/* ============================================================================
 * Sicosa Fuel Cost Calculator — UI styles
 * ============================================================================ */

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  color: var(--fg-1);
  background: var(--bg-page);
  -webkit-font-smoothing: antialiased;
  font-size: 14px;
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4, p { margin: 0; }
button { font: inherit; cursor: pointer; }
input, textarea, select { font: inherit; }

/* ─── Header ────────────────────────────────────────────────────────── */
.app-header {
  background: #fff;
  border-bottom: 1px solid var(--border-1);
  padding: 18px 36px;
  display: flex;
  align-items: center;
  gap: 20px;
  position: sticky;
  top: 0;
  z-index: 40;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand--link {
  text-decoration: none;
  color: inherit;
  transition: opacity 150ms ease;
  -webkit-tap-highlight-color: transparent;
}
.brand--link:hover { opacity: 0.75; }
.brand__mark { width: 38px; height: 38px; border-radius: 999px; }
.brand__text { display: flex; flex-direction: column; line-height: 1; }
.brand__wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--navy-800);
  letter-spacing: -0.02em;
}
.brand__sub {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--sky-400);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin-top: 4px;
}
.app-header__divider { height: 28px; width: 1px; background: var(--border-1); }
.app-title { display: flex; flex-direction: column; }
.app-title__h {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--navy-800);
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.app-title__sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--fg-3);
  letter-spacing: 0.10em;
  text-transform: uppercase;
  margin-top: 4px;
}
.header__right { margin-left: auto; display: flex; gap: 10px; align-items: center; }

/* ─── Buttons ───────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-weight: 600; letter-spacing: -0.005em;
  border-radius: 8px;
  border: none;
  transition: background var(--dur-base) var(--ease-out), color var(--dur-base) var(--ease-out), border-color var(--dur-fast) var(--ease-out), transform var(--dur-fast);
  white-space: nowrap;
  cursor: pointer;
  height: 38px; padding: 0 16px; font-size: 13.5px;
}
.btn i { width: 15px; height: 15px; }
.btn--primary { background: var(--sky-400); color: #fff; box-shadow: var(--shadow-xs); }
.btn--primary:hover { background: var(--sky-500); box-shadow: var(--shadow-sm); }
.btn--primary:active { transform: scale(0.98); }
.btn--ghost { background: #fff; color: var(--navy-800); border: 1px solid var(--border-2); }
.btn--ghost:hover { background: var(--bg-tint-navy); border-color: var(--border-3); }
.btn--lg { height: 46px; padding: 0 22px; font-size: 14px; }
.btn--sm { height: 32px; padding: 0 12px; font-size: 12.5px; }

/* ─── Layout ────────────────────────────────────────────────────────── */
.canvas {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 28px 36px 72px;
}
.canvas__intro {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 32px;
  margin-bottom: 22px;
}
.intro__eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sky-400);
  margin-bottom: 10px;
}
.intro__h {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--navy-800);
  max-width: 720px;
}
.intro__p { margin-top: 10px; color: var(--fg-2); font-size: 14px; line-height: 1.55; max-width: 580px; }
.intro__meta { display: flex; flex-direction: column; gap: 4px; align-items: flex-end; text-align: right; }
.intro__meta-row {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-3);
}
.intro__meta-row strong { color: var(--navy-800); font-weight: 500; }

/* ─── Fuel selector ─────────────────────────────────────────────────── */
.fuel-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}
.fuel-card {
  display: flex; align-items: center; gap: 14px;
  padding: 16px 18px;
  background: #fff;
  border: 1.5px solid var(--border-1);
  border-radius: 12px;
  cursor: pointer;
  transition: border-color var(--dur-fast), transform var(--dur-fast), box-shadow var(--dur-fast);
  text-align: left;
  position: relative;
  overflow: hidden;
}
.fuel-card:hover { border-color: var(--border-3); box-shadow: var(--shadow-sm); }
.fuel-card.is-active {
  border-color: var(--sky-400);
  background: var(--bg-tint-sky);
  box-shadow: 0 0 0 3px rgba(42,136,193,0.12), var(--shadow-sm);
}
.fuel-card__chip {
  width: 44px; height: 44px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.04em;
  flex-shrink: 0;
}
.fuel-card__text { display: flex; flex-direction: column; }
.fuel-card__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  color: var(--navy-800);
  letter-spacing: -0.01em;
}
.fuel-card__density {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--fg-2);
  margin-top: 2px;
}

/* ─── Two-column dashboard ──────────────────────────────────────────── */
.dash {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 440px;
  gap: 24px;
  align-items: start;
}

/* ─── Card surface ──────────────────────────────────────────────────── */
.card {
  background: #fff;
  border: 1px solid var(--border-1);
  border-radius: 14px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.card__head {
  padding: 18px 22px 14px;
  border-bottom: 1px solid var(--border-1);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}
.card__title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--navy-800);
  letter-spacing: -0.02em;
}
.card__sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-top: 4px;
}
.card__body { padding: 22px; }
.card__body--tight { padding: 14px 22px 22px; }

/* Mode tabs */
.mode-tabs { display: inline-flex; gap: 2px; padding: 3px; background: var(--bg-page); border-radius: 8px; border: 1px solid var(--border-1); }
.mode-tab {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-2);
  background: transparent;
  border: none;
  padding: 7px 12px;
  border-radius: 5px;
}
.mode-tab.is-active { background: #fff; color: var(--navy-800); box-shadow: var(--shadow-xs); }

/* ─── Form fields ───────────────────────────────────────────────────── */
.fields { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.field--full { grid-column: 1 / -1; }
.field__label {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-2);
}
.field__hint {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--fg-3);
  letter-spacing: 0.06em;
  text-transform: none;
  font-weight: 400;
}
.field__input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}
.input {
  width: 100%;
  height: 46px;
  padding: 0 14px;
  border: 1px solid var(--border-2);
  border-radius: 9px;
  background: #fff;
  font-size: 16px;
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
  color: var(--navy-800);
  font-weight: 500;
  outline: none;
  transition: border-color var(--dur-fast), box-shadow var(--dur-fast);
}
.input:focus { border-color: var(--sky-400); box-shadow: 0 0 0 3px rgba(42,136,193,0.16); }
.input.is-invalid { border-color: var(--status-error); box-shadow: 0 0 0 3px rgba(179,66,47,0.12); }
.input__suffix {
  position: absolute;
  right: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-3);
  pointer-events: none;
}
.input--has-suffix { padding-right: 70px; }
.input--has-suffix-wide { padding-right: 96px; }
.field__error { font-family: var(--font-mono); font-size: 11px; color: var(--status-error); letter-spacing: 0.04em; margin-top: 4px; }

/* Toggle row */
.toggle-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border: 1px solid var(--border-1);
  border-radius: 10px;
  background: var(--bg-page);
  margin-top: 6px;
}
.toggle-row__text { display: flex; flex-direction: column; gap: 2px; }
.toggle-row__h { font-weight: 600; color: var(--navy-800); font-size: 13.5px; }
.toggle-row__sub { font-family: var(--font-mono); font-size: 11px; color: var(--fg-2); letter-spacing: 0.04em; }
.toggle {
  position: relative;
  width: 42px; height: 24px;
  background: var(--border-3);
  border-radius: 999px;
  border: none;
  cursor: pointer;
  flex-shrink: 0;
  transition: background var(--dur-fast);
}
.toggle::after {
  content: ""; position: absolute;
  top: 2px; left: 2px;
  width: 20px; height: 20px;
  background: #fff;
  border-radius: 999px;
  box-shadow: var(--shadow-xs);
  transition: transform var(--dur-fast);
}
.toggle.is-on { background: var(--sky-400); }
.toggle.is-on::after { transform: translateX(18px); }

/* ─── Advanced panel ────────────────────────────────────────────────── */
.advanced { padding: 22px; border-top: 1px solid var(--border-1); background: var(--bg-page); }
.advanced__head { display: flex; align-items: center; gap: 10px; cursor: pointer; user-select: none; }
.advanced__chev { width: 14px; height: 14px; color: var(--fg-2); transition: transform var(--dur-fast); }
.advanced.is-open .advanced__chev { transform: rotate(90deg); }
.advanced__h { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--fg-2); font-weight: 500; }
.advanced__body { margin-top: 14px; display: none; }
.advanced.is-open .advanced__body { display: block; }

.const-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--border-1); border-radius: 10px; overflow: hidden; border: 1px solid var(--border-1); }
.const-cell { background: #fff; padding: 12px 14px; }
.const-cell__label { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--fg-3); }
.const-cell__val { font-family: var(--font-mono); font-size: 13px; font-weight: 600; color: var(--navy-800); margin-top: 4px; letter-spacing: 0.02em; }
.const-cell__note { font-size: 11px; color: var(--fg-2); margin-top: 2px; }

.breakdown { margin-top: 14px; padding: 16px; background: #fff; border: 1px solid var(--border-1); border-radius: 10px; }
.breakdown__h { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--fg-2); margin-bottom: 10px; font-weight: 500; }
.breakdown__row { display: grid; grid-template-columns: 1fr auto auto; gap: 12px; padding: 8px 0; border-top: 1px dashed var(--border-1); align-items: baseline; font-size: 13px; }
.breakdown__row:first-of-type { border-top: none; }
.breakdown__k { color: var(--fg-1); font-weight: 500; }
.breakdown__sub { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.06em; color: var(--fg-3); text-transform: uppercase; }
.breakdown__v { font-family: var(--font-mono); font-weight: 600; color: var(--navy-800); letter-spacing: 0.02em; text-align: right; }
.breakdown__row--total { border-top: 1px solid var(--border-2); margin-top: 6px; padding-top: 12px; }
.breakdown__row--total .breakdown__k { font-family: var(--font-display); font-weight: 700; font-size: 14px; color: var(--navy-800); letter-spacing: -0.01em; }
.breakdown__row--total .breakdown__v { font-size: 15px; }

/* ─── Results panel ─────────────────────────────────────────────────── */
.result {
  position: sticky;
  top: 92px;
  background: var(--navy-800);
  color: #fff;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255,255,255,0.04);
}
.result__head {
  padding: 20px 24px 14px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 14px;
  border-bottom: 1px solid var(--border-on-dark);
}
.result__eyebrow {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg-on-dark-3);
}
.result__title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  margin-top: 2px;
  color: #fff;
  letter-spacing: -0.01em;
}
.result__live {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #6ed59a;
}
.result__live-dot { width: 6px; height: 6px; border-radius: 999px; background: #6ed59a; box-shadow: 0 0 0 3px rgba(110,213,154,0.22); animation: r-pulse 1.8s ease-in-out infinite; }
@keyframes r-pulse { 50% { box-shadow: 0 0 0 7px rgba(110,213,154,0); } }

/* Priority stat */
.priority { padding: 20px 24px 22px; display: flex; flex-direction: column; gap: 14px; }
.prio-stat {
  display: flex;
  flex-direction: column;
}
.prio-stat--main {
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-on-dark);
}
.prio-stat__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg-on-dark-3);
}
.prio-stat__line { display: flex; align-items: baseline; gap: 10px; margin-top: 6px; flex-wrap: wrap; }
.prio-stat__val {
  font-family: var(--font-mono);
  font-size: 44px;
  font-weight: 500;
  color: #fff;
  letter-spacing: -0.02em;
  line-height: 1;
}
.prio-stat--secondary .prio-stat__val { font-size: 24px; font-weight: 500; }
.prio-stat__unit {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--fg-on-dark-2);
  letter-spacing: 0.04em;
}
.prio-stat__sub {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-on-dark-2);
  letter-spacing: 0.04em;
  margin-top: 4px;
}
.prio-stat__sub span { color: #fff; }

.prio-stat--profit.is-positive .prio-stat__val { color: #6ed59a; }
.prio-stat--profit.is-negative .prio-stat__val { color: #f08372; }

.priority__row2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  padding-top: 4px;
}

/* Result metrics list (long form) */
.metrics {
  border-top: 1px solid var(--border-on-dark);
  padding: 16px 24px 18px;
  background: rgba(255,255,255,0.02);
}
.metrics__h { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--fg-on-dark-3); margin-bottom: 8px; }
.metrics__row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 12px;
  align-items: baseline;
  padding: 7px 0;
  border-top: 1px dashed rgba(255,255,255,0.07);
}
.metrics__row:first-of-type { border-top: none; }
.metrics__k { font-size: 12.5px; color: var(--fg-on-dark-2); }
.metrics__v-amd { font-family: var(--font-mono); font-size: 12.5px; color: #fff; font-weight: 500; letter-spacing: 0.02em; text-align: right; min-width: 100px; }
.metrics__v-usd { font-family: var(--font-mono); font-size: 11px; color: var(--fg-on-dark-3); letter-spacing: 0.04em; min-width: 64px; text-align: right; }
.metrics__row.is-section .metrics__k { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--sky-300); padding-top: 6px; }

.metrics__row.is-positive .metrics__v-amd { color: #6ed59a; }
.metrics__row.is-negative .metrics__v-amd { color: #f08372; }

/* Actions */
.result__actions {
  padding: 16px 22px 20px;
  border-top: 1px solid var(--border-on-dark);
  display: flex;
  gap: 10px;
}
.btn--dark-ghost {
  background: rgba(255,255,255,0.06);
  color: #fff;
  border: 1px solid var(--border-on-dark-2);
}
.btn--dark-ghost:hover { background: rgba(255,255,255,0.12); }

.result__notes {
  padding: 12px 24px 18px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--fg-on-dark-3);
  letter-spacing: 0.04em;
  line-height: 1.55;
}

/* ─── Toast ─────────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--navy-800);
  color: #fff;
  padding: 12px 20px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 500;
  box-shadow: var(--shadow-xl);
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 1000;
  animation: toast-in 0.3s var(--ease-out);
}
.toast i { width: 16px; height: 16px; color: #6ed59a; }
@keyframes toast-in {
  from { opacity: 0; transform: translate(-50%, 8px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* ─── Responsive ────────────────────────────────────────────────────── */
@media (max-width: 1100px) {
  .dash { grid-template-columns: 1fr; }
  .result { position: static; }
  .fuel-bar { grid-template-columns: repeat(2, 1fr); }
  /* Mobile/2-column row order: Diesel + LPG on top, Gasolines below */
  .fuel-card--diesel      { order: 1; }
  .fuel-card--lpg         { order: 2; }
  .fuel-card--gasoline-92 { order: 3; }
  .fuel-card--gasoline-95 { order: 4; }
}
@media (max-width: 700px) {
  .app-header { padding: 14px 18px; gap: 12px; flex-wrap: wrap; }
  .header__right {
    width: 100%;
    margin-left: 0;
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 8px;
  }
  .canvas { padding: 24px 16px 60px; }
  .canvas__intro { flex-direction: column; align-items: flex-start; }
  .intro__h { font-size: 24px; }
  .intro__meta { align-items: flex-start; text-align: left; }
  .fields { grid-template-columns: 1fr; }
  .const-grid { grid-template-columns: 1fr; }
  .prio-stat__val { font-size: 34px; }
}

/* ─── Print / PDF stylesheet ────────────────────────────────────────── */
.print-doc { display: none; }
@media print {
  html, body { margin: 0 !important; padding: 0 !important; background: #fff; }
  /* Hide every non-print UI element. The gate is position:fixed inset:0 —
     even invisible it would otherwise create an extra blank page in print. */
  .app-header, .canvas, .toast, .gate { display: none !important; }
  .print-doc {
    display: block !important;
    padding: 14mm 14mm !important;
    margin: 0 !important;
    box-sizing: border-box;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }
  /* Force ALL backgrounds/colors to print regardless of the user's
     "Background graphics" checkbox in the print dialog. */
  .print-doc * {
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
    color-adjust: exact !important;
  }
  /* Trim any trailing margin that could push content past A4. */
  .print-doc > *:last-child { margin-bottom: 0 !important; }
  /* margin: 0 leaves no room for browser headers/footers (URL, date, page #). */
  @page { size: A4; margin: 0; }
}

/* ============================================================================
 * iPhone / mobile refinements (added at integration time)
 * ============================================================================ */

/* Sticky header respects iPhone notch + Dynamic Island */
.app-header {
  padding-top: max(18px, env(safe-area-inset-top));
}

/* Result panel: avoid bottom-edge cut-off on iPhone home indicator */
.result {
  padding-bottom: max(20px, env(safe-area-inset-bottom));
}

/* Touch-friendly buttons everywhere */
.btn { -webkit-tap-highlight-color: transparent; }

/* Larger tap targets on small screens */
@media (max-width: 480px) {
  .btn { min-height: 44px; }
  .input { height: 50px; font-size: 16px; }    /* 16px → no iOS auto-zoom */
  .fuel-card { min-height: 76px; }
  .app-header { padding-left: 14px; padding-right: 14px; }
  .canvas { padding-left: 14px !important; padding-right: 14px !important; }
  .intro__h { font-size: 22px; line-height: 1.18; }
  .prio-stat__val { font-size: 30px; }
  .header__right { margin-left: 0; justify-content: flex-start; }
}

/* Fixed-costs toggle inside Advanced panel "const-cell" — absolute top-right,
 * label keeps the standard layout used by every other const-cell. */
.const-cell--toggle { position: relative; padding-right: 48px; }
.const-cell__toggle {
  position: absolute;
  top: 12px;
  right: 14px;
  width: 32px;
  height: 18px;
}
.const-cell__toggle::after {
  width: 14px; height: 14px;
  top: 2px; left: 2px;
}
.const-cell__toggle.is-on::after { transform: translateX(14px); }

/* Editable const-cell (Customs duty) — inline numeric input replaces .const-cell__val */
.const-cell__edit {
  display: flex; align-items: baseline; gap: 6px; margin-top: 4px;
}
.const-cell__input {
  width: 88px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--navy-800);
  letter-spacing: 0.02em;
  background: rgba(20, 32, 49, 0.04);
  border: 1px solid rgba(20, 32, 49, 0.12);
  border-radius: 6px;
  padding: 4px 8px;
  outline: none;
  transition: border-color 160ms ease, background 160ms ease;
}
.const-cell__input:focus {
  border-color: var(--c-sky, #2a88c1);
  background: #fff;
}
.const-cell__unit {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-2);
  letter-spacing: 0.04em;
}

/* Smooth scrolling on iOS */
html { -webkit-overflow-scrolling: touch; }