:root {
    /* ─── Core Palette ─── */
    --bg: #0a0f1e;
    --bg-elevated: #111827;
    --card: #1a2235;
    --card-hover: #1e293b;
    --text: #f1f5f9;
    --text-secondary: #e2e8f0;
    --muted: #94a3b8;
    --accent: #38bdf8;
    --accent-h: #0ea5e9;
    --accent-glow: rgba(56, 189, 248, 0.15);
    --success: #22c55e;
    --border: #1e293b;
    --border-light: #334155;

    /* ─── Spacing ─── */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ═══════════════════════════════════════════
   PERSISTENT TOOL NAV (all pages)
   ═══════════════════════════════════════════ */
.tool-nav {
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    padding: 0 16px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    position: sticky;
    top: 0;
    z-index: 100;
}

.tool-nav::-webkit-scrollbar { display: none; }

.tool-nav-inner {
    display: flex;
    align-items: center;
    gap: 2px;
    max-width: 960px;
    margin: 0 auto;
    padding: 6px 0;
}

.tool-nav-brand {
    font-weight: 800;
    font-size: 1rem;
    letter-spacing: -0.5px;
    margin-right: 16px;
    color: var(--text);
    text-decoration: none;
    white-space: nowrap;
    flex-shrink: 0;
}

.tool-nav-brand .hl { color: var(--accent); }

.tool-nav-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 7px 12px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    color: var(--muted);
    font-size: 0.82rem;
    font-weight: 500;
    white-space: nowrap;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.tool-nav-item:hover {
    color: var(--text);
    background: rgba(255, 255, 255, 0.05);
}

.tool-nav-item.active {
    color: var(--accent);
    background: var(--accent-glow);
}

.tool-nav-item .tn-icon {
    font-size: 1rem;
    line-height: 1;
}

.tool-nav-spacer { flex: 1; }

.tool-nav .lang-selector {
    display: flex;
    gap: 2px;
    flex-shrink: 0;
}

.tool-nav .lang-selector a {
    color: var(--muted);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.75rem;
    padding: 4px 6px;
    border-radius: 4px;
    transition: color 0.2s;
}

.tool-nav .lang-selector a:hover,
.tool-nav .lang-selector a.active-lang {
    color: var(--text);
    background: rgba(255, 255, 255, 0.05);
}

/* ═══════════════════════════════════════════
   MAIN WRAPPER
   ═══════════════════════════════════════════ */
.app-wrapper {
    max-width: 960px;
    margin: 0 auto;
    padding: 24px 20px;
    width: 100%;
    flex: 1;
}

/* Old nav — hide if tool-nav is present */
nav.old-nav { display: none; }

/* ═══════════════════════════════════════════
   BREADCRUMBS
   ═══════════════════════════════════════════ */
.breadcrumbs {
    font-size: 0.82rem;
    color: var(--muted);
    margin-bottom: 20px;
    padding: 0;
}
.breadcrumbs a { color: var(--accent); text-decoration: none; }
.breadcrumbs a:hover { text-decoration: underline; }
.breadcrumbs span.current { color: var(--text); font-weight: 600; }

/* ═══════════════════════════════════════════
   HERO
   ═══════════════════════════════════════════ */
.hero {
    text-align: center;
    margin-bottom: 32px;
    padding-top: 12px;
}

.hero h1 {
    font-size: 2.4rem;
    margin-bottom: 12px;
    line-height: 1.15;
    font-weight: 800;
    letter-spacing: -1px;
    background: linear-gradient(135deg, #fff 0%, #cbd5e1 50%, var(--accent) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--muted);
    font-size: 1.05rem;
    max-width: 540px;
    margin: 0 auto 16px;
}

.badges {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
}

.badge {
    background: rgba(56, 189, 248, 0.08);
    color: var(--accent);
    padding: 5px 14px;
    border-radius: 99px;
    font-size: 0.78rem;
    font-weight: 600;
    border: 1px solid rgba(56, 189, 248, 0.15);
}

/* ═══════════════════════════════════════════
   TOOL HUB (Homepage Grid)
   ═══════════════════════════════════════════ */
.tool-hub {
    margin-bottom: 32px;
    text-align: center;
}

.tool-hub-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 4px;
    background: linear-gradient(90deg, var(--accent), #a78bfa, #f472b6);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.tool-hub-tagline {
    color: var(--muted);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 14px;
}

.tool-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 24px 14px 18px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--text);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    padding: 1px;
    background: linear-gradient(135deg, transparent 30%, var(--card-accent, var(--accent)) 100%);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.tool-card:hover {
    transform: translateY(-4px);
    box-shadow:
        0 12px 40px rgba(0, 0, 0, 0.4),
        0 0 30px rgba(56, 189, 248, 0.06);
    background: var(--card-hover);
}

.tool-card:hover::before {
    opacity: 1;
}

.tool-card-icon {
    font-size: 2.2rem;
    line-height: 1;
    filter: drop-shadow(0 2px 8px rgba(0,0,0,0.3));
}

.tool-card-name {
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: -0.3px;
}

.tool-card-desc {
    font-size: 0.78rem;
    color: var(--muted);
    line-height: 1.35;
    max-width: 200px;
}

.tool-hub-trust {
    font-size: 0.78rem;
    color: var(--muted);
    opacity: 0.6;
    margin: 0;
}

/* ═══════════════════════════════════════════
   DROPZONE
   ═══════════════════════════════════════════ */
.dropzone {
    background: var(--card);
    border: 2px dashed var(--border-light);
    border-radius: var(--radius-lg);
    padding: 50px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 20px;
}

.dropzone:hover,
.dropzone.dragover {
    border-color: var(--accent);
    background: var(--accent-glow);
    box-shadow: 0 0 40px rgba(56, 189, 248, 0.08);
}

.dz-content .icon {
    font-size: 2.8rem;
    display: block;
    margin-bottom: 12px;
}

.dz-text {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.dz-sub {
    color: var(--muted);
    font-size: 0.85rem;
    margin-bottom: 16px;
}

.btn-browse {
    background: var(--accent);
    color: var(--bg);
    border: none;
    padding: 10px 28px;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-browse:hover {
    transform: scale(1.03);
    background: var(--accent-h);
    box-shadow: 0 4px 15px rgba(56, 189, 248, 0.3);
}

/* ═══════════════════════════════════════════
   FILE LIST (Chips)
   ═══════════════════════════════════════════ */
.file-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.file-chip {
    display: inline-flex;
    align-items: center;
    background: rgba(56, 189, 248, 0.08);
    border: 1px solid rgba(56, 189, 248, 0.15);
    border-radius: 6px;
    padding: 0.25rem 0.6rem;
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.file-chip .name {
    margin-right: 0.5rem;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-chip .btn-remove {
    background: none;
    border: none;
    color: var(--muted);
    cursor: pointer;
    font-size: 1.1rem;
    line-height: 1;
    padding: 0;
    margin-left: 4px;
}

.file-chip .btn-remove:hover { color: #ef4444; }

/* ═══════════════════════════════════════════
   WORKSPACE (Results)
   ═══════════════════════════════════════════ */
.hidden { display: none !important; }

.stats-bar {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    color: var(--muted);
    font-size: 0.85rem;
}

.token-badge {
    color: var(--success);
    font-family: 'JetBrains Mono', 'Consolas', monospace;
    font-weight: bold;
    font-size: 0.82rem;
}

.preview-box {
    background: rgba(0, 0, 0, 0.4);
    padding: 20px;
    border-radius: var(--radius-md);
    font-family: 'JetBrains Mono', 'Consolas', monospace;
    font-size: 0.85rem;
    color: #e2e8f0;
    white-space: pre-wrap;
    word-break: break-word;
    max-height: 500px;
    overflow-y: auto;
    border: 1px solid var(--border);
}

.actions {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.btn {
    flex: 1;
    padding: 11px;
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn:hover { opacity: 0.9; transform: translateY(-1px); }

.btn-primary {
    background: var(--success);
    color: #000;
}

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

.btn-ghost {
    background: transparent;
    color: #ef4444;
    flex: 0;
    min-width: auto;
}

/* ═══════════════════════════════════════════
   SEO CONTENT & FAQ
   ═══════════════════════════════════════════ */
.seo-content {
    margin-top: 48px;
    border-top: 1px solid var(--border);
    padding-top: 36px;
}

.seo-content h2 {
    font-size: 1.6rem;
    margin-bottom: 16px;
    color: var(--text);
    font-weight: 700;
}

.seo-content h3 {
    font-size: 1.2rem;
    margin: 24px 0 12px;
    color: var(--text-secondary);
}

.seo-content p {
    color: var(--muted);
    margin-bottom: 20px;
    font-size: 0.95rem;
    line-height: 1.7;
}

.seo-content ol, .seo-content ul {
    color: var(--muted);
    padding-left: 20px;
    margin-bottom: 20px;
}

.seo-content li {
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
    margin: 28px 0;
}

.card {
    background: var(--card);
    padding: 22px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    transition: border-color 0.2s ease;
}

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

.card h3 {
    color: var(--accent);
    margin-bottom: 8px;
    font-size: 1.05rem;
}

.card p {
    font-size: 0.9rem;
    color: var(--muted);
    margin: 0;
    line-height: 1.5;
}

.faq { margin-top: 12px; }

.faq details {
    background: var(--card);
    margin-bottom: 8px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: border-color 0.2s ease;
}

.faq details[open] {
    border-color: var(--border-light);
}

.faq summary {
    padding: 14px 16px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.faq summary:hover { color: var(--accent); }

.faq p {
    padding: 0 16px 14px;
    color: var(--muted);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ─── Cross-links ─── */
.tool-links {
    list-style: none;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 16px 0;
}

.tool-links li { margin: 0; }

.tool-links a {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 14px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 99px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.tool-links a:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-glow);
}

/* ─── Comparison table ─── */
.seo-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 0.9rem;
}

.seo-content th, .seo-content td {
    padding: 10px 14px;
    border: 1px solid var(--border);
    text-align: left;
}

.seo-content th {
    background: var(--card);
    color: var(--text);
    font-weight: 600;
}

.seo-content td {
    color: var(--muted);
}

/* ═══════════════════════════════════════════
   MONETIZATION
   ═══════════════════════════════════════════ */
.ad-container {
    min-height: 90px;
    margin: 20px 0;
    background: rgba(0, 0, 0, 0.15);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ═══════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════ */
footer {
    text-align: center;
    padding: 32px 20px 18px;
    color: var(--muted);
    border-top: 1px solid var(--border);
    margin-top: auto;
    font-size: 0.82rem;
    background: var(--bg-elevated);
}

footer a {
    color: var(--muted);
    text-decoration: underline;
    text-underline-offset: 2px;
}

footer a:hover { color: var(--text); }

/* ═══════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════ */
@media (max-width: 768px) {
    .hero h1 { font-size: 1.9rem; }
    .tool-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    .tool-card { padding: 18px 10px 14px; }
    .tool-card-icon { font-size: 1.8rem; }
    .tool-nav-item .tn-label { display: none; }
    .tool-nav-item { padding: 7px 8px; }
    .features-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .app-wrapper { padding: 16px 14px; }
    .hero h1 { font-size: 1.6rem; }
    .hero { margin-bottom: 24px; }
    .tool-grid { gap: 8px; }
    .tool-card { padding: 14px 8px 12px; }
    .tool-card-desc { display: none; }
    .tool-card-name { font-size: 0.85rem; }
    .badge { font-size: 0.72rem; padding: 3px 10px; }
    .actions { flex-direction: column; }
    .btn-ghost { width: 100%; margin-top: 8px; }
    .dropzone { padding: 36px 14px; }
}

/* ═══════════════════════════════════════════
   LEGACY COMPAT (hide old nav when tool-nav exists)
   ═══════════════════════════════════════════ */
body:has(.tool-nav) nav:not(.tool-nav) {
    display: none;
}

/* ═══════════════════════════════════════════
   TOOL CATEGORIES (Homepage)
   ═══════════════════════════════════════════ */
.tool-category {
    margin-bottom: 28px;
    text-align: left;
}

.tool-category-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 14px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--cat-color, var(--accent));
    display: inline-block;
    letter-spacing: -0.3px;
}

/* Popular badge on tool cards */
.tool-card.popular {
    border-color: rgba(239, 68, 68, 0.25);
    background: linear-gradient(135deg, var(--card) 0%, rgba(239, 68, 68, 0.05) 100%);
}

.popular-badge {
    position: absolute;
    top: 6px;
    right: 8px;
    font-size: 0.85rem;
    line-height: 1;
    filter: drop-shadow(0 1px 4px rgba(239, 68, 68, 0.4));
    animation: pulse-fire 2s ease-in-out infinite;
}

@keyframes pulse-fire {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

@media (max-width: 768px) {
    .tool-category-title { font-size: 1rem; }
}