/* =============================================
   Atlas Route Planner — styles.css
   Art direction: Aviation tool → precise, dark, monochromatic
   Palette: deep neutrals + teal accent
   Typography: Inter (body) + JetBrains Mono (codes)
   Density: compact/balanced for a planning tool
   ============================================= */

/* --- DESIGN TOKENS --- */
:root {
  /* Type scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.4rem;
  --radius-lg: 0.625rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition: 160ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Fonts */
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Mono', monospace;

  /* Content */
  --header-height: 52px;
  --sidebar-width: 280px;
}

/* --- LIGHT MODE --- */
:root, [data-theme="light"] {
  --color-bg:              #f5f4f0;
  --color-surface:         #faf9f7;
  --color-surface-2:       #ffffff;
  --color-surface-offset:  #edecea;
  --color-divider:         #dddbd7;
  --color-border:          #d0ceca;
  --color-text:            #1e1c18;
  --color-text-muted:      #72706b;
  --color-text-faint:      #b0aea9;
  --color-primary:         #016970;
  --color-primary-hover:   #014e54;
  --color-primary-bg:      #d4e8e9;
  --color-success:         #3a7320;
  --color-success-bg:      #d4e2cc;
  --color-warning:         #8b4513;
  --color-warning-bg:      #e5d5c8;
  --color-error:           #991b3e;
  --color-error-bg:        #e8d0d8;
  --color-neutral-bg:      #e4e2de;
  --shadow-sm: 0 1px 3px oklch(0.2 0.01 80 / 0.07);
  --shadow-md: 0 4px 14px oklch(0.2 0.01 80 / 0.09);
}
/* =============================================
   Atlas Route Planner — styles.css
   Art direction: Aviation tool → precise, dark, monochromatic
   Palette: deep neutrals + teal accent
   Typography: Inter (body) + JetBrains Mono (codes)
   Density: compact/balanced for a planning tool
   ============================================= */

/* --- DESIGN TOKENS --- */
:root {
  /* Type scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.4rem;
  --radius-lg: 0.625rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition: 160ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Fonts */
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Mono', monospace;

  /* Content */
  --header-height: 52px;
  --sidebar-width: 280px;
}

/* --- LIGHT MODE --- */
:root, [data-theme="light"] {
  --color-bg:              #f5f4f0;
  --color-surface:         #faf9f7;
  --color-surface-2:       #ffffff;
  --color-surface-offset:  #edecea;
  --color-divider:         #dddbd7;
  --color-border:          #d0ceca;
  --color-text:            #1e1c18;
  --color-text-muted:      #72706b;
  --color-text-faint:      #b0aea9;
  --color-primary:         #016970;
  --color-primary-hover:   #014e54;
  --color-primary-bg:      #d4e8e9;
  --color-success:         #3a7320;
  --color-success-bg:      #d4e2cc;
  --color-warning:         #8b4513;
  --color-warning-bg:      #e5d5c8;
  --color-error:           #991b3e;
  --color-error-bg:        #e8d0d8;
  --color-neutral-bg:      #e4e2de;
  --shadow-sm: 0 1px 3px oklch(0.2 0.01 80 / 0.07);
  --shadow-md: 0 4px 14px oklch(0.2 0.01 80 / 0.09);
}

/* --- DARK MODE --- */
[data-theme="dark"] {
  --color-bg:              #141312;
  --color-surface:         #1a1917;
  --color-surface-2:       #1f1e1c;
  --color-surface-offset:  #242220;
  --color-divider:         #2a2826;
  --color-border:          #333130;
  --color-text:            #d4d2ce;
  --color-text-muted:      #7a7874;
  --color-text-faint:      #4e4c48;
  --color-primary:         #4a96a2;
  --color-primary-hover:   #6ab3be;
  --color-primary-bg:      #1e3235;
  --color-success:         #5c9e3a;
  --color-success-bg:      #1e2d17;
  --color-warning:         #c4763a;
  --color-warning-bg:      #2e1f10;
  --color-error:           #c4476a;
  --color-error-bg:        #2c1019;
  --color-neutral-bg:      #2c2a28;
  --shadow-sm: 0 1px 3px oklch(0 0 0 / 0.25);
  --shadow-md: 0 4px 14px oklch(0 0 0 / 0.35);
}

/* --- BASE RESET --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}
body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text);
  background: var(--color-bg);
  overflow: hidden;
}
img, svg { display: block; }
input, button, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }
textarea { resize: vertical; }
ul[role="list"] { list-style: none; }
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* --- APP SHELL --- */
.app-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-height);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-divider);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-4);
  gap: var(--space-4);
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-primary);
  flex-shrink: 0;
}

.app-name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.header-stats {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex: 1;
  justify-content: center;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
}

.stat-value {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}

.stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  line-height: 1;
}

.stat-divider {
  width: 1px;
  height: 28px;
  background: var(--color-divider);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.btn-icon {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: background var(--transition), color var(--transition);
}
.btn-icon:hover {
  background: var(--color-surface-offset);
  color: var(--color-text);
}
.btn-icon:active { background: var(--color-divider); }

/* --- LAYOUT --- */
.app-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  height: calc(100dvh - var(--header-height));
  margin-top: var(--header-height);
  overflow: hidden;
}

/* --- LEG LIST PANEL --- */
.leg-list-panel {
  background: var(--color-surface);
  border-right: 1px solid var(--color-divider);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.panel-header {
  padding: var(--space-4) var(--space-4) var(--space-3);
  border-bottom: 1px solid var(--color-divider);
  flex-shrink: 0;
}

.panel-title {
  display: block;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-1);
}

.panel-subtitle {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.leg-list {
  overflow-y: auto;
  flex: 1;
  padding: var(--space-2) 0;
}

/* --- LEG LIST ITEM --- */
.leg-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  cursor: pointer;
  transition: background var(--transition);
  border-left: 2px solid transparent;
  min-height: 44px;
}
.leg-item:hover { background: var(--color-surface-offset); }
.leg-item.selected {
  background: var(--color-primary-bg);
  border-left-color: var(--color-primary);
}

.leg-item-seq {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-variant-numeric: tabular-nums;
  width: 18px;
  flex-shrink: 0;
  font-family: var(--font-mono);
}

.leg-item-route {
  flex: 1;
  min-width: 0;
}

.leg-item-airports {
  font-size: var(--text-xs);
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.leg-item-date {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-top: 1px;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
  transition: background var(--transition);
}
.status-dot[data-status="planned"]     { background: var(--color-text-faint); }
.status-dot[data-status="in-progress"] { background: var(--color-warning); }
.status-dot[data-status="flown"]       { background: var(--color-success); }
.status-dot[data-status="cancelled"]   { background: var(--color-error); }

/* --- LEG DETAIL PANEL --- */
.leg-detail-panel {
  background: var(--color-bg);
  overflow-y: auto;
  padding: var(--space-6);
}

/* --- EMPTY STATE --- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  height: 100%;
  min-height: 300px;
  color: var(--color-text-faint);
  text-align: center;
}
.empty-state p {
  font-size: var(--text-sm);
  max-width: 28ch;
}

/* --- LEG FORM --- */
.leg-form { max-width: 620px; }
.hidden { display: none !important; }

.form-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-divider);
}

.leg-route-display {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-primary);
}

.leg-dep-display,
.leg-arr-display {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

/* --- STATUS BUTTONS --- */
.status-buttons {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.status-btn {
  font-size: var(--text-xs);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-muted);
  font-weight: 500;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.status-btn:hover {
  background: var(--color-surface-offset);
  color: var(--color-text);
}
.status-btn.active[data-status="planned"] {
  background: var(--color-neutral-bg);
  color: var(--color-text);
  border-color: transparent;
}
.status-btn.active[data-status="in-progress"] {
  background: var(--color-warning-bg);
  color: var(--color-warning);
  border-color: transparent;
}
.status-btn.active[data-status="flown"] {
  background: var(--color-success-bg);
  color: var(--color-success);
  border-color: transparent;
}
.status-btn.active[data-status="cancelled"] {
  background: var(--color-error-bg);
  color: var(--color-error);
  border-color: transparent;
}

/* --- FORM GRID --- */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4) var(--space-5);
  margin-bottom: var(--space-5);
}

.field-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.field-group.full-width {
  grid-column: 1 / -1;
  margin-bottom: var(--space-5);
}

label {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

input[type="text"],
input[type="date"],
input[type="time"],
input[type="number"],
textarea {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text);
  width: 100%;
  transition: border-color var(--transition), box-shadow var(--transition);
}
input[type="text"]:focus,
input[type="date"]:focus,
input[type="time"]:focus,
input[type="number"]:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in oklch, var(--color-primary) 18%, transparent);
}
input::placeholder, textarea::placeholder { color: var(--color-text-faint); }

.mono { font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.04em; }

textarea {
  font-family: var(--font-body);
  line-height: 1.6;
}

/* --- FORM FOOTER --- */
.form-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
}

.btn-danger {
  font-size: var(--text-xs);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid color-mix(in oklch, var(--color-error) 40%, transparent);
  background: transparent;
  color: var(--color-error);
  font-weight: 500;
  transition: background var(--transition), border-color var(--transition);
}
.btn-danger:hover {
  background: var(--color-error-bg);
  border-color: var(--color-error);
}

.save-indicator {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-style: italic;
  transition: opacity var(--transition);
}

/* --- SCROLLBAR STYLING --- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--color-divider);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover { background: var(--color-border); }

/* --- RESPONSIVE --- */
@media (max-width: 768px) {
  :root { --sidebar-width: 100%; }
  .app-layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
  }
  .leg-list-panel {
    border-right: none;
    border-bottom: 1px solid var(--color-divider);
    max-height: 40dvh;
  }
  body { overflow: auto; }
  .app-layout { height: auto; overflow: visible; }
  .leg-detail-panel { overflow: visible; }
  .header-stats { display: none; }
}

@media (max-width: 480px) {
  .form-grid { grid-template-columns: 1fr; }
  .form-top { flex-direction: column; }
}