/* Electronegativity & Polarity Checker - Component Styles */

:root {
    --ep-tool: #4f46e5;
    --ep-tool-dark: #4338ca;
    --ep-gradient: linear-gradient(135deg, #4f46e5 0%, #818cf8 100%);
    --ep-light: #eef2ff;
}
[data-theme="dark"] {
    --ep-light: rgba(79, 70, 229, 0.15);
}

/* ===== Output Tabs ===== */
.ep-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;
}
.ep-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;
}
.ep-output-tab.active {
    color: var(--ep-tool);
    background: var(--bg-primary);
}
.ep-output-tab.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--ep-tool);
}
.ep-output-tab:hover:not(.active) {
    background: var(--bg-tertiary);
}

/* ===== Panels ===== */
.ep-panel { display: none; }
.ep-panel.active { display: block; }

/* ===== Input Groups ===== */
.ep-input-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;
}
.ep-input {
    width: 100%;
    padding: 0.625rem 0.75rem;
    font-size: 1rem;
    font-family: var(--font-mono);
    border: 1.5px solid var(--border);
    border-radius: 0.375rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    text-align: left;
    transition: border-color 0.15s;
    box-sizing: border-box;
}
.ep-input:focus {
    outline: none;
    border-color: var(--ep-tool);
    box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.1);
}
.ep-input-hint {
    font-size: 0.6875rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* ===== Quick Examples ===== */
.ep-examples {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}
.ep-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);
}
.ep-example-chip:hover {
    background: var(--ep-light);
    color: var(--ep-tool);
    border-color: var(--ep-tool);
}

/* ===== Verdict Badge ===== */
.ep-verdict-badge {
    display: inline-block;
    padding: 0.375rem 1rem;
    border-radius: 0.75rem;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}
.ep-verdict-polar {
    background: linear-gradient(135deg, #4f46e5 0%, #818cf8 100%);
    color: #fff;
}
.ep-verdict-nonpolar {
    background: linear-gradient(135deg, #059669 0%, #34d399 100%);
    color: #fff;
}
.ep-verdict-ionic {
    background: linear-gradient(135deg, #dc2626 0%, #f87171 100%);
    color: #fff;
}

/* ===== Result Grid ===== */
.ep-result-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    margin: 0.75rem 0;
}
.ep-result-item {
    padding: 0.5rem 0.375rem;
    background: var(--bg-secondary);
    border-radius: 0.5rem;
    text-align: center;
    border: 1px solid var(--border);
}
.ep-result-label {
    font-size: 0.5625rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.125rem;
}
.ep-result-value {
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* ===== Bond Table ===== */
.ep-bond-table-wrap {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    margin: 0.75rem 0;
}
.ep-bond-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.75rem;
}
.ep-bond-table th {
    background: var(--ep-light);
    color: var(--ep-tool-dark);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.625rem;
    padding: 0.5rem 0.625rem;
    text-align: left;
    border-bottom: 1.5px solid var(--border);
}
.ep-bond-table td {
    padding: 0.4375rem 0.625rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
    vertical-align: middle;
}
.ep-bond-table tr:hover td {
    background: var(--bg-tertiary);
}
.ep-bond-type-badge {
    display: inline-block;
    padding: 0.125rem 0.375rem;
    border-radius: 0.25rem;
    font-size: 0.625rem;
    font-weight: 600;
}
.ep-bond-nonpolar { background: #ecfdf5; color: #059669; }
.ep-bond-polar { background: #eef2ff; color: #4f46e5; }
.ep-bond-ionic { background: #fef2f2; color: #dc2626; }
[data-theme="dark"] .ep-bond-table th { background: rgba(79,70,229,0.2); color: #a5b4fc; }
[data-theme="dark"] .ep-bond-table td { color: var(--text-primary); }
[data-theme="dark"] .ep-bond-nonpolar { background: rgba(5,150,105,0.15); color: #6ee7b7; }
[data-theme="dark"] .ep-bond-polar { background: rgba(79,70,229,0.15); color: #a5b4fc; }
[data-theme="dark"] .ep-bond-ionic { background: rgba(220,38,38,0.15); color: #fca5a5; }

/* ===== Verdict Card ===== */
.ep-verdict-card {
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 0.5rem;
    border-left: 3px solid var(--ep-tool);
    margin: 0.75rem 0;
}
.ep-verdict-card h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.375rem;
}
.ep-verdict-card p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

/* ===== 3D Viewer ===== */
.ep-3d-wrapper {
    margin: 0.75rem 0;
}
.ep-3d-viewer {
    height: 380px;
    min-height: 320px;
    position: relative;
    border: 1.5px solid var(--border);
    border-radius: 0.75rem;
    overflow: hidden;
    background: var(--bg-primary);
}
.ep-viewer-controls {
    display: flex;
    gap: 0.25rem;
    padding: 0.375rem 0;
    flex-wrap: wrap;
}
.ep-viewer-ctrl-btn {
    padding: 0.2rem 0.5rem;
    font-size: 0.625rem;
    font-weight: 600;
    font-family: var(--font-sans);
    border: 1px solid var(--border);
    border-radius: 0.375rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
}
.ep-viewer-ctrl-btn:hover {
    background: var(--ep-light);
    color: var(--ep-tool);
    border-color: var(--ep-tool);
}
.ep-viewer-ctrl-btn.active {
    background: var(--ep-gradient);
    color: #fff;
    border-color: transparent;
}
.ep-viewer-hint {
    font-size: 0.5625rem;
    color: var(--text-muted);
    text-align: center;
    padding: 0 0 0.125rem;
}
.ep-3d-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 1rem;
    gap: 0.5rem;
}
.ep-3d-loading-spinner {
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--border);
    border-top-color: var(--ep-tool);
    border-radius: 50%;
    animation: ep-spin 0.8s linear infinite;
}
.ep-3d-loading-text {
    font-size: 0.6875rem;
    color: var(--text-muted);
    font-weight: 500;
}
@keyframes ep-spin {
    to { transform: rotate(360deg); }
}
[data-theme="dark"] .ep-3d-viewer {
    border-color: rgba(148, 163, 184, 0.2);
}

/* ===== Step-by-Step ===== */
.ep-steps-toggle {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 0.625rem;
    margin: 0.5rem 0 0.25rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all 0.15s;
    width: 100%;
    text-align: left;
    font-family: var(--font-sans);
}
.ep-steps-toggle:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.ep-steps-toggle svg { transition: transform 0.2s; width: 14px; height: 14px; flex-shrink: 0; }
.ep-steps-toggle.open svg { transform: rotate(180deg); }
.ep-steps-wrap { overflow: hidden; max-height: 0; transition: max-height 0.3s ease; }
.ep-steps-wrap.open { max-height: 2000px; }
.ep-step {
    display: flex;
    gap: 0.5rem;
    padding: 0.5rem 0.625rem;
    margin: 0.25rem 0;
    background: var(--bg-secondary);
    border-radius: 0.375rem;
    border-left: 2px solid var(--ep-tool);
    transition: background 0.15s;
}
.ep-step:hover { background: var(--bg-tertiary); }
.ep-step-number {
    width: 1.25rem;
    height: 1.25rem;
    border-radius: 50%;
    background: var(--ep-gradient);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.5625rem;
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 0.0625rem;
}
.ep-step-content { flex: 1; min-width: 0; }
.ep-step-desc {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.125rem;
}
.ep-step-math {
    overflow-x: auto;
    font-size: 0.6875rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* ===== Database Table ===== */
.ep-search-input {
    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);
    margin-bottom: 0.75rem;
    box-sizing: border-box;
}
.ep-search-input:focus {
    outline: none;
    border-color: var(--ep-tool);
}
.ep-table-wrap {
    overflow-x: auto;
    max-height: 400px;
    overflow-y: auto;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
}
.ep-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.75rem;
}
.ep-table th {
    position: sticky;
    top: 0;
    background: var(--ep-light);
    color: var(--ep-tool-dark);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.625rem;
    padding: 0.5rem 0.625rem;
    text-align: left;
    border-bottom: 1.5px solid var(--border);
    z-index: 1;
}
.ep-table td {
    padding: 0.4375rem 0.625rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
    vertical-align: middle;
}
.ep-table tr:hover td {
    background: var(--bg-tertiary);
}
.ep-table-btn {
    padding: 0.2rem 0.5rem;
    font-size: 0.625rem;
    font-weight: 600;
    border: 1px solid var(--ep-tool);
    border-radius: 0.25rem;
    background: transparent;
    color: var(--ep-tool);
    cursor: pointer;
    transition: all 0.15s;
    font-family: var(--font-sans);
}
.ep-table-btn:hover {
    background: var(--ep-gradient);
    color: #fff;
    border-color: transparent;
}
.ep-polarity-badge {
    display: inline-block;
    padding: 0.125rem 0.375rem;
    border-radius: 0.25rem;
    font-size: 0.6875rem;
    font-weight: 500;
}
.ep-badge-polar { background: var(--ep-light); color: var(--ep-tool-dark); }
.ep-badge-nonpolar { background: #ecfdf5; color: #059669; }
[data-theme="dark"] .ep-table th { background: rgba(79,70,229,0.2); color: #a5b4fc; }
[data-theme="dark"] .ep-table-btn { color: #a5b4fc; border-color: #a5b4fc; }
[data-theme="dark"] .ep-badge-polar { background: rgba(79,70,229,0.15); color: #a5b4fc; }
[data-theme="dark"] .ep-badge-nonpolar { background: rgba(5,150,105,0.15); color: #6ee7b7; }
[data-theme="dark"] .ep-rule-table th { background: rgba(79,70,229,0.2); color: #a5b4fc; }

/* ===== Educational Content ===== */
.ep-edu-card {
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 0.5rem;
}
.ep-edu-card h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.375rem;
}
.ep-edu-card p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}
.ep-edu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 0.75rem;
    margin: 1rem 0;
}

.ep-callout {
    display: flex;
    gap: 0.75rem;
    padding: 1rem;
    border-radius: 0.5rem;
    margin: 1rem 0;
}
.ep-callout-icon { font-size: 1.25rem; flex-shrink: 0; }
.ep-callout-text { font-size: 0.8125rem; line-height: 1.6; color: var(--text-secondary); }
.ep-callout-insight { background: #eef2ff; border-left: 3px solid #4f46e5; }
.ep-callout-tip { background: #fffbeb; border-left: 3px solid #d97706; }
[data-theme="dark"] .ep-callout-insight { background: rgba(79, 70, 229, 0.1); }
[data-theme="dark"] .ep-callout-tip { background: rgba(217, 119, 6, 0.1); }

/* ===== EN Scale Visual ===== */
.ep-en-scale {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 0.75rem;
    margin: 1rem 0;
    overflow-x: auto;
}
.ep-en-element {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.125rem;
    padding: 0.375rem 0.5rem;
    border-radius: 0.5rem;
    min-width: 3rem;
    text-align: center;
}
.ep-en-symbol {
    font-size: 1rem;
    font-weight: 700;
    font-family: var(--font-mono);
}
.ep-en-value {
    font-size: 0.625rem;
    font-weight: 600;
}

/* ===== Bond Type Visual ===== */
.ep-bond-type-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    margin: 1rem 0;
}
.ep-bond-type-card {
    padding: 1rem;
    border-radius: 0.5rem;
    text-align: center;
    border: 1.5px solid var(--border);
}
.ep-bond-type-card h4 {
    font-size: 0.875rem;
    font-weight: 600;
    margin: 0 0 0.25rem;
}
.ep-bond-type-card .ep-delta {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0.25rem 0;
}
.ep-bond-type-card p {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin: 0;
}

/* ===== Polarity Rule Table ===== */
.ep-rule-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8125rem;
}
.ep-rule-table th {
    background: var(--ep-light);
    color: var(--ep-tool-dark);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    font-size: 0.6875rem;
    padding: 0.625rem 0.75rem;
    text-align: left;
    border-bottom: 2px solid var(--ep-tool);
}
.ep-rule-table td {
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
    vertical-align: middle;
}
.ep-rule-table tr:hover td {
    background: var(--bg-tertiary);
}

/* ===== Section Numbering ===== */
.ep-section-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.75rem;
    height: 1.75rem;
    border-radius: 50%;
    background: var(--ep-gradient);
    color: #fff;
    font-size: 0.8125rem;
    font-weight: 700;
    margin-right: 0.5rem;
    flex-shrink: 0;
}

/* ===== Process Steps ===== */
.ep-process {
    position: relative;
    padding-left: 2.5rem;
}
.ep-process::before {
    content: '';
    position: absolute;
    left: 1.0625rem;
    top: 0.5rem;
    bottom: 0.5rem;
    width: 2px;
    background: linear-gradient(to bottom, var(--ep-tool) 0%, rgba(79,70,229,0.15) 100%);
}
.ep-process-step {
    position: relative;
    padding: 0.75rem 1rem;
    margin-bottom: 0.75rem;
    background: var(--bg-secondary);
    border-radius: 0.5rem;
    border-left: 3px solid var(--ep-tool);
}
.ep-process-step::before {
    content: attr(data-step);
    position: absolute;
    left: -2.5rem;
    top: 0.75rem;
    width: 1.75rem;
    height: 1.75rem;
    border-radius: 50%;
    background: var(--ep-gradient);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    z-index: 1;
}
.ep-process-step h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.25rem;
}
.ep-process-step p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

/* ===== Animations ===== */
.ep-anim {
    opacity: 0;
    transform: translateY(1rem);
    transition: opacity 0.5s ease, transform 0.5s ease;
}
.ep-anim.ep-visible { opacity: 1; transform: translateY(0); }
.ep-anim-d1 { transition-delay: 0.1s; }
.ep-anim-d2 { transition-delay: 0.2s; }
.ep-anim-d3 { transition-delay: 0.3s; }
.ep-anim-d4 { transition-delay: 0.4s; }
.ep-anim-d5 { transition-delay: 0.5s; }
.ep-anim-d6 { transition-delay: 0.6s; }

@keyframes ep-pop {
    0% { transform: scale(0); opacity: 0; }
    70% { transform: scale(1.15); }
    100% { transform: scale(1); opacity: 1; }
}

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

/* ===== Responsive ===== */
@media (max-width: 640px) {
    .ep-3d-viewer {
        height: 260px;
        min-height: 220px;
    }
    .ep-result-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .ep-edu-grid { grid-template-columns: 1fr; }
    .ep-bond-type-grid { grid-template-columns: 1fr; }
    .ep-en-scale { flex-wrap: wrap; }
    .ep-process { padding-left: 2rem; }
    .ep-process-step::before { left: -2rem; width: 1.5rem; height: 1.5rem; font-size: 0.6875rem; }
}