/* Series Calculator - Component Styles */

:root {
    --sc-tool: #2563eb;
    --sc-tool-dark: #1d4ed8;
    --sc-gradient: linear-gradient(135deg, #2563eb 0%, #60a5fa 100%);
    --sc-light: #eff6ff;
}
[data-theme="dark"] {
    --sc-light: rgba(37, 99, 235, 0.15);
}

/* ===== Series Type Toggle ===== */
.sc-type-toggle {
    display: flex;
    border: 1.5px solid var(--border);
    border-radius: 0.5rem;
    overflow: hidden;
    margin-bottom: 1rem;
}
.sc-type-btn {
    flex: 1;
    padding: 0.5rem;
    font-weight: 600;
    font-size: 0.75rem;
    border: none;
    cursor: pointer;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    transition: all 0.15s;
    font-family: var(--font-sans);
    text-align: center;
}
.sc-type-btn.active {
    background: var(--sc-gradient);
    color: #fff;
}
.sc-type-btn:hover:not(.active) {
    background: var(--bg-tertiary);
}
[data-theme="dark"] .sc-type-btn { background: var(--bg-tertiary); }
[data-theme="dark"] .sc-type-btn.active { background: var(--sc-gradient); color: #fff; }

/* ===== Mode Toggle ===== */
.sc-mode-toggle {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.375rem;
    background: var(--bg-secondary);
    padding: 0.375rem;
    border-radius: 0.625rem;
    border: 1.5px solid var(--border);
}
.sc-mode-btn {
    position: relative;
    padding: 0.5rem 0.375rem;
    font-weight: 600;
    font-size: 0.625rem;
    border: 1.5px solid transparent;
    border-radius: 0.5rem;
    cursor: pointer;
    background: transparent;
    color: var(--text-muted);
    transition: all 0.2s ease;
    font-family: var(--font-sans);
    text-align: center;
    white-space: nowrap;
    line-height: 1.3;
}
.sc-mode-btn::before {
    content: '';
    display: block;
    width: 1.5rem;
    height: 1.5rem;
    margin: 0 auto 0.25rem;
    border-radius: 0.375rem;
    background: var(--bg-tertiary);
    transition: all 0.2s ease;
}
/* Mode-specific icons via ::before backgrounds */
.sc-mode-btn[data-mode="expansion"]::before {
    background: linear-gradient(135deg, #2563eb20, #60a5fa30);
    border: 1.5px solid #2563eb30;
}
.sc-mode-btn[data-mode="remainder"]::before {
    background: linear-gradient(135deg, #d9770620, #fbbf2430);
    border: 1.5px solid #d9770630;
}
.sc-mode-btn[data-mode="integral"]::before {
    background: linear-gradient(135deg, #7c3aed20, #a78bfa30);
    border: 1.5px solid #7c3aed30;
}
.sc-mode-btn[data-mode="limit"]::before {
    background: linear-gradient(135deg, #e11d4820, #fb718530);
    border: 1.5px solid #e11d4830;
}
/* Mode icons via ::after (emoji-like symbols) */
.sc-mode-btn::after {
    position: absolute;
    top: 0.5rem;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.75rem;
    font-weight: 700;
    line-height: 1.5rem;
    width: 1.5rem;
    text-align: center;
}
.sc-mode-btn[data-mode="expansion"]::after { content: '\03A3'; color: #2563eb; }
.sc-mode-btn[data-mode="remainder"]::after { content: '\00B1'; color: #d97706; }
.sc-mode-btn[data-mode="integral"]::after  { content: '\222B'; color: #7c3aed; }
.sc-mode-btn[data-mode="limit"]::after     { content: '\2192'; color: #e11d48; }

.sc-mode-btn:hover:not(.active) {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-color: var(--border);
}
/* Active states — each mode gets its own accent */
.sc-mode-btn.active {
    border-color: var(--sc-tool);
    background: var(--sc-light);
    color: var(--sc-tool);
    box-shadow: 0 1px 3px rgba(37, 99, 235, 0.12);
}
.sc-mode-btn[data-mode="expansion"].active {
    --_accent: #2563eb;
    border-color: #2563eb;
    background: #eff6ff;
    color: #2563eb;
    box-shadow: 0 1px 3px rgba(37, 99, 235, 0.15);
}
.sc-mode-btn[data-mode="remainder"].active {
    border-color: #d97706;
    background: #fffbeb;
    color: #92400e;
    box-shadow: 0 1px 3px rgba(217, 119, 6, 0.15);
}
.sc-mode-btn[data-mode="integral"].active {
    border-color: #7c3aed;
    background: #f5f3ff;
    color: #5b21b6;
    box-shadow: 0 1px 3px rgba(124, 58, 237, 0.15);
}
.sc-mode-btn[data-mode="limit"].active {
    border-color: #e11d48;
    background: #fff1f2;
    color: #9f1239;
    box-shadow: 0 1px 3px rgba(225, 29, 72, 0.15);
}
.sc-mode-btn.active::before {
    transform: scale(1.05);
}
.sc-mode-btn[data-mode="expansion"].active::before {
    background: linear-gradient(135deg, #2563eb30, #60a5fa50);
    border-color: #2563eb60;
}
.sc-mode-btn[data-mode="remainder"].active::before {
    background: linear-gradient(135deg, #d9770630, #fbbf2450);
    border-color: #d9770660;
}
.sc-mode-btn[data-mode="integral"].active::before {
    background: linear-gradient(135deg, #7c3aed30, #a78bfa50);
    border-color: #7c3aed60;
}
.sc-mode-btn[data-mode="limit"].active::before {
    background: linear-gradient(135deg, #e11d4830, #fb718550);
    border-color: #e11d4860;
}

/* Dark mode overrides for mode toggle */
[data-theme="dark"] .sc-mode-toggle {
    background: var(--bg-tertiary);
    border-color: var(--border);
}
[data-theme="dark"] .sc-mode-btn { color: var(--text-muted); }
[data-theme="dark"] .sc-mode-btn:hover:not(.active) { background: rgba(255,255,255,0.05); }
[data-theme="dark"] .sc-mode-btn[data-mode="expansion"].active { background: rgba(37,99,235,0.15); color: #60a5fa; border-color: #2563eb80; }
[data-theme="dark"] .sc-mode-btn[data-mode="remainder"].active { background: rgba(217,119,6,0.15); color: #fbbf24; border-color: #d9770680; }
[data-theme="dark"] .sc-mode-btn[data-mode="integral"].active  { background: rgba(124,58,237,0.15); color: #a78bfa; border-color: #7c3aed80; }
[data-theme="dark"] .sc-mode-btn[data-mode="limit"].active     { background: rgba(225,29,72,0.15); color: #fb7185; border-color: #e11d4880; }
[data-theme="dark"] .sc-mode-btn::before { background: rgba(255,255,255,0.05); border-color: rgba(255,255,255,0.1); }
[data-theme="dark"] .sc-mode-btn[data-mode="expansion"].active::before { background: rgba(37,99,235,0.2); border-color: rgba(37,99,235,0.4); }
[data-theme="dark"] .sc-mode-btn[data-mode="remainder"].active::before { background: rgba(217,119,6,0.2); border-color: rgba(217,119,6,0.4); }
[data-theme="dark"] .sc-mode-btn[data-mode="integral"].active::before  { background: rgba(124,58,237,0.2); border-color: rgba(124,58,237,0.4); }
[data-theme="dark"] .sc-mode-btn[data-mode="limit"].active::before     { background: rgba(225,29,72,0.2); border-color: rgba(225,29,72,0.4); }

/* ===== Mode-Specific Input Groups ===== */
.sc-mode-inputs {
    margin-top: 0.75rem;
    padding: 0.75rem;
    border-radius: 0.5rem;
    animation: sc-slideDown 0.25s ease-out;
}
.sc-mode-inputs .tool-form-hint {
    margin-top: 0.5rem;
    font-size: 0.6875rem;
    line-height: 1.5;
}
.sc-mode-inputs .sc-param-row {
    margin-bottom: 0;
}
/* Color-coded input containers */
#sc-remainder-inputs {
    background: #fffbeb;
    border: 1.5px solid #fde68a;
    border-top: 3px solid #d97706;
}
#sc-integral-inputs {
    background: #f5f3ff;
    border: 1.5px solid #ddd6fe;
    border-top: 3px solid #7c3aed;
}
#sc-limit-inputs {
    background: #fff1f2;
    border: 1.5px solid #fecdd3;
    border-top: 3px solid #e11d48;
}
#sc-remainder-inputs .sc-param-label { color: #92400e; }
#sc-integral-inputs .sc-param-label  { color: #5b21b6; }
#sc-limit-inputs .sc-param-label     { color: #9f1239; }
#sc-remainder-inputs .sc-param-input:focus { border-color: #d97706; box-shadow: 0 0 0 2px rgba(217,119,6,0.15); }
#sc-integral-inputs .sc-param-input:focus  { border-color: #7c3aed; box-shadow: 0 0 0 2px rgba(124,58,237,0.15); }
#sc-limit-inputs .sc-param-input:focus     { border-color: #e11d48; box-shadow: 0 0 0 2px rgba(225,29,72,0.15); }
#sc-limit-inputs .sc-func-input:focus      { border-color: #e11d48; box-shadow: 0 0 0 3px rgba(225,29,72,0.1); }
/* Dark mode input containers */
[data-theme="dark"] #sc-remainder-inputs { background: rgba(217,119,6,0.08); border-color: rgba(217,119,6,0.2); border-top-color: #d97706; }
[data-theme="dark"] #sc-integral-inputs  { background: rgba(124,58,237,0.08); border-color: rgba(124,58,237,0.2); border-top-color: #7c3aed; }
[data-theme="dark"] #sc-limit-inputs     { background: rgba(225,29,72,0.08); border-color: rgba(225,29,72,0.2); border-top-color: #e11d48; }
[data-theme="dark"] #sc-remainder-inputs .sc-param-label { color: #fbbf24; }
[data-theme="dark"] #sc-integral-inputs .sc-param-label  { color: #a78bfa; }
[data-theme="dark"] #sc-limit-inputs .sc-param-label     { color: #fb7185; }

@keyframes sc-slideDown {
    from { opacity: 0; transform: translateY(-0.5rem); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ===== Result Accent Boxes ===== */
.sc-remainder-box,
.sc-integral-box,
.sc-limit-box {
    padding: 1rem 1.25rem;
    border-radius: 0.625rem;
    margin: 0.75rem 0;
}
.sc-remainder-box {
    border-left: 4px solid #d97706;
    background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
}
.sc-integral-box {
    border-left: 4px solid #7c3aed;
    background: linear-gradient(135deg, #f5f3ff 0%, #ede9fe 100%);
}
.sc-limit-box {
    border-left: 4px solid #e11d48;
    background: linear-gradient(135deg, #fff1f2 0%, #ffe4e6 100%);
}
.sc-remainder-box h4,
.sc-integral-box h4,
.sc-limit-box h4 {
    font-size: 0.8125rem;
    font-weight: 700;
    margin: 0 0 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    letter-spacing: 0.01em;
}
.sc-remainder-box h4 { color: #92400e; }
.sc-integral-box h4  { color: #5b21b6; }
.sc-limit-box h4     { color: #9f1239; }
.sc-remainder-box h4::before { content: '\00B1'; font-size: 1.1rem; }
.sc-integral-box h4::before  { content: '\222B'; font-size: 1.1rem; }
.sc-limit-box h4::before     { content: '\2192'; font-size: 1.1rem; }
.sc-remainder-box .sc-step-math,
.sc-integral-box .sc-step-math,
.sc-limit-box .sc-step-math {
    overflow-x: auto;
    padding: 0.375rem 0;
}

/* Result data rows */
.sc-result-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    padding: 0.375rem 0;
    border-bottom: 1px dashed rgba(0,0,0,0.06);
}
.sc-result-row:last-child { border-bottom: none; }
.sc-result-row strong {
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.875rem;
}
.sc-result-comparison {
    display: flex;
    gap: 0.75rem;
    margin-top: 0.75rem;
    font-size: 0.8125rem;
}
.sc-result-comparison > div {
    flex: 1;
    padding: 0.625rem;
    background: rgba(255,255,255,0.6);
    border: 1px solid rgba(0,0,0,0.06);
    border-radius: 0.5rem;
    text-align: center;
}

/* Dark mode result boxes */
[data-theme="dark"] .sc-remainder-box { background: linear-gradient(135deg, rgba(217,119,6,0.1), rgba(217,119,6,0.05)); border-left-color: #d97706; }
[data-theme="dark"] .sc-integral-box  { background: linear-gradient(135deg, rgba(124,58,237,0.1), rgba(124,58,237,0.05)); border-left-color: #7c3aed; }
[data-theme="dark"] .sc-limit-box     { background: linear-gradient(135deg, rgba(225,29,72,0.1), rgba(225,29,72,0.05)); border-left-color: #e11d48; }
[data-theme="dark"] .sc-remainder-box h4 { color: #fbbf24; }
[data-theme="dark"] .sc-integral-box h4  { color: #a78bfa; }
[data-theme="dark"] .sc-limit-box h4     { color: #fb7185; }
[data-theme="dark"] .sc-result-row { border-bottom-color: rgba(255,255,255,0.06); }
[data-theme="dark"] .sc-result-comparison > div { background: rgba(255,255,255,0.05); border-color: rgba(255,255,255,0.08); }

/* ===== Function Input ===== */
.sc-func-input {
    width: 100%;
    padding: 0.625rem 0.75rem;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    border: 1.5px solid var(--border);
    border-radius: 0.5rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color 0.15s;
}
.sc-func-input:focus {
    outline: none;
    border-color: var(--sc-tool);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}
.sc-func-input::placeholder {
    color: var(--text-muted);
    font-family: var(--font-sans);
}

/* ===== Autocomplete Dropdown ===== */
.sc-func-input-wrap {
    position: relative;
}
.sc-func-autocomplete {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: var(--z-dropdown, 1000);
    max-height: 260px;
    overflow-y: auto;
    background: var(--bg-primary);
    border: 1.5px solid var(--sc-tool);
    border-top: none;
    border-radius: 0 0 0.5rem 0.5rem;
    box-shadow: var(--shadow-lg, 0 10px 25px rgba(0,0,0,0.1));
}
.sc-func-autocomplete.active {
    display: block;
}
.sc-func-ac-item {
    display: flex;
    align-items: center;
    padding: 0.5rem 0.75rem;
    cursor: pointer;
    transition: background 0.1s;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--text-primary);
}
.sc-func-ac-item:hover,
.sc-func-ac-item.selected {
    background: var(--sc-light);
}
.sc-func-ac-cat {
    margin-left: auto;
    padding: 0.125rem 0.5rem;
    font-size: 0.625rem;
    font-weight: 600;
    font-family: var(--font-sans);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    border-radius: 2rem;
    background: var(--bg-tertiary, var(--bg-secondary));
    color: var(--text-muted);
    white-space: nowrap;
    flex-shrink: 0;
}
[data-theme="dark"] .sc-func-autocomplete {
    background: var(--bg-secondary);
    border-color: var(--sc-tool);
    box-shadow: 0 10px 25px rgba(0,0,0,0.3);
}
[data-theme="dark"] .sc-func-ac-item:hover,
[data-theme="dark"] .sc-func-ac-item.selected {
    background: var(--sc-light);
}
[data-theme="dark"] .sc-func-ac-cat {
    background: var(--bg-tertiary);
    color: var(--text-muted);
}

/* ===== Function Palette ===== */
.sc-func-palette {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    margin-top: 0.375rem;
}
.sc-palette-btn {
    padding: 0.25rem 0.5rem;
    font-size: 0.6875rem;
    font-weight: 600;
    font-family: var(--font-mono);
    border: 1px solid var(--border);
    border-radius: 0.25rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
    line-height: 1.2;
}
.sc-palette-btn:hover {
    background: var(--sc-light);
    color: var(--sc-tool);
    border-color: var(--sc-tool);
}
.sc-palette-btn:active {
    transform: scale(0.95);
}
[data-theme="dark"] .sc-palette-btn {
    background: var(--bg-tertiary);
}

/* ===== Parameter Row ===== */
.sc-param-row {
    display: flex;
    gap: 0.5rem;
    align-items: flex-end;
    margin-bottom: 0.5rem;
}
.sc-param-group {
    flex: 1;
    min-width: 0;
}
.sc-param-label {
    display: block;
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}
.sc-param-input {
    width: 100%;
    padding: 0.5rem 0.5rem;
    font-size: 0.8125rem;
    font-family: var(--font-mono);
    border: 1.5px solid var(--border);
    border-radius: 0.375rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color 0.15s;
    text-align: center;
}
.sc-param-input:focus {
    outline: none;
    border-color: var(--sc-tool);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}

/* ===== Method Select ===== */
.sc-method-select {
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 0.8125rem;
    border: 1.5px solid var(--border);
    border-radius: 0.375rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    cursor: pointer;
    transition: border-color 0.15s;
}
.sc-method-select:focus {
    outline: none;
    border-color: var(--sc-tool);
}

/* ===== Result Content Overflow ===== */
#sc-result-content {
    overflow-x: auto;
    overflow-y: auto;
}
#sc-result-content .katex-display {
    overflow-x: auto;
    overflow-y: hidden;
}

/* ===== Live KaTeX Preview ===== */
.sc-preview {
    min-height: 2.5rem;
    padding: 0.5rem 0.75rem;
    border: 1.5px dashed var(--border);
    border-radius: 0.5rem;
    background: var(--bg-secondary);
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow-x: auto;
}
.sc-preview .katex { font-size: 1em; }

/* ===== Output Tabs ===== */
.sc-output-tabs {
    display: flex;
    border-bottom: 1.5px solid var(--border);
    background: var(--bg-secondary);
    border-radius: 0.75rem 0.75rem 0 0;
    overflow: hidden;
}
.sc-output-tab {
    flex: 1;
    padding: 0.625rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    background: transparent;
    color: var(--text-secondary);
    transition: all 0.15s;
    font-family: var(--font-sans);
    text-align: center;
    position: relative;
}
.sc-output-tab.active {
    color: var(--sc-tool);
    background: var(--bg-primary);
}
.sc-output-tab.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--sc-tool);
}
.sc-output-tab:hover:not(.active) {
    background: var(--bg-tertiary);
}

/* ===== Output Panels ===== */
.sc-panel {
    display: none;
}
.sc-panel.active {
    display: block;
}
#sc-panel-result.active {
    display: flex;
    flex-direction: column;
    max-height: 80vh;
}

/* ===== Scrollable Result Container ===== */
.sc-result-scroll-container {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 0 1px;
    scrollbar-width: thin;
    scrollbar-color: var(--sc-tool) transparent;
}
.sc-result-scroll-container::-webkit-scrollbar {
    width: 5px;
}
.sc-result-scroll-container::-webkit-scrollbar-track {
    background: transparent;
}
.sc-result-scroll-container::-webkit-scrollbar-thumb {
    background: var(--sc-tool);
    border-radius: 3px;
}
.sc-result-scroll-container::-webkit-scrollbar-thumb:hover {
    background: var(--sc-tool-dark);
}

/* ===== Sticky Action Toolbar ===== */
.sc-result-toolbar {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.625rem 0.75rem;
    border-top: 1.5px solid var(--border);
    background: var(--bg-secondary);
    border-radius: 0 0 0.75rem 0.75rem;
    flex-shrink: 0;
}
.sc-toolbar-group {
    display: flex;
    gap: 0.25rem;
}
.sc-toolbar-sep {
    width: 1px;
    height: 1.25rem;
    background: var(--border);
    margin: 0 0.25rem;
    flex-shrink: 0;
}
.sc-toolbar-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.375rem 0.625rem;
    font-size: 0.6875rem;
    font-weight: 600;
    font-family: var(--font-sans);
    border: 1px solid var(--border);
    border-radius: 0.375rem;
    background: var(--bg-primary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
    white-space: nowrap;
    line-height: 1;
}
.sc-toolbar-btn:hover {
    background: var(--sc-light);
    color: var(--sc-tool);
    border-color: var(--sc-tool);
}
.sc-toolbar-btn:active {
    transform: scale(0.97);
}
.sc-toolbar-btn svg {
    flex-shrink: 0;
}
[data-theme="dark"] .sc-result-toolbar {
    background: var(--bg-tertiary);
}
[data-theme="dark"] .sc-toolbar-btn {
    background: var(--bg-secondary);
    border-color: var(--border);
    color: var(--text-secondary);
}
[data-theme="dark"] .sc-toolbar-btn:hover {
    background: var(--sc-light);
    color: var(--sc-tool);
    border-color: var(--sc-tool);
}

/* ===== Steps CTA Button ===== */
.sc-steps-toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    font-family: var(--font-sans);
    color: #fff;
    background: var(--sc-gradient);
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: opacity 0.15s, transform 0.15s;
}
.sc-steps-toggle-btn:hover {
    opacity: 0.9;
}
.sc-steps-toggle-btn:active {
    transform: scale(0.98);
}
.sc-steps-toggle-btn svg {
    transition: transform 0.2s;
}
.sc-steps-toggle-btn.open svg {
    transform: rotate(90deg);
}

/* ===== Steps Header ===== */
.sc-steps-header {
    padding: 1rem 1.25rem;
    background: var(--sc-light);
    border-radius: 0.75rem;
    border: 1.5px solid rgba(37, 99, 235, 0.2);
    margin-bottom: 0.5rem;
}
.sc-steps-header h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--sc-tool);
    margin: 0 0 0.25rem;
}
.sc-steps-header p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Mode-specific steps header accents */
.sc-steps-header--remainder {
    background: #fffbeb;
    border-color: rgba(217, 119, 6, 0.3);
}
.sc-steps-header--remainder h4 { color: #d97706; }

.sc-steps-header--integral {
    background: #f5f3ff;
    border-color: rgba(124, 58, 237, 0.3);
}
.sc-steps-header--integral h4 { color: #7c3aed; }

.sc-steps-header--limit {
    background: #fff1f2;
    border-color: rgba(225, 29, 72, 0.3);
}
.sc-steps-header--limit h4 { color: #e11d48; }

[data-theme="dark"] .sc-steps-header--remainder {
    background: rgba(217, 119, 6, 0.12);
    border-color: rgba(217, 119, 6, 0.25);
}
[data-theme="dark"] .sc-steps-header--remainder h4 { color: #fbbf24; }

[data-theme="dark"] .sc-steps-header--integral {
    background: rgba(124, 58, 237, 0.12);
    border-color: rgba(124, 58, 237, 0.25);
}
[data-theme="dark"] .sc-steps-header--integral h4 { color: #a78bfa; }

[data-theme="dark"] .sc-steps-header--limit {
    background: rgba(225, 29, 72, 0.12);
    border-color: rgba(225, 29, 72, 0.25);
}
[data-theme="dark"] .sc-steps-header--limit h4 { color: #fb7185; }

/* ===== Step-by-Step ===== */
.sc-step {
    display: flex;
    gap: 0.75rem;
    padding: 0.75rem;
    margin: 0.5rem 0;
    background: var(--bg-secondary);
    border-radius: 0.5rem;
    border-left: 3px solid var(--sc-tool);
    transition: background 0.15s;
}
.sc-step:hover {
    background: var(--bg-tertiary);
}
.sc-step-number {
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    background: var(--sc-gradient);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.6875rem;
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 0.125rem;
}
.sc-step-content {
    flex: 1;
    min-width: 0;
}
.sc-step-desc {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.375rem;
}
.sc-step-math {
    overflow-x: auto;
    padding: 0.25rem 0;
}
.sc-step-math .katex { font-size: 0.9em; }
.sc-step-math .katex-display { margin: 0; overflow-x: auto; overflow-y: hidden; }
.sc-step-derivative {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
    overflow-x: auto;
}
.sc-step-derivative .katex { font-size: 0.85em; }

/* ===== Term Badge ===== */
.sc-term-badge {
    display: inline-block;
    background: var(--sc-gradient);
    color: #fff;
    padding: 0.125rem 0.5rem;
    border-radius: 0.75rem;
    font-size: 0.6875rem;
    font-weight: 600;
    margin-left: 0.5rem;
    vertical-align: middle;
}

/* ===== Convergence Box ===== */
.sc-convergence {
    padding: 1rem;
    background: #f0fdf4;
    border-left: 3px solid #22c55e;
    border-radius: 0.5rem;
    margin-top: 1rem;
}
[data-theme="dark"] .sc-convergence {
    background: rgba(34, 197, 94, 0.1);
}
.sc-convergence h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: #15803d;
    margin: 0 0 0.5rem;
}
[data-theme="dark"] .sc-convergence h4 { color: #4ade80; }
.sc-convergence p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

/* ===== Term Slider ===== */
.sc-slider-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border-radius: 0.5rem;
    margin-top: 0.75rem;
}
.sc-slider-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
}
.sc-slider {
    flex: 1;
    -webkit-appearance: none;
    height: 4px;
    border-radius: 2px;
    background: var(--border);
    outline: none;
}
.sc-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--sc-tool);
    cursor: pointer;
}
.sc-slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--sc-tool);
    cursor: pointer;
    border: none;
}
.sc-slider-value {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--sc-tool);
    min-width: 1.5rem;
    text-align: center;
}

/* ===== Quick Example Chips ===== */
.sc-examples {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}
.sc-example-chip {
    padding: 0.3rem 0.625rem;
    font-size: 0.6875rem;
    font-weight: 500;
    border-radius: 2rem;
    border: 1px solid var(--border);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
    font-family: var(--font-mono);
}
.sc-example-chip:hover {
    background: var(--sc-light);
    color: var(--sc-tool);
    border-color: var(--sc-tool);
}

/* ===== Series Formula Display ===== */
.sc-formula-box {
    background: #fefce8;
    border: 1.5px solid #fde047;
    border-radius: 0.5rem;
    padding: 0.75rem;
    text-align: center;
    margin: 0.5rem 0;
}
[data-theme="dark"] .sc-formula-box {
    background: rgba(253, 224, 71, 0.1);
    border-color: rgba(253, 224, 71, 0.3);
}
.sc-formula-box .katex { font-size: 1em; }

/* ===== Educational Content ===== */
.sc-concept-hero {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    padding: 1.5rem 1rem;
    margin: 1rem 0;
    background: var(--bg-secondary);
    border-radius: 0.75rem;
}
.sc-concept-block {
    text-align: center;
}
.sc-concept-symbol {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 0.25rem;
}
.sc-concept-label {
    font-size: 0.625rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.sc-c-fn { color: #2563eb; }
.sc-c-deriv { color: #7c3aed; }
.sc-c-fact { color: #059669; }
.sc-c-power { color: #dc2626; }
.sc-c-eq { color: var(--text-muted); font-size: 1.25rem; }

/* ===== Common Series Cards ===== */
.sc-series-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.75rem;
    margin: 1rem 0;
}
.sc-series-card {
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 0.5rem;
    border-left: 3px solid var(--sc-tool);
}
.sc-series-card h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.375rem;
    display: flex;
    align-items: center;
    gap: 0.375rem;
}
.sc-series-card p {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.5;
    font-family: var(--font-mono);
}

/* ===== Callouts ===== */
.sc-callout {
    display: flex;
    gap: 0.75rem;
    padding: 1rem;
    border-radius: 0.5rem;
    margin: 1rem 0;
}
.sc-callout-icon { font-size: 1.25rem; flex-shrink: 0; }
.sc-callout-text { font-size: 0.8125rem; line-height: 1.6; color: var(--text-secondary); }
.sc-callout-insight { background: #eff6ff; border-left: 3px solid #2563eb; }
.sc-callout-tip { background: #ecfdf5; border-left: 3px solid #10b981; }
[data-theme="dark"] .sc-callout-insight { background: rgba(37, 99, 235, 0.1); }
[data-theme="dark"] .sc-callout-tip { background: rgba(16, 185, 129, 0.1); }

/* ===== Educational Grid ===== */
.sc-edu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 0.75rem;
}
.sc-edu-card {
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 0.5rem;
}
.sc-edu-card h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.375rem;
}
.sc-edu-card p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

/* ===== SymPy Spinner ===== */
.sc-sympy-spinner {
    width: 20px;
    height: 20px;
    border: 3px solid var(--border);
    border-top-color: var(--sc-tool);
    border-radius: 50%;
    animation: sc-spin 0.6s linear infinite;
    margin: 0 auto;
}
@keyframes sc-spin {
    to { transform: rotate(360deg); }
}

/* ===== Animations ===== */
@keyframes sc-fadeInUp {
    from { opacity: 0; transform: translateY(1rem); }
    to { opacity: 1; transform: translateY(0); }
}
.sc-anim {
    opacity: 0;
    transform: translateY(1rem);
    transition: opacity 0.5s ease, transform 0.5s ease;
}
.sc-anim.sc-visible {
    opacity: 1;
    transform: translateY(0);
}
.sc-anim-d1 { transition-delay: 0.1s; }
.sc-anim-d2 { transition-delay: 0.2s; }
.sc-anim-d3 { transition-delay: 0.3s; }
.sc-anim-d4 { transition-delay: 0.4s; }
.sc-anim-d5 { transition-delay: 0.5s; }

@media (prefers-reduced-motion: reduce) {
    .sc-anim {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

/* ===== Worksheet Button ===== */
.sc-worksheet-btn {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
    font-weight: 600;
    border: 1.5px solid var(--sc-tool);
    border-radius: 0.5rem;
    background: transparent;
    color: var(--sc-tool);
    cursor: pointer;
    transition: all 0.15s;
    font-family: var(--font-sans);
}
.sc-worksheet-btn:hover {
    background: var(--sc-tool);
    color: #fff;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
    .sc-mode-toggle { grid-template-columns: repeat(2, 1fr); }
    .sc-mode-btn { font-size: 0.625rem; padding: 0.4rem 0.25rem; }
    .sc-mode-btn::before { width: 1.25rem; height: 1.25rem; }
    .sc-mode-btn::after { font-size: 0.625rem; line-height: 1.25rem; width: 1.25rem; top: 0.4rem; }
    .sc-mode-inputs { padding: 0.625rem; }
    .sc-param-row { flex-direction: column; gap: 0.375rem; }
    .sc-series-grid { grid-template-columns: 1fr; }
    .sc-edu-grid { grid-template-columns: 1fr; }
    #sc-panel-result.active { max-height: 70vh; }
    .sc-toolbar-btn { padding: 0.35rem 0.5rem; font-size: 0.625rem; }
    .sc-remainder-box, .sc-integral-box, .sc-limit-box { padding: 0.75rem; }
    .sc-result-comparison { flex-direction: column; gap: 0.5rem; }
}