/* ========================================
   CSS Custom Properties (Brand Colors)
   ======================================== */
:root {
    /* Primary Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-primary-light: #dbeafe;

    /* Neutral Colors */
    --color-slate-50: #f8fafc;
    --color-slate-100: #f1f5f9;
    --color-slate-200: #e2e8f0;
    --color-slate-400: #94a3b8;
    --color-slate-600: #475569;
    --color-slate-700: #334155;
    --color-slate-900: #0f172a;

    /* Semantic Colors */
    --color-success: #10b981;
    --color-success-light: #d1fae5;
    --color-warning: #f59e0b;
    --color-warning-light: #fef3c7;
    --color-error: #ef4444;
    --color-error-light: #fee2e2;
    --color-info: #8b5cf6;
    --color-info-light: #ede9fe;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Font Sizes */
    --font-size-display: 2.25rem;
    --font-size-h1: 1.875rem;
    --font-size-h2: 1.5rem;
    --font-size-h3: 1.25rem;
    --font-size-body-lg: 1.125rem;
    --font-size-body: 1rem;
    --font-size-body-sm: 0.875rem;
    --font-size-caption: 0.75rem;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Transitions */
    --transition-fast: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
   CSS Reset & Base Styles
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-body);
    line-height: 1.5;
    color: var(--color-slate-700);
    background: var(--color-slate-50);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   Layout
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ========================================
   Header
   ======================================== */
.header {
    background: white;
    border-bottom: 1px solid var(--color-slate-200);
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-2xl);
}

.header__content {
    text-align: center;
}

.header__title {
    font-size: var(--font-size-display);
    font-weight: 700;
    color: var(--color-slate-900);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.header__subtitle {
    font-size: var(--font-size-body-lg);
    color: var(--color-slate-600);
    font-weight: 400;
}

/* ========================================
   Main Content
   ======================================== */
.main {
    min-height: calc(100vh - 400px);
    padding-bottom: var(--spacing-3xl);
}

/* ========================================
   Query Section
   ======================================== */
.query-section {
    margin-bottom: var(--spacing-2xl);
}

.query-card {
    background: white;
    border: 1px solid var(--color-slate-200);
    border-radius: 0.75rem;
    padding: var(--spacing-xl);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    transition: box-shadow var(--transition-fast);
}

.query-card:hover {
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.query-card__title {
    font-size: var(--font-size-h2);
    font-weight: 600;
    color: var(--color-slate-900);
    margin-bottom: var(--spacing-sm);
    line-height: 1.25;
}

.query-card__description {
    color: var(--color-slate-600);
    margin-bottom: var(--spacing-lg);
}

/* ========================================
   Workflow Mode Selector
   ======================================== */
.workflow-selector {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--color-slate-200);
}

.workflow-selector__label {
    font-size: var(--font-size-body-sm);
    font-weight: 600;
    color: var(--color-slate-700);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.workflow-selector__options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.workflow-option {
    position: relative;
    cursor: pointer;
    border: 2px solid var(--color-slate-200);
    border-radius: 0.75rem;
    background: white;
    transition: all var(--transition-fast);
    overflow: hidden;
}

.workflow-option:hover {
    border-color: var(--color-primary-light);
    box-shadow: 0 2px 4px rgba(37, 99, 235, 0.1);
}

.workflow-option--active {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.15);
}

.workflow-option__content {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.workflow-option__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.workflow-option__name {
    font-size: var(--font-size-body);
    font-weight: 600;
    color: var(--color-slate-900);
}

.workflow-option__badge {
    display: inline-flex;
    align-items: center;
    padding: 0.125rem 0.5rem;
    border-radius: 9999px;
    font-size: var(--font-size-caption);
    font-weight: 600;
    white-space: nowrap;
}

.workflow-option__badge--default {
    background: var(--color-slate-200);
    color: var(--color-slate-700);
}

.workflow-option__badge--fast {
    background: var(--color-success-light);
    color: var(--color-success);
}

.workflow-option__description {
    font-size: var(--font-size-body-sm);
    color: var(--color-slate-600);
    line-height: 1.5;
}

.workflow-option__meta {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: var(--font-size-caption);
    color: var(--color-slate-500);
    margin-top: var(--spacing-xs);
}

.workflow-option__icon {
    color: var(--color-slate-400);
    flex-shrink: 0;
}

/* Active state styling */
.workflow-option--active .workflow-option__name {
    color: var(--color-primary);
}

.workflow-option--active .workflow-option__meta {
    color: var(--color-primary-dark);
}

.workflow-option--active .workflow-option__icon {
    color: var(--color-primary);
}

/* ========================================
   Form Elements
   ======================================== */
.query-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-label {
    font-size: var(--font-size-body-sm);
    font-weight: 600;
    color: var(--color-slate-700);
}

.form-input {
    background: white;
    border: 2px solid var(--color-slate-200);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    font-size: var(--font-size-body);
    font-family: var(--font-family);
    color: var(--color-slate-700);
    transition: border-color var(--transition-fast);
    resize: vertical;
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-input::placeholder {
    color: var(--color-slate-400);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-size: var(--font-size-body);
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
    font-family: var(--font-family);
    gap: var(--spacing-sm);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn--primary {
    background: var(--color-primary);
    color: white;
}

.btn--primary:hover:not(:disabled) {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px rgba(37, 99, 235, 0.3);
}

.btn--primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn--secondary {
    background: var(--color-slate-100);
    color: var(--color-slate-700);
    border: 1px solid var(--color-slate-200);
}

.btn--secondary:hover:not(:disabled) {
    background: var(--color-slate-200);
}

.btn__loader {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* ========================================
   Spinner
   ======================================== */
.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ========================================
   Results Section
   ======================================== */
.results-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   Result Card
   ======================================== */
.result-card {
    background: white;
    border: 1px solid var(--color-slate-200);
    border-radius: 0.75rem;
    padding: var(--spacing-xl);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.result-card__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-slate-100);
}

.result-card__title {
    font-size: var(--font-size-h2);
    font-weight: 600;
    color: var(--color-slate-900);
    line-height: 1.25;
}

.result-card__content {
    display: grid;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

/* ========================================
   Result Items
   ======================================== */
.result-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.result-item--full {
    grid-column: 1 / -1;
}

.result-item__label {
    font-size: var(--font-size-body-sm);
    font-weight: 600;
    color: var(--color-slate-600);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.result-item__value {
    font-size: var(--font-size-h3);
    font-weight: 600;
    color: var(--color-slate-900);
}

.result-item__value--code {
    font-family: 'Courier New', Courier, monospace;
    background: var(--color-slate-100);
    padding: 0.5rem 0.75rem;
    border-radius: 0.375rem;
    font-size: var(--font-size-body);
    color: var(--color-primary);
    border: 1px solid var(--color-slate-200);
}

.result-item__text {
    font-size: var(--font-size-body);
    color: var(--color-slate-700);
    line-height: 1.75;
}

/* ========================================
   Badges
   ======================================== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: var(--font-size-body-sm);
    font-weight: 600;
    white-space: nowrap;
}

.badge--high {
    background: var(--color-success-light);
    color: var(--color-success);
}

.badge--medium {
    background: var(--color-warning-light);
    color: var(--color-warning);
}

.badge--low {
    background: var(--color-error-light);
    color: var(--color-error);
}

/* ========================================
   Execution Metadata
   ======================================== */
.execution-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-slate-200);
}

.execution-meta__item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-body-sm);
    color: var(--color-slate-600);
}

.execution-meta__icon {
    color: var(--color-slate-400);
}

/* ========================================
   Workflow Section
   ======================================== */
.workflow-section {
    background: white;
    border: 1px solid var(--color-slate-200);
    border-radius: 0.75rem;
    padding: var(--spacing-xl);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.workflow-section__title {
    font-size: var(--font-size-h2);
    font-weight: 600;
    color: var(--color-slate-900);
    margin-bottom: var(--spacing-lg);
    line-height: 1.25;
}

/* ========================================
   Multiple Results Display
   ======================================== */
.multiple-results {
    background: white;
    border: 1px solid var(--color-slate-200);
    border-radius: 0.75rem;
    padding: var(--spacing-xl);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    animation: fadeIn 0.3s ease-out;
}

.multiple-results__header {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--color-slate-100);
}

.multiple-results__title {
    font-size: var(--font-size-h2);
    font-weight: 600;
    color: var(--color-slate-900);
    line-height: 1.25;
}

.multiple-results__list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* ========================================
   Result Card Mini (for Multiple Results)
   ======================================== */
.result-card-mini {
    background: var(--color-slate-50);
    border: 2px solid var(--color-slate-200);
    border-radius: 0.75rem;
    padding: var(--spacing-lg);
    transition: all var(--transition-fast);
}

.result-card-mini:hover {
    border-color: var(--color-primary-light);
    box-shadow: 0 2px 4px rgba(37, 99, 235, 0.1);
    transform: translateX(4px);
}

.result-card-mini__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--color-slate-200);
}

.result-card-mini__rank {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--color-primary);
    color: white;
    font-size: var(--font-size-body-sm);
    font-weight: 700;
    border-radius: 50%;
}

.result-card-mini__content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* ========================================
   Result Mini Items
   ======================================== */
.result-mini-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.result-mini-item--full {
    grid-column: 1 / -1;
}

.result-mini-item__label {
    font-size: var(--font-size-caption);
    font-weight: 600;
    color: var(--color-slate-600);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.result-mini-item__value {
    font-size: var(--font-size-body);
    font-weight: 600;
    color: var(--color-slate-900);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.result-mini-item__code {
    font-family: 'Courier New', Courier, monospace;
    background: white;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: var(--font-size-body-sm);
    color: var(--color-primary);
    border: 1px solid var(--color-slate-200);
    font-weight: 500;
}

.result-mini-item__text {
    font-size: var(--font-size-body-sm);
    color: var(--color-slate-700);
    line-height: 1.75;
    font-weight: 400;
}

/* ========================================
   Workflow Steps
   ======================================== */
.workflow-steps {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.workflow-step {
    border-left: 3px solid var(--color-slate-200);
    padding-left: var(--spacing-lg);
    position: relative;
}

.workflow-step::before {
    content: '';
    position: absolute;
    left: -7px;
    top: 6px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: white;
    border: 3px solid var(--color-slate-200);
}

.workflow-step--completed {
    border-left-color: var(--color-success);
}

.workflow-step--completed::before {
    border-color: var(--color-success);
    background: var(--color-success);
}

.workflow-step--active {
    border-left-color: var(--color-primary);
}

.workflow-step--active::before {
    border-color: var(--color-primary);
    background: var(--color-primary);
}

.workflow-step__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.workflow-step__title {
    font-size: var(--font-size-body-lg);
    font-weight: 600;
    color: var(--color-slate-900);
}

.workflow-step__meta {
    font-size: var(--font-size-body-sm);
    color: var(--color-slate-600);
}

.workflow-step__content {
    color: var(--color-slate-700);
    font-size: var(--font-size-body-sm);
    line-height: 1.75;
}

.workflow-step__details {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--color-slate-50);
    border-radius: 0.5rem;
    font-size: var(--font-size-body-sm);
}

.workflow-step__list {
    margin: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    list-style: disc;
}

.workflow-step__list-item {
    margin-bottom: var(--spacing-xs);
    color: var(--color-slate-700);
}

/* ========================================
   Error Section
   ======================================== */
.error-section {
    animation: fadeIn 0.3s ease-out;
}

.error-card {
    background: white;
    border: 2px solid var(--color-error);
    border-radius: 0.75rem;
    padding: var(--spacing-xl);
    text-align: center;
}

.error-card__icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.error-card__title {
    font-size: var(--font-size-h2);
    font-weight: 600;
    color: var(--color-error);
    margin-bottom: var(--spacing-sm);
}

.error-card__message {
    color: var(--color-slate-700);
    margin-bottom: var(--spacing-lg);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: white;
    border-top: 1px solid var(--color-slate-200);
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-3xl);
}

.footer__text {
    text-align: center;
    font-size: var(--font-size-body-sm);
    color: var(--color-slate-600);
}

.footer__link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.footer__link:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (min-width: 640px) {
    .result-card__content {
        grid-template-columns: 1fr 1fr;
    }

    .result-card-mini__content {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-md);
    }

    .result-mini-item--full {
        grid-column: 1 / -1;
    }
}

@media (max-width: 640px) {
    .header__title {
        font-size: var(--font-size-h1);
    }

    .header__subtitle {
        font-size: var(--font-size-body);
    }

    .query-card,
    .result-card,
    .workflow-section,
    .multiple-results {
        padding: var(--spacing-lg);
    }

    .execution-meta {
        flex-direction: column;
        align-items: flex-start;
    }

    .workflow-selector__options {
        grid-template-columns: 1fr;
    }

    .workflow-option__content {
        padding: var(--spacing-md);
    }

    .result-card-mini {
        padding: var(--spacing-md);
    }

    .multiple-results__header .execution-meta {
        gap: var(--spacing-sm);
    }
}