/* ==========================================================================
   SIMPLIX FLEET — UI THEME
   Web / PWA / hybrid app stylesheet + design-token reference for native apps
   Brand direction: essential, advanced, enterprise, fleet + maintenance + AI
   ========================================================================== */

:root {
  /* Brand */
  --sf-navy-950: #07182E;
  --sf-navy-900: #0B1F3B;
  --sf-navy-800: #12335D;
  --sf-blue-600: #2563FF;
  --sf-blue-500: #3478FF;
  --sf-blue-400: #4F8CFF;
  --sf-cyan-500: #06B6D4;
  --sf-cyan-400: #22C7E5;

  /* Neutrals */
  --sf-white: #FFFFFF;
  --sf-gray-25: #FCFDFE;
  --sf-gray-50: #F8FAFC;
  --sf-gray-100: #F1F5F9;
  --sf-gray-200: #E2E8F0;
  --sf-gray-300: #CBD5E1;
  --sf-gray-500: #64748B;
  --sf-gray-600: #475569;
  --sf-gray-700: #334155;
  --sf-gray-900: #0F172A;

  /* Semantic */
  --sf-success: #10B981;
  --sf-warning: #F59E0B;
  --sf-danger: #EF4444;
  --sf-info: #2563FF;

  /* Surfaces */
  --sf-bg: #F8FAFC;
  --sf-surface: #FFFFFF;
  --sf-surface-soft: #F1F5F9;
  --sf-surface-dark: #0B1F3B;
  --sf-border: #E2E8F0;
  --sf-border-strong: #CBD5E1;

  /* Text */
  --sf-text: #0B1F3B;
  --sf-text-secondary: #64748B;
  --sf-text-inverse: #FFFFFF;

  /* Gradient */
  --sf-gradient-brand: linear-gradient(135deg, #2563FF 0%, #06B6D4 100%);
  --sf-gradient-brand-deep: linear-gradient(135deg, #12335D 0%, #2563FF 55%, #06B6D4 100%);
  --sf-gradient-hero: linear-gradient(145deg, #07182E 0%, #0B1F3B 54%, #123E70 100%);

  /* Radius */
  --sf-radius-xs: 6px;
  --sf-radius-sm: 10px;
  --sf-radius-md: 14px;
  --sf-radius-lg: 18px;
  --sf-radius-xl: 24px;
  --sf-radius-pill: 999px;

  /* Shadows */
  --sf-shadow-xs: 0 1px 2px rgba(11,31,59,.05);
  --sf-shadow-sm: 0 4px 12px rgba(11,31,59,.08);
  --sf-shadow-md: 0 10px 30px rgba(11,31,59,.10);
  --sf-shadow-lg: 0 24px 60px rgba(11,31,59,.15);
  --sf-focus: 0 0 0 4px rgba(37,99,255,.14);

  /* Spacing */
  --sf-space-1: 4px;
  --sf-space-2: 8px;
  --sf-space-3: 12px;
  --sf-space-4: 16px;
  --sf-space-5: 20px;
  --sf-space-6: 24px;
  --sf-space-8: 32px;
  --sf-space-10: 40px;
  --sf-space-12: 48px;

  /* Layout */
  --sf-sidebar-width: 264px;
  --sf-header-height: 72px;
  --sf-content-max: 1540px;

  /* Typography */
  --sf-font: "Inter", "SF Pro Display", "SF Pro Text", -apple-system, BlinkMacSystemFont,
             "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --sf-font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;

  /* Motion */
  --sf-ease: cubic-bezier(.2,.8,.2,1);
  --sf-transition: 180ms var(--sf-ease);
}

/* Dark theme -------------------------------------------------------------- */
[data-theme="dark"] {
  --sf-bg: #07182E;
  --sf-surface: #0B1F3B;
  --sf-surface-soft: #12335D;
  --sf-border: rgba(255,255,255,.10);
  --sf-border-strong: rgba(255,255,255,.18);
  --sf-text: #F8FAFC;
  --sf-text-secondary: #A9B8CB;
  --sf-text-inverse: #07182E;
}

/* Reset / base ------------------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  color-scheme: light;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

html[data-theme="dark"] { color-scheme: dark; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--sf-font);
  color: var(--sf-text);
  background: var(--sf-bg);
  line-height: 1.45;
}

img { max-width: 100%; display: block; }
button, input, select, textarea { font: inherit; }

/* App shell --------------------------------------------------------------- */
.sf-app {
  min-height: 100vh;
  display: grid;
  grid-template-columns: var(--sf-sidebar-width) minmax(0, 1fr);
  background: var(--sf-bg);
}

.sf-sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: var(--sf-space-5);
  color: #fff;
  background: var(--sf-gradient-hero);
  border-right: 1px solid rgba(255,255,255,.08);
}

.sf-main { min-width: 0; }

.sf-topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  min-height: var(--sf-header-height);
  display: flex;
  align-items: center;
  gap: var(--sf-space-4);
  padding: 0 var(--sf-space-6);
  background: color-mix(in srgb, var(--sf-surface) 92%, transparent);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--sf-border);
}

.sf-content {
  width: min(100%, var(--sf-content-max));
  margin: 0 auto;
  padding: var(--sf-space-6);
}

/* Brand ------------------------------------------------------------------- */
.sf-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.sf-brand__symbol { width: 38px; height: 38px; object-fit: contain; }
.sf-brand__logo { height: 36px; width: auto; }

/* Sidebar navigation ------------------------------------------------------- */
.sf-nav {
  display: grid;
  gap: 6px;
  margin-top: var(--sf-space-8);
}

.sf-nav__item {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 46px;
  padding: 0 14px;
  border-radius: var(--sf-radius-sm);
  color: rgba(255,255,255,.74);
  text-decoration: none;
  font-weight: 600;
  transition: background var(--sf-transition), color var(--sf-transition),
              transform var(--sf-transition);
}

.sf-nav__item:hover {
  color: #fff;
  background: rgba(255,255,255,.08);
}

.sf-nav__item.is-active {
  color: #fff;
  background: linear-gradient(90deg, rgba(37,99,255,.92), rgba(37,99,255,.55));
  box-shadow: 0 8px 24px rgba(37,99,255,.24);
}

/* Typography --------------------------------------------------------------- */
.sf-title-xl {
  margin: 0;
  font-size: clamp(30px, 4vw, 54px);
  line-height: 1.05;
  letter-spacing: -.035em;
  font-weight: 800;
}

.sf-title-lg {
  margin: 0;
  font-size: clamp(24px, 2.2vw, 34px);
  line-height: 1.12;
  letter-spacing: -.025em;
  font-weight: 750;
}

.sf-title-md { font-size: 20px; line-height: 1.2; font-weight: 700; }
.sf-caption { color: var(--sf-text-secondary); font-size: 13px; }

/* Cards / dashboard -------------------------------------------------------- */
.sf-grid {
  display: grid;
  gap: var(--sf-space-4);
}

.sf-grid--kpi {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.sf-card {
  position: relative;
  background: var(--sf-surface);
  border: 1px solid var(--sf-border);
  border-radius: var(--sf-radius-lg);
  box-shadow: var(--sf-shadow-sm);
  overflow: hidden;
}

.sf-card__header {
  min-height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sf-space-4);
  padding: 0 var(--sf-space-5);
  border-bottom: 1px solid var(--sf-border);
}

.sf-card__body { padding: var(--sf-space-5); }

.sf-kpi {
  min-height: 126px;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 14px;
  padding: var(--sf-space-5);
}

.sf-kpi__icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  color: var(--sf-blue-600);
  background: rgba(37,99,255,.10);
}

.sf-kpi__value {
  font-size: 28px;
  line-height: 1;
  font-weight: 800;
  letter-spacing: -.03em;
}

.sf-kpi__label { margin-top: 5px; color: var(--sf-text-secondary); font-size: 13px; }

/* Buttons ----------------------------------------------------------------- */
.sf-btn {
  appearance: none;
  border: 0;
  border-radius: var(--sf-radius-sm);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 18px;
  cursor: pointer;
  font-weight: 700;
  text-decoration: none;
  transition: transform var(--sf-transition), box-shadow var(--sf-transition),
              background var(--sf-transition), border-color var(--sf-transition);
}

.sf-btn:hover { transform: translateY(-1px); }
.sf-btn:focus-visible { outline: none; box-shadow: var(--sf-focus); }

.sf-btn--primary {
  color: #fff;
  background: var(--sf-gradient-brand);
  box-shadow: 0 8px 20px rgba(37,99,255,.22);
}

.sf-btn--primary:hover { box-shadow: 0 12px 28px rgba(37,99,255,.28); }

.sf-btn--secondary {
  color: var(--sf-blue-600);
  background: var(--sf-surface);
  border: 1px solid rgba(37,99,255,.35);
}

.sf-btn--ghost {
  color: var(--sf-text);
  background: transparent;
}

.sf-btn--icon {
  width: 42px;
  padding: 0;
}

/* Form controls ------------------------------------------------------------ */
.sf-field {
  display: grid;
  gap: 7px;
}

.sf-label {
  font-size: 13px;
  font-weight: 650;
  color: var(--sf-text-secondary);
}

.sf-input,
.sf-select,
.sf-textarea {
  width: 100%;
  color: var(--sf-text);
  background: var(--sf-surface);
  border: 1px solid var(--sf-border-strong);
  border-radius: var(--sf-radius-sm);
  outline: none;
  transition: border-color var(--sf-transition), box-shadow var(--sf-transition);
}

.sf-input,
.sf-select {
  height: 44px;
  padding: 0 14px;
}

.sf-textarea {
  min-height: 120px;
  padding: 12px 14px;
  resize: vertical;
}

.sf-input:focus,
.sf-select:focus,
.sf-textarea:focus {
  border-color: var(--sf-blue-600);
  box-shadow: var(--sf-focus);
}

.sf-search {
  position: relative;
  max-width: 560px;
  flex: 1;
}

/* Status / maintenance ----------------------------------------------------- */
.sf-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 28px;
  padding: 0 10px;
  border-radius: var(--sf-radius-pill);
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

.sf-status::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
}

.sf-status--ok { color: #047857; background: #D1FAE5; }
.sf-status--warning { color: #B45309; background: #FEF3C7; }
.sf-status--danger { color: #B91C1C; background: #FEE2E2; }
.sf-status--info { color: #1D4ED8; background: #DBEAFE; }

/* Tables ------------------------------------------------------------------ */
.sf-table-wrap {
  width: 100%;
  overflow: auto;
  border: 1px solid var(--sf-border);
  border-radius: var(--sf-radius-md);
  background: var(--sf-surface);
}

.sf-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 760px;
}

.sf-table th,
.sf-table td {
  padding: 13px 16px;
  text-align: left;
  border-bottom: 1px solid var(--sf-border);
}

.sf-table th {
  color: var(--sf-text-secondary);
  background: var(--sf-gray-50);
  font-size: 12px;
  font-weight: 750;
  text-transform: uppercase;
  letter-spacing: .04em;
}

.sf-table tbody tr:hover { background: rgba(37,99,255,.035); }

/* Vehicle / asset cards ---------------------------------------------------- */
.sf-asset-card {
  display: grid;
  grid-template-columns: 112px 1fr auto;
  align-items: center;
  gap: var(--sf-space-4);
  padding: var(--sf-space-4);
}

.sf-asset-card__media {
  aspect-ratio: 4 / 3;
  border-radius: var(--sf-radius-md);
  background: var(--sf-gray-100);
  overflow: hidden;
}

.sf-asset-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* AI panel ---------------------------------------------------------------- */
.sf-ai-panel {
  color: #fff;
  background:
    radial-gradient(circle at 15% 20%, rgba(6,182,212,.20), transparent 34%),
    radial-gradient(circle at 90% 10%, rgba(37,99,255,.24), transparent 32%),
    var(--sf-gradient-hero);
  border: 1px solid rgba(255,255,255,.10);
}

.sf-ai-badge {
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding: 0 8px;
  border-radius: var(--sf-radius-pill);
  color: #B8F5FF;
  background: rgba(6,182,212,.14);
  border: 1px solid rgba(6,182,212,.25);
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .06em;
}

/* Marketing website -------------------------------------------------------- */
.sf-hero {
  position: relative;
  min-height: min(820px, 90vh);
  display: grid;
  align-items: center;
  color: #fff;
  background: var(--sf-gradient-hero);
  overflow: hidden;
}

.sf-hero::before {
  content: "";
  position: absolute;
  inset: -20%;
  pointer-events: none;
  background:
    radial-gradient(circle at 70% 40%, rgba(37,99,255,.25), transparent 28%),
    radial-gradient(circle at 25% 30%, rgba(6,182,212,.18), transparent 24%);
}

.sf-hero__inner {
  position: relative;
  width: min(100% - 40px, 1280px);
  margin: 0 auto;
  padding: 96px 0;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  align-items: center;
  gap: clamp(40px, 7vw, 100px);
}

.sf-hero__eyebrow {
  color: #8BEAFF;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.sf-hero__copy {
  max-width: 680px;
  color: rgba(255,255,255,.76);
  font-size: clamp(16px, 1.5vw, 20px);
}

.sf-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: var(--sf-space-5);
}

/* Mobile bottom navigation ------------------------------------------------- */
.sf-bottom-nav {
  display: none;
}

/* Utility ----------------------------------------------------------------- */
.sf-muted { color: var(--sf-text-secondary); }
.sf-gradient-text {
  color: transparent;
  background: var(--sf-gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
}
.sf-divider { height: 1px; background: var(--sf-border); border: 0; }

/* Responsive --------------------------------------------------------------- */
@media (max-width: 1180px) {
  .sf-grid--kpi { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .sf-feature-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .sf-hero__inner { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  :root { --sf-header-height: 64px; }

  .sf-app {
    display: block;
    padding-bottom: 74px;
  }

  .sf-sidebar { display: none; }

  .sf-content {
    padding: var(--sf-space-4);
  }

  .sf-topbar {
    padding: 0 var(--sf-space-4);
  }

  .sf-bottom-nav {
    position: fixed;
    left: 10px;
    right: 10px;
    bottom: calc(10px + env(safe-area-inset-bottom));
    z-index: 100;
    min-height: 62px;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    align-items: center;
    padding: 6px;
    border: 1px solid var(--sf-border);
    border-radius: 18px;
    background: color-mix(in srgb, var(--sf-surface) 94%, transparent);
    backdrop-filter: blur(18px);
    box-shadow: var(--sf-shadow-lg);
  }

  .sf-bottom-nav__item {
    display: grid;
    place-items: center;
    gap: 3px;
    min-height: 48px;
    color: var(--sf-text-secondary);
    text-decoration: none;
    font-size: 10px;
    font-weight: 700;
    border-radius: 12px;
  }

  .sf-bottom-nav__item.is-active {
    color: var(--sf-blue-600);
    background: rgba(37,99,255,.08);
  }
}

@media (max-width: 620px) {
  .sf-grid--kpi,
  .sf-feature-grid { grid-template-columns: 1fr; }

  .sf-card { border-radius: var(--sf-radius-md); }
  .sf-kpi { min-height: 104px; }

  .sf-hero__inner {
    width: min(100% - 28px, 1280px);
    padding: 72px 0;
  }
}

/* Accessibility / reduced motion ----------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}