/* Tip Calculator - scaffolded by the App Factory. Dark by default, theme-aware. */

:root {
  --bg: #0b0f14;
  --card: #131922;
  --text: #eef2f7;
  --dim: #8a97a8;
  --border: rgba(255, 255, 255, 0.12);
  --accent: #4f46e5;
  --accent-soft: rgba(79, 70, 229, 0.18);
  --track: rgba(255, 255, 255, 0.14);
}
:root[data-theme="light"] {
  --bg: #f4f6fa;
  --card: #ffffff;
  --text: #10151c;
  --dim: #5a6675;
  --border: rgba(0, 0, 0, 0.12);
  --accent-soft: rgba(79, 70, 229, 0.12);
  --track: rgba(0, 0, 0, 0.12);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
body { min-height: 100vh; min-height: 100dvh; }

.app {
  max-width: 640px;
  margin: 0 auto;
  padding: max(24px, env(safe-area-inset-top)) 20px calc(24px + env(safe-area-inset-bottom));
}

h1 { font-size: 26px; letter-spacing: -0.01em; margin: 8px 0 6px; }
.tagline { color: var(--dim); margin: 0 0 28px; font-size: 15px; }

.field-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: 8px;
}

/* Bill input */
.field { display: block; margin-bottom: 28px; }
.input-wrap {
  display: flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--card);
  padding: 0 16px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.input-wrap:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.prefix { font-size: 28px; color: var(--dim); padding-right: 4px; }
.bill-input {
  flex: 1;
  width: 100%;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font-size: 32px;
  font-weight: 600;
  padding: 14px 0;
  letter-spacing: -0.01em;
}
.bill-input::placeholder { color: var(--dim); opacity: 0.6; }

/* Tip block */
.tip-block {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--card);
  padding: 18px 18px 20px;
  margin-bottom: 24px;
}
.tip-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}
.tip-header .field-label { margin-bottom: 0; }
.tip-percent {
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.tip-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 28px;
  margin: 14px 0 4px;
  background: transparent;
  cursor: pointer;
}
/* Track */
.tip-slider::-webkit-slider-runnable-track {
  height: 8px;
  border-radius: 999px;
  background: var(--track);
}
.tip-slider::-moz-range-track {
  height: 8px;
  border-radius: 999px;
  background: var(--track);
}
/* Thumb */
.tip-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 26px;
  height: 26px;
  margin-top: -9px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid #fff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.35);
}
.tip-slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid #fff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.35);
}
.tip-slider:focus-visible::-webkit-slider-thumb { box-shadow: 0 0 0 4px var(--accent-soft); }
.tip-slider:focus-visible::-moz-range-thumb { box-shadow: 0 0 0 4px var(--accent-soft); }
.tip-slider:focus { outline: none; }

.tip-scale {
  display: flex;
  justify-content: space-between;
  color: var(--dim);
  font-size: 12px;
  margin-top: 2px;
}
.tip-amount { color: var(--dim); font-size: 15px; margin: 14px 0 0; }
.tip-amount strong { color: var(--text); font-weight: 600; }

/* Total */
.total-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-radius: 16px;
  padding: 20px 22px;
  background: linear-gradient(135deg, #5b52ea, var(--accent));
  color: #fff;
}
.total-label {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  opacity: 0.9;
}
.total-value {
  font-size: 34px;
  font-weight: 700;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
}