:root {
  --primary: #32d74b;
  --primary-dark: #20b83a;
  --primary-soft: #17351f;
  --secondary: #3b82f6;
  --warning: #ffc107;
  --danger: #ff5a5f;
  --text: #f2f4f7;
  --muted: #b5bdc8;
  --surface: #1a1d23;
  --surface-light: #252a33;
  --background: #0f1115;
  --border: #343a46;
  --shadow: 0 20px 60px rgba(0, 0, 0, .38);
  --radius: 22px;
  --container: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 85% 8%, rgba(59,130,246,.14), transparent 30%), radial-gradient(circle at 12% 14%, rgba(50,215,75,.1), transparent 26%), var(--background);
}
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button { color: inherit; }
.hidden { display: none !important; }

.container { width: min(calc(100% - 32px), var(--container)); margin: 32px auto 60px; }

.main-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15,17,21,.94);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(14px);
}
.nav-container {
  width: min(calc(100% - 32px), var(--container));
  min-height: 76px;
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 20px;
}
.logo-nav, .auth-logo { display: flex; align-items: center; gap: 9px; font-size: 1.35rem; font-weight: 800; }
.logo-nav strong, .auth-logo strong {
  display: grid;
  place-items: center;
  min-width: 42px;
  height: 42px;
  padding: 0 10px;
  border-radius: 13px;
  color: #101410;
  background: linear-gradient(135deg, var(--primary), var(--warning));
}
.logo-nav span, .auth-logo span { font-weight: 700; }
.user-greeting { margin-left: auto; color: var(--muted); font-size: .9rem; font-weight: 700; }
.nav-menu { display: flex; align-items: center; gap: 7px; margin: 0; padding: 0; list-style: none; }
.nav-menu a, .nav-menu button {
  min-height: 42px;
  padding: 0 13px;
  border: 0;
  border-radius: 11px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: .86rem;
  font-weight: 700;
}
.nav-menu a:hover, .nav-menu a.active { color: var(--text); background: var(--surface-light); }
.nav-menu .logout { color: #ffb1b4; border: 1px solid rgba(255,90,95,.45); }
.menu-mobile-btn { display: none; margin-left: auto; border: 0; background: transparent; font-size: 1.65rem; cursor: pointer; }

.hero {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  align-items: center;
  gap: 42px;
  min-height: calc(100vh - 140px);
  padding: 42px 0;
}
.hero h1 { margin: 16px 0 20px; font-size: clamp(2.6rem, 6vw, 4.7rem); line-height: 1.04; letter-spacing: -.055em; }
.hero p { max-width: 680px; margin: 0; color: var(--muted); font-size: 1.08rem; line-height: 1.7; }
.page-header { display: flex; justify-content: space-between; align-items: end; gap: 18px; flex-wrap: wrap; margin: 12px 0 24px; }
.page-header h1 { margin: 0 0 7px; font-size: clamp(2rem, 5vw, 3rem); letter-spacing: -.04em; }
.page-header p { margin: 0; color: var(--muted); }
.hero-badge, .badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 6px 10px;
  border: 1px solid rgba(50,215,75,.35);
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: .76rem;
  font-weight: 800;
}

.card {
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: var(--shadow);
}
.card h1, .card h2, .card h3 { margin-top: 0; }
.card p { color: var(--muted); line-height: 1.65; }
.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.stats { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 16px; margin-bottom: 22px; }
.stat { border-top: 5px solid var(--primary); }
.stat:nth-child(2) { border-top-color: var(--secondary); }
.stat:nth-child(3) { border-top-color: var(--warning); }
.stat small { color: var(--muted); font-weight: 700; }
.stat strong { display: block; margin-top: 8px; color: var(--text); font-size: 2.2rem; }

label { display: block; margin-bottom: 7px; color: var(--text); font-size: .82rem; font-weight: 800; }
.form-group { margin-bottom: 16px; }
input, select, textarea {
  width: 100%;
  padding: 12px 13px;
  border: 1px solid var(--border);
  border-radius: 11px;
  outline: none;
  background: var(--surface-light);
  color: var(--text);
}
input::placeholder, textarea::placeholder { color: #8d96a3; }
input:focus, select:focus, textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(50,215,75,.14); }
textarea { min-height: 170px; resize: vertical; line-height: 1.55; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 16px;
  border: 0;
  border-radius: 11px;
  cursor: pointer;
  font-weight: 800;
  transition: .2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { color: #101410; background: var(--primary); box-shadow: 0 10px 25px rgba(50,215,75,.18); }
.btn-primary:hover { background: #54e768; }
.btn-secondary { color: white; background: var(--secondary); }
.btn-outline { color: var(--secondary); border: 1px solid var(--secondary); background: transparent; }
.btn-danger { color: #ffd9da; border: 1px solid rgba(255,90,95,.42); background: rgba(255,90,95,.13); }
.btn:disabled { opacity: .58; cursor: not-allowed; transform: none; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; }

.auth-card { width: min(470px, 100%); justify-self: end; }
.auth-logo { justify-content: center; margin-bottom: 20px; font-size: 1.85rem; }
.auth-switch { margin-top: 16px; color: var(--muted); text-align: center; }
.auth-switch button { border: 0; background: none; color: var(--secondary); font-weight: 800; cursor: pointer; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 13px 10px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: middle; }
th { color: var(--muted); font-size: .74rem; text-transform: uppercase; letter-spacing: .05em; }
td small { color: var(--muted); }
.empty { padding: 34px 12px; color: var(--muted); text-align: center; }
.message { display: none; padding: 12px 14px; border-radius: 10px; margin-bottom: 16px; font-weight: 700; }
.message.show { display: block; }
.message.success { color: #b9ffc4; border: 1px solid rgba(50,215,75,.35); background: rgba(50,215,75,.12); }
.message.error { color: #ffd1d3; border: 1px solid rgba(255,90,95,.4); background: rgba(255,90,95,.12); }

.student-page { background: radial-gradient(circle at 50% 0, rgba(50,215,75,.14), transparent 35%), var(--background); }
.student-shell { width: min(850px, calc(100% - 26px)); margin: 36px auto; }
.student-header { margin-bottom: 22px; text-align: center; }
.student-header p { color: var(--muted); }
.student-header .auth-logo { margin-bottom: 8px; }
.plan-section { min-height: 130px; color: var(--text); white-space: pre-wrap; line-height: 1.7; }
.updated { color: var(--muted); font-size: .82rem; }
#error-state { color: #ffd1d3 !important; }

@media (max-width: 860px) {
  .hero, .grid-2, .grid-3, .stats { grid-template-columns: 1fr; }
  .hero { min-height: auto; }
  .auth-card { justify-self: stretch; }
  .user-greeting { display: none; }
  .menu-mobile-btn { display: block; }
  .nav-menu {
    display: none;
    position: absolute;
    top: 76px;
    left: 16px;
    right: 16px;
    flex-direction: column;
    align-items: stretch;
    padding: 14px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--surface);
    box-shadow: var(--shadow);
  }
  .nav-menu.active { display: flex; }
  .nav-menu a, .nav-menu button { display: block; width: 100%; text-align: left; }
}

@media (max-width: 620px) {
  .container { width: min(calc(100% - 24px), var(--container)); margin-top: 24px; }
  .hero { padding-top: 24px; }
  .hero h1 { font-size: 2.6rem; }
  .card { padding: 18px; border-radius: 16px; }
  .actions .btn { width: 100%; }
  th, td { padding: 11px 8px; }
}