/*
 * Access100 Accessibility Checker - Stylesheet
 * WCAG 2.1 AA compliant: 4.5:1 contrast for normal text, 3:1 for large text
 * Follows patterns from meetings/style.css
 */

:root {
    /* Light Mode Colors */
    --bg-light: #ffffff;
    --text-light: #1a1a1a;
    --text-muted-light: #555555;
    --primary-light: #0056b3;
    --border-light: #d1d5db;
    --card-bg-light: #f3f4f6;

    /* Dark Mode Colors */
    --bg-dark: #0f0f0f;
    --text-dark: #e5e5e5;
    --text-muted-dark: #a3a3a3;
    --primary-dark: #60a5fa;
    --border-dark: #404040;
    --card-bg-dark: #1a1a1a;

    /* Severity colors (light mode) */
    --critical-bg-light: #fef2f2;
    --critical-border-light: #dc2626;
    --critical-text-light: #991b1b;
    --serious-bg-light: #fff7ed;
    --serious-border-light: #ea580c;
    --serious-text-light: #9a3412;
    --moderate-bg-light: #fefce8;
    --moderate-border-light: #ca8a04;
    --moderate-text-light: #854d0e;
    --minor-bg-light: #eff6ff;
    --minor-border-light: #2563eb;
    --minor-text-light: #1e40af;
    --success-light: #166534;
    --success-bg-light: #dcfce7;

    /* Severity colors (dark mode) */
    --critical-bg-dark: #450a0a;
    --critical-border-dark: #ef4444;
    --critical-text-dark: #fca5a5;
    --serious-bg-dark: #431407;
    --serious-border-dark: #f97316;
    --serious-text-dark: #fdba74;
    --moderate-bg-dark: #422006;
    --moderate-border-dark: #eab308;
    --moderate-text-dark: #fde047;
    --minor-bg-dark: #172554;
    --minor-border-dark: #3b82f6;
    --minor-text-dark: #93c5fd;
    --success-dark: #86efac;
    --success-bg-dark: #052e16;
}

/* System preference default */
@media (prefers-color-scheme: light) {
    :root:not([data-theme]) {
        --bg: var(--bg-light); --text: var(--text-light); --text-muted: var(--text-muted-light);
        --primary: var(--primary-light); --border: var(--border-light); --card-bg: var(--card-bg-light);
        --critical-bg: var(--critical-bg-light); --critical-border: var(--critical-border-light); --critical-text: var(--critical-text-light);
        --serious-bg: var(--serious-bg-light); --serious-border: var(--serious-border-light); --serious-text: var(--serious-text-light);
        --moderate-bg: var(--moderate-bg-light); --moderate-border: var(--moderate-border-light); --moderate-text: var(--moderate-text-light);
        --minor-bg: var(--minor-bg-light); --minor-border: var(--minor-border-light); --minor-text: var(--minor-text-light);
        --success: var(--success-light); --success-bg: var(--success-bg-light);
    }
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme]) {
        --bg: var(--bg-dark); --text: var(--text-dark); --text-muted: var(--text-muted-dark);
        --primary: var(--primary-dark); --border: var(--border-dark); --card-bg: var(--card-bg-dark);
        --critical-bg: var(--critical-bg-dark); --critical-border: var(--critical-border-dark); --critical-text: var(--critical-text-dark);
        --serious-bg: var(--serious-bg-dark); --serious-border: var(--serious-border-dark); --serious-text: var(--serious-text-dark);
        --moderate-bg: var(--moderate-bg-dark); --moderate-border: var(--moderate-border-dark); --moderate-text: var(--moderate-text-dark);
        --minor-bg: var(--minor-bg-dark); --minor-border: var(--minor-border-dark); --minor-text: var(--minor-text-dark);
        --success: var(--success-dark); --success-bg: var(--success-bg-dark);
    }
}

[data-theme="light"] {
    --bg: var(--bg-light); --text: var(--text-light); --text-muted: var(--text-muted-light);
    --primary: var(--primary-light); --border: var(--border-light); --card-bg: var(--card-bg-light);
    --critical-bg: var(--critical-bg-light); --critical-border: var(--critical-border-light); --critical-text: var(--critical-text-light);
    --serious-bg: var(--serious-bg-light); --serious-border: var(--serious-border-light); --serious-text: var(--serious-text-light);
    --moderate-bg: var(--moderate-bg-light); --moderate-border: var(--moderate-border-light); --moderate-text: var(--moderate-text-light);
    --minor-bg: var(--minor-bg-light); --minor-border: var(--minor-border-light); --minor-text: var(--minor-text-light);
    --success: var(--success-light); --success-bg: var(--success-bg-light);
}

[data-theme="dark"] {
    --bg: var(--bg-dark); --text: var(--text-dark); --text-muted: var(--text-muted-dark);
    --primary: var(--primary-dark); --border: var(--border-dark); --card-bg: var(--card-bg-dark);
    --critical-bg: var(--critical-bg-dark); --critical-border: var(--critical-border-dark); --critical-text: var(--critical-text-dark);
    --serious-bg: var(--serious-bg-dark); --serious-border: var(--serious-border-dark); --serious-text: var(--serious-text-dark);
    --moderate-bg: var(--moderate-bg-dark); --moderate-border: var(--moderate-border-dark); --moderate-text: var(--moderate-text-dark);
    --minor-bg: var(--minor-bg-dark); --minor-border: var(--minor-border-dark); --minor-text: var(--minor-text-dark);
    --success: var(--success-dark); --success-bg: var(--success-bg-dark);
}

/* ── Base Styles ── */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--bg);
    margin: 0;
    padding: 0;
    transition: background-color 0.2s ease, color 0.2s ease;
}

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

a:hover {
    text-decoration: underline;
}

a:focus {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ── Skip Link ── */

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary);
    color: #fff;
    padding: 8px 16px;
    z-index: 100;
    font-weight: 500;
}

.skip-link:focus {
    top: 0;
    outline: 3px solid var(--primary);
}

/* ── Header ── */

header {
    border-bottom: 1px solid var(--border);
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

header h1 {
    font-size: 1.75rem;
    font-weight: 600;
    margin: 0;
}

header h1 a {
    text-decoration: none;
    color: inherit;
}

header h1 span {
    color: var(--primary);
}

/* ── Theme Toggle ── */

.theme-toggle {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.theme-toggle button {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.4rem 0.6rem;
    cursor: pointer;
    color: var(--text);
    font-size: 1rem;
    transition: all 0.15s ease;
    display: flex;
    align-items: center;
}

.theme-toggle button:hover {
    background: var(--border);
}

.theme-toggle button.active {
    background-color: var(--primary);
    color: white;
    border-color: var(--primary);
}

.theme-toggle button:focus {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
}

/* ── Hero / Form Section ── */

.hero {
    text-align: center;
    padding: 2rem 0 3rem;
}

.hero h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 2rem;
}

.audit-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    display: flex;
    gap: 0.5rem;
}

.url-input {
    flex: 1;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
    color: var(--text);
    transition: border-color 0.15s ease;
}

.url-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.url-input::placeholder {
    color: var(--text-muted);
}

.submit-btn {
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    background-color: var(--primary);
    color: #fff;
    cursor: pointer;
    white-space: nowrap;
    transition: opacity 0.15s ease;
}

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

.submit-btn:focus {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
}

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

.form-hint {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    text-align: left;
}

.form-error {
    margin-top: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    background: var(--critical-bg);
    border: 1px solid var(--critical-border);
    color: var(--critical-text);
    font-size: 0.95rem;
    text-align: left;
}

/* ── Spinner ── */

.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    vertical-align: middle;
    margin-right: 0.5rem;
}

.spinner-large {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 1rem;
}

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

@media (prefers-reduced-motion: reduce) {
    .spinner, .spinner-large {
        animation: none;
        border-top-color: var(--primary);
        opacity: 0.7;
    }
}

/* ── Status Region (loading) ── */

.status-region {
    padding: 3rem 0;
    text-align: center;
}

.status-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 2rem;
    max-width: 500px;
    margin: 0 auto;
}

.status-message {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.status-detail {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin: 0;
}

/* ── How It Works ── */

.how-it-works {
    padding: 2rem 0;
    border-top: 1px solid var(--border);
}

.how-it-works h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.step {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

.step h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin: 0 0 0.5rem;
}

.step p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin: 0;
}

/* ── About Section ── */

.about-section {
    padding: 2rem 0;
    border-top: 1px solid var(--border);
}

.about-section h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.about-section p {
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

/* ── Results Page: Report Header ── */

.report-header {
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 1.5rem;
}

.report-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0 0 0.5rem;
}

.report-meta {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.report-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.btn-primary {
    display: inline-block;
    padding: 0.6rem 1.25rem;
    border-radius: 6px;
    background-color: var(--primary);
    color: #fff;
    font-weight: 500;
    text-decoration: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary:hover { opacity: 0.9; text-decoration: none; }
.btn-primary:focus { outline: 3px solid var(--primary); outline-offset: 2px; }

.btn-secondary {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    color: var(--text);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    font-size: 0.9rem;
}

.btn-secondary:hover { background: var(--border); text-decoration: none; }
.btn-secondary:focus { outline: 3px solid var(--primary); outline-offset: 2px; }

/* ── Summary Dashboard ── */

.summary-dashboard {
    margin-bottom: 2rem;
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.summary-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.summary-number {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1;
}

.summary-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

.summary-icon {
    font-weight: 700;
    font-size: 0.85rem;
}

.summary-total { border-left: 3px solid var(--text); }
.summary-critical { border-left: 3px solid var(--critical-border); }
.summary-critical .summary-number { color: var(--critical-text); }
.summary-serious { border-left: 3px solid var(--serious-border); }
.summary-serious .summary-number { color: var(--serious-text); }
.summary-moderate { border-left: 3px solid var(--moderate-border); }
.summary-moderate .summary-number { color: var(--moderate-text); }
.summary-minor { border-left: 3px solid var(--minor-border); }
.summary-minor .summary-number { color: var(--minor-text); }
.summary-passes { border-left: 3px solid var(--success); }
.summary-passes .summary-number { color: var(--success); }

.success-banner {
    background: var(--success-bg);
    border: 2px solid var(--success);
    border-radius: 8px;
    padding: 1.25rem;
    color: var(--success);
    line-height: 1.6;
}

/* ── Error Page ── */

.error-page {
    text-align: center;
    padding: 3rem 0;
}

.error-page h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.error-page p {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.error-detail {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    font-family: monospace;
    font-size: 0.9rem;
    text-align: left;
    max-width: 500px;
    margin: 0 auto 1.5rem;
}

/* ── Filter Bar ── */

.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.filter-btn {
    padding: 0.4rem 0.85rem;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.15s ease;
}

.filter-btn:hover { background: var(--card-bg); }
.filter-btn:focus { outline: 3px solid var(--primary); outline-offset: 2px; }

.filter-btn.active {
    background-color: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.filter-count {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 0 0.4rem;
    border-radius: 4px;
    font-size: 0.8rem;
    margin-left: 0.25rem;
}

.filter-btn:not(.active) .filter-count {
    background: var(--card-bg);
}

.filter-critical { border-color: var(--critical-border); color: var(--critical-text); }
.filter-serious { border-color: var(--serious-border); color: var(--serious-text); }
.filter-moderate { border-color: var(--moderate-border); color: var(--moderate-text); }
.filter-minor { border-color: var(--minor-border); color: var(--minor-text); }

.filter-critical.active { background: var(--critical-border); color: #fff; }
.filter-serious.active { background: var(--serious-border); color: #fff; }
.filter-moderate.active { background: var(--moderate-border); color: #fff; }
.filter-minor.active { background: var(--minor-border); color: #fff; }

/* ── Violations Section ── */

.violations-section h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

/* ── Violation Cards ── */

.violation-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem;
    margin-bottom: 1rem;
}

.violation-card[data-impact="critical"] { border-left: 4px solid var(--critical-border); }
.violation-card[data-impact="serious"] { border-left: 4px solid var(--serious-border); }
.violation-card[data-impact="moderate"] { border-left: 4px solid var(--moderate-border); }
.violation-card[data-impact="minor"] { border-left: 4px solid var(--minor-border); }

.violation-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
}

.impact-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    white-space: nowrap;
}

.impact-critical { background: var(--critical-bg); color: var(--critical-text); border: 1px solid var(--critical-border); }
.impact-serious { background: var(--serious-bg); color: var(--serious-text); border: 1px solid var(--serious-border); }
.impact-moderate { background: var(--moderate-bg); color: var(--moderate-text); border: 1px solid var(--moderate-border); }
.impact-minor { background: var(--minor-bg); color: var(--minor-text); border: 1px solid var(--minor-border); }

.violation-title {
    font-size: 1.05rem;
    font-weight: 600;
    margin: 0;
    flex: 1;
}

.violation-desc {
    color: var(--text-muted);
    margin: 0 0 0.5rem;
    font-size: 0.95rem;
}

.violation-wcag {
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 500;
    margin: 0 0 0.5rem;
}

.violation-elements {
    font-size: 0.9rem;
    margin: 0 0 0.5rem;
    color: var(--text-muted);
}

.violation-learn {
    margin: 0 0 0.75rem;
    font-size: 0.9rem;
}

.violation-learn a {
    font-weight: 500;
}

/* ── Expandable Nodes ── */

.violation-nodes {
    border-top: 1px solid var(--border);
    padding-top: 0.75rem;
    margin-top: 0.75rem;
}

.violation-nodes summary {
    cursor: pointer;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--primary);
    padding: 0.25rem 0;
}

.violation-nodes summary:hover {
    text-decoration: underline;
}

.violation-nodes summary:focus {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
}

.nodes-list {
    margin-top: 0.75rem;
}

.node-item {
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg);
}

.node-html {
    display: block;
    font-size: 0.8rem;
    background: var(--card-bg);
    padding: 0.5rem;
    border-radius: 4px;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-all;
    margin-bottom: 0.5rem;
}

.node-selector {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin: 0.25rem 0;
}

.node-selector code {
    font-size: 0.75rem;
    background: var(--card-bg);
    padding: 0.15rem 0.35rem;
    border-radius: 3px;
}

.node-fix {
    font-size: 0.85rem;
    margin: 0.5rem 0 0;
}

.node-fix ul {
    margin: 0.25rem 0 0 1.5rem;
    padding: 0;
}

.node-fix li {
    margin-bottom: 0.15rem;
}

.nodes-more {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-style: italic;
}

/* ── Footer ── */

footer {
    text-align: center;
    padding: 2rem 0;
    margin-top: 2rem;
    font-size: 0.9rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
}

footer a {
    color: var(--primary);
}

footer p {
    margin: 0 0 0.25rem;
}

/* ── Responsive ── */

@media (max-width: 640px) {
    .container {
        padding: 1rem;
    }

    header {
        flex-direction: column;
        align-items: flex-start;
    }

    header h1 {
        font-size: 1.5rem;
    }

    .hero h2 {
        font-size: 1.5rem;
    }

    .form-group {
        flex-direction: column;
    }

    .submit-btn {
        width: 100%;
    }

    .steps-grid {
        grid-template-columns: 1fr;
    }

    .summary-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .report-actions {
        flex-direction: column;
    }

    .violation-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}

@media (max-width: 480px) {
    .summary-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}