items: center; justify-content: center; font-size: 36px; }
.tc-badge-featured {
  position: absolute; top: 12px; right: 12px;
  background: #FEF3C7; color: #92400E; padding: 3px 10px;
  border-radius: 100px; font-size: 11px; font-weight: 600;
}
.tc-body { padding: 16px 20px 20px; }
.tc-body h3 { font-size: 16px; font-weight: 700; margin-bottom: 4px; }
.tc-subjects { font-size: 13px; color: var(--primary); margin-bottom: 8px; }
.tc-rating { display: flex; align-items: center; gap: 6px; font-size: 13px; margin-bottom: 10px; }
.tc-rating .stars { color: var(--accent); }
.tc-rating span { color: var(--text-muted); }
.tc-meta { font-size: 12px; color: var(--text-muted); display: flex; flex-direction: column; gap: 3px; margin-bottom: 16px; }
.tc-footer { display: flex; align-items: center; justify-content: space-between; }
.tc-price { font-size: 18px; font-weight: 800; color: var(--primary); }

/* ── WHY SECTION ─────────────────────────────────────────── */
.why-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.why-text h2 { font-size: clamp(1.75rem, 3vw, 2.25rem); font-weight: 800; margin-bottom: 12px; }
.why-text p { color: var(--text-muted); margin-bottom: 20px; }
.why-list { list-style: none; margin-bottom: 28px; }
.why-list li { padding: 6px 0; font-size: 15px; }
.why-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.why-card { background: #fff; border-radius: var(--radius); padding: 20px;
  box-shadow: var(--shadow); transition: all var(--transition); }
.why-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.wc-icon { font-size: 28px; margin-bottom: 10px; }
.why-card h4 { font-size: 15px; font-weight: 700; margin-bottom: 6px; }
.why-card p  { font-size: 13px; color: var(--text-muted); }

/* ── TESTIMONIALS ────────────────────────────────────────── */
.testimonials-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.testimonial-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 24px; }
.tc-stars { color: var(--accent); font-size: 18px; margin-bottom: 12px; }
.testimonial-card p { color: var(--text-muted); font-size: 14px; font-style: italic; margin-bottom: 16px; }
.tc-author { display: flex; align-items: center; gap: 12px; }
.tca-avatar { width: 40px; height: 40px; border-radius: 50%; background: var(--primary-light);
  display: flex; align-items: center; justify-content: center; font-size: 20px; }
.tc-author strong { font-size: 14px; }
.tc-author small { color: var(--text-muted); font-size: 12px; }

/* ── CTA SECTION ─────────────────────────────────────────── */
.cta-section { padding: 72px 0; }
.cta-box {
  background: linear-gradient(135deg, var(--primary) 0%, #7C3AED 100%);
  border-radius: 24px; padding: 64px 48px; text-align: center; color: #fff;
}
.cta-box h2 { font-size: clamp(1.75rem, 3vw, 2.5rem); font-weight: 800; margin-bottom: 12px; }
.cta-box p  { font-size: 17px; opacity: .9; margin-bottom: 28px; }
.cta-btns   { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ── FOOTER ──────────────────────────────────────────────── */
.footer { background: var(--text); color: #94A3B8; padding: 60px 0 20px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .nav-logo { color: #fff; margin-bottom: 12px; }
.footer-brand .logo-text strong { color: var(--primary); }
.footer-brand p { font-size: 14px; margin-bottom: 16px; }
.social-links { display: flex; gap: 12px; font-size: 20px; }
.footer h4 { color: #fff; font-size: 14px; font-weight: 700; margin-bottom: 16px; }
.footer ul { list-style: none; }
.footer ul li { margin-bottom: 8px; }
.footer ul a { color: #94A3B8; font-size: 14px; }
.footer ul a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid #1E293B; padding-top: 20px;
  text-align: center; font-size: 13px; }

/* ── FORMS ───────────────────────────────────────────────── */
.form-group { margin-bottom: 18px; }
.form-label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: var(--text); }
.form-control {
  width: 100%; padding: 11px 14px; border: 1.5px solid var(--border);
  border-radius: 8px; font-family: var(--font); font-size: 14px; color: var(--text);
  background: #fff; transition: border-color var(--transition); outline: none;
}
.form-control:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,.1); }
textarea.form-control { resize: vertical; min-height: 100px; }
select.form-control { cursor: pointer; }
.form-control.is-invalid { border-color: #DC2626; }
.invalid-feedback { font-size: 12px; color: #DC2626; margin-top: 4px; }
.form-hint { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

/* ── CARDS / PANELS ─────────────────────────────────────── */
.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 24px; }
.card-header { display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px; padding-bottom: 16px; border-bottom: 1px solid var(--border); }
.card-header h3 { font-size: 17px; font-weight: 700; }

/* ── DASHBOARD ───────────────────────────────────────────── */
.dashboard-layout { display: grid; grid-template-columns: 240px 1fr; gap: 24px;
  min-height: calc(100vh - 64px); padding: 24px 0; }
.sidebar { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 20px; height: fit-content; position: sticky; top: 80px; }
.sidebar-nav { list-style: none; margin-top: 8px; }
.sidebar-nav li a {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; border-radius: 8px; font-size: 14px; font-weight: 500;
  color: var(--text-muted); transition: all var(--transition);
}
.sidebar-nav li a:hover, .sidebar-nav li a.active {
  background: var(--primary-light); color: var(--primary);
}
.sidebar-nav li a .nav-icon { font-size: 16px; }
.stat-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; text-align: center; }
.stat-card .sc-num { font-size: 28px; font-weight: 800; color: var(--primary); }
.stat-card .sc-label { font-size: 13px; color: var(--text-muted); margin-top: 4px; }
.stat-card .sc-icon { font-size: 24px; margin-bottom: 8px; }

/* ── TABLE ───────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
thead th { background: var(--bg-light); padding: 12px 16px; text-align: left;
  font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .5px;
  color: var(--text-muted); border-bottom: 1px solid var(--border); }
tbody td { padding: 12px 16px; border-bottom: 1px solid var(--border); }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--bg-light); }
.badge { display: inline-flex; align-items: center; padding: 3px 10px; border-radius: 100px;
  font-size: 11px; font-weight: 600; }
.badge-success { background: #D1FAE5; color: #065F46; }
.badge-warning { background: #FEF3C7; color: #92400E; }
.badge-danger  { background: #FEE2E2; color: #991B1B; }
.badge-info    { background: #DBEAFE; color: #1E40AF; }
.badge-muted   { background: var(--bg-light); color: var(--text-muted); }

/* ── ALERTS ─────────────────────────────────────────────── */
.alert { padding: 14px 18px; border-radius: 8px; font-size: 14px; margin-bottom: 16px; }
.alert-success { background: #D1FAE5; color: #065F46; border: 1px solid #A7F3D0; }
.alert-danger  { background: #FEE2E2; color: #991B1B; border: 1px solid #FECACA; }
.alert-info    { background: #DBEAFE; color: #1E40AF; border: 1px solid #BFDBFE; }

/* ── STAR RATING ─────────────────────────────────────────── */
.star-rating { display: flex; gap: 4px; }
.star { font-size: 24px; cursor: pointer; color: #D1D5DB; transition: color var(--transition); }
.star.active, .star:hover { color: var(--accent); }

/* ── PAGINATION ──────────────────────────────────────────── */
.pagination { display: flex; gap: 6px; justify-content: center; margin-top: 32px; }
.page-link { width: 36px; height: 36px; border-radius: 8px; border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center; font-size: 14px;
  font-weight: 500; color: var(--text); transition: all var(--transition); cursor: pointer; }
.page-link:hover, .page-link.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ── FILTERS ─────────────────────────────────────────────── */
.filters-bar { background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 20px; margin-bottom: 24px; display: flex; gap: 12px; flex-wrap: wrap; align-items: flex-end; }
.filter-group label { font-size: 12px; font-weight: 600; color: var(--text-muted);
  display: block; margin-bottom: 4px; }
.filter-group select { padding: 8px 12px; border: 1px solid var(--border); border-radius: 6px;
  font-family: var(--font); font-size: 13px; color: var(--text); outline: none; cursor: pointer; }

/* ── CHAT ────────────────────────────────────────────────── */
.chat-wrap { display: grid; grid-template-columns: 280px 1fr; height: 500px; border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; }
.chat-list { border-right: 1px solid var(--border); overflow-y: auto; }
.chat-item { padding: 14px 16px; cursor: pointer; border-bottom: 1px solid var(--border); transition: background var(--transition); }
.chat-item:hover, .chat-item.active { background: var(--primary-light); }
.chat-messages { display: flex; flex-direction: column; }
.chat-body { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.msg { max-width: 70%; padding: 10px 14px; border-radius: 12px; font-size: 14px; }
.msg-out { align-self: flex-end; background: var(--primary); color: #fff; border-radius: 12px 12px 0 12px; }
.msg-in  { align-self: flex-start; background: var(--bg-light); border-radius: 12px 12px 12px 0; }
.chat-input-bar { padding: 12px; border-top: 1px solid var(--border); display: flex; gap: 8px; }
.chat-input-bar input { flex: 1; padding: 10px 14px; border: 1px solid var(--border); border-radius: 8px;
  font-family: var(--font); font-size: 14px; outline: none; }
.chat-input-bar input:focus { border-color: var(--primary); }

/* ── RESPONSIVE ─────────────────────────────────────────── */
@media (max-width: 1024px) {
  .hero .container { grid-template-columns: 1fr; text-align: center; }
  .hero-visual { display: none; }
  .why-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .dashboard-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
}
@media (max-width: 768px) {
  .section { padding: 48px 0; }
  .nav-links { display: none; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0;
    background: #fff; border-top: 1px solid var(--border); padding: 16px; gap: 4px; z-index: 999; }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; margin-left: auto; }
  .search-bar { flex-direction: column; }
  .subjects-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .chat-wrap { grid-template-columns: 1fr; }
  .chat-list { display: none; }
  .cta-box { padding: 40px 24px; }
}
@media (max-width: 480px) {
  .subjects-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-cards { grid-template-columns: 1fr 1fr; }
  .hero-stat-cards { grid-template-columns: 1fr 1fr; }
}