/* ============================================================================
   tool-shell.css — Study Decoder shared tool design system
   ----------------------------------------------------------------------------
   ONE source of truth for the look of every student tool. Extracted from the
   cleanest tool (Essay Master / Essay Coach): gold accent, Fraunces display +
   Inter body, dark surfaces, consistent buttons / inputs / cards.

   Load AFTER brand.css + theme.css:
       <link rel="stylesheet" href="brand.css">
       <link rel="stylesheet" href="theme.css">
       <link rel="stylesheet" href="tool-shell.css">

   Change a token here → every tool that uses the shell updates at once.
   Components are namespaced `.ts-*` so they never collide with page CSS.
   ========================================================================== */

:root {
  /* Accent */
  --ts-gold:      #0f9bbd;
  --ts-gold-2:    #ffcf6b;
  --ts-gold-deep: #d97706;

  /* Surfaces (dark) */
  --ts-ink:       #0c1016;
  --ts-surface:   #141a22;
  --ts-surface-2: #1b232e;
  --ts-line:      rgba(255, 255, 255, 0.10);

  /* Text */
  --ts-text:      #eef1f5;
  --ts-text-soft: rgba(255, 255, 255, 0.68);
  --ts-text-dim:  rgba(255, 255, 255, 0.50);

  /* Status colours */
  --ts-danger:    #f87171;
  --ts-success:   #34d399;

  /* Shape + type */
  --ts-radius:    14px;
  --ts-radius-sm: 10px;
  --ts-font-display: var(--bd-font-display, 'Fraunces', Georgia, serif);
  --ts-font-body:    var(--bd-font-body, 'Inter', -apple-system, BlinkMacSystemFont, sans-serif);

  /* Page backdrop */
  --ts-bg: radial-gradient(1100px 600px at 50% -8%, #1b2130, var(--ts-ink));
}

/* Light theme overrides — the shell is dark-first, but respects theme.js. */
:root[data-theme="light"] {
  --ts-ink:       #f6f7f9;
  --ts-surface:   #ffffff;
  --ts-surface-2: #f0f2f5;
  --ts-line:      rgba(12, 16, 22, 0.12);
  --ts-text:      #14181f;
  --ts-text-soft: rgba(20, 24, 31, 0.72);
  --ts-text-dim:  rgba(20, 24, 31, 0.55);
  --ts-bg: radial-gradient(1100px 600px at 50% -8%, #eef1f6, var(--ts-ink));
}

/* ── Page base ─────────────────────────────────────────────────────────── */
.ts-body {
  margin: 0;
  font-family: var(--ts-font-body);
  background: var(--ts-bg);
  color: var(--ts-text);
  min-height: 100vh;
  min-height: 100dvh;
}
.ts-body h1, .ts-body h2, .ts-body h3,
.ts-h1, .ts-h2, .ts-h3 {
  font-family: var(--ts-font-display);
  letter-spacing: -0.01em;
}

/* Full-height "app" layout (header + scroll body + docked input) */
.ts-app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  width: 100%;
  overflow-x: hidden;
}

/* ── Top bar + back link ───────────────────────────────────────────────── */
.ts-topbar {
  display: flex;
  align-items: center;
  gap: 14px;
  justify-content: space-between;
  padding: 14px 20px;
  background: linear-gradient(180deg, var(--ts-surface), rgba(20, 26, 34, 0.5));
  border-bottom: 1px solid var(--ts-line);
  flex-shrink: 0;
}
.ts-topbar-left { display: flex; align-items: center; gap: 16px; }
.ts-topbar-title { font-size: 1.15rem; font-weight: 700; color: var(--ts-text); font-family: var(--ts-font-display); }
.ts-topbar-sub { font-size: 0.76rem; color: var(--ts-text-dim); margin-top: 2px; }

.ts-back {
  color: var(--ts-gold);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--ts-radius-sm);
  background: rgba(15, 155, 189, 0.08);
  border: 1px solid rgba(15, 155, 189, 0.25);
  transition: background 0.2s, border-color 0.2s;
  white-space: nowrap;
}
.ts-back:hover { background: rgba(15, 155, 189, 0.16); }

/* ── Centred content container ─────────────────────────────────────────── */
.ts-container { max-width: 900px; margin: 0 auto; padding: 0 18px 90px; }
.ts-container-wide { max-width: 1000px; }

/* ── Hero (marketing-style tool intro) ─────────────────────────────────── */
.ts-hero { text-align: center; padding: 26px 8px 10px; }
.ts-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.7rem; font-weight: 800; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ts-gold);
  border: 1px solid rgba(15, 155, 189, 0.35);
  border-radius: 999px; padding: 6px 14px;
  background: rgba(15, 155, 189, 0.06);
}
.ts-hero h1 { font-size: 2.5rem; line-height: 1.05; margin: 16px 0 8px; }
.ts-lede { color: var(--ts-text-soft); font-size: 1.02rem; max-width: 620px; margin: 0 auto; line-height: 1.55; }

/* ── Card ──────────────────────────────────────────────────────────────── */
.ts-card {
  background: linear-gradient(180deg, var(--ts-surface), rgba(20, 26, 34, 0.65));
  border: 1px solid var(--ts-line);
  border-radius: 18px;
  padding: 22px;
  margin-top: 18px;
}
.ts-card.is-locked { opacity: 0.5; pointer-events: none; }
.ts-card-head { display: flex; align-items: center; gap: 12px; margin-bottom: 6px; }
.ts-card-head h2 { font-size: 1.22rem; }
.ts-pill {
  margin-left: auto; font-size: 0.66rem; font-weight: 800; letter-spacing: 0.05em;
  text-transform: uppercase; color: var(--ts-gold);
  border: 1px solid rgba(15, 155, 189, 0.3); border-radius: 999px; padding: 4px 10px; white-space: nowrap;
}

/* ── Form controls ─────────────────────────────────────────────────────── */
.ts-label {
  display: block; font-size: 0.8rem; font-weight: 700;
  color: var(--ts-text-soft); margin: 12px 0 5px;
}
.ts-input, .ts-select, .ts-textarea {
  width: 100%;
  background: rgba(0, 0, 0, 0.28);
  border: 1px solid var(--ts-line);
  color: var(--ts-text);
  border-radius: var(--ts-radius-sm);
  padding: 11px 13px;
  font-size: 0.92rem;
  font-family: inherit;
  transition: border-color 0.2s;
}
:root[data-theme="light"] .ts-input,
:root[data-theme="light"] .ts-select,
:root[data-theme="light"] .ts-textarea { background: rgba(0, 0, 0, 0.04); }
.ts-input:focus, .ts-select:focus, .ts-textarea:focus { outline: none; border-color: var(--ts-gold); }
.ts-textarea { min-height: 120px; resize: vertical; line-height: 1.55; }

/* Dark-theme native select: strip the default arrow, add a gold chevron. */
.ts-select {
  -webkit-appearance: none; -moz-appearance: none; appearance: none;
  cursor: pointer; padding-right: 40px;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%23f5a623' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'><path d='M6 9l6 6 6-6'/></svg>");
  background-repeat: no-repeat; background-position: right 14px center;
}
/* Multi-select listboxes need an OPAQUE background — Chrome composites a
   transparent one against white. */
.ts-select[multiple] { background-image: none; padding-right: 13px; background-color: var(--ts-surface-2); }
.ts-select[multiple] option:checked { background: rgba(15, 155, 189, 0.22); color: var(--ts-text); }
.ts-select option { background: var(--ts-surface-2); color: var(--ts-text); }

/* ── Buttons ───────────────────────────────────────────────────────────── */
.ts-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: linear-gradient(135deg, var(--ts-gold), var(--ts-gold-deep));
  color: #04222b;
  border: none; border-radius: 11px;
  padding: 12px 20px;
  font-weight: 800; font-size: 0.95rem;
  cursor: pointer; font-family: inherit;
  transition: filter 0.15s, opacity 0.15s;
}
.ts-btn:hover:not(:disabled) { filter: brightness(1.06); }
.ts-btn:disabled { opacity: 0.55; cursor: default; }
.ts-btn-ghost {
  background: rgba(255, 255, 255, 0.06);
  color: var(--ts-text);
  border: 1px solid var(--ts-line);
}
:root[data-theme="light"] .ts-btn-ghost { background: rgba(0, 0, 0, 0.04); }
.ts-btn-block { width: 100%; }

/* ── Misc ──────────────────────────────────────────────────────────────── */
.ts-muted { color: var(--ts-text-dim); font-size: 0.82rem; }
.ts-status { font-size: 0.85rem; margin-top: 10px; min-height: 1.1em; }
.ts-status.is-error { color: var(--ts-danger); }
.ts-status.is-ok { color: var(--ts-success); }

/* Chip (selectable tag) */
.ts-chip {
  background: rgba(0, 0, 0, 0.28);
  border: 1px solid var(--ts-line);
  padding: 6px 12px; border-radius: 999px;
  font-size: 0.78rem; cursor: pointer; transition: border-color 0.2s, background 0.2s;
}
.ts-chip:hover { border-color: rgba(15, 155, 189, 0.5); }
.ts-chip.is-selected { background: rgba(15, 155, 189, 0.10); border-color: var(--ts-gold); color: var(--ts-text); }

/* Spinner */
.ts-spinner {
  width: 44px; height: 44px;
  border: 4px solid var(--ts-line);
  border-top-color: var(--ts-gold);
  border-radius: 50%;
  animation: ts-spin 1s linear infinite;
}
@keyframes ts-spin { to { transform: rotate(360deg); } }

.ts-hidden { display: none !important; }

@media (max-width: 720px) {
  .ts-hero h1 { font-size: 2rem; }
  .ts-topbar { padding: 12px 16px; }
}