*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg: #0f1117;
    --card: #1a1d27;
    --card-border: #2a2d3a;
    --text: #e4e6ed;
    --text-muted: #8b8fa3;
    --accent: #6c8cff;
    --accent-hover: #8ba3ff;
    --green: #4caf84;
    --green-bg: rgba(76,175,132,0.12);
    --red: #e85d6f;
    --red-bg: rgba(232,93,111,0.12);
    --orange: #e8a44c;
    --orange-bg: rgba(232,164,76,0.12);
    --yellow: #d4c94c;
    --yellow-bg: rgba(212,201,76,0.12);
    --blue: #4ca8e8;
    --blue-bg: rgba(76,168,232,0.12);
    --purple: #a06ce8;
    --purple-bg: rgba(160,108,232,0.12);
    --radius: 12px;
    --radius-sm: 8px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

#app {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px 16px 40px;
}

header {
    text-align: center;
    margin-bottom: 24px;
    padding: 28px 0 20px;
}

header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--accent), var(--purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 6px;
}

.author-header {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-top: 4px;
    font-style: italic;
}

.card {
    background: var(--card);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 16px;
}

.step-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.step-num {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    font-weight: 700;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.step-header h2 {
    font-size: 1.15rem;
    font-weight: 600;
}

/* Advanced settings */
.advanced-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    color: var(--text-muted);
    font-size: 0.85rem;
    cursor: pointer;
    user-select: none;
    transition: color 0.2s;
}

.advanced-toggle:hover {
    color: var(--accent);
}

#adv-arrow {
    font-size: 0.7rem;
    transition: transform 0.2s;
}

#adv-arrow.open {
    transform: rotate(90deg);
}

.adv-desc {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.adv-grid {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.adv-item > label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 6px;
}

.adv-options {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.adv-radio {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    cursor: pointer;
    padding: 6px 12px;
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
    transition: all 0.15s;
}

.adv-radio:has(input:checked) {
    border-color: var(--accent);
    background: rgba(108,140,255,0.08);
}

.adv-radio input[type="radio"] {
    accent-color: var(--accent);
    margin: 0;
    cursor: pointer;
}

.adv-src {
    font-size: 0.72rem;
    color: var(--text-muted);
    text-decoration: none;
    opacity: 0.7;
    margin-left: 2px;
}

.adv-src:hover {
    color: var(--accent);
    opacity: 1;
}

/* Sample type row */
.sample-row {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.sample-row .toggle-btn {
    padding: 8px 20px;
    font-size: 0.85rem;
}

/* Input sections & collapsible groups */
.input-section {
    margin-bottom: 4px;
}

.input-section-label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--accent);
    margin-bottom: 10px;
    padding-top: 12px;
}

.collapsible .input-section-label {
    border-top: 1px solid var(--card-border);
    padding-top: 14px;
    margin-bottom: 0;
}

.toggle-section {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    user-select: none;
    transition: color 0.15s;
}

.toggle-section:hover {
    color: var(--text);
}

.toggle-section .optional {
    margin-left: auto;
}

.section-arrow {
    font-size: 0.6rem;
    transition: transform 0.2s;
    color: var(--text-muted);
}

.collapsible.open .section-arrow {
    transform: rotate(90deg);
}

.collapsible .section-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    padding-top: 0;
}

.collapsible.open .section-body {
    max-height: 300px;
    padding-top: 12px;
}

/* Toggle buttons */
.toggle-group {
    display: flex;
    gap: 8px;
}

.toggle-btn {
    flex: 1;
    padding: 12px;
    border: 2px solid var(--card-border);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.toggle-btn:hover {
    border-color: var(--accent);
    color: var(--text);
}

.toggle-btn.active {
    border-color: var(--accent);
    background: rgba(108,140,255,0.12);
    color: var(--accent);
}

/* Info box */
.info-box {
    margin-top: 16px;
    padding: 14px 16px;
    background: var(--blue-bg);
    border: 1px solid rgba(76,168,232,0.25);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--blue);
}

.info-box ul {
    margin: 6px 0 6px 18px;
}

.info-box li {
    margin: 3px 0;
}

.info-box .source {
    margin-top: 8px;
    font-size: 0.8rem;
    opacity: 0.8;
}

.info-box a {
    color: var(--blue);
}

/* Input grid */
.input-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.input-group label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text);
}

.optional {
    color: var(--text-muted);
    font-weight: 400;
    font-size: 0.75rem;
}

.input-group input {
    padding: 10px 12px;
    border: 2px solid var(--card-border);
    border-radius: var(--radius-sm);
    background: var(--bg);
    color: var(--text);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s;
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent);
}

.input-group input::placeholder {
    color: #555;
}

.input-group select {
    padding: 10px 12px;
    border: 2px solid var(--card-border);
    border-radius: var(--radius-sm);
    background: var(--bg);
    color: var(--text);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s;
    cursor: pointer;
}

.input-group select:focus {
    outline: none;
    border-color: var(--accent);
}

/* Unit slider toggle */
.unit-slider-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
}

.unit-slider {
    position: relative;
    display: flex;
    border-radius: 20px;
    border: 1px solid var(--card-border);
    background: var(--bg);
    overflow: hidden;
    flex-shrink: 0;
}

.unit-track {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.unit-highlight {
    position: absolute;
    top: 2px;
    bottom: 2px;
    width: calc(50% - 3px);
    left: 2px;
    border-radius: 16px;
    background: var(--accent);
    opacity: 0.15;
    transition: left 0.25s ease;
}

.unit-slider[data-pos="1"] .unit-highlight {
    left: calc(50% + 1px);
}

.unit-opt {
    position: relative;
    z-index: 1;
    padding: 4px 10px;
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.2s;
    user-select: none;
    white-space: nowrap;
}

.unit-opt:hover {
    color: var(--text);
}

.unit-opt.active {
    color: var(--accent);
    font-weight: 600;
}

/* Acuity slider */
.acuity-slider-wrap {
    padding: 2px 0;
}

.acuity-slider {
    position: relative;
    display: flex;
    border-radius: var(--radius-sm);
    border: 1px solid var(--card-border);
    background: var(--bg);
    overflow: hidden;
}

.acuity-track {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.acuity-highlight {
    position: absolute;
    top: 3px;
    bottom: 3px;
    width: calc(100% / 3 - 4px);
    left: 2px;
    border-radius: 6px;
    background: var(--accent);
    opacity: 0.15;
    transition: left 0.25s ease, background 0.25s;
}

.acuity-slider[data-pos="0"] .acuity-highlight { left: 2px; }
.acuity-slider[data-pos="1"] .acuity-highlight { left: calc(100% / 3 + 2px); }
.acuity-slider[data-pos="2"] .acuity-highlight { left: calc(200% / 3 + 2px); }

.acuity-option {
    flex: 1;
    position: relative;
    z-index: 1;
    padding: 10px 8px;
    text-align: center;
    font-size: 0.82rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.2s;
    user-select: none;
}

.acuity-option:hover {
    color: var(--text);
}

.acuity-option.active {
    color: var(--accent);
    font-weight: 600;
}

.acuity-sub {
    display: block;
    font-size: 0.68rem;
    font-weight: 400;
    opacity: 0.6;
    margin-top: 1px;
}

.normal-range {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Buttons */
.btn-row {
    display: flex;
    gap: 10px;
}

.btn-primary {
    display: block;
    flex: 1;
    padding: 14px;
    border: none;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--accent), var(--purple));
    color: #fff;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s, transform 0.1s;
}

.btn-primary:hover {
    opacity: 0.9;
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-secondary {
    padding: 14px 24px;
    border: 2px solid var(--card-border);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-secondary:hover {
    border-color: var(--red);
    color: var(--red);
}

/* Warning box */
.warning-box {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    background: var(--orange-bg);
    border: 1px solid rgba(232,164,76,0.3);
    color: var(--orange);
    font-size: 0.85rem;
    margin-bottom: 12px;
}

.warning-box p {
    margin: 3px 0;
}

/* Summary Banner */
#summary-banner {
    padding: 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    font-size: 1rem;
    font-weight: 600;
}

.banner-acidemia {
    background: var(--red-bg);
    border: 1px solid rgba(232,93,111,0.3);
    color: var(--red);
}

.banner-alkalemia {
    background: var(--purple-bg);
    border: 1px solid rgba(160,108,232,0.3);
    color: var(--purple);
}

.banner-normal {
    background: var(--green-bg);
    border: 1px solid rgba(76,175,132,0.3);
    color: var(--green);
}

.banner-subtitle {
    display: block;
    font-weight: 400;
    font-size: 0.85rem;
    margin-top: 4px;
    opacity: 0.85;
}

/* Calculated values grid */
.calc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 10px;
    margin-bottom: 20px;
}

.calc-item {
    padding: 12px;
    border-radius: var(--radius-sm);
    background: var(--bg);
    border: 1px solid var(--card-border);
}

.calc-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.calc-value {
    font-size: 1.3rem;
    font-weight: 700;
    margin-top: 2px;
}

.calc-note {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 2px;
}

.val-high { color: var(--red); }
.val-low { color: var(--blue); }
.val-normal { color: var(--green); }
.val-warn { color: var(--orange); }

/* Analysis steps */
.analysis-step {
    padding: 16px;
    border-radius: var(--radius-sm);
    background: var(--bg);
    border: 1px solid var(--card-border);
    margin-bottom: 10px;
}

.analysis-step h4 {
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--accent);
}

.analysis-step p {
    font-size: 0.9rem;
    line-height: 1.5;
}

.analysis-step .formula {
    display: inline-block;
    margin: 6px 0;
    padding: 6px 12px;
    background: rgba(108,140,255,0.08);
    border-radius: 6px;
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.85rem;
    color: var(--accent);
}

.finding {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 0.82rem;
    font-weight: 600;
    margin: 2px 4px 2px 0;
}

.finding-acidosis { background: var(--red-bg); color: var(--red); }
.finding-alkalosis { background: var(--purple-bg); color: var(--purple); }
.finding-normal { background: var(--green-bg); color: var(--green); }
.finding-mixed { background: var(--orange-bg); color: var(--orange); }
.finding-info { background: var(--blue-bg); color: var(--blue); }

/* DDx */
#ddx-section h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.ddx-instruction {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 14px;
}

#ddx-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.filter-btn {
    padding: 6px 14px;
    border: 1px solid var(--card-border);
    border-radius: 20px;
    background: transparent;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.82rem;
    cursor: pointer;
    transition: all 0.2s;
}

.filter-btn:hover {
    border-color: var(--accent);
    color: var(--text);
}

.filter-btn.active {
    background: rgba(108,140,255,0.15);
    border-color: var(--accent);
    color: var(--accent);
}

.ddx-category {
    margin-bottom: 16px;
}

.ddx-category-title {
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 8px;
    font-weight: 600;
}

.ddx-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    margin-bottom: 4px;
    cursor: pointer;
    transition: background 0.15s;
    border: 1px solid transparent;
}

.ddx-item:hover {
    background: rgba(255,255,255,0.03);
}

.ddx-item.likely {
    background: var(--green-bg);
    border-color: rgba(76,175,132,0.2);
}

.ddx-item.unlikely {
    opacity: 0.35;
}

.ddx-status {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    border: 2px solid var(--card-border);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    margin-top: 1px;
    transition: all 0.2s;
}

.ddx-item.likely .ddx-status {
    border-color: var(--green);
    background: var(--green);
    color: #fff;
}

.ddx-item.unlikely .ddx-status {
    border-color: var(--red);
    color: var(--red);
}

.ddx-name {
    font-weight: 500;
    font-size: 0.9rem;
}

.ddx-detail {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 2px;
}

.ddx-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: 4px;
}

.ddx-tag {
    font-size: 0.7rem;
    padding: 1px 8px;
    border-radius: 10px;
    background: rgba(255,255,255,0.05);
    color: var(--text-muted);
}

/* DDx reason tags */
.ddx-reasons {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: 4px;
}

.ddx-reason {
    font-size: 0.7rem;
    padding: 1px 8px;
    border-radius: 10px;
    font-weight: 500;
}

.reason-for {
    background: var(--green-bg);
    color: var(--green);
}

.reason-against {
    background: var(--red-bg);
    color: var(--red);
}

/* Share buttons */
.share-row {
    display: flex;
    gap: 8px;
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--card-border);
}

.btn-share {
    padding: 8px 16px;
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.82rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-share:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* Toast notification */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 10px 24px;
    background: var(--green);
    color: #fff;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Compensation section */
#compensation-section {
    margin-top: 16px;
}

/* References */
.references {
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--card-border);
}

.references h4 {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.references ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.references a {
    font-size: 0.8rem;
    color: var(--accent);
    text-decoration: none;
    padding: 4px 10px;
    border: 1px solid rgba(108,140,255,0.2);
    border-radius: 6px;
    transition: all 0.15s;
}

.references a:hover {
    background: rgba(108,140,255,0.1);
    border-color: var(--accent);
}

/* Footer */
footer {
    margin-top: 32px;
    padding: 20px;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
    border-top: 1px solid var(--card-border);
}

footer p {
    margin-bottom: 6px;
}

footer a {
    color: var(--accent);
    text-decoration: none;
}

/* Footer action buttons */
.footer-actions {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 18px;
}

.footer-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 20px;
    border-radius: 20px;
    font-size: 0.82rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.25s ease;
    user-select: none;
}

.footer-btn-icon {
    font-size: 0.95rem;
}

.feedback-btn {
    background: rgba(108, 140, 255, 0.1);
    border: 1px solid rgba(108, 140, 255, 0.3);
    color: var(--accent);
}

.feedback-btn:hover {
    background: rgba(108, 140, 255, 0.2);
    border-color: var(--accent);
    transform: translateY(-1px);
}

.bug-btn {
    background: rgba(232, 164, 76, 0.1);
    border: 1px solid rgba(232, 164, 76, 0.3);
    color: var(--orange);
}

.bug-btn:hover {
    background: rgba(232, 164, 76, 0.2);
    border-color: var(--orange);
    transform: translateY(-1px);
}

/* Privacy notice */
.privacy-notice {
    font-size: 0.78rem;
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 14px;
    padding: 8px 12px;
    background: rgba(232,164,76,0.06);
    border: 1px solid rgba(232,164,76,0.15);
    border-radius: var(--radius-sm);
    line-height: 1.5;
}

.privacy-notice strong {
    color: var(--orange);
}

/* Community Cases button */
.btn-community {
    margin-top: 10px;
    padding: 8px 22px;
    border: 1px solid rgba(160,108,232,0.4);
    border-radius: 20px;
    background: rgba(160,108,232,0.1);
    color: var(--purple);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s ease;
}

.btn-community:hover {
    background: rgba(160,108,232,0.2);
    border-color: var(--purple);
    transform: translateY(-1px);
}

/* Modal overlay */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(0,0,0,0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    overflow-y: auto;
}

.modal-content {
    background: var(--card);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    width: 100%;
    max-width: 720px;
    max-height: 85vh;
    overflow-y: auto;
    padding: 28px;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.modal-header h2 {
    font-size: 1.3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--purple), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.6rem;
    cursor: pointer;
    padding: 0 4px;
    line-height: 1;
    transition: color 0.15s;
}

.modal-close:hover {
    color: var(--text);
}

.modal-desc {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-bottom: 18px;
    line-height: 1.5;
}

/* Community list */
.community-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.community-loading {
    text-align: center;
    color: var(--text-muted);
    padding: 30px 0;
}

.community-case {
    padding: 14px 16px;
    background: var(--bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: border-color 0.15s;
}

.community-case:hover {
    border-color: var(--accent);
}

.community-case-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 6px;
}

.community-case-type {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 2px 8px;
    border-radius: 4px;
    background: rgba(108,140,255,0.12);
    color: var(--accent);
}

.community-case-date {
    font-size: 0.72rem;
    color: var(--text-muted);
}

.community-case-disorder {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}

.community-case-values {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 8px;
}

.community-val {
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 4px;
    background: rgba(108,140,255,0.08);
    color: var(--text-muted);
}

.community-val strong {
    color: var(--text);
}

.community-ddx {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: 4px;
}

.community-ddx-tag {
    font-size: 0.7rem;
    padding: 1px 7px;
    border-radius: 4px;
}

.community-ddx-tag.likely {
    background: var(--green-bg);
    color: var(--green);
}

.community-ddx-tag.unlikely {
    background: var(--red-bg);
    color: var(--red);
    opacity: 0.6;
}

.community-empty {
    text-align: center;
    color: var(--text-muted);
    padding: 40px 0;
}

/* Feedback form */
.fb-lang-toggle {
    display: flex;
    gap: 4px;
    margin-left: auto;
    margin-right: 12px;
}

.fb-lang {
    padding: 3px 10px;
    border: 1px solid var(--card-border);
    border-radius: 4px;
    background: transparent;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
}

.fb-lang.active {
    background: rgba(108,140,255,0.15);
    border-color: var(--accent);
    color: var(--accent);
}

.fb-label {
    display: block;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text);
    margin: 14px 0 6px;
}

.fb-required {
    color: var(--red);
}

.fb-optional {
    color: var(--text-muted);
    font-weight: 400;
    font-size: 0.78rem;
}

.fb-select,
.fb-textarea,
.fb-input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
    background: var(--bg);
    color: var(--text);
    font-family: inherit;
    font-size: 0.88rem;
    transition: border-color 0.15s;
}

.fb-select:focus,
.fb-textarea:focus,
.fb-input:focus {
    outline: none;
    border-color: var(--accent);
}

.fb-textarea {
    resize: vertical;
    min-height: 100px;
    line-height: 1.5;
}

.fb-submit {
    width: 100%;
    margin-top: 18px;
    padding: 11px;
    font-size: 0.92rem;
}

.fb-submit:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Utilities */
.hidden {
    display: none !important;
}

/* Responsive */
@media (max-width: 600px) {
    #app {
        padding: 12px 10px 30px;
    }
    header h1 {
        font-size: 1.4rem;
    }
    .card {
        padding: 18px 14px;
    }
    .input-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }
    .calc-grid {
        grid-template-columns: 1fr 1fr;
    }
    .toggle-group {
        flex-direction: row;
    }
    .references ul {
        flex-direction: column;
    }
}

@media (max-width: 380px) {
    .input-grid {
        grid-template-columns: 1fr;
    }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg);
}
::-webkit-scrollbar-thumb {
    background: var(--card-border);
    border-radius: 3px;
}

/* Narrow DDx section extras */
.narrow-section {
    margin-top: 20px;
    padding: 16px;
    background: var(--bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
}

.narrow-section h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--accent);
}

.narrow-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 10px;
}

.narrow-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.narrow-item label {
    font-size: 0.85rem;
    cursor: pointer;
    user-select: none;
}

.narrow-item input[type="checkbox"] {
    accent-color: var(--accent);
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.narrow-item select {
    padding: 4px 8px;
    border: 1px solid var(--card-border);
    border-radius: 6px;
    background: var(--card);
    color: var(--text);
    font-family: inherit;
    font-size: 0.82rem;
}

/* Osmolar gap input */
.inline-input-group {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
}

.inline-input-group label {
    font-size: 0.85rem;
    white-space: nowrap;
}

.inline-input-group input {
    width: 80px;
    padding: 6px 8px;
    border: 1px solid var(--card-border);
    border-radius: 6px;
    background: var(--bg);
    color: var(--text);
    font-family: inherit;
    font-size: 0.9rem;
}

.inline-input-group input:focus {
    outline: none;
    border-color: var(--accent);
}