/* ============================================================================
   Study Lamp — "The Lamplit Shelf"
   Light-first gallery. One warm amber accent (the lamp), single humanist family
   (Readex Pro). Dark theme kept behind [data-theme="dark"]. Bilingual: logical
   properties mirror cleanly between LTR (English) and RTL (Egyptian Arabic).
   ============================================================================ */

/* ---- Tokens: light (default) ---- */
:root,
[data-theme="light"] {
  --bg:        oklch(0.985 0.005 78);
  --surface:   oklch(1.000 0.000 0);
  --surface-2: oklch(0.965 0.007 78);
  --ink:       oklch(0.255 0.012 72);
  --muted:     oklch(0.470 0.013 74);
  --faint:     oklch(0.600 0.012 74);
  --border:    oklch(0.905 0.008 78);
  --border-strong: oklch(0.840 0.010 78);

  --lamp:      oklch(0.700 0.150 68);
  --lamp-soft: oklch(0.700 0.150 68 / 0.14);
  --lamp-glow: oklch(0.720 0.150 68 / 0.30);
  --on-lamp:   oklch(0.995 0.006 78);

  --danger:    oklch(0.540 0.165 28);
  --shadow-card: 0 1px 2px oklch(0.4 0.02 72 / 0.06), 0 8px 24px -16px oklch(0.4 0.02 72 / 0.4);

  /* spacing scale (4pt base) */
  --s-1: 0.25rem; --s-2: 0.5rem; --s-3: 0.75rem; --s-4: 1rem;
  --s-5: 1.5rem; --s-6: 2rem; --s-7: 3rem; --s-8: 4rem;

  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 18px;

  --font: "Readex Pro", system-ui, -apple-system, "Segoe UI", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 200ms;

  --z-sticky: 100;
  --z-toast: 400;

  color-scheme: light;
}

/* ---- Tokens: dark ---- */
[data-theme="dark"] {
  --bg:        oklch(0.175 0.012 72);
  --surface:   oklch(0.215 0.013 72);
  --surface-2: oklch(0.255 0.014 72);
  --ink:       oklch(0.950 0.010 78);
  --muted:     oklch(0.730 0.012 78);
  --faint:     oklch(0.560 0.012 78);
  --border:    oklch(0.320 0.012 72);
  --border-strong: oklch(0.400 0.014 72);

  --lamp:      oklch(0.800 0.150 73);
  --lamp-soft: oklch(0.800 0.150 73 / 0.16);
  --lamp-glow: oklch(0.820 0.150 73 / 0.42);
  --on-lamp:   oklch(0.180 0.014 72);

  --danger:    oklch(0.640 0.150 28);
  --shadow-card: 0 1px 2px oklch(0 0 0 / 0.3), 0 10px 30px -16px oklch(0 0 0 / 0.6);

  color-scheme: dark;
}

/* ---- Reset-ish ---- */
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { font-size: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}
h1, h2, h3 { line-height: 1.2; margin: 0; text-wrap: balance; letter-spacing: -0.01em; }
p { margin: 0; text-wrap: pretty; }
button { font: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--lamp); outline-offset: 2px; border-radius: var(--radius-sm); }

.skip-link {
  position: absolute; inset-inline-start: var(--s-3); inset-block-start: -4rem;
  background: var(--lamp); color: var(--on-lamp); padding: var(--s-2) var(--s-4);
  border-radius: var(--radius-sm); z-index: var(--z-toast); transition: inset-block-start var(--dur) var(--ease);
}
.skip-link:focus { inset-block-start: var(--s-3); }

/* ---- Topbar ---- */
.topbar {
  position: sticky; top: 0; z-index: var(--z-sticky);
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--s-4);
  padding: var(--s-3) var(--s-5);
  background: color-mix(in oklch, var(--bg) 86%, transparent);
  backdrop-filter: blur(8px);
  border-block-end: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: var(--s-3); font-weight: 600; background: transparent; border: 0; color: var(--ink); padding: var(--s-1); border-radius: var(--radius-sm); }
.brand__lamp {
  display: grid; place-items: center; inline-size: 36px; block-size: 36px;
  border-radius: 10px; color: var(--lamp);
  background: var(--lamp-soft);
  box-shadow: 0 0 18px -2px var(--lamp-glow);
}
.brand__name { font-size: 1.05rem; letter-spacing: -0.01em; }
.topbar__controls { display: flex; align-items: center; gap: var(--s-2); }

.lang-toggle {
  background: transparent; color: var(--muted); border: 1px solid var(--border);
  padding: var(--s-2) var(--s-3); border-radius: 999px; font-size: 0.9rem; font-weight: 500;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.lang-toggle:hover { color: var(--ink); border-color: var(--border-strong); }

.icon-btn {
  display: grid; place-items: center; inline-size: 40px; block-size: 40px;
  background: transparent; color: var(--muted); border: 1px solid var(--border);
  border-radius: 10px; transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.icon-btn:hover { color: var(--ink); border-color: var(--border-strong); }
.icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: block; }

/* ---- Layout ---- */
.main {
  max-inline-size: 1180px; margin-inline: auto;
  padding: var(--s-6) var(--s-5) var(--s-8);
}

/* ---- Views ---- */
.view { animation: rise var(--dur) var(--ease) both; }
@keyframes rise { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ---- Gallery ---- */
.gallery__head {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: var(--s-3); margin-block-end: var(--s-6);
}
.gallery__title { font-size: clamp(1.4rem, 1rem + 1.6vw, 1.9rem); font-weight: 700; }
.gallery__grid {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: var(--s-4);
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}
.gallery__empty { color: var(--faint); font-size: 0.95rem; padding: var(--s-6) 0; text-align: center; }

.card {
  display: flex; flex-direction: column; inline-size: 100%; text-align: start;
  padding: 0; overflow: hidden;
  background: var(--surface); color: var(--ink);
  border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.card:hover { transform: translateY(-3px); border-color: var(--border-strong); box-shadow: 0 8px 28px -12px var(--lamp-glow); }
.card__thumb {
  position: relative; display: block; aspect-ratio: 3 / 4; overflow: hidden;
  background: var(--surface-2); border-block-end: 1px solid var(--border);
}
.card__img { inline-size: 100%; block-size: 100%; object-fit: cover; object-position: top center; display: block; }
.card__fallback {
  position: absolute; inset: 0; display: none; place-items: center; color: var(--lamp);
  background: radial-gradient(circle at 50% 35%, var(--lamp-soft), transparent 70%);
}
.card__thumb[data-fallback="true"] .card__img { display: none; }
.card__thumb[data-fallback="true"] .card__fallback { display: grid; }
.card__meta { display: flex; flex-direction: column; gap: 2px; padding: var(--s-3) var(--s-4) var(--s-4); }
.card__name { font-weight: 600; font-size: 0.98rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.card__date { font-size: 0.8rem; color: var(--muted); }
.card--add {
  align-items: center; justify-content: center;
  block-size: 100%; min-block-size: 12rem;
  border-style: dashed; box-shadow: none;
  background: transparent; color: var(--faint);
  font-size: 2.2rem; font-weight: 300; line-height: 1;
}
.card--add:hover { color: var(--lamp); border-color: var(--lamp); box-shadow: none; }

/* ---- Back link ---- */
.backlink {
  display: inline-flex; align-items: center; gap: var(--s-2);
  background: transparent; border: 0; color: var(--muted);
  padding: var(--s-2) 0; margin-block-end: var(--s-4); font-weight: 500;
  transition: color var(--dur) var(--ease);
}
.backlink:hover { color: var(--ink); }
[dir="rtl"] .backlink svg { transform: scaleX(-1); }

/* ---- Compose ---- */
.compose {
  max-inline-size: 64ch;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: clamp(var(--s-5), 4vw, var(--s-7));
  box-shadow: var(--shadow-card);
}
.compose__title { font-size: clamp(1.5rem, 1rem + 2vw, 2.1rem); font-weight: 700; }
.compose__sub { color: var(--muted); margin-block-start: var(--s-3); max-inline-size: 52ch; }
.compose__form { margin-block-start: var(--s-6); display: flex; flex-direction: column; gap: var(--s-5); }
.field { display: flex; flex-direction: column; gap: var(--s-2); }
.field__label { font-size: 0.9rem; font-weight: 500; color: var(--ink); }

.input, .textarea {
  inline-size: 100%; font: inherit; color: var(--ink);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--s-3) var(--s-4);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.input::placeholder, .textarea::placeholder { color: var(--faint); }
.textarea { resize: vertical; min-block-size: 8rem; line-height: 1.6; }
.input:focus, .textarea:focus {
  outline: none; border-color: var(--lamp);
  box-shadow: 0 0 0 3px var(--lamp-soft);
}

.compose__actions { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-3); }
.compose__hint { color: var(--faint); font-size: 0.85rem; max-inline-size: 36ch; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--s-2);
  padding: var(--s-3) var(--s-5); border-radius: 999px; font-weight: 600; font-size: 0.95rem;
  border: 1px solid transparent; text-decoration: none;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
              background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.btn--primary { background: var(--lamp); color: var(--on-lamp); }
.btn--primary:hover { transform: translateY(-1px); box-shadow: 0 6px 22px -6px var(--lamp-glow); }
.btn--primary:active { transform: translateY(0); }
.btn--lamp { box-shadow: 0 4px 18px -8px var(--lamp-glow); }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--border-strong); }
.btn--ghost:hover { background: var(--surface-2); }
.btn[disabled] { opacity: 0.55; cursor: progress; transform: none; box-shadow: none; }

.error { color: var(--danger); font-size: 0.9rem; }

/* ---- Progress ---- */
.progress {
  max-inline-size: 52ch; margin-inline: auto; margin-block-start: var(--s-7);
  text-align: center; display: flex; flex-direction: column; align-items: center; gap: var(--s-4);
}
.progress__lamp {
  inline-size: 56px; block-size: 56px; border-radius: 50%;
  background: radial-gradient(circle at 50% 40%, var(--lamp), transparent 70%);
  box-shadow: 0 0 40px -4px var(--lamp-glow);
  animation: breathe 2.4s var(--ease) infinite;
}
@keyframes breathe { 0%,100% { opacity: 0.6; transform: scale(0.94); } 50% { opacity: 1; transform: scale(1.04); } }
.progress__title { font-size: 1.4rem; font-weight: 700; }
.progress__module { color: var(--lamp); font-weight: 500; }
.steps { list-style: none; margin: var(--s-3) 0 0; padding: 0; display: flex; flex-direction: column; gap: var(--s-3); text-align: start; inline-size: 100%; max-inline-size: 22rem; }
.step { display: flex; align-items: center; gap: var(--s-3); color: var(--faint); transition: color var(--dur) var(--ease); }
.step__dot {
  inline-size: 12px; block-size: 12px; border-radius: 50%; flex: none;
  border: 2px solid var(--border-strong); background: transparent;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.step__count { margin-inline-start: auto; font-variant-numeric: tabular-nums; color: var(--muted); font-size: 0.85rem; }
.step[data-state="done"] { color: var(--muted); }
.step[data-state="done"] .step__dot { background: var(--lamp); border-color: var(--lamp); }
.step[data-state="active"] { color: var(--ink); font-weight: 500; }
.step[data-state="active"] .step__dot {
  border-color: var(--lamp); background: var(--lamp);
  box-shadow: 0 0 0 4px var(--lamp-soft); animation: pulse 1.4s var(--ease) infinite;
}
@keyframes pulse { 0%,100% { box-shadow: 0 0 0 3px var(--lamp-soft); } 50% { box-shadow: 0 0 0 7px transparent; } }
.progress__detail { color: var(--muted); font-size: 0.9rem; min-block-size: 1.2em; }

/* ---- Result ---- */
.view--result { display: flex; flex-direction: column; gap: var(--s-4); min-block-size: 70vh; }
.result__bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--s-3); }
.result__name { font-size: 1.25rem; font-weight: 600; }
.result__actions { display: flex; gap: var(--s-2); }
.result__pdf {
  inline-size: 100%; flex: 1; min-block-size: 70vh; border: 1px solid var(--border);
  border-radius: var(--radius); background: var(--surface);
}

/* ---- Error ---- */
.errorbox {
  max-inline-size: 46ch; margin-inline: auto; margin-block-start: var(--s-7); text-align: center;
  display: flex; flex-direction: column; gap: var(--s-4); align-items: center;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: var(--s-6);
}
.errorbox__title { font-size: 1.3rem; font-weight: 700; }
.errorbox__msg { color: var(--muted); }

/* ---- RTL nudges (logical properties mirror the rest automatically) ---- */
[dir="rtl"] body { line-height: 1.85; }
[dir="rtl"] .compose__title,
[dir="rtl"] .progress__title,
[dir="rtl"] .gallery__title { letter-spacing: 0; }

/* ---- Reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .view { animation: none; }
  .progress__lamp, .step[data-state="active"] .step__dot { animation: none; }
  .card:hover { transform: none; }
}

/* ---- Drive ---- */
.drive-btn { display: inline-flex; align-items: center; gap: var(--s-2); padding: var(--s-2) var(--s-3); border: 1px solid var(--border); border-radius: 999px; color: var(--muted); font-size: 0.9rem; font-weight: 500; text-decoration: none; transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease); }
.drive-btn:hover { color: var(--ink); border-color: var(--border-strong); }
.drive-btn[data-connected="true"] { color: var(--lamp); border-color: color-mix(in oklch, var(--lamp) 40%, transparent); pointer-events: none; }
.result__drive { display: flex; align-items: center; gap: var(--s-3); color: var(--muted); font-size: 0.9rem; }
.result__drive a { color: var(--lamp); font-weight: 500; }