:root {
    --roi-primary: #1e293b;
    --roi-secondary: #334155;
    --roi-accent: #2563eb;
    --roi-accent-hover: #1d4ed8;
    --roi-bg: #f8fafc;
    --roi-card-bg: #ffffff;
    --roi-border: #e2e8f0;
    --roi-text: #0f172a;
    --roi-text-muted: #64748b;
    --roi-success: #16a34a;
    --roi-warning: #f59e0b;
    --roi-danger: #dc2626;
    --roi-radius: 8px;
    --roi-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --roi-shadow-lg: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

#uk-roi-calculator-app {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    color: var(--roi-text);
    background: var(--roi-bg);
    padding: 40px;
    border-radius: 12px;
    max-width: 1200px;
    margin: 0 auto;
    box-sizing: border-box;
    line-height: 1.5;
}

#uk-roi-calculator-app * {
    box-sizing: border-box;
}

/* Header */
#uk-roi-calculator-app .uk-roi-header-section {
    text-align: center;
    margin-bottom: 30px;
}

#uk-roi-calculator-app .uk-roi-header-section h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--roi-primary);
    margin: 0 0 8px 0;
}

#uk-roi-calculator-app .uk-roi-header-section p {
    color: var(--roi-text-muted);
    font-size: 16px;
    margin: 0;
}

/* Common Cards */
#uk-roi-calculator-app .uk-roi-card,
#uk-roi-calculator-app .uk-roi-section-card,
#uk-roi-calculator-app .uk-roi-results-card,
#uk-roi-calculator-app .uk-roi-prop-card {
    background: var(--roi-card-bg);
    border: 1px solid var(--roi-border);
    border-radius: var(--roi-radius);
    padding: 24px;
    box-shadow: var(--roi-shadow);
    margin-bottom: 24px;
}

/* Search Card */
#uk-roi-calculator-app .uk-roi-search-card {
    border-left: 4px solid var(--roi-accent);
}

#uk-roi-calculator-app .uk-roi-search-card label {
    display: block;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--roi-secondary);
}

#uk-roi-calculator-app .uk-roi-search-group {
    display: flex;
    gap: 12px;
}

#uk-roi-calculator-app .uk-roi-search-group input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--roi-border);
    border-radius: var(--roi-radius);
    font-size: 16px;
    transition: all 0.2s;
}

#uk-roi-calculator-app .uk-roi-search-group input:focus {
    border-color: var(--roi-accent);
    outline: none;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

#uk-roi-calculator-app .uk-roi-search-group button {
    background: var(--roi-accent);
    color: white;
    border: none;
    padding: 0 32px;
    border-radius: var(--roi-radius);
    font-weight: 600;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
}

#uk-roi-calculator-app .uk-roi-search-group button:hover {
    background: var(--roi-accent-hover);
}

#uk-roi-calculator-app .uk-roi-helper-text {
    font-size: 13px;
    color: var(--roi-text-muted);
    margin-top: 8px;
}

/* Messages */
#uk-roi-calculator-app .uk-roi-message {
    margin-top: 15px;
    padding: 12px;
    border-radius: 6px;
    font-size: 14px;
}
#uk-roi-calculator-app .uk-roi-message.error {
    background: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

/* Layout */
#uk-roi-calculator-app .uk-roi-main-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 24px;
    align-items: start;
}

/* Inputs */
#uk-roi-calculator-app .uk-roi-section-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--roi-border);
    padding-bottom: 16px;
}

#uk-roi-calculator-app .uk-roi-step-badge {
    background: var(--roi-primary);
    color: white;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
}

#uk-roi-calculator-app .uk-roi-section-header h3 {
    margin: 0;
    font-size: 18px;
    color: var(--roi-secondary);
}

#uk-roi-calculator-app .uk-roi-field-row {
    display: flex;
    gap: 20px;
    margin-bottom: 16px;
}
#uk-roi-calculator-app .uk-roi-field-row:last-child { margin-bottom: 0; }

#uk-roi-calculator-app .uk-roi-field {
    flex: 1;
}
#uk-roi-calculator-app .uk-roi-field.full { flex: 100%; }

#uk-roi-calculator-app .uk-roi-field label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--roi-secondary);
    margin-bottom: 6px;
}

#uk-roi-calculator-app .uk-roi-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

#uk-roi-calculator-app .uk-roi-currency,
#uk-roi-calculator-app .uk-roi-suffix {
    position: absolute;
    color: var(--roi-text-muted);
    font-size: 14px;
    pointer-events: none;
}
#uk-roi-calculator-app .uk-roi-currency { left: 12px; }
#uk-roi-calculator-app .uk-roi-suffix { right: 12px; }

#uk-roi-calculator-app .uk-roi-input-wrap input,
#uk-roi-calculator-app .uk-roi-field select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--roi-border);
    border-radius: 6px;
    font-size: 14px;
    color: var(--roi-text);
    background: #fff;
    transition: border 0.2s;
}

#uk-roi-calculator-app .uk-roi-input-wrap input {
    padding-left: 24px; /* for currency symbol space */
}
#uk-roi-calculator-app .uk-roi-field select {
    appearance: none;
    background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%2364748b%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
    background-repeat: no-repeat;
    background-position: right 12px top 50%;
    background-size: 10px auto;
    padding-right: 30px;
}

#uk-roi-calculator-app .uk-roi-input-wrap input:focus,
#uk-roi-calculator-app .uk-roi-field select:focus {
    border-color: var(--roi-accent);
    outline: none;
}

#uk-roi-calculator-app .uk-roi-input-wrap.readonly input {
    background: #f1f5f9;
    color: var(--roi-text-muted);
    cursor: default;
}

/* Results */
#uk-roi-calculator-app .uk-roi-results-column {
    position: relative;
}

#uk-roi-calculator-app .uk-roi-sticky-wrapper {
    position: sticky;
    top: 20px;
}

#uk-roi-calculator-app .uk-roi-prop-card {
    padding: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

#uk-roi-calculator-app .uk-roi-prop-img-wrap {
    height: 200px;
    background: #e2e8f0;
    overflow: hidden;
}

#uk-roi-calculator-app .uk-roi-prop-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

#uk-roi-calculator-app .uk-roi-prop-details {
    padding: 16px;
}

#uk-roi-calculator-app .uk-roi-prop-details h4 {
    margin: 0 0 4px 0;
    font-size: 16px;
    color: var(--roi-primary);
}
#uk-roi-calculator-app .uk-roi-prop-details p {
    margin: 0;
    font-size: 13px;
    color: var(--roi-text-muted);
}

#uk-roi-calculator-app .uk-roi-results-card {
    background: var(--roi-primary);
    color: #fff;
    border: none;
}

#uk-roi-calculator-app .uk-roi-res-header h3 {
    margin: 0 0 20px 0;
    color: #94a3b8;
    text-transform: uppercase;
    font-size: 12px;
    letter-spacing: 1px;
}

#uk-roi-calculator-app .uk-roi-big-metric {
    text-align: center;
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

#uk-roi-calculator-app .uk-roi-label {
    display: block;
    font-size: 14px;
    opacity: 0.8;
    margin-bottom: 4px;
}

#uk-roi-calculator-app .uk-roi-value {
    display: block;
    font-size: 48px;
    font-weight: 800;
    line-height: 1;
}

#uk-roi-calculator-app .uk-roi-value.highlight {
    color: var(--roi-success);
}

#uk-roi-calculator-app .uk-roi-metrics-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 20px;
}

#uk-roi-calculator-app .uk-roi-metric-item {
    background: rgba(255,255,255,0.05);
    padding: 12px;
    border-radius: 6px;
    text-align: center;
}

#uk-roi-calculator-app .uk-roi-metric-item .label {
    display: block;
    font-size: 11px;
    opacity: 0.7;
    margin-bottom: 4px;
}
#uk-roi-calculator-app .uk-roi-metric-item .value {
    display: block;
    font-size: 18px;
    font-weight: 600;
}

#uk-roi-calculator-app .uk-roi-metric-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
    font-size: 14px;
    opacity: 0.9;
}

#uk-roi-calculator-app .uk-roi-divider {
    height: 1px;
    background: rgba(255,255,255,0.1);
    margin: 20px 0;
}

#uk-roi-calculator-app .uk-roi-breakdown-list .uk-roi-bd-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 13px;
    color: #94a3b8;
}

/* Spinner */
#uk-roi-calculator-app .uk-roi-spinner {
    display: none;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: uk-roi-spin 0.8s linear infinite;
}

#uk-roi-calculator-app .uk-roi-search-group button:disabled {
    opacity: 0.7;
    cursor: wait;
}

@keyframes uk-roi-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 850px) {
    #uk-roi-calculator-app .uk-roi-main-grid {
        grid-template-columns: 1fr;
    }
    #uk-roi-calculator-app {
        padding: 20px;
    }
}

@media (max-width: 600px) {
    #uk-roi-calculator-app .uk-roi-search-group {
        flex-direction: column;
    }
    #uk-roi-calculator-app .uk-roi-field-row {
        flex-direction: column;
        gap: 12px;
    }
}