/* =====================================================
   Calculator Pro — basic-calc.css
   Scientific Calculator Styles
   ===================================================== */

.calc-section {
  padding: 40px 0 60px;
  background: var(--bg);
  min-height: 60vh;
}

.sci-calc-wrapper {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 32px;
  align-items: start;
  justify-content: center;
}

@media (max-width: 900px) {
  .sci-calc-wrapper {
    grid-template-columns: 1fr;
    justify-items: center;
  }
}

/* ── Calculator Card ── */
.sci-calc-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  border: 1px solid var(--border);
  width: 420px;
  max-width: 100%;
}

@media (max-width: 460px) {
  .sci-calc-card {
    width: 100%;
  }
}

/* ── Mode Bar ── */
.sci-mode-bar {
  display: flex;
  border-bottom: 1px solid var(--border);
}

.sci-mode-btn {
  flex: 1;
  padding: 10px 0;
  border: none;
  background: transparent;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s;
  font-family: 'Inter', sans-serif;
}

.sci-mode-btn.active {
  color: var(--primary);
  border-bottom: 2px solid var(--primary);
  background: var(--primary-light);
}

.sci-mode-btn:hover {
  background: var(--bg-input);
}

/* ── Display ── */
.sci-display {
  background: var(--text);
  color: #fff;
  padding: 20px 20px 16px;
  min-height: 90px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: flex-end;
  word-break: break-all;
}

.sci-expression {
  font-size: 13px;
  color: rgba(255,255,255,0.55);
  min-height: 18px;
  margin-bottom: 6px;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sci-result {
  font-size: 38px;
  font-weight: 700;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Memory Indicator ── */
.sci-mem-indicator {
  text-align: right;
  padding: 2px 12px;
  font-size: 12px;
  color: var(--primary);
  font-weight: 700;
  min-height: 18px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

/* ── Scientific Function Row ── */
.sci-fn-row {
  display: flex;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.sci-fn-btn {
  flex: 1;
  padding: 6px 0;
  border: none;
  background: transparent;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  font-family: 'Inter', sans-serif;
  transition: background 0.1s;
}

.sci-fn-btn:hover {
  background: var(--bg-input);
}

.sci-fn-btn.active-2nd {
  background: var(--primary);
  color: #fff;
}

/* ── Scientific Buttons Grid ── */
.sci-btns-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  background: var(--border);
  border-bottom: 1px solid var(--border);
}

.sci-btn {
  border: none;
  padding: 12px 0;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  background: var(--bg-card);
  color: var(--text);
  transition: background 0.1s;
  font-family: 'Inter', sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sci-btn:hover {
  background: var(--bg-input);
}

.sci-btn:active {
  background: var(--primary-light);
}

.sci-btn.fn {
  background: var(--bg);
  color: var(--primary);
  font-weight: 600;
  font-size: 13px;
}

.sci-btn.op {
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 700;
  font-size: 18px;
}

.sci-btn.eq {
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  font-size: 22px;
}

.sci-btn.eq:hover {
  background: var(--primary-dark);
}

.sci-btn.active-op {
  background: var(--primary);
  color: #fff;
}

.sci-btn.num {
  font-size: 17px;
  font-weight: 600;
}

/* ── Main Buttons Grid ── */
.sci-main-btns {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
}

.sci-main-btns .sci-btn {
  padding: 18px 0;
  font-size: 19px;
}

/* ── Info Panel ── */
.calc-info {
  max-width: 480px;
}

.calc-info h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text);
}

.info-list {
  list-style: none;
  padding: 0;
  margin: 0 0 28px 0;
}

.info-list li {
  padding: 8px 0 8px 24px;
  position: relative;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.6;
}

.info-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: 700;
}

/* ── History ── */
.info-history {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}

.info-history h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text);
}

.history-list {
  max-height: 200px;
  overflow-y: auto;
  margin-bottom: 10px;
}

.history-item {
  padding: 6px 0;
  font-size: 13px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: color 0.15s;
}

.history-item:hover {
  color: var(--primary);
}

.history-item:last-child {
  border-bottom: none;
}

.history-expr {
  color: var(--text-muted);
  font-size: 12px;
}

.history-result {
  font-weight: 600;
  color: var(--text);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s;
}

.btn-sm:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* ── All Calculators Grid ── */
.all-calc-section {
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}

.section-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}

.section-desc {
  color: var(--text-secondary);
  margin-bottom: 24px;
  font-size: 15px;
}

.all-calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

.all-calc-card {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.15s;
}

.all-calc-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
  color: var(--primary);
}

.all-calc-card.active {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}

.all-calc-icon {
  font-size: 20px;
}

/* ── Dark Mode ── */
[data-theme="dark"] .sci-display {
  background: #0f172a;
}

[data-theme="dark"] .sci-btn {
  background: var(--bg-card);
}

[data-theme="dark"] .sci-btn.fn {
  background: rgba(255,255,255,0.05);
}

/* ── Responsive ── */
@media (max-width: 500px) {
  .sci-calc-card {
    width: 100%;
  }

  .sci-result {
    font-size: 30px;
  }

  .sci-btn {
    padding: 10px 0;
    font-size: 13px;
  }

  .sci-main-btns .sci-btn {
    padding: 14px 0;
    font-size: 17px;
  }

  .sci-btns-grid {
    grid-template-columns: repeat(5, 1fr);
  }

  .sci-fn-btn {
    font-size: 11px;
    padding: 5px 0;
  }

  .all-calc-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}