/* ==== Calculator (theme-aware) ==== */

.page-container { max-width: 900px; margin: 20px auto; padding:0 15px; font-family:"Segoe UI",sans-serif; }

.page-title { font-size:1.6rem; font-weight:700; color:var(--text); margin-bottom:16px; }

/* unified card */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}

.calc-form .form-field { margin-bottom:14px; }
.calc-form label { font-weight:600; color:var(--text); opacity:.85; display:block; margin-bottom:4px; }
.calc-form input, .calc-form select {
  width:100%; padding:8px;
  border:1px solid var(--border); border-radius:8px;
  background:var(--card); color:var(--text);
}

.calc-table { width:100%; border-collapse:collapse; margin-bottom:12px; }
.calc-table th, .calc-table td {
  border:1px solid var(--border);
  padding:6px; text-align:center; white-space:nowrap; color:var(--text);
}
.calc-table th { background:var(--surface); }

.mode-select { display:flex; gap:20px; margin:12px 0; }
.form-actions { display:flex; gap:12px; flex-wrap:wrap; }

/* steps container */
.steps { background:var(--surface); }
.steps ol { list-style:decimal; padding-left:20px; }
.step-item { margin-bottom:14px; }
.step-item b { color:var(--text); }
.step-item .muted { color:var(--muted); font-size:0.9rem; }

.final-answer { font-size:1.2rem; font-weight:600; color:var(--accent); }

/* Use base buttons; only small helpers here */
.btn.xs { font-size:0.8rem; padding:4px 8px; }

/* Rendered 'table' steps */
.step-table { border-collapse: collapse; width: 100%; min-width: auto; }
.step-table th, .step-table td {
  border: 1px solid var(--border);
  padding: 6px 10px; text-align: center; white-space: nowrap;
  max-width: 140px; overflow: hidden; text-overflow: ellipsis;
}

/* Formula scrolling */
.formula { overflow-x: auto; max-width: 100%; white-space: nowrap; padding: 4px 0; }
.formula-row .btn.sm { white-space: nowrap; }
.formula-row .formula { overflow-x: auto; }

/* Grid on calculators index (already tokenized below) */
.calc-grid { display:grid; grid-template-columns:repeat(auto-fill, minmax(160px,1fr)); gap:12px; }
.calc-card {
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  padding: 6px; border:1px solid var(--border); border-radius:10px;
  background:var(--card); text-decoration:none; color:var(--text);
  transition: all .2s; box-shadow: var(--shadow);
}
.calc-card:hover { transform: translateY(-3px); border-color: var(--accent); }
.calc-name { font-weight:600; text-align:center; }

/* Optional section styles; keep themeable */
.calc-section { margin-bottom:20px; background: var(--surface); }
.calc-chapter { font-size:1.2rem; margin-bottom:12px; font-weight:600; color: var(--text); }

/* Mobile */
@media (max-width: 640px) {
  .calc-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
  .calc-card { padding: 10px; }
}
@media (max-width: 700px) {
  .step-table th, .step-table td { font-size: 12px; padding: 2px 3px; }
  .formula { font-size: 14px; }
}

/* Success/Error helpers (use tokens where possible) */
.success { color:#16a34a; font-weight:600; margin-left:8px; }
.error { color:#dc2626; font-weight:600; margin-left:8px; }

/* === LaTeX step blocks: neat background, scroll-safe, theme-aware === */
.steps .formula {
  position: relative;
  padding: 10px 12px;
  margin: 8px 0;
  border-radius: 10px;
  border: 1px solid var(--border);
  background:
    linear-gradient(180deg, rgba(0,0,0,0.02), rgba(0,0,0,0)) /* subtle tint */
    , var(--card);
  box-shadow: 0 1px 0 rgba(0,0,0,0.04) inset;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  max-width: 100%;
}

/* Make the MathJax box respect the rounded background + no overflow */
.steps .formula .mjx-container,
.steps .formula .katex-display {
  overflow-x: auto !important;
  border-radius: 8px;
}

/* Slightly larger display math on mobile is too big → tame it */
@media (max-width: 640px) {
  .steps .formula { padding: 8px 10px; }
  .steps .formula .mjx-container, .steps .formula .katex-display { font-size: 0.98rem; }
}

/* Copy button that floats on the block (shown on hover/touch) */
.formula .copy-btn {
  position: absolute;
  top: 6px; right: 6px;
  padding: 4px 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 0.8rem;
  cursor: pointer;
  opacity: 0;
  transition: opacity .15s ease, transform .15s ease;
}
.formula:hover .copy-btn,
.formula:focus-within .copy-btn { opacity: 1; }
.formula .copy-btn.copied { transform: scale(.97); }

/* Stronger contrast in light theme; softer in dark */
:root[data-theme="light"] .steps .formula {
  background:
    linear-gradient(180deg, rgba(9,30,66,0.04), rgba(9,30,66,0.02))
    , #fff;
  border-color: #e5e7eb;
}
:root[data-theme="dark"] .steps .formula {
  background:
    linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.02))
    , var(--surface);
  border-color: rgba(255,255,255,0.12);
}

/* === Theme-specific LaTeX block colors === */

/* Light theme → very light blue background */
:root[data-theme="light"] .steps .formula {
  background: #f0f7ff;   /* soft blue */
  border-color: #c7defc;
}
:root[data-theme="light"] .steps .formula .mjx-container,
:root[data-theme="light"] .steps .formula .katex-display {
  color: #0b172a;        /* strong text for contrast */
}

/* Dark theme → keep the dark card look with subtle teal tint */
:root[data-theme="dark"] .steps .formula {
  background: rgba(59,130,246,0.12);  /* faint blue glow */
  border-color: rgba(59,130,246,0.3);
}
:root[data-theme="dark"] .steps .formula .mjx-container,
:root[data-theme="dark"] .steps .formula .katex-display {
  color: #dbeafe;        /* softer blue-white for dark bg */
}



/* ==== OVERRIDE: LaTeX colors – Green accent (Option 2) ==== */
/* Works for both themes; keeps everything scroll-safe and readable */

/* Base formula card: add a subtle left accent bar for “math highlight” */
.steps .formula {
  position: relative;
  padding: 12px 14px 12px 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  max-width: 100%;
  box-shadow: 0 1px 0 rgba(0,0,0,0.04) inset;
}

/* Light theme → mint card */
:root[data-theme="light"] .steps .formula {
  background: #ecfdf5;                         /* mint */
  border-color: #a7f3d0;
  box-shadow:
    inset 4px 0 0 #34d399,                     /* left accent bar */
    0 1px 0 rgba(0,0,0,0.03);
}
:root[data-theme="light"] .steps .formula .mjx-container,
:root[data-theme="light"] .steps .formula .katex-display {
  color: #0b172a;                               /* strong readable text */
}

/* Dark theme → emerald tint */
:root[data-theme="dark"] .steps .formula {
  background: rgba(16,185,129,0.16);            /* emerald glass */
  border-color: rgba(16,185,129,0.36);
  box-shadow:
    inset 4px 0 0 rgba(16,185,129,0.85),        /* left accent bar */
    0 1px 0 rgba(0,0,0,0.2);
}
:root[data-theme="dark"] .steps .formula .mjx-container,
:root[data-theme="dark"] .steps .formula .katex-display {
  color: #d1fae5;                               /* minty text for contrast */
}

/* Hover/Focus: slight lift to make it feel interactive (desktop) */
@media (hover: hover) {
  .steps .formula:hover {
    filter: brightness(1.02);
  }
}

/* Keep MathJax/KaTeX safe inside rounded card */
.steps .formula .mjx-container,
.steps .formula .katex-display {
  overflow-x: auto !important;
  border-radius: 8px;
}

/* Mobile comfort */
@media (max-width: 640px) {
  .steps .formula { padding: 10px 12px 10px 14px; }
  .steps .formula .mjx-container, 
  .steps .formula .katex-display { font-size: 0.98rem; }
}

/* Copy button (if you added the JS) stays theme-aware */
.formula .copy-btn {
  position: absolute;
  top: 6px; right: 6px;
  padding: 4px 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 0.8rem;
  cursor: pointer;
  opacity: 0;
  transition: opacity .15s ease, transform .15s ease;
}
.formula:hover .copy-btn,
.formula:focus-within .copy-btn { opacity: 1; }
.formula .copy-btn.copied { transform: scale(.97); }