/* App CSS — inherits design tokens from theme.css */
/* Loaded by all app pages. Does not redefine :root tokens. */

/* ---- NAV ---- */
.app-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  height: 64px;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.app-nav .logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--fg);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.app-nav .logo span { color: var(--accent-light); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a, .nav-links button {
  padding: 8px 16px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  color: var(--fg-muted);
  text-decoration: none;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
  transition: color 0.2s, background 0.2s;
}

.nav-links a:hover, .nav-links button:hover { color: var(--fg); background: rgba(255,255,255,0.05); }
.nav-links a.active { color: var(--accent-light); background: var(--accent-glow); }

/* ---- PAGE SHELL ---- */
.app-page {
  min-height: 100vh;
  padding: 88px 24px 48px;
  max-width: 1000px;
  margin: 0 auto;
}

.page-header {
  margin-bottom: 40px;
}

.page-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.page-subtitle { color: var(--fg-muted); font-size: 15px; }

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font-body);
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover { background: #5a4dcc; transform: translateY(-1px); }

.btn-secondary {
  background: var(--bg-card);
  color: var(--fg);
  border: 1px solid rgba(255,255,255,0.08);
}

.btn-secondary:hover { border-color: rgba(255,255,255,0.15); background: #1e1e2a; }

.btn-ghost {
  background: transparent;
  color: var(--fg-muted);
  border: 1px solid rgba(255,255,255,0.06);
}

.btn-ghost:hover { color: var(--fg); border-color: rgba(255,255,255,0.12); }

.btn-danger {
  background: rgba(253,121,168,0.15);
  color: var(--coral);
  border: 1px solid rgba(253,121,168,0.2);
}

.btn-danger:hover { background: rgba(253,121,168,0.25); }

.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-teal { background: rgba(0,206,201,0.15); color: var(--teal); border: 1px solid rgba(0,206,201,0.2); }
.btn-teal:hover { background: rgba(0,206,201,0.25); }

/* ---- CARDS ---- */
.card {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.2s;
}

.card:hover { border-color: rgba(255,255,255,0.09); }
.card + .card { margin-top: 16px; }

/* ---- GRID LAYOUTS ---- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

/* ---- MATCH CARD ---- */
.match-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.match-score-badge {
  position: absolute;
  top: 20px; right: 20px;
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 700;
  background: var(--accent-glow);
  color: var(--accent-light);
  border: 1px solid rgba(108,92,231,0.2);
}

.match-card .user-name {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.match-card .user-bio {
  color: var(--fg-muted);
  font-size: 13px;
  line-height: 1.5;
}

.skill-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

.pill {
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 500;
}

.pill-teach { background: var(--teal-glow); color: var(--teal); border: 1px solid rgba(0,206,201,0.15); }
.pill-learn { background: var(--accent-glow); color: var(--accent-light); border: 1px solid rgba(108,92,231,0.15); }
.pill-muted { background: rgba(255,255,255,0.04); color: var(--fg-muted); border: 1px solid rgba(255,255,255,0.06); }

.match-direction-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--fg-muted);
  margin-bottom: 4px;
}

.match-actions {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

/* ---- SESSION CARD ---- */
.session-card {
  display: flex;
  align-items: flex-start;
  gap: 20px;
}

.session-status {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.status-proposed  { background: rgba(253,203,110,0.12); color: var(--gold); border: 1px solid rgba(253,203,110,0.2); }
.status-confirmed { background: var(--teal-glow); color: var(--teal); border: 1px solid rgba(0,206,201,0.2); }
.status-completed { background: rgba(108,92,231,0.1); color: var(--accent-light); border: 1px solid rgba(108,92,231,0.15); }
.status-cancelled { background: rgba(255,255,255,0.04); color: var(--fg-muted); border: 1px solid rgba(255,255,255,0.06); }

/* ---- FORM ELEMENTS ---- */
.form-group { margin-bottom: 20px; }

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--fg-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-input, .form-textarea, .form-select {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-subtle);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px;
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s;
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
  border-color: var(--accent);
}

.form-textarea { min-height: 96px; resize: vertical; }

/* ---- SKILL SELECTOR ---- */
.skill-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
  max-height: 240px;
  overflow-y: auto;
  padding: 4px;
}

.skill-toggle {
  padding: 6px 14px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid rgba(255,255,255,0.08);
  background: var(--bg-subtle);
  color: var(--fg-muted);
  transition: all 0.15s;
  font-family: var(--font-body);
}

.skill-toggle:hover { border-color: rgba(255,255,255,0.15); color: var(--fg); }
.skill-toggle.selected-teach { background: var(--teal-glow); color: var(--teal); border-color: rgba(0,206,201,0.3); }
.skill-toggle.selected-learn { background: var(--accent-glow); color: var(--accent-light); border-color: rgba(108,92,231,0.3); }

/* ---- EMPTY STATES ---- */
.empty-state {
  text-align: center;
  padding: 64px 24px;
  color: var(--fg-muted);
}

.empty-state .empty-icon { font-size: 48px; margin-bottom: 16px; }
.empty-state h3 { font-family: var(--font-display); font-size: 1.2rem; font-weight: 700; color: var(--fg); margin-bottom: 8px; }
.empty-state p { font-size: 14px; line-height: 1.6; max-width: 380px; margin: 0 auto 24px; }

/* ---- ALERT ---- */
.alert {
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 14px;
  margin-bottom: 20px;
}

.alert-error { background: rgba(253,121,168,0.08); color: var(--coral); border: 1px solid rgba(253,121,168,0.2); }
.alert-success { background: var(--teal-glow); color: var(--teal); border: 1px solid rgba(0,206,201,0.2); }

/* ---- TABS ---- */
.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 32px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  padding-bottom: 0;
}

.tab-btn {
  padding: 10px 18px;
  background: none;
  border: none;
  color: var(--fg-muted);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 0.2s, border-color 0.2s;
}

.tab-btn:hover { color: var(--fg); }
.tab-btn.active { color: var(--accent-light); border-bottom-color: var(--accent); }

/* ---- AUTH PAGE ---- */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  position: relative;
  z-index: 1;
}

.auth-box {
  width: 100%;
  max-width: 420px;
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 20px;
  padding: 44px 40px;
}

.auth-box .auth-logo {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--fg);
  text-decoration: none;
  display: block;
  margin-bottom: 32px;
}

.auth-box .auth-logo span { color: var(--accent-light); }

.auth-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.auth-subtitle { color: var(--fg-muted); font-size: 14px; margin-bottom: 28px; }

.auth-switch { text-align: center; margin-top: 20px; font-size: 14px; color: var(--fg-muted); }
.auth-switch a { color: var(--accent-light); text-decoration: none; }
.auth-switch a:hover { text-decoration: underline; }

/* ---- CATEGORY HEADER in skill list ---- */
.category-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--fg-muted);
  padding: 8px 0 4px;
  width: 100%;
}

/* ---- DASHBOARD STATS ---- */
.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 36px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: 14px;
  padding: 24px;
  text-align: center;
}

.stat-number {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 6px;
}

.stat-number.accent { color: var(--accent-light); }
.stat-number.teal   { color: var(--teal); }
.stat-number.gold   { color: var(--gold); }

.stat-label { color: var(--fg-muted); font-size: 13px; }

/* ---- MODAL ---- */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  z-index: 200;
  align-items: center;
  justify-content: center;
}

.modal-overlay.open { display: flex; }

.modal {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 20px;
  padding: 40px;
  max-width: 480px;
  width: 90%;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 16px; right: 16px;
  background: none;
  border: none;
  color: var(--fg-muted);
  font-size: 20px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
}

.modal-close:hover { background: rgba(255,255,255,0.06); color: var(--fg); }

/* ---- RESPONSIVE ---- */
@media (max-width: 640px) {
  .app-nav { padding: 0 16px; }
  .app-page { padding: 80px 16px 48px; }
  .auth-box { padding: 32px 24px; }
  .stats-row { grid-template-columns: 1fr; }
  .cards-grid { grid-template-columns: 1fr; }
  .session-card { flex-direction: column; }
}