/* ============================================================
   Vertigo Tracker — Light Mode Design System
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ── Variables ─────────────────────────────────────────────── */
:root {
  --bg:          #f4f6f9;
  --bg-card:     #ffffff;
  --bg-input:    #f0f2f5;
  --border:      #e1e5eb;
  --border-focus:#6366f1;

  --primary:     #6366f1;
  --primary-dim: #4f46e5;
  --cyan:        #0891b2;
  --success:     #16a34a;
  --warning:     #d97706;
  --danger:      #dc2626;

  --text:        #111827;
  --text-muted:  #6b7280;
  --text-dim:    #9ca3af;

  --morning:     #d97706;
  --noon:        #ea580c;
  --night:       #6366f1;
  --avg:         #0891b2;

  --radius:      12px;
  --radius-lg:   18px;
  --nav-h:       56px;

  --shadow:      0 2px 12px rgba(0,0,0,.08);
  --shadow-card: 0 1px 4px rgba(0,0,0,.06), 0 4px 16px rgba(0,0,0,.06);
}

/* ── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; -webkit-tap-highlight-color: transparent; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
  padding-bottom: calc(var(--nav-h) + 8px);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* ── Scrollbar ──────────────────────────────────────────────── */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

/* ── Page header ────────────────────────────────────────────── */
.page-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 8px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.page-header .app-name {
  font-size: 1rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}

.header-actions { display: flex; gap: 8px; align-items: center; }

.btn-icon {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  width: 36px; height: 36px;
  border-radius: 8px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  transition: all .2s;
}
.btn-icon:hover { border-color: var(--primary); color: var(--primary); background: rgba(99,102,241,.06); }

/* ── Bottom Navigation ──────────────────────────────────────── */
.bottom-nav {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--border);
  display: flex;
  z-index: 200;
}

.nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  color: var(--text-muted);
  font-size: .7rem;
  font-weight: 500;
  transition: color .2s;
  position: relative;
}

.nav-item::before {
  content: '';
  position: absolute;
  top: 0; left: 20%; right: 20%;
  height: 2px;
  background: var(--primary);
  border-radius: 0 0 4px 4px;
  transform: scaleX(0);
  transition: transform .2s;
}

.nav-item.active { color: var(--primary); }
.nav-item.active::before { transform: scaleX(1); }

.nav-icon { font-size: 1.4rem; line-height: 1; }
.nav-label { letter-spacing: .02em; }

/* ── Main content container ─────────────────────────────────── */
.container {
  max-width: 640px;
  margin: 0 auto;
  padding: 16px;
}

/* ── Card ───────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 12px;
  margin-bottom: 10px;
  box-shadow: var(--shadow-card);
}

/* ── Day Navigation ─────────────────────────────────────────── */
.day-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0 4px;
}

.day-nav-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  width: 44px; height: 44px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  transition: all .2s;
  flex-shrink: 0;
  text-decoration: none;
  box-shadow: var(--shadow);
}
.day-nav-btn:hover { border-color: var(--primary); color: var(--primary); background: rgba(99,102,241,.05); }
.day-nav-btn.disabled { opacity: .3; pointer-events: none; }

.day-label {
  text-align: center;
  flex: 1;
}
.day-label .date-text {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
}
.day-label .day-name {
  font-size: .78rem;
  color: var(--text-muted);
  margin-top: 2px;
}
.day-label .today-badge {
  display: inline-block;
  font-size: .65rem;
  font-weight: 600;
  background: var(--primary);
  color: #fff;
  border-radius: 999px;
  padding: 2px 8px;
  margin-top: 4px;
  letter-spacing: .04em;
  text-transform: uppercase;
}

/* ── Summary strip ──────────────────────────────────────────── */
.summary-strip {
  display: flex;
  gap: 4px;
  margin: 6px 0 10px;
}
.summary-pill {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 6px 2px 4px;
  text-align: center;
  box-shadow: var(--shadow-card);
}
.summary-pill .pill-icon {
  font-size: .9rem;
  display: block;
  margin-bottom: 2px;
}
.summary-pill .pill-label {
  font-size: .6rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--text-muted);
  display: block;
  margin-bottom: 2px;
}
.summary-pill .pill-val {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-dim);
}
.summary-pill.morning .pill-val { color: var(--morning); }
.summary-pill.noon    .pill-val { color: var(--noon); }
.summary-pill.night   .pill-val { color: var(--night); }
.summary-pill.avg     .pill-val { color: var(--avg); }

/* ── Score input ────────────────────────────────────────────── */
.score-group {
  margin-bottom: 10px;
}

.score-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: .06em;
}

.score-label .dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.dot-morning { background: var(--morning); }
.dot-noon    { background: var(--noon); }
.dot-night   { background: var(--night); }

.score-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.score-number {
  font-size: 1.4rem;
  font-weight: 800;
  min-width: 36px;
  text-align: center;
  color: var(--text);
  transition: color .3s;
}
.score-number.empty { color: var(--text-dim); font-size: 1rem; font-weight: 400; }

.score-slider-wrap { flex: 1; position: relative; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 999px;
  background: var(--bg-input);
  outline: none;
  cursor: pointer;
  transition: background .2s;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--primary);
  border: 3px solid #fff;
  box-shadow: 0 0 0 2px var(--primary), 0 2px 6px rgba(99,102,241,.3);
  cursor: pointer;
  transition: transform .15s, box-shadow .15s;
}
input[type="range"]:active::-webkit-slider-thumb {
  transform: scale(1.2);
  box-shadow: 0 0 0 4px rgba(99,102,241,.2), 0 2px 6px rgba(99,102,241,.3);
}
input[type="range"]::-moz-range-thumb {
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--primary);
  border: 3px solid #fff;
  cursor: pointer;
}

.score-clear-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  width: 24px; height: 24px;
  border-radius: 8px;
  cursor: pointer;
  font-size: .85rem;
  display: flex; align-items: center; justify-content: center;
  transition: all .2s;
  flex-shrink: 0;
}
.score-clear-btn:hover { border-color: var(--danger); color: var(--danger); background: rgba(220,38,38,.05); }

.range-ticks {
  display: flex;
  justify-content: space-between;
  padding: 4px 4px 0;
  font-size: .65rem;
  color: var(--text-dim);
}

/* Score colour feedback */
.color-great  { color: #16a34a !important; }
.color-good   { color: #65a30d !important; }
.color-ok     { color: #d97706 !important; }
.color-bad    { color: #ea580c !important; }
.color-awful  { color: #dc2626 !important; }

/* ── Notes textarea ─────────────────────────────────────────── */
.notes-textarea {
  width: 100%;
  min-height: 60px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: .9rem;
  padding: 8px 10px;
  resize: vertical;
  outline: none;
  transition: border-color .2s, box-shadow .2s;
}
.notes-textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(99,102,241,.1);
  background: #fff;
}
.notes-textarea::placeholder { color: var(--text-dim); }

/* ── Save button ────────────────────────────────────────────── */
.btn-save {
  width: 100%;
  padding: 12px;
  border-radius: var(--radius);
  border: none;
  background: linear-gradient(135deg, var(--primary), var(--primary-dim));
  color: #fff;
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  box-shadow: 0 4px 16px rgba(99,102,241,.3);
  position: relative;
}
.btn-save:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(99,102,241,.4); }
.btn-save:active { transform: translateY(0); }
.btn-save.loading { pointer-events: none; opacity: .7; }
.btn-save.saved { background: linear-gradient(135deg, var(--success), #15803d); box-shadow: 0 4px 16px rgba(22,163,74,.3); }

/* ── Toast notification ─────────────────────────────────────── */
.toast {
  position: fixed;
  top: 72px; left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 20px;
  font-size: .9rem;
  font-weight: 500;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: all .3s;
  z-index: 500;
  white-space: nowrap;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.success { border-color: var(--success); color: var(--success); }
.toast.error   { border-color: var(--danger);  color: var(--danger); }

/* ── Section title ──────────────────────────────────────────── */
.section-title {
  font-size: .72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-muted);
  margin-bottom: 14px;
}

/* ── Charts page ────────────────────────────────────────────── */
.chart-range-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.range-btn {
  flex: 1;
  min-width: 60px;
  padding: 8px 4px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-muted);
  font-family: 'Inter', sans-serif;
  font-size: .8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all .2s;
  text-align: center;
}
.range-btn.active,
.range-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(99,102,241,.07);
}

.chart-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px;
  margin-bottom: 14px;
  box-shadow: var(--shadow-card);
}
.chart-card-title {
  font-size: .8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text-muted);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.chart-card-title .legend-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
}
.chart-container {
  position: relative;
  height: 180px;
}

/* ── Login page ─────────────────────────────────────────────── */
.login-page {
  min-height: 100dvh;
  padding-bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(99,102,241,.07) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(8,145,178,.05) 0%, transparent 50%),
    var(--bg);
}

.login-card {
  width: 100%;
  max-width: 380px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  box-shadow: 0 4px 32px rgba(0,0,0,.1);
}

.login-logo {
  text-align: center;
  margin-bottom: 8px;
  font-size: 2.8rem;
}

.login-title {
  text-align: center;
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 4px;
  background: linear-gradient(135deg, var(--primary), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.login-subtitle {
  text-align: center;
  font-size: .85rem;
  color: var(--text-muted);
  margin-bottom: 28px;
}

.form-group { margin-bottom: 16px; }

.form-label {
  display: block;
  font-size: .8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
  letter-spacing: .03em;
}

.form-input {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  padding: 12px 14px;
  outline: none;
  transition: border-color .2s, box-shadow .2s;
}
.form-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,.12);
  background: #fff;
}

.remember-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 4px 0 20px;
  font-size: .88rem;
  color: var(--text-muted);
  cursor: pointer;
}
.remember-row input[type="checkbox"] {
  width: 18px; height: 18px;
  accent-color: var(--primary);
  cursor: pointer;
}

.btn-login {
  width: 100%;
  padding: 14px;
  border-radius: var(--radius);
  border: none;
  background: linear-gradient(135deg, var(--primary), var(--primary-dim));
  color: #fff;
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  box-shadow: 0 4px 16px rgba(99,102,241,.3);
}
.btn-login:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(99,102,241,.4); }
.btn-login:active { transform: translateY(0); }

.error-msg {
  background: rgba(220,38,38,.06);
  border: 1px solid rgba(220,38,38,.2);
  border-radius: var(--radius);
  color: #b91c1c;
  padding: 10px 14px;
  font-size: .88rem;
  margin-bottom: 16px;
  text-align: center;
}

/* ── Responsive — tablet+ ───────────────────────────────────── */
@media (min-width: 640px) {
  .container { padding: 24px; }
  .chart-container { height: 220px; }
}

/* ── Empty state ─────────────────────────────────────────────── */
.empty-charts {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-muted);
  font-size: .95rem;
}
.empty-charts .empty-icon { font-size: 3rem; display: block; margin-bottom: 12px; }