/* ============================================
   Web Accessibility Scanner — Design System
   ============================================ */

/* --- CSS Variables / Design Tokens --- */
:root {
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Light mode */
    --bg-primary: #F8F9FC;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #F0F2F8;
    --text-primary: #1A1D2E;
    --text-secondary: #5A5F7A;
    --text-tertiary: #8A8FA8;
    --border-color: rgba(26, 29, 46, 0.08);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.4);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.1);

    /* Accent colors */
    --accent-primary: #6C63FF;
    --accent-primary-rgb: 108, 99, 255;
    --accent-hover: #5A51E6;
    --accent-glow: rgba(108, 99, 255, 0.25);
    --gradient-primary: linear-gradient(135deg, #6C63FF 0%, #A855F7 50%, #EC4899 100%);
    --gradient-subtle: linear-gradient(135deg, rgba(108, 99, 255, 0.08), rgba(168, 85, 247, 0.08));

    /* Severity colors */
    --critical-color: #EF4444;
    --critical-bg: rgba(239, 68, 68, 0.1);
    --serious-color: #F59E0B;
    --serious-bg: rgba(245, 158, 11, 0.1);
    --moderate-color: #3B82F6;
    --moderate-bg: rgba(59, 130, 246, 0.1);
    --minor-color: #22C55E;
    --minor-bg: rgba(34, 197, 94, 0.1);

    /* Score ring */
    --score-good: #22C55E;
    --score-ok: #F59E0B;
    --score-bad: #EF4444;

    /* Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark mode */
[data-theme="dark"] {
    --bg-primary: #0B0D1A;
    --bg-secondary: #12152A;
    --bg-tertiary: #1A1D3A;
    --text-primary: #E8EAF6;
    --text-secondary: #9DA3C4;
    --text-tertiary: #6B71A0;
    --border-color: rgba(255, 255, 255, 0.06);
    --glass-bg: rgba(18, 21, 42, 0.75);
    --glass-border: rgba(255, 255, 255, 0.08);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.4);
    --gradient-subtle: linear-gradient(135deg, rgba(108, 99, 255, 0.12), rgba(168, 85, 247, 0.08));
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: background var(--transition-base), color var(--transition-base);
}

/* --- Utility Classes --- */
.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 20px;
}

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

.icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

/* --- Header --- */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    font-size: 24px;
}

.logo-text {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.header-actions {
    display: flex;
    gap: 4px;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-family);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

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

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 28px var(--accent-glow);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover {
    background: var(--gradient-subtle);
    color: var(--text-primary);
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1rem;
    border-radius: var(--radius-md);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8rem;
}

/* Theme toggle icons */
[data-theme="dark"] .sun-icon {
    display: block;
}

[data-theme="dark"] .moon-icon {
    display: none;
}

[data-theme="light"] .sun-icon,
:root:not([data-theme]) .sun-icon {
    display: none;
}

[data-theme="light"] .moon-icon,
:root:not([data-theme]) .moon-icon {
    display: block;
}

/* --- Hero --- */
.hero {
    text-align: center;
    padding: 56px 0 32px;
}

.hero-title {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.2;
    margin-bottom: 12px;
}

.hero-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.7;
}

/* --- Input Tabs --- */
.input-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 12px;
    background: var(--bg-tertiary);
    padding: 4px;
    border-radius: var(--radius-sm);
    width: fit-content;
}

.tab {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-family);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tab:hover {
    color: var(--text-primary);
}

.tab.active {
    background: var(--bg-secondary);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

.tab .icon {
    width: 15px;
    height: 15px;
}

/* --- Code Input --- */
.input-wrapper {
    padding: 4px;
}

.code-input {
    width: 100%;
    min-height: 200px;
    padding: 20px;
    border: none;
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    font-size: 0.85rem;
    line-height: 1.7;
    resize: vertical;
    transition: box-shadow var(--transition-fast);
}

.code-input:focus {
    outline: none;
    box-shadow: inset 0 0 0 2px var(--accent-primary);
}

.code-input::placeholder {
    color: var(--text-tertiary);
}

/* --- URL Input --- */
.url-input-group {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    transition: box-shadow var(--transition-fast);
}

.url-input-group:focus-within {
    box-shadow: inset 0 0 0 2px var(--accent-primary);
}

.url-icon {
    color: var(--text-tertiary);
}

.url-field {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 0.95rem;
    outline: none;
}

.url-field::placeholder {
    color: var(--text-tertiary);
}

.input-help {
    font-size: 0.78rem;
    color: var(--text-tertiary);
    padding: 8px 16px 8px;
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
}

/* --- Scan Actions --- */
.scan-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 16px;
}

/* --- Loading --- */
.loading-section {
    display: flex;
    justify-content: center;
    padding: 60px 0;
}

.loader {
    text-align: center;
}

.loader-ring {
    width: 48px;
    height: 48px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    margin: 0 auto 16px;
    animation: spin 0.8s linear infinite;
}

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

.loader-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* --- Results --- */
.results-section {
    animation: fadeInUp 0.5s var(--transition-base);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.results-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.results-title {
    font-size: 1.25rem;
    font-weight: 700;
}

.results-actions {
    display: flex;
    gap: 4px;
}

/* --- Summary Grid --- */
.summary-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}

.summary-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 20px 12px;
    text-align: center;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.summary-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.summary-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.summary-icon svg {
    width: 22px;
    height: 22px;
}

.summary-icon.critical {
    background: var(--critical-bg);
    color: var(--critical-color);
}

.summary-icon.serious {
    background: var(--serious-bg);
    color: var(--serious-color);
}

.summary-icon.moderate {
    background: var(--moderate-bg);
    color: var(--moderate-color);
}

.summary-icon.minor {
    background: var(--minor-bg);
    color: var(--minor-color);
}

.summary-count {
    font-size: 1.5rem;
    font-weight: 800;
    line-height: 1;
}

.summary-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Score Card */
.score-card {
    justify-content: center;
}

.score-ring {
    position: relative;
    width: 72px;
    height: 72px;
}

.score-ring svg {
    width: 72px;
    height: 72px;
    transform: rotate(-90deg);
}

.score-bg {
    fill: none;
    stroke: var(--border-color);
    stroke-width: 6;
}

.score-fill {
    fill: none;
    stroke: var(--score-good);
    stroke-width: 6;
    stroke-linecap: round;
    stroke-dasharray: 326.73;
    stroke-dashoffset: 326.73;
    transition: stroke-dashoffset 1s cubic-bezier(0.4, 0, 0.2, 1), stroke 0.5s;
}

.score-value {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.15rem;
    font-weight: 800;
}

/* --- Filter Bar --- */
.filter-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 8px 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    gap: 4px;
}

.filter-chip {
    padding: 6px 14px;
    border: none;
    border-radius: 20px;
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-family);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-chip:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

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

.filter-search {
    flex: 0 1 240px;
}

.search-input {
    width: 100%;
    padding: 8px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 0.825rem;
    transition: border-color var(--transition-fast);
}

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

.search-input::placeholder {
    color: var(--text-tertiary);
}

/* --- Issues List --- */
.issue-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 12px;
    transition: all var(--transition-fast);
    animation: fadeInUp 0.3s ease forwards;
}

.issue-card:hover {
    border-color: rgba(var(--accent-primary-rgb), 0.2);
    box-shadow: var(--shadow-sm);
}

.issue-header {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 12px;
}

.severity-badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
    flex-shrink: 0;
}

.severity-badge.critical {
    background: var(--critical-bg);
    color: var(--critical-color);
}

.severity-badge.serious {
    background: var(--serious-bg);
    color: var(--serious-color);
}

.severity-badge.moderate {
    background: var(--moderate-bg);
    color: var(--moderate-color);
}

.severity-badge.minor {
    background: var(--minor-bg);
    color: var(--minor-color);
}

.issue-title {
    font-size: 0.95rem;
    font-weight: 600;
    line-height: 1.4;
}

.issue-body {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.issue-detail {
    display: flex;
    gap: 8px;
    font-size: 0.83rem;
}

.issue-detail-label {
    color: var(--text-tertiary);
    font-weight: 500;
    white-space: nowrap;
    min-width: 70px;
}

.issue-detail-value {
    color: var(--text-secondary);
    line-height: 1.5;
}

.issue-code {
    display: block;
    background: var(--bg-tertiary);
    padding: 8px 12px;
    border-radius: 6px;
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.78rem;
    overflow-x: auto;
    white-space: pre;
    color: var(--text-primary);
}

.issue-wcag-tag {
    display: inline-flex;
    padding: 2px 8px;
    background: var(--gradient-subtle);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--accent-primary);
}

/* --- No Issues --- */
.no-issues {
    text-align: center;
    padding: 48px 20px;
}

.no-issues-icon {
    font-size: 3rem;
    margin-bottom: 12px;
}

.no-issues h4 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.no-issues p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* --- Modal --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
    animation: fadeIn 0.2s ease;
}

.modal-overlay[hidden] {
    display: none;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.modal {
    padding: 28px;
    max-width: 480px;
    width: 90%;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.modal-header h3 {
    font-size: 1.1rem;
    font-weight: 700;
}

.shortcuts-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.shortcut-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.shortcut-item span {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

kbd {
    padding: 3px 8px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: var(--font-family);
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* --- Toast --- */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    font-size: 0.85rem;
    color: var(--text-primary);
    animation: slideInRight 0.3s ease, fadeOut 0.3s ease 2.5s forwards;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(40px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeOut {
    to {
        opacity: 0;
        transform: translateY(8px);
    }
}

.toast-icon {
    font-size: 1rem;
}

/* --- Footer --- */
.footer {
    margin-top: 64px;
    padding: 24px 0;
    border-top: 1px solid var(--border-color);
}

.footer-inner {
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

.footer-links {
    margin-top: 6px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--accent-primary);
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .summary-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .score-card {
        grid-column: span 3;
    }

    .filter-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-search {
        flex: 1;
    }

    .hero {
        padding: 40px 0 24px;
    }

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

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

    .score-card {
        grid-column: span 2;
    }

    .scan-actions {
        flex-wrap: wrap;
    }

    .btn-lg {
        width: 100%;
        justify-content: center;
    }
}