:root {
  --bg: #edf8ff;
  --ink: #071b35;
  --muted: #61758e;
  --blue: #1463ff;
  --cyan: #00c8ff;
  --line: rgba(29, 113, 221, 0.18);
  --surface: #fff;
  --radius: 8px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 0%, rgba(0, 200, 255, 0.22), transparent 34%),
    linear-gradient(180deg, #eaf8ff, #f8fcff);
}
a { color: inherit; text-decoration: none; }
button { cursor: pointer; }
button, input, select, textarea { font: inherit; }

.student-shell { min-height: 100vh; }
.student-hero {
  padding: 20px clamp(16px, 4vw, 48px) 34px;
  color: #fff;
  background: linear-gradient(130deg, #061936, #074b93 58%, #00a7d5);
}
nav, nav div, .section-heading, .hero-grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; }
.brand span {
  width: 38px; height: 38px; display: grid; place-items: center; border-radius: var(--radius);
  color: #06213a; background: linear-gradient(135deg, #dffbff, #9ed4ff);
}
nav a { color: #d8f2ff; }
.hero-grid { margin-top: 42px; align-items: stretch; }
.hero-grid h1 { margin: 8px 0 12px; font-size: clamp(34px, 5vw, 58px); line-height: 1.1; }
.hero-grid p { max-width: 720px; color: #c5e5f8; line-height: 1.7; }
.eyebrow { color: #55e6ff; font-size: 12px; font-weight: 900; text-transform: uppercase; }
.profile-summary {
  min-width: 320px; padding: 18px; border: 1px solid rgba(139, 218, 255, 0.3); border-radius: var(--radius);
  background: rgba(255,255,255,0.1); backdrop-filter: blur(14px);
}

.login-panel, .student-workspace { width: min(1240px, calc(100% - 32px)); margin: 18px auto 40px; }
.login-panel, .panel, .metric-card, .item-card, .plan-card {
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface);
  box-shadow: 0 18px 44px rgba(29, 86, 156, 0.1);
}
.login-panel, .panel { padding: 20px; }
.student-workspace { display: grid; gap: 16px; }
.metric-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.metric-card { min-height: 118px; padding: 16px; display: grid; align-content: space-between; }
.metric-card span, .item-card p, label { color: var(--muted); }
.metric-card strong { font-size: 30px; }
.section-heading h2 { margin: 4px 0 0; }
.list-grid, .plan-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-top: 14px; }
.item-card, .plan-card { padding: 14px; }
.item-card h3, .item-card p, .plan-card h3, .plan-card p { margin: 0; }
.item-card p, .plan-card p { margin-top: 6px; line-height: 1.5; }
.pill { display: inline-flex; min-height: 24px; padding: 0 8px; align-items: center; border-radius: var(--radius); background: #e8f4ff; color: #0d5aa4; font-size: 12px; margin-top: 10px; }
.form-grid { display: grid; gap: 12px; margin-top: 14px; }
.split-form { grid-template-columns: repeat(2, 1fr); }
.wide { grid-column: 1 / -1; }
label { display: grid; gap: 7px; font-size: 14px; }
input, select, textarea {
  width: 100%; border: 1px solid var(--line); border-radius: var(--radius); padding: 11px 12px; outline: 0; background: #fbfdff;
}
textarea { min-height: 96px; resize: vertical; }
.primary-button {
  min-height: 42px; padding: 0 16px; border: 0; border-radius: var(--radius); color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
}
.toast {
  position: fixed; left: 50%; bottom: 22px; transform: translateX(-50%) translateY(18px); opacity: 0;
  pointer-events: none; padding: 10px 14px; border-radius: var(--radius); color: #fff; background: #061936; transition: .2s ease;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
@media (max-width: 900px) {
  .hero-grid, nav { display: grid; }
  .metric-grid, .list-grid, .plan-grid, .split-form { grid-template-columns: 1fr; }
  .profile-summary { min-width: 0; }
}