:root {
  --bg: #0b1020;
  --bg-soft: #11182b;
  --card: #151d31;
  --card-2: #1a2440;
  --text: #eef2ff;
  --muted: #98a2b8;
  --line: #283453;
  --accent: #73d0ff;
  --accent-2: #8b7dff;
  --success: #65d6a6;
  --warning: #ffd166;
  --danger: #ff7a90;
  --shadow: 0 18px 50px rgba(0, 0, 0, .22);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: radial-gradient(circle at top right, rgba(115, 208, 255, .08), transparent 28%), var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}
button, input, textarea { font: inherit; }
button { cursor: pointer; }

.topbar, .shell, footer { width: min(1180px, calc(100% - 32px)); margin-inline: auto; }
.topbar {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-end;
  padding: 36px 0 24px;
}
h1 { margin: 3px 0 5px; font-size: clamp(2rem, 5vw, 3.7rem); line-height: 1; letter-spacing: -.045em; }
h2 { margin: 0; font-size: clamp(1.5rem, 3vw, 2.2rem); letter-spacing: -.025em; }
h3 { margin-top: 0; }
.eyebrow { margin: 0; color: var(--accent); font-size: .76rem; font-weight: 800; letter-spacing: .16em; }
.subtitle { color: var(--muted); margin: 8px 0 0; }
.topbar-actions { display: flex; flex-wrap: wrap; gap: 10px; }

.btn {
  border: 1px solid transparent;
  border-radius: 12px;
  padding: 10px 14px;
  color: var(--text);
  background: var(--card-2);
}
.btn.secondary { border-color: var(--line); background: transparent; }
.btn.danger { border-color: rgba(255,122,144,.35); color: #ffc5cf; background: rgba(255,122,144,.08); }
.btn:hover { transform: translateY(-1px); }
.file-btn input { display: none; }

.hero-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.metric-card, .card, .daily-note-card, .day-card, .category-card {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255,255,255,.02), transparent), var(--card);
  border-radius: 18px;
  box-shadow: var(--shadow);
}
.metric-card { padding: 18px; min-height: 145px; display: flex; flex-direction: column; justify-content: space-between; }
.metric-card.accent { background: linear-gradient(145deg, rgba(115,208,255,.14), rgba(139,125,255,.08)), var(--card); }
.metric-card span, .metric-card small { color: var(--muted); }
.metric-card strong { font-size: 1.65rem; }
.progress-track { height: 8px; background: #202b47; border-radius: 999px; overflow: hidden; }
.progress-bar { height: 100%; width: 0; background: linear-gradient(90deg, var(--accent), var(--accent-2)); transition: width .25s ease; }

.tabs { display: flex; gap: 8px; overflow-x: auto; padding: 26px 0 14px; scrollbar-width: thin; }
.tab { white-space: nowrap; border: 1px solid var(--line); background: transparent; color: var(--muted); padding: 9px 14px; border-radius: 999px; }
.tab.active { color: var(--bg); background: var(--accent); border-color: var(--accent); font-weight: 800; }
.panel { display: none; padding: 10px 0 30px; }
.panel.active { display: block; }
.section-heading { display: flex; justify-content: space-between; gap: 16px; align-items: end; margin: 10px 0 18px; }
.pill { border: 1px solid var(--line); background: var(--bg-soft); color: var(--muted); border-radius: 999px; padding: 7px 11px; font-size: .85rem; }

.task-list { display: grid; gap: 10px; }
.task {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px;
  align-items: center;
  border: 1px solid var(--line);
  background: var(--card);
  padding: 14px;
  border-radius: 14px;
}
.task.done { opacity: .62; }
.task.done .task-title { text-decoration: line-through; }
.task input[type="checkbox"] { width: 20px; height: 20px; accent-color: var(--success); }
.task-title { font-weight: 750; }
.task-meta { color: var(--muted); font-size: .86rem; margin-top: 2px; }
.task-hours { color: var(--accent); font-weight: 800; font-size: .86rem; }

.daily-note-card { padding: 16px; margin-top: 18px; }
.daily-note-card label { display: block; font-weight: 800; margin-bottom: 8px; }
textarea, input[type="date"] {
  width: 100%; border: 1px solid var(--line); background: #0f1628; color: var(--text); border-radius: 12px; padding: 12px;
}
textarea { resize: vertical; }
.daily-note-card small { display: block; color: var(--muted); margin-top: 7px; }
.notice { border: 1px dashed var(--line); background: rgba(115,208,255,.05); color: var(--muted); padding: 14px; border-radius: 14px; margin-bottom: 14px; }
.hidden { display: none !important; }

.phase-timeline { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; margin-bottom: 18px; }
.phase { border: 1px solid var(--line); border-radius: 14px; padding: 13px; background: var(--bg-soft); }
.phase strong { display: block; }
.phase small { color: var(--muted); }
.schedule-controls { display: grid; grid-template-columns: auto 220px auto; align-items: center; gap: 10px; margin: 22px 0 14px; }
.schedule-days { display: grid; gap: 14px; }
.day-card { padding: 16px; }
.day-card header { display: flex; justify-content: space-between; gap: 12px; align-items: center; margin-bottom: 12px; }
.day-card.today { outline: 2px solid rgba(115,208,255,.55); }
.day-card .day-label { font-weight: 850; font-size: 1.05rem; }
.day-card .day-phase { color: var(--muted); font-size: .85rem; }

.category-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-bottom: 18px; }
.category-card { padding: 16px; }
.category-card header { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.category-card strong { font-size: 1.2rem; }
.category-card p { color: var(--muted); margin: 8px 0 12px; }
.card { padding: 18px; }
.mastery-scale { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; }
.mastery-scale span { border: 1px solid var(--line); border-radius: 12px; padding: 10px; color: var(--muted); font-size: .85rem; }
.mastery-scale b { color: var(--accent); display: block; font-size: 1.1rem; }

.interview-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-bottom: 18px; }
ul { padding-left: 20px; }
li + li { margin-top: 6px; }
.danger-zone { margin-top: 18px; padding: 16px; border: 1px solid rgba(255,122,144,.25); border-radius: 14px; display: flex; justify-content: space-between; gap: 16px; align-items: center; }
.danger-zone p { color: var(--muted); margin: 4px 0 0; }

footer { display: flex; justify-content: space-between; gap: 16px; color: var(--muted); border-top: 1px solid var(--line); padding: 20px 0 28px; font-size: .85rem; }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: repeat(2, 1fr); }
  .phase-timeline { grid-template-columns: repeat(2, 1fr); }
  .category-grid, .interview-grid { grid-template-columns: 1fr 1fr; }
  .mastery-scale { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 640px) {
  .topbar { align-items: stretch; flex-direction: column; padding-top: 24px; }
  .topbar-actions { display: grid; grid-template-columns: 1fr 1fr; }
  .btn { text-align: center; }
  .hero-grid, .category-grid, .interview-grid, .phase-timeline { grid-template-columns: 1fr; }
  .section-heading { align-items: flex-start; flex-direction: column; }
  .schedule-controls { grid-template-columns: 1fr; }
  .task { grid-template-columns: auto 1fr; }
  .task-hours { grid-column: 2; }
  .mastery-scale { grid-template-columns: repeat(2, 1fr); }
  footer { flex-direction: column; }
}