/* LearnHub: indigo and purple theme. No external fonts, icons or scripts. */
:root {
  --indigo-50: #eef2ff; --indigo-100: #e0e7ff; --indigo-200: #c7d2fe;
  --indigo-500: #6366f1; --indigo-600: #4f46e5; --indigo-700: #4338ca;
  --purple-50: #faf5ff; --purple-600: #7c3aed;
  --gray-50: #f9fafb; --gray-100: #f3f4f6; --gray-200: #e5e7eb; --gray-300: #d1d5db;
  --gray-500: #6b7280; --gray-700: #374151; --gray-900: #111827;
  --danger: #b91c1c; --ok: #15803d;
  --shadow-sm: 0 1px 3px rgba(17, 24, 39, .08);
  --shadow-lg: 0 12px 30px -8px rgba(79, 70, 229, .22);
}
* { box-sizing: border-box; margin: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, Tahoma, sans-serif;
  color: var(--gray-900); background: var(--gray-50); line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { line-height: 1.15; letter-spacing: -.02em; }
h1 { font-size: clamp(2.2rem, 6vw, 3.6rem); font-weight: 800; }
h2 { font-size: clamp(1.7rem, 3.5vw, 2.4rem); font-weight: 800; }
h3 { font-size: 1.1rem; font-weight: 600; letter-spacing: 0; }
a { color: var(--indigo-600); }
img { max-width: 100%; display: block; }
:focus-visible { outline: 3px solid var(--indigo-500); outline-offset: 2px; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 1.25rem; }
.muted { color: var(--gray-500); }
.center { text-align: center; }
.icon { width: 24px; height: 24px; flex: none; }
.icon-circle { width: 48px; height: 48px; border-radius: 12px; background: var(--indigo-100); color: var(--indigo-600); display: grid; place-items: center; flex: none; }

/* Devant wordmark */
.logo { font-weight: 800; font-size: 1.6rem; letter-spacing: .12em; color: var(--indigo-600); text-decoration: none; }
.logo span { color: var(--purple-600); }
.site-footer .logo { color: #fff; }
.site-footer .logo span { color: #a78bfa; }

/* header */
.site-header { background: rgba(255, 255, 255, .85); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--gray-200); position: sticky; top: 0; z-index: 20; }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 66px; }
.brand { font-weight: 800; font-size: 1.5rem; color: var(--indigo-600); text-decoration: none; letter-spacing: -.03em; }
.site-nav { display: flex; align-items: center; gap: 1.5rem; }
.site-nav a:not(.btn) { text-decoration: none; color: var(--gray-700); font-weight: 500; font-size: .95rem; }
.site-nav a:not(.btn):hover { color: var(--indigo-600); }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: .5rem; border: 2px solid var(--indigo-600); background: var(--indigo-600); color: #fff !important; padding: .75rem 1.5rem; border-radius: 10px; font: inherit; font-weight: 600; text-decoration: none; cursor: pointer; box-shadow: 0 4px 12px rgba(79, 70, 229, .25); transition: background .2s, transform .2s, box-shadow .2s; }
.btn:hover { background: var(--indigo-700); border-color: var(--indigo-700); transform: translateY(-1px); }
.btn:disabled { opacity: .6; cursor: wait; transform: none; }
.btn.secondary { background: #fff; color: var(--indigo-600) !important; box-shadow: none; }
.btn.secondary:hover { background: var(--indigo-50); border-color: var(--indigo-600); }
.btn.light { background: #fff; border-color: #fff; color: var(--indigo-700) !important; box-shadow: none; }
.btn.light:hover { background: var(--indigo-50); border-color: var(--indigo-50); }
.btn.small { padding: .45rem 1.1rem; font-size: .9rem; box-shadow: none; }
.btn.block { width: 100%; }
.actions { display: flex; gap: .85rem; flex-wrap: wrap; }

/* hero */
section { padding: 5rem 0; }
.hero { background: linear-gradient(135deg, var(--indigo-50) 0%, #fff 50%, var(--purple-50) 100%); padding: 5rem 0 6rem; overflow: hidden; }
.hero .wrap { display: grid; grid-template-columns: 1.1fr .9fr; gap: 3.5rem; align-items: center; }
.badge { display: inline-flex; align-items: center; gap: .5rem; background: var(--indigo-100); color: var(--indigo-700); padding: .35rem .95rem; border-radius: 999px; font-size: .85rem; font-weight: 600; margin-bottom: 1.25rem; }
.accent { color: var(--indigo-600); }
.hero p.lead { font-size: 1.2rem; color: var(--gray-500); margin: 1.25rem 0 2rem; max-width: 34rem; }
.ticks { list-style: none; padding: 0; display: flex; gap: .6rem 1.5rem; flex-wrap: wrap; margin-top: 2rem; color: var(--gray-700); font-weight: 500; font-size: .95rem; }
.ticks li { display: flex; align-items: center; gap: .45rem; }
.ticks .icon { width: 20px; height: 20px; color: var(--indigo-600); }
.poster { position: relative; max-width: 420px; margin: 0 auto; }
.poster::before { content: ""; position: absolute; inset: -16px; border-radius: 28px; background: linear-gradient(135deg, var(--indigo-200), #e9d5ff); transform: rotate(4deg); }
.poster img { position: relative; border-radius: 20px; box-shadow: 0 25px 50px -12px rgba(17, 24, 39, .35); width: 100%; }

/* Devant: hero panel, about, brand card */
.hero-panel { position: relative; background: linear-gradient(140deg, var(--indigo-600), var(--purple-600)); color: #fff; border-radius: 24px; padding: 2.25rem; box-shadow: 0 25px 50px -12px rgba(79, 70, 229, .45); }
.hero-panel ul { list-style: none; padding: 0; display: grid; gap: 1.5rem; }
.hero-panel li { display: flex; gap: 1rem; align-items: center; }
.hero-panel .icon-circle { background: rgba(255, 255, 255, .18); color: #fff; }
.hero-panel strong { display: block; font-size: 1.15rem; }
.hero-panel span { color: var(--indigo-100); font-size: .95rem; }
.about { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
.about h2 { margin: .25rem 0 1.25rem; }
.about p { color: var(--gray-500); margin-bottom: 1rem; font-size: 1.05rem; }
.vision { background: linear-gradient(140deg, var(--indigo-600), var(--purple-600)); color: #fff; border-radius: 20px; padding: 2.75rem; box-shadow: var(--shadow-lg); }
.vision h3 { font-size: 1.6rem; margin-bottom: .75rem; }
.vision p { color: var(--indigo-100); font-size: 1.1rem; margin: 0; }
.brand-card { max-width: 780px; margin: 0 auto; display: flex; gap: 1.5rem; align-items: center; }
.brand-card h3 { font-size: 1.8rem; color: var(--indigo-600); font-weight: 800; }
.brand-card p { color: var(--gray-500); margin: .4rem 0 1.25rem; }

/* feature cards */
.section-head { max-width: 40rem; margin-bottom: 2.5rem; }
.section-head.center { margin-left: auto; margin-right: auto; }
.eyebrow { color: var(--indigo-600); font-weight: 600; text-transform: uppercase; letter-spacing: .08em; font-size: .85rem; margin-bottom: .5rem; }
.section-head p { color: var(--gray-500); font-size: 1.1rem; margin-top: .75rem; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 1.5rem; }
.feature { background: #fff; border: 1px solid var(--gray-100); border-radius: 16px; padding: 1.75rem; box-shadow: var(--shadow-sm); transition: transform .2s, box-shadow .2s; }
.feature:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.feature .icon-circle { margin-bottom: 1.1rem; }
.feature p { color: var(--gray-500); margin-top: .4rem; }
.white { background: #fff; }
.soft { background: var(--gray-50); }

/* reviews */
.reviews { columns: 2 320px; column-gap: 1.5rem; }
.reviews img { background: #fff; border: 1px solid var(--gray-200); border-radius: 16px; padding: .5rem; box-shadow: var(--shadow-sm); margin-bottom: 1.5rem; break-inside: avoid; }

/* call to action band */
.band { background: linear-gradient(135deg, var(--indigo-600), var(--purple-600)); color: #fff; padding: 4rem 0; text-align: center; }
.band p { color: var(--indigo-100); font-size: 1.15rem; margin: .75rem auto 1.75rem; max-width: 34rem; }

/* contact */
.contact-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 3rem; align-items: start; }
.contact-list { list-style: none; padding: 0; display: grid; gap: 1.5rem; }
.contact-list li { display: flex; gap: 1rem; align-items: center; }
.contact-list strong { display: block; }
.contact-list span, .contact-list a { color: var(--gray-500); text-decoration: none; }
.contact-list a:hover { color: var(--indigo-600); }
.site-footer { background: var(--gray-900); color: #d1d5db; padding: 2.5rem 0; font-size: .9rem; }
.site-footer .wrap { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; align-items: center; }
.site-footer a { color: #fff; }
.site-footer .brand { color: #fff; font-size: 1.25rem; }

/* forms and cards */
.card { background: #fff; border: 1px solid var(--gray-100); border-radius: 20px; padding: 2rem; box-shadow: var(--shadow-lg); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 1rem; }
.form-grid .full { grid-column: 1 / -1; }
label { display: block; font-weight: 600; font-size: .9rem; margin: 1rem 0 .3rem; color: var(--gray-700); }
input, select, textarea { width: 100%; font: inherit; color: inherit; padding: .75rem .9rem; border: 1px solid var(--gray-300); border-radius: 8px; background: #fff; transition: border-color .2s, box-shadow .2s; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--indigo-600); box-shadow: 0 0 0 3px rgba(79, 70, 229, .2); }
input:user-invalid, select:user-invalid, textarea:user-invalid { border-color: var(--danger); }
textarea { min-height: 140px; resize: vertical; }
.hint { font-size: .82rem; color: var(--gray-500); margin-top: .25rem; }
.check { display: flex; gap: .65rem; align-items: flex-start; font-weight: 400; margin-top: 1.25rem; font-size: .9rem; }
.check input { width: auto; margin-top: .3rem; accent-color: var(--indigo-600); }
form .btn { margin-top: 1.5rem; }
.msg { margin-top: 1rem; font-weight: 600; min-height: 1.5rem; text-align: center; }
.msg.error { color: var(--danger); }
.msg.ok { color: var(--ok); }
.trap { position: absolute; left: -9999px; }

/* login / register */
.auth-bg { background: linear-gradient(135deg, var(--indigo-50) 0%, #fff 50%, var(--purple-50) 100%); }
.auth { min-height: calc(100vh - 66px); display: grid; align-items: center; padding: 2.5rem 0; }
.auth .card { max-width: 560px; margin: 0 auto; width: 100%; }
.auth .card.narrow { max-width: 440px; }
.auth .top { text-align: center; margin-bottom: .5rem; }
.auth .top .icon-circle { margin: 0 auto 1rem; width: 56px; height: 56px; border-radius: 16px; }
.auth h1 { font-size: 1.85rem; }
.auth .top p { color: var(--gray-500); margin-top: .35rem; }
.auth .hint.center { margin-top: 1.25rem; font-size: .9rem; }

/* dashboards */
.dash { padding: 2.5rem 0 4rem; }
.banner { background: linear-gradient(135deg, var(--indigo-600), var(--purple-600)); color: #fff; border-radius: 20px; padding: 2.25rem; margin-bottom: 1.5rem; box-shadow: var(--shadow-lg); }
.banner h1 { font-size: clamp(1.6rem, 4vw, 2.2rem); }
.banner p { color: var(--indigo-100); margin-top: .4rem; }
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 1rem; margin-bottom: 1.5rem; }
.tile { background: #fff; border: 1px solid var(--gray-100); border-radius: 16px; padding: 1.25rem 1.5rem; box-shadow: var(--shadow-sm); }
.tile b { display: block; font-size: 2rem; font-weight: 800; color: var(--indigo-600); line-height: 1.1; }
.tile span { color: var(--gray-500); font-size: .9rem; }
.panel { background: #fff; border: 1px solid var(--gray-100); border-radius: 16px; padding: 1.5rem; box-shadow: var(--shadow-sm); }
.panel + .panel { margin-top: 1.5rem; }
.panel-row { display: flex; gap: 1rem; align-items: center; }
.panel h2 { font-size: 1.3rem; margin-bottom: .25rem; }
.table-wrap { overflow-x: auto; margin-top: .75rem; }
table { width: 100%; border-collapse: collapse; font-size: .9rem; }
th, td { text-align: left; padding: .7rem .75rem; border-bottom: 1px solid var(--gray-100); vertical-align: top; }
th { background: var(--gray-50); color: var(--gray-500); font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; }
tbody tr:hover { background: var(--indigo-50); }
.pill { display: inline-block; padding: .15rem .65rem; border-radius: 999px; font-size: .78rem; font-weight: 600; }
.pill.student { background: var(--indigo-100); color: var(--indigo-700); }
.pill.tutor { background: #f3e8ff; color: #7e22ce; }
.pill.admin { background: var(--gray-900); color: #fff; }
.pill.on { background: #dcfce7; color: #166534; }
.pill.off { background: #fee2e2; color: #991b1b; }

/* legal pages */
.legal { max-width: 760px; margin: 0 auto; padding: 3rem 1.25rem 5rem; }
.legal h1 { margin-bottom: .5rem; }
.legal h2 { font-size: 1.35rem; margin-top: 2.25rem; }
.legal p, .legal li { margin-top: .6rem; color: var(--gray-700); }
.legal ul { padding-left: 1.25rem; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}
@media (max-width: 800px) {
  section { padding: 3.5rem 0; }
  .hero { padding: 3rem 0 4rem; }
  .hero .wrap, .contact-grid, .form-grid, .about { grid-template-columns: 1fr; gap: 2rem; }
  .brand-card { flex-direction: column; align-items: flex-start; }
  .poster { max-width: 300px; }
  .site-nav { gap: 1rem; }
  .site-nav .hide-sm { display: none; }
}

/* booking: student and tutor dashboards */
.hidden { display: none !important; }
.steps { list-style: none; padding: 0; margin-top: 1rem; display: grid; gap: 1.75rem; }
.step-head { display: flex; align-items: center; gap: .75rem; margin-bottom: .85rem; }
.step-num { width: 32px; height: 32px; border-radius: 50%; background: var(--indigo-600); color: #fff; display: grid; place-items: center; font-weight: 700; flex: none; }
.chips { display: flex; flex-wrap: wrap; gap: .6rem; }
.chip { font: inherit; font-weight: 600; padding: .55rem 1.1rem; border-radius: 999px; border: 2px solid var(--indigo-200); background: #fff; color: var(--indigo-700); cursor: pointer; transition: background .2s, border-color .2s, color .2s; }
.chip:hover { border-color: var(--indigo-600); }
.chip.selected { background: var(--indigo-600); border-color: var(--indigo-600); color: #fff; }
.choices { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 1rem; }
.choice { font: inherit; text-align: left; display: grid; gap: .15rem; padding: 1rem 1.1rem; border-radius: 14px; border: 2px solid var(--gray-200); background: #fff; cursor: pointer; transition: border-color .2s, background .2s, box-shadow .2s; }
.choice span { color: var(--gray-500); font-size: .88rem; }
.choice:hover { border-color: var(--indigo-500); }
.choice.selected { border-color: var(--indigo-600); background: var(--indigo-50); box-shadow: 0 0 0 3px rgba(79, 70, 229, .15); }
.day { font-size: .95rem; margin: 1.1rem 0 .5rem; color: var(--gray-700); }
.day:first-child { margin-top: 0; }
.summary { background: var(--indigo-50); border: 1px solid var(--indigo-200); border-radius: 14px; padding: 1rem 1.25rem; font-weight: 600; }
.lessons { display: grid; gap: .75rem; margin-top: 1rem; }
.lesson { display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap; padding: 1rem 1.25rem; border: 1px solid var(--gray-200); border-radius: 14px; }
.lesson b { display: block; }
.lesson .meta { color: var(--gray-500); font-size: .9rem; }
.lesson .side { display: flex; align-items: center; gap: .75rem; }
.pill.open { background: var(--gray-100); color: var(--gray-700); }
.inline-form { display: flex; gap: 1rem; flex-wrap: wrap; align-items: flex-end; margin-top: .5rem; }
.inline-form > div { flex: 1 1 200px; }
.inline-form .btn { margin-top: 0; }
.checks { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: .5rem 1rem; margin: 1rem 0; }
.checks label { display: flex; gap: .6rem; align-items: center; font-weight: 500; margin: 0; padding: .6rem .8rem; border: 1px solid var(--gray-200); border-radius: 10px; cursor: pointer; }
.checks input { width: auto; accent-color: var(--indigo-600); }