/* ── Variables ─────────────────────────────────────────────────────────────── */
:root {
  --bg:        #f3f4f6;
  --surface:   #ffffff;
  --surface2:  #f9fafb;
  --border:    #e5e7eb;
  --text:      #111827;
  --text2:     #6b7280;
  --petrol:    #3b82f6;
  --diesel:    #10b981;
  --elko:      #f59e0b;
  --up:        #ef4444;
  --down:      #22c55e;
  --radius:    14px;
  --shadow:    0 1px 3px rgba(0,0,0,.07), 0 4px 12px rgba(0,0,0,.05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:      #0d1117;
    --surface: #161b22;
    --surface2:#1c2333;
    --border:  #30363d;
    --text:    #e6edf3;
    --text2:   #7d8590;
    --shadow:  0 1px 3px rgba(0,0,0,.3), 0 4px 12px rgba(0,0,0,.25);
  }
}
:root[data-theme="dark"] {
  --bg:      #0d1117;
  --surface: #161b22;
  --surface2:#1c2333;
  --border:  #30363d;
  --text:    #e6edf3;
  --text2:   #7d8590;
  --shadow:  0 1px 3px rgba(0,0,0,.3), 0 4px 12px rgba(0,0,0,.25);
}
:root[data-theme="light"] {
  --bg:        #f3f4f6;
  --surface:   #ffffff;
  --surface2:  #f9fafb;
  --border:    #e5e7eb;
  --text:      #111827;
  --text2:     #6b7280;
  --shadow:    0 1px 3px rgba(0,0,0,.07), 0 4px 12px rgba(0,0,0,.05);
}

/* ── Reset ──────────────────────────────────────────────────────────────────── */
.hidden { display: none !important; }
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }

/* ── Header ─────────────────────────────────────────────────────────────────── */
header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
}
.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}
.header-logo { font-size: 1.6rem; font-weight: 700; letter-spacing: -.5px; }
.subtitle { color: var(--text2); font-size: .875rem; margin-top: 3px; }

/* ── Main ───────────────────────────────────────────────────────────────────── */
main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px 24px 48px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ── Price cards ────────────────────────────────────────────────────────────── */
.price-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
@media (max-width: 640px) {
  .price-cards { grid-template-columns: 1fr; }
}

.price-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px 18px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
  transition: transform .15s, box-shadow .15s;
}
.price-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0,0,0,.12);
}

.card-accent {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
}
#card-petrol .card-accent { background: var(--petrol); }
#card-diesel .card-accent { background: var(--diesel); }
#card-elko   .card-accent { background: var(--elko); }

.fuel-label {
  font-size: .72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--text2);
  margin-bottom: 10px;
}

.price-value {
  font-size: 2.1rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -.5px;
  line-height: 1;
}
.price-unit {
  font-size: .95rem;
  font-weight: 400;
  color: var(--text2);
}

.price-change {
  font-size: .82rem;
  font-weight: 500;
  margin-top: 8px;
}
.up   { color: var(--up); }
.down { color: var(--down); }
.flat { color: var(--text2); }

.price-date {
  font-size: .75rem;
  color: var(--text2);
  margin-top: 4px;
}

/* skeleton placeholders */
.skeleton    { color: transparent; background: var(--border); border-radius: 6px; }
.skeleton-sm { color: transparent; background: var(--border); border-radius: 4px; width: 60%; height: .8rem; margin-top: 8px; }

/* ── Upcoming alert ─────────────────────────────────────────────────────────── */
.upcoming-alert {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  box-shadow: var(--shadow);
  border-left: 4px solid transparent;
  font-size: .9rem;
  line-height: 1.55;
}
.upcoming-alert.up   { border-left-color: var(--up); }
.upcoming-alert.down { border-left-color: var(--down); }
.upcoming-alert.hidden { display: none; }
.upcoming-title { font-weight: 600; margin-bottom: 2px; }
.upcoming-body  { color: var(--text2); }
.upcoming-advice {
  display: inline-block;
  margin-top: 8px;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: .8rem;
  font-weight: 600;
}
.up   .upcoming-advice { background: #fef2f2; color: var(--up); }
.down .upcoming-advice { background: #f0fdf4; color: var(--down); }
@media (prefers-color-scheme: dark) {
  .up   .upcoming-advice { background: rgba(239,68,68,.15); }
  .down .upcoming-advice { background: rgba(34,197,94,.12); }
}

/* ── Chart ──────────────────────────────────────────────────────────────────── */
.chart-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  box-shadow: var(--shadow);
}

.chart-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 18px;
}

.fuel-toggles, .range-buttons {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.toggle-btn, .range-btn {
  padding: 5px 13px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text2);
  font-size: .8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all .15s;
}
.toggle-btn:hover, .range-btn:hover {
  background: var(--border);
  color: var(--text);
}

.toggle-btn[data-fuel="petrol"].active { background: var(--petrol); color: #fff; border-color: var(--petrol); }
.toggle-btn[data-fuel="diesel"].active { background: var(--diesel); color: #fff; border-color: var(--diesel); }
.toggle-btn[data-fuel="elko"].active   { background: var(--elko);   color: #fff; border-color: var(--elko); }
.range-btn.active { background: var(--text); color: var(--bg); border-color: var(--text); }

.chart-wrapper {
  position: relative;
  height: 360px;
}

/* ── Notifications ──────────────────────────────────────────────────────────── */
.notif-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.notif-intro {
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border);
}
.notif-intro h3 { font-size: .95rem; font-weight: 600; margin-bottom: 3px; }
.notif-intro p  { color: var(--text2); font-size: .83rem; }

.notif-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 24px;
  border-bottom: 1px solid var(--border);
}
.notif-option:last-child { border-bottom: none; }
.notif-option-label { font-size: .88rem; color: var(--text2); }

.notif-opt-btn {
  padding: 7px 14px;
  border-radius: 8px;
  border: 1px solid var(--down);
  background: var(--down);
  color: #fff;
  font-size: .8rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: opacity .15s;
  flex-shrink: 0;
}
.notif-opt-btn:hover { opacity: .82; }

.notif-active {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 24px;
  font-size: .88rem;
}
.notif-unsupported {
  padding: 16px 24px;
  font-size: .83rem;
  color: var(--text2);
}
.notif-ios-hint {
  font-weight: 700;
  color: var(--up);
  margin-top: 4px;
}

.notif-btn {
  padding: 9px 20px;
  border: none;
  border-radius: 9px;
  background: var(--text);
  color: var(--bg);
  font-size: .875rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: opacity .15s;
  flex-shrink: 0;
}
.notif-btn:hover      { opacity: .82; }
.notif-btn.subscribed { background: var(--down); color: #fff; }

@media (max-width: 560px) {
  .notif-option { flex-direction: column; align-items: flex-start; gap: 8px; }
  .notif-active { flex-direction: column; align-items: flex-start; }
}

/* ── Savings calculator ─────────────────────────────────────────────────────── */
.calc-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.calc-header {
  padding: 16px 24px 0;
  font-weight: 600;
  font-size: .95rem;
}
.calc-body {
  padding: 14px 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.calc-controls {
  display: flex;
  align-items: flex-end;
  gap: 20px;
  flex-wrap: wrap;
}
.calc-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.calc-field label {
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text2);
}
.calc-input-wrap {
  display: flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 9px;
  overflow: hidden;
  background: var(--surface2);
}
.calc-input-wrap input {
  width: 80px;
  padding: 8px 12px;
  border: none;
  background: transparent;
  color: var(--text);
  font-size: .95rem;
  font-weight: 600;
  outline: none;
}
.calc-unit {
  padding: 8px 12px 8px 0;
  color: var(--text2);
  font-size: .85rem;
}
.calc-fuel-btn {
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text2);
  font-size: .82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all .15s;
}
.calc-fuel-btn.active[data-fuel="petrol"] { background: var(--petrol); color: #fff; border-color: var(--petrol); }
.calc-fuel-btn.active[data-fuel="diesel"] { background: var(--diesel); color: #fff; border-color: var(--diesel); }
.calc-result {
  font-size: .95rem;
  min-height: 1.4em;
}
.calc-save strong { font-size: 1.15rem; }
.calc-save.up   { color: var(--up); }
.calc-save.down { color: var(--down); }

/* ── iOS install banner ─────────────────────────────────────────────────────── */
.install-banner {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  border-left: 4px solid var(--petrol);
  padding: 16px 20px 18px;
  box-shadow: var(--shadow);
}
.install-banner.hidden { display: none; }
.install-banner-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: .95rem;
  margin-bottom: 6px;
}
.install-close {
  background: none;
  border: none;
  color: var(--text2);
  font-size: 1rem;
  cursor: pointer;
  padding: 0 4px;
}
.install-sub {
  color: var(--text2);
  font-size: .83rem;
  margin-bottom: 14px;
}
.install-steps {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.install-steps li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .88rem;
}
.install-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--petrol);
  color: #fff;
  font-size: .72rem;
  font-weight: 700;
  flex-shrink: 0;
}

/* ── Footer ─────────────────────────────────────────────────────────────────── */
footer {
  text-align: center;
  color: var(--text2);
  font-size: .78rem;
  line-height: 1.8;
}
footer a:hover { text-decoration: underline; }

/* ── Theme select ────────────────────────────────────────────────────────────── */
.theme-select-wrap { margin-top: 12px; }
.theme-select {
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text2);
  font-size: .75rem;
  cursor: pointer;
  outline: none;
  appearance: auto;
}
.theme-select:hover { border-color: var(--text2); }