/* KHAYUBDI OS 2.0 — DEV-04 Core Screens */

:root {
  --os-bg: var(--ds-color-bg-primary, #0b0b0b);
  --os-bg-2: var(--ds-color-bg-secondary, #171717);
  --os-surface: var(--ds-color-surface, #222222);
  --os-border: var(--ds-color-border, rgba(255,255,255,.1));
  --os-text: var(--ds-color-text-primary, #f5f5f5);
  --os-muted: var(--ds-color-text-secondary, #a3a3a3);
  --os-accent: var(--ds-color-accent-green, #39ff88);
  --os-warning: var(--ds-color-warning, #fbbf24);
  --os-error: var(--ds-color-error, #fb7185);
  --os-success: var(--ds-color-success, #22c55e);
  --os-space-1: var(--ds-space-4, .25rem);
  --os-space-2: var(--ds-space-8, .5rem);
  --os-space-3: var(--ds-space-12, .75rem);
  --os-space-4: var(--ds-space-16, 1rem);
  --os-space-5: var(--ds-space-20, 1.25rem);
  --os-space-6: var(--ds-space-24, 1.5rem);
  --os-space-8: var(--ds-space-32, 2rem);
  --os-radius: var(--ds-radius-large, 1.25rem);
  --os-radius-sm: var(--ds-radius-small, .75rem);
  --os-shadow: var(--ds-shadow-medium, 0 18px 55px rgba(0,0,0,.35));
  --os-fast: var(--ds-transition-fast, 150ms ease);
}

body { background: var(--os-bg); }

.os-shell {
  display: grid;
  gap: var(--os-space-5);
  padding-bottom: calc(104px + env(safe-area-inset-bottom));
}

.os-topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--os-space-3);
  padding: calc(var(--os-space-3) + env(safe-area-inset-top)) var(--os-space-4) var(--os-space-3);
  background: linear-gradient(180deg, rgba(11,11,11,.96), rgba(11,11,11,.72));
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--os-border);
}

.os-brand { display: grid; gap: 2px; }
.os-brand__title { color: var(--os-text); font-size: 1rem; font-weight: 800; letter-spacing: -.02em; }
.os-brand__meta { color: var(--os-muted); font-size: .78rem; }

.os-view-root {
  display: grid;
  gap: var(--os-space-5);
  margin: 0 0 var(--os-space-6);
  padding: var(--os-space-5);
  border-radius: var(--os-radius);
  border: 1px solid var(--os-border);
  background: linear-gradient(145deg, rgba(34,34,34,.96), rgba(18,18,18,.94));
  box-shadow: var(--os-shadow);
  animation: osFadeSlide var(--os-fast);
}

.os-hero {
  display: grid;
  gap: var(--os-space-4);
  padding: var(--os-space-5);
  border-radius: var(--os-radius);
  background: radial-gradient(circle at top right, rgba(57,255,136,.18), transparent 42%), var(--os-bg-2);
  border: 1px solid rgba(57,255,136,.18);
}

.os-eyebrow { color: var(--os-accent); font-size: .82rem; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }
.os-title { margin: 0; color: var(--os-text); font-size: clamp(1.55rem, 7vw, 2rem); line-height: 1.08; letter-spacing: -.04em; }
.os-subtitle { margin: 0; color: var(--os-muted); font-size: 1rem; line-height: 1.5; }

.os-grid { display: grid; gap: var(--os-space-3); }
.os-grid--2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.os-grid--3 { grid-template-columns: repeat(3, minmax(0,1fr)); }

.os-card {
  display: grid;
  gap: var(--os-space-2);
  min-width: 0;
  padding: var(--os-space-4);
  border-radius: var(--os-radius);
  border: 1px solid var(--os-border);
  background: rgba(255,255,255,.045);
  box-shadow: 0 12px 35px rgba(0,0,0,.24);
}

.os-card--button {
  width: 100%;
  min-height: 44px;
  color: inherit;
  text-align: left;
  cursor: pointer;
  transition: transform var(--os-fast), border-color var(--os-fast), background var(--os-fast);
}

.os-card--button:active { transform: scale(.985); }
.os-card--button:focus-visible { outline: 2px solid var(--os-accent); outline-offset: 3px; }

.os-stat__label { color: var(--os-muted); font-size: .82rem; }
.os-stat__value { color: var(--os-text); font-size: 1.35rem; font-weight: 850; letter-spacing: -.03em; }
.os-stat__hint { color: var(--os-muted); font-size: .78rem; line-height: 1.35; }

.os-section { display: grid; gap: var(--os-space-3); }
.os-section__head { display: flex; align-items: center; justify-content: space-between; gap: var(--os-space-3); }
.os-section__title { margin: 0; color: var(--os-text); font-size: 1.1rem; font-weight: 800; }

.os-row { display: flex; align-items: center; justify-content: space-between; gap: var(--os-space-3); min-width: 0; }
.os-stack { display: grid; gap: var(--os-space-3); }
.os-actions { display: flex; flex-wrap: wrap; gap: var(--os-space-2); }

.os-button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--os-space-2);
  padding: 0 var(--os-space-4);
  border-radius: 999px;
  border: 1px solid var(--os-border);
  color: var(--os-text);
  background: rgba(255,255,255,.06);
  font-size: 1rem;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--os-fast), background var(--os-fast), border-color var(--os-fast);
}

.os-button--primary { background: var(--os-accent); color: #041008; border-color: var(--os-accent); }
.os-button--ghost { background: transparent; }
.os-button--danger { border-color: rgba(251,113,133,.45); color: var(--os-error); }
.os-button:active { transform: scale(.97); }
.os-button:focus-visible { outline: 2px solid var(--os-accent); outline-offset: 3px; }

.os-chip {
  min-height: 36px;
  padding: 0 var(--os-space-3);
  border-radius: 999px;
  border: 1px solid var(--os-border);
  background: rgba(255,255,255,.06);
  color: var(--os-text);
  font-size: .9rem;
}

.os-progress {
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(255,255,255,.08);
}

.os-progress > span {
  display: block;
  height: 100%;
  width: var(--value, 0%);
  border-radius: inherit;
  background: linear-gradient(90deg, var(--os-accent), rgba(57,255,136,.45));
  animation: osGrow 220ms ease-out;
}

.os-ring {
  --size: 72px;
  --value: 65;
  width: var(--size);
  height: var(--size);
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: conic-gradient(var(--os-accent) calc(var(--value) * 1%), rgba(255,255,255,.09) 0);
}

.os-ring::before {
  content: attr(data-label);
  width: calc(var(--size) - 16px);
  height: calc(var(--size) - 16px);
  display: grid;
  place-items: center;
  border-radius: inherit;
  background: var(--os-surface);
  color: var(--os-text);
  font-weight: 900;
  font-size: .95rem;
}

.os-input, .os-select, .os-textarea {
  width: 100%;
  min-height: 44px;
  border-radius: var(--os-radius-sm);
  border: 1px solid var(--os-border);
  background: rgba(0,0,0,.22);
  color: var(--os-text);
  padding: 0 var(--os-space-3);
  font: inherit;
}

.os-textarea { min-height: 92px; padding-block: var(--os-space-3); resize: vertical; }
.os-input:focus, .os-select:focus, .os-textarea:focus { outline: 2px solid var(--os-accent); outline-offset: 2px; }

.os-tabbar-spacer { min-height: calc(96px + env(safe-area-inset-bottom)); }

.os-fab {
  position: fixed;
  right: max(var(--os-space-4), env(safe-area-inset-right));
  bottom: calc(92px + env(safe-area-inset-bottom));
  z-index: 70;
  width: 56px;
  height: 56px;
  border-radius: 999px;
  border: 1px solid rgba(57,255,136,.3);
  background: var(--os-accent);
  color: #031008;
  box-shadow: 0 18px 45px rgba(57,255,136,.22);
  font-size: 1.35rem;
  cursor: pointer;
}

.os-fab:focus-visible { outline: 2px solid #fff; outline-offset: 3px; }

.os-sheet-backdrop {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
  align-items: flex-end;
  background: rgba(0,0,0,.58);
}

.os-sheet-backdrop.is-open { display: flex; }
.os-sheet {
  width: 100%;
  max-height: min(88vh, 760px);
  overflow: auto;
  padding: var(--os-space-5) var(--os-space-4) calc(var(--os-space-6) + env(safe-area-inset-bottom));
  border-radius: 24px 24px 0 0;
  border: 1px solid var(--os-border);
  background: var(--os-bg-2);
  box-shadow: 0 -24px 70px rgba(0,0,0,.45);
  animation: osSheetIn 200ms ease-out;
}

.os-toast-host {
  position: fixed;
  left: var(--os-space-4);
  right: var(--os-space-4);
  bottom: calc(156px + env(safe-area-inset-bottom));
  z-index: 120;
  display: grid;
  gap: var(--os-space-2);
  pointer-events: none;
}

.os-toast {
  padding: var(--os-space-3) var(--os-space-4);
  border-radius: var(--os-radius-sm);
  background: rgba(34,34,34,.98);
  border: 1px solid var(--os-border);
  color: var(--os-text);
  box-shadow: var(--os-shadow);
}

.os-skeleton {
  min-height: 78px;
  border-radius: var(--os-radius);
  background: linear-gradient(90deg, rgba(255,255,255,.05), rgba(255,255,255,.11), rgba(255,255,255,.05));
  background-size: 240% 100%;
  animation: osShimmer 1.2s infinite linear;
}

.os-chart-bars { display: flex; align-items: end; gap: var(--os-space-2); height: 96px; padding-top: var(--os-space-4); }
.os-chart-bars span { flex: 1; min-width: 18px; border-radius: 999px 999px 4px 4px; background: linear-gradient(180deg, var(--os-accent), rgba(57,255,136,.18)); height: var(--value, 35%); }

.os-empty { place-items: center; text-align: center; padding: var(--os-space-8) var(--os-space-5); }
.os-empty__icon { font-size: 2rem; }

.os-live {
  border-color: rgba(57,255,136,.28);
}

.outdoor-contrast {
  background: radial-gradient(circle at top right, rgba(57,255,136,.2), transparent 44%), #050505;
}

.os-live input,
.os-live select {
  font-size: 16px;
}

body:has(#devActiveExerciseTitle) .bottom-nav,
body:has(#devOutdoorElapsed) .bottom-nav {
  opacity: .18;
}

@supports not selector(:has(*)) {
  .bottom-nav { padding-bottom: env(safe-area-inset-bottom); }
}

@keyframes osFadeSlide { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@keyframes osSheetIn { from { transform: translateY(100%); } to { transform: translateY(0); } }
@keyframes osGrow { from { width: 0; } }
@keyframes osShimmer { to { background-position: -240% 0; } }

@media (min-width: 720px) {
  .os-grid--tablet-3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .os-grid--tablet-2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .os-view-root { padding: var(--os-space-6); }
}

@media (max-width: 360px) {
  .os-grid--3 { grid-template-columns: 1fr; }
  .os-grid--2 { grid-template-columns: 1fr; }
  .os-view-root { padding: var(--os-space-4); }
}

@media (prefers-reduced-motion: reduce) {
  .os-view-root, .os-sheet, .os-progress > span, .os-skeleton { animation: none; }
  .os-button, .os-card--button { transition: none; }
}