/* ================================================
   WB Toolkit — 2026 Design System
   Dark editorial + mesh gradients + grain texture
   ================================================ */

:root {
    --bg: #0a0a0f;
    --bg-elevated: #12121a;
    --bg-card: #16161f;
    --bg-input: #1a1a25;
    --surface: #1e1e2a;
    --border: rgba(255,255,255,0.06);
    --border-hover: rgba(255,255,255,0.12);
    
    --text: #e8e6f0;
    --text-secondary: #8b89a0;
    --text-dim: #5a587a;
    
    --accent: #6ee7b7;
    --accent-warm: #fbbf24;
    --accent-purple: #a78bfa;
    --accent-pink: #f472b6;
    --accent-blue: #60a5fa;
    --danger: #fb7185;
    --success: #34d399;
    
    --radius-sm: 8px;
    --radius: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    
    --font: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --shadow: 0 4px 24px rgba(0,0,0,0.3);
    --shadow-lg: 0 12px 48px rgba(0,0,0,0.4);
    --glow-accent: 0 0 40px rgba(110,231,183,0.15);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Grain overlay */
.grain-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    pointer-events: none;
    opacity: 0.025;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    background-size: 128px 128px;
}

/* ========== NAVIGATION ========== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10,10,15,0.75);
    backdrop-filter: blur(20px) saturate(1.4);
    -webkit-backdrop-filter: blur(20px) saturate(1.4);
    border-bottom: 1px solid var(--border);
    transition: background 0.3s;
}

.nav__inner {
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text);
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: -0.02em;
}

.nav__logo-accent { color: var(--accent); }

.nav__links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav__link {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.82rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all 0.2s;
    white-space: nowrap;
}

.nav__link:hover,
.nav__link.active {
    color: var(--text);
    background: rgba(255,255,255,0.06);
}

.nav__link.active { color: var(--accent); }

.nav__link-icon { font-size: 0.9rem; }

.nav__burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav__burger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all 0.3s;
}

.nav__burger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav__burger.active span:nth-child(2) { opacity: 0; }
.nav__burger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile nav */
.mobile-nav {
    position: fixed;
    inset: 0;
    z-index: 999;
    background: rgba(10,10,15,0.97);
    backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s;
}

.mobile-nav.active { opacity: 1; pointer-events: auto; }

.mobile-nav__links {
    display: flex;
    flex-direction: column;
    gap: 8px;
    text-align: center;
}

.mobile-nav__links a {
    color: var(--text);
    text-decoration: none;
    font-size: 1.3rem;
    font-weight: 600;
    padding: 14px 28px;
    border-radius: var(--radius);
    transition: all 0.2s;
}

.mobile-nav__links a:hover { background: rgba(255,255,255,0.06); color: var(--accent); }

/* ========== HERO ========== */
.section { padding-top: 64px; }

.section--hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.section--hero::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(ellipse, rgba(110,231,183,0.08) 0%, rgba(167,139,250,0.06) 40%, transparent 70%);
    pointer-events: none;
    animation: float 20s ease-in-out infinite;
}

.section--hero::after {
    content: '';
    position: absolute;
    bottom: -20%;
    left: -15%;
    width: 600px;
    height: 600px;
    background: radial-gradient(ellipse, rgba(251,191,36,0.06) 0%, rgba(244,114,182,0.04) 40%, transparent 70%);
    pointer-events: none;
    animation: float 25s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, -40px) scale(1.05); }
}

.hero {
    max-width: 1320px;
    margin: 0 auto;
    padding: 60px 24px;
    position: relative;
    z-index: 1;
    width: 100%;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: rgba(110,231,183,0.08);
    border: 1px solid rgba(110,231,183,0.15);
    border-radius: 100px;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--accent);
    margin-bottom: 32px;
    animation: fadeInUp 0.6s ease-out both;
}

.hero__badge-dot {
    width: 7px;
    height: 7px;
    background: var(--accent);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
}

.hero__title {
    font-size: clamp(2.8rem, 7vw, 5.5rem);
    font-weight: 900;
    line-height: 1.05;
    letter-spacing: -0.04em;
    margin-bottom: 24px;
    animation: fadeInUp 0.6s 0.1s ease-out both;
}

.hero__title-gradient {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-purple) 50%, var(--accent-pink) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 580px;
    line-height: 1.7;
    margin-bottom: 56px;
    animation: fadeInUp 0.6s 0.2s ease-out both;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Hero cards grid */
.hero__cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    animation: fadeInUp 0.6s 0.3s ease-out both;
}

.hero__card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    cursor: pointer;
    transition: all 0.35s cubic-bezier(0.22, 1, 0.36, 1);
    overflow: hidden;
}

.hero__card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(110,231,183,0.04) 0%, transparent 60%);
    opacity: 0;
    transition: opacity 0.35s;
}

.hero__card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: var(--glow-accent);
}

.hero__card:hover::before { opacity: 1; }

.hero__card-icon { font-size: 1.8rem; margin-bottom: 14px; }

.hero__card-title {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.hero__card-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.hero__card-arrow {
    position: absolute;
    top: 24px;
    right: 24px;
    font-size: 1.3rem;
    color: var(--text-dim);
    transition: all 0.3s;
}

.hero__card:hover .hero__card-arrow {
    color: var(--accent);
    transform: translateX(4px);
}

/* ========== TOOL SECTIONS ========== */
.section--tool {
    min-height: calc(100vh - 64px);
    padding: 104px 24px 60px;
}

.tool {
    max-width: 960px;
    margin: 0 auto;
}

.tool__header {
    margin-bottom: 40px;
    animation: fadeInUp 0.5s ease-out both;
}

.tool__tag {
    display: inline-block;
    padding: 5px 14px;
    background: rgba(167,139,250,0.1);
    border: 1px solid rgba(167,139,250,0.2);
    border-radius: 100px;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--accent-purple);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
}

.tool__title {
    font-size: clamp(1.6rem, 4vw, 2.4rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 12px;
}

.tool__desc {
    color: var(--text-secondary);
    font-size: 1rem;
    max-width: 680px;
    line-height: 1.65;
}

.tool__body {
    animation: fadeInUp 0.5s 0.1s ease-out both;
}

/* ========== FORM ELEMENTS ========== */
.input-group {
    margin-bottom: 20px;
}

.input-group--flex { flex: 1; }

.input-group--small { width: 180px; flex-shrink: 0; }

.input-row {
    display: flex;
    gap: 16px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.input-label {
    display: block;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
    letter-spacing: 0.01em;
}

.input-field,
.input-textarea {
    width: 100%;
    padding: 14px 18px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.95rem;
    transition: all 0.25s;
    outline: none;
}

.input-field:focus,
.input-textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(110,231,183,0.1);
}

.input-field::placeholder,
.input-textarea::placeholder {
    color: var(--text-dim);
}

.input-textarea { resize: vertical; min-height: 120px; line-height: 1.6; }

.input-hint {
    font-size: 0.75rem;
    color: var(--text-dim);
    margin-top: 6px;
}

.input-counter {
    text-align: right;
    font-size: 0.72rem;
    color: var(--text-dim);
    font-family: var(--font-mono);
    margin-top: 4px;
}

/* Filter chips */
.filter-chips {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.chip {
    display: flex;
    align-items: center;
    gap: 7px;
    padding: 8px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.82rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    user-select: none;
}

.chip:hover { border-color: var(--border-hover); color: var(--text); }

.chip input[type="checkbox"] {
    width: 14px;
    height: 14px;
    accent-color: var(--accent);
}

/* Buttons */
.tool__actions {
    display: flex;
    gap: 12px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border: none;
    border-radius: var(--radius);
    font-family: var(--font);
    font-size: 0.92rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
    outline: none;
}

.btn--primary {
    background: var(--accent);
    color: #0a0a0f;
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(110,231,183,0.25);
}

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

.btn--secondary {
    background: var(--surface);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.btn--secondary:hover {
    background: var(--bg-card);
    color: var(--text);
    border-color: var(--border-hover);
}

.btn__icon { font-size: 1rem; }

/* ========== RESULTS AREA ========== */
.results-area { min-height: 40px; }

/* Loading */
.loading {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 24px;
    color: var(--text-secondary);
    font-size: 0.92rem;
}

.loading__spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Result cards */
.result-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    margin-bottom: 16px;
    animation: fadeInUp 0.4s ease-out both;
}

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

.result-card__title {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.result-card__count {
    font-size: 0.78rem;
    font-family: var(--font-mono);
    color: var(--accent);
    background: rgba(110,231,183,0.1);
    padding: 4px 12px;
    border-radius: 100px;
}

/* Data table */
.data-table-wrap {
    overflow-x: auto;
    margin: 0 -8px;
    padding: 0 8px;
    -webkit-overflow-scrolling: touch;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.data-table th {
    text-align: left;
    padding: 10px 14px;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
    position: sticky;
    top: 0;
    background: var(--bg-card);
}

.data-table td {
    padding: 10px 14px;
    border-bottom: 1px solid rgba(255,255,255,0.03);
    color: var(--text);
    vertical-align: middle;
}

.data-table tr:hover td { background: rgba(255,255,255,0.02); }

.data-table .mono {
    font-family: var(--font-mono);
    font-size: 0.82rem;
}

.data-table .highlight { color: var(--accent); font-weight: 600; }
.data-table .warm { color: var(--accent-warm); }
.data-table .purple { color: var(--accent-purple); }

/* Product card in results */
.product-row {
    display: flex;
    align-items: center;
    gap: 14px;
}

.product-row__img {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    background: var(--surface);
    flex-shrink: 0;
}

.product-row__info { min-width: 0; }

.product-row__name {
    font-weight: 600;
    font-size: 0.85rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 280px;
}

.product-row__brand {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Tags / clusters */
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}

.tag {
    display: inline-block;
    padding: 6px 14px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.78rem;
    color: var(--text-secondary);
    transition: all 0.2s;
    cursor: default;
}

.tag--accent { border-color: rgba(110,231,183,0.2); color: var(--accent); background: rgba(110,231,183,0.06); }
.tag--warm { border-color: rgba(251,191,36,0.2); color: var(--accent-warm); background: rgba(251,191,36,0.06); }
.tag--purple { border-color: rgba(167,139,250,0.2); color: var(--accent-purple); background: rgba(167,139,250,0.06); }

/* Stat blocks */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 12px;
    margin-bottom: 24px;
}

.stat-block {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
    text-align: center;
}

.stat-block__value {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 4px;
}

.stat-block__value--accent { color: var(--accent); }
.stat-block__value--warm { color: var(--accent-warm); }
.stat-block__value--purple { color: var(--accent-purple); }
.stat-block__value--pink { color: var(--accent-pink); }
.stat-block__value--blue { color: var(--accent-blue); }
.stat-block__value--danger { color: var(--danger); }
.stat-block__value--success { color: var(--success); }

.stat-block__label {
    font-size: 0.72rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

/* SEO score bar */
.seo-score {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.seo-score__bar {
    flex: 1;
    height: 10px;
    background: var(--surface);
    border-radius: 100px;
    overflow: hidden;
}

.seo-score__fill {
    height: 100%;
    border-radius: 100px;
    transition: width 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.seo-score__value {
    font-size: 1.4rem;
    font-weight: 800;
    font-family: var(--font-mono);
    min-width: 60px;
    text-align: right;
}

/* SEO checklist */
.seo-check {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255,255,255,0.03);
}

.seo-check__icon { font-size: 1.1rem; flex-shrink: 0; margin-top: 2px; }
.seo-check__text { font-size: 0.88rem; line-height: 1.5; }
.seo-check--pass .seo-check__text { color: var(--text); }
.seo-check--fail .seo-check__text { color: var(--text-secondary); }
.seo-check--warn .seo-check__text { color: var(--accent-warm); }

/* Error */
.error-msg {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 18px 24px;
    background: rgba(251,113,133,0.08);
    border: 1px solid rgba(251,113,133,0.15);
    border-radius: var(--radius);
    color: var(--danger);
    font-size: 0.88rem;
}

/* Export button */
.btn--export {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    font-size: 0.8rem;
    padding: 8px 16px;
}

.btn--export:hover { color: var(--accent); border-color: var(--accent); }

/* ========== FOOTER ========== */
.footer {
    border-top: 1px solid var(--border);
    padding: 32px 24px;
    margin-top: 60px;
}

.footer__inner {
    max-width: 1320px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

.footer__brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.footer__note {
    font-size: 0.75rem;
    color: var(--text-dim);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
    .nav__links { display: none; }
    .nav__burger { display: flex; }
    .hero__cards { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .hero__cards { grid-template-columns: 1fr; }
    .hero__title { font-size: 2.4rem; }
    .hero__subtitle { font-size: 1rem; }
    .input-row { flex-direction: column; }
    .input-group--small { width: 100%; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .result-card { padding: 20px; }
    .footer__inner { flex-direction: column; text-align: center; }
    .section--tool { padding: 88px 16px 40px; }
    .tool__actions { flex-direction: column; }
    .btn { width: 100%; justify-content: center; }
}

@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .hero__card { padding: 20px; }
    .data-table { font-size: 0.78rem; }
    .data-table th, .data-table td { padding: 8px 10px; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.08); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.14); }

/* Selection */
::selection { background: rgba(110,231,183,0.25); color: var(--text); }