/* ==========================================================================
   SEO Audit Tool — Premium Dark Design System (ImgKit Family)
   ========================================================================== */

:root {
    --bg: #030303;
    --surface: #0b0b0d;
    --surface-2: #111114;
    --border: #1d1d21;
    --border-active: #32323b;
    --text: #f5f5f7;
    --text-muted: #6e6e73;
    --accent-seo: #00c781;
    --accent-seo-dim: rgba(0, 199, 129, 0.12);
    --success: #30d158;
    --error: #ff453a;
    --warning: #ff9f0a;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --transition-fast: 0.15s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-normal: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
    scroll-behavior: smooth;
    background-color: var(--bg);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg);
    background-image: radial-gradient(circle, rgba(255,255,255,0.04) 1px, transparent 1px);
    background-size: 24px 24px;
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
}

/* ===== Header ===== */
.header {
    padding: 20px 40px;
    border-bottom: 1px solid var(--border);
    background: rgba(3,3,3,0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text);
    font-size: 20px;
    font-weight: 700;
}

.header-brand i {
    color: var(--accent-seo);
    font-size: 18px;
}

.header-badge {
    font-size: 10px;
    font-weight: 700;
    background: var(--accent-seo);
    color: #000;
    padding: 2px 8px;
    border-radius: 4px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.header-tagline {
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 400;
}

/* ===== Main Container ===== */
.main-container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 24px 80px;
}

/* ===== Hero Section ===== */
.hero-section {
    text-align: center;
    padding: 80px 0 40px;
}

.hero-title {
    font-size: 42px;
    font-weight: 800;
    letter-spacing: -1.5px;
    line-height: 1.15;
    margin-bottom: 16px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent-seo), #34d399, #06b6d4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    color: var(--text-muted);
    font-size: 16px;
    max-width: 560px;
    margin: 0 auto 40px;
    line-height: 1.6;
}

/* ===== URL Input Bar ===== */
.url-input-wrapper {
    max-width: 640px;
    margin: 0 auto;
}

.url-input-bar {
    display: flex;
    align-items: center;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 6px 6px 6px 20px;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.url-input-bar:focus-within {
    border-color: var(--accent-seo);
    box-shadow: 0 0 0 3px var(--accent-seo-dim);
}

.url-icon {
    color: var(--text-muted);
    font-size: 16px;
    flex-shrink: 0;
}

.url-input-bar input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text);
    font-size: 15px;
    font-family: inherit;
    padding: 12px 16px;
    min-width: 0;
}

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

.audit-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    background: var(--accent-seo);
    color: #000;
    border: none;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    flex-shrink: 0;
}

.audit-btn:hover {
    filter: brightness(1.15);
    transform: translateY(-1px);
}

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

.audit-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.url-hint {
    color: var(--text-muted);
    font-size: 12px;
    margin-top: 10px;
    text-align: left;
    padding-left: 4px;
}

/* ===== Loading Section ===== */
.loading-section {
    text-align: center;
    padding: 60px 0;
}

.loading-spinner {
    position: relative;
    width: 64px;
    height: 64px;
    margin: 0 auto 24px;
}

.spinner-ring {
    position: absolute;
    inset: 0;
    border: 2px solid transparent;
    border-top-color: var(--accent-seo);
    border-radius: 50%;
    animation: spin 1.2s linear infinite;
}

.spinner-ring:nth-child(2) {
    inset: 6px;
    border-top-color: #34d399;
    animation-duration: 1.6s;
    animation-direction: reverse;
}

.spinner-ring:nth-child(3) {
    inset: 12px;
    border-top-color: #06b6d4;
    animation-duration: 2s;
}

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

.loading-text {
    color: var(--text);
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 24px;
}

.loading-steps {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}

.step {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 12px;
    color: var(--text-muted);
    transition: all var(--transition-normal);
}

.step.active {
    color: var(--accent-seo);
    border-color: var(--accent-seo);
    background: var(--accent-seo-dim);
}

.step.done {
    color: var(--success);
    border-color: rgba(48, 209, 88, 0.3);
}

/* ===== Score Card ===== */
.score-card {
    display: flex;
    align-items: center;
    gap: 40px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 40px;
    margin-bottom: 24px;
}

.score-gauge-wrapper {
    position: relative;
    width: 140px;
    height: 140px;
    flex-shrink: 0;
}

.score-gauge {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.gauge-bg {
    fill: none;
    stroke: var(--border);
    stroke-width: 8;
}

.gauge-fill {
    fill: none;
    stroke: var(--accent-seo);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 326.73;
    stroke-dashoffset: 326.73;
    transition: stroke-dashoffset 1.5s cubic-bezier(0.16, 1, 0.3, 1), stroke 0.5s ease;
}

.score-number {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 42px;
    font-weight: 800;
    letter-spacing: -2px;
}

.score-meta h2 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 6px;
}

.audited-url {
    color: var(--text-muted);
    font-size: 13px;
    word-break: break-all;
    margin-bottom: 16px;
}

.score-summary {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.summary-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 500;
}

.summary-item.pass { color: var(--success); }
.summary-item.warn { color: var(--warning); }
.summary-item.fail { color: var(--error); }

/* ===== Quick Stats ===== */
.quick-stats {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 12px;
    margin-bottom: 32px;
}

.qs-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px;
    text-align: center;
}

.qs-label {
    display: block;
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}

.qs-value {
    display: block;
    font-size: 16px;
    font-weight: 700;
}

/* ===== Audit Categories ===== */
.audit-categories {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.category-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.category-card:hover {
    border-color: var(--border-active);
}

.category-header {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 20px 24px;
    cursor: pointer;
    user-select: none;
    transition: background var(--transition-fast);
}

.category-header:hover {
    background: rgba(255,255,255,0.02);
}

.category-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
}

.category-icon.pass { background: rgba(48,209,88,0.12); color: var(--success); }
.category-icon.warn { background: rgba(255,159,10,0.12); color: var(--warning); }
.category-icon.fail { background: rgba(255,69,58,0.12); color: var(--error); }

.category-info {
    flex: 1;
    min-width: 0;
}

.category-name {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 2px;
}

.category-desc {
    font-size: 12px;
    color: var(--text-muted);
}

.category-score {
    font-size: 20px;
    font-weight: 800;
    flex-shrink: 0;
    min-width: 44px;
    text-align: right;
}

.category-score.pass { color: var(--success); }
.category-score.warn { color: var(--warning); }
.category-score.fail { color: var(--error); }

.category-chevron {
    color: var(--text-muted);
    font-size: 12px;
    transition: transform var(--transition-fast);
    flex-shrink: 0;
}

.category-card.open .category-chevron {
    transform: rotate(180deg);
}

.category-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.category-card.open .category-body {
    max-height: 2000px;
}

.category-issues {
    padding: 0 24px 20px;
    border-top: 1px solid var(--border);
}

.issue-row {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 0;
    border-bottom: 1px solid rgba(255,255,255,0.04);
}

.issue-row:last-child {
    border-bottom: none;
}

.issue-icon {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    flex-shrink: 0;
    margin-top: 2px;
}

.issue-icon.pass { background: rgba(48,209,88,0.15); color: var(--success); }
.issue-icon.warn { background: rgba(255,159,10,0.15); color: var(--warning); }
.issue-icon.fail { background: rgba(255,69,58,0.15); color: var(--error); }
.issue-icon.info { background: rgba(0,199,129,0.15); color: var(--accent-seo); }

.issue-content {
    flex: 1;
    min-width: 0;
}

.issue-title {
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 3px;
}

.issue-detail {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.5;
    word-break: break-word;
}

.issue-detail code {
    background: rgba(255,255,255,0.06);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 11px;
    font-family: 'SF Mono', 'Fira Code', monospace;
    color: var(--accent-seo);
}

/* ===== Footer ===== */
.footer {
    text-align: center;
    padding: 32px 24px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 13px;
}

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

.footer a:hover {
    text-decoration: underline;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .header {
        padding: 16px 20px;
    }

    .hero-title {
        font-size: 28px;
    }

    .hero-subtitle {
        font-size: 14px;
    }

    .url-input-bar {
        flex-direction: column;
        padding: 12px;
        gap: 8px;
    }

    .url-icon { display: none; }

    .url-input-bar input {
        width: 100%;
        padding: 10px 4px;
    }

    .audit-btn {
        width: 100%;
        justify-content: center;
        padding: 14px;
    }

    .score-card {
        flex-direction: column;
        text-align: center;
        padding: 32px 24px;
        gap: 24px;
    }

    .score-summary {
        justify-content: center;
    }

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

    .category-header {
        padding: 16px;
    }
}

@media (max-width: 480px) {
    .hero-section {
        padding: 48px 0 24px;
    }

    .hero-title {
        font-size: 24px;
    }

    .quick-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .score-gauge-wrapper {
        width: 110px;
        height: 110px;
    }

    .score-number {
        font-size: 34px;
    }

    .loading-steps {
        flex-direction: column;
        align-items: center;
    }
}

/* ===== PDF Button & Print Layout ===== */
.print-header {
    display: none;
}

.score-actions {
    margin-top: 18px;
}

.pdf-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 10px 18px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.pdf-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--border-active);
}

.pdf-btn i {
    color: var(--error);
}

@media print {
    @page {
        size: A4;
        margin: 15mm;
    }
    
    body {
        background: #ffffff !important;
        color: #000000 !important;
        font-size: 12px;
    }
    
    .print-header {
        display: flex !important;
        align-items: center;
        justify-content: space-between;
        padding-bottom: 12px;
        border-bottom: 2px solid #000000;
        margin-bottom: 24px;
    }
    
    .print-brand {
        display: flex;
        align-items: center;
        gap: 8px;
        font-size: 18px;
        font-weight: 700;
        color: #000000;
    }
    
    .print-brand i {
        color: #00c781 !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
    
    .print-meta-info {
        font-size: 11px;
        color: #555555;
    }
    
    /* Hide Screen-only items */
    .header,
    .hero-section,
    .loading-section,
    .score-actions,
    .footer,
    .category-chevron {
        display: none !important;
    }
    
    .main-container {
        padding: 0 !important;
        max-width: 100% !important;
    }
    
    /* Make Score Card Printer-Friendly */
    .score-card {
        background: #f8f9fa !important;
        border: 1px solid #e9ecef !important;
        color: #000000 !important;
        padding: 24px !important;
        box-shadow: none !important;
        border-radius: var(--radius-md) !important;
        margin-bottom: 20px !important;
        page-break-inside: avoid;
    }
    
    .gauge-bg {
        stroke: #e9ecef !important;
    }
    
    .gauge-fill {
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
    
    .score-number {
        color: #000000 !important;
    }
    
    .score-summary .summary-item {
        color: #333333 !important;
    }
    
    /* Quick Stats Print Grid */
    .quick-stats {
        grid-template-columns: repeat(6, 1fr) !important;
        gap: 8px !important;
        margin-bottom: 24px !important;
        page-break-inside: avoid;
    }
    
    .qs-item {
        background: #f8f9fa !important;
        border: 1px solid #e9ecef !important;
        padding: 10px !important;
    }
    
    .qs-label {
        color: #666666 !important;
    }
    
    .qs-value {
        color: #000000 !important;
    }
    
    /* Accordion Auto-Expand & Cards */
    .category-card {
        background: #ffffff !important;
        border: 1px solid #e9ecef !important;
        box-shadow: none !important;
        margin-bottom: 12px !important;
        page-break-inside: avoid;
        border-radius: var(--radius-md) !important;
    }
    
    .category-header {
        background: #f8f9fa !important;
        padding: 12px 16px !important;
        border-bottom: 1px solid #e9ecef !important;
    }
    
    .category-body {
        max-height: none !important;
        display: block !important;
        overflow: visible !important;
        transition: none !important;
        height: auto !important;
    }
    
    .category-issues {
        padding: 12px 16px !important;
        border-top: none !important;
    }
    
    .issue-row {
        padding: 8px 0 !important;
        border-bottom: 1px solid #e9ecef !important;
    }
    
    .issue-title {
        color: #000000 !important;
    }
    
    .issue-detail {
        color: #444444 !important;
    }
    
    .issue-detail code {
        background: #f1f3f5 !important;
        color: #000000 !important;
        border: 1px solid #dee2e6 !important;
    }
    
    .issue-icon {
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
}