/* ========== DESIGN TOKENS ========== */
:root {
    --color-primary: #4F46E5;
    --color-primary-dark: #4338CA;
    --color-primary-light: #EEF2FF;
    --color-del: #EF4444;
    --color-del-bg: #FEF2F2;
    --color-del-bg-strong: #FEE2E2;
    --color-ins: #22C55E;
    --color-ins-bg: #F0FDF4;
    --color-ins-bg-strong: #DCFCE7;
    --color-text: #1E293B;
    --color-text-secondary: #64748B;
    --color-bg: #F8FAFC;
    --color-surface: #FFFFFF;
    --color-border: #E2E8F0;
    --color-border-light: #F1F5F9;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.1);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
}

/* ========== RESET ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ========== HEADER ========== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}
.header-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--color-text);
}
.logo-icon { flex-shrink: 0; }
.logo-text { font-size: 20px; font-weight: 700; letter-spacing: -0.3px; }
.header-nav { display: flex; align-items: center; gap: 28px; }
.header-nav a {
    text-decoration: none;
    color: var(--color-text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}
.header-nav a:hover { color: var(--color-primary); }

/* Upgrade button in header */
.btn-upgrade-header {
    padding: 6px 16px;
    background: var(--color-primary);
    color: #fff;
    font-size: 13px;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.2s;
}
.btn-upgrade-header:hover { background: var(--color-primary-dark); }

/* ========== HERO ========== */
.hero {
    padding: 64px 24px 48px;
    text-align: center;
    background: linear-gradient(180deg, var(--color-primary-light) 0%, var(--color-bg) 100%);
}
.hero-inner { max-width: 680px; margin: 0 auto; }
.hero h1 {
    font-size: clamp(28px, 5vw, 44px);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.5px;
    color: var(--color-text);
}
.hero-accent { color: var(--color-primary); }
.hero-sub {
    margin-top: 16px;
    font-size: 17px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}
.hero-cta {
    display: inline-block;
    margin-top: 28px;
    padding: 12px 32px;
    background: var(--color-primary);
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    border-radius: 8px;
    text-decoration: none;
    transition: background 0.2s, transform 0.15s;
    box-shadow: 0 2px 8px rgba(79,70,229,0.3);
}
.hero-cta:hover { background: var(--color-primary-dark); transform: translateY(-1px); }

/* ========== TOOL SECTION ========== */
.tool-section {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px 48px;
}

/* Toolbar */
.toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
}
.toolbar-left, .toolbar-right { display: flex; align-items: center; gap: 16px; }
.stats-panel {
    display: flex;
    gap: 16px;
    font-size: 13px;
    color: var(--color-text-secondary);
}
.stat-item { display: flex; align-items: center; gap: 6px; }
.stat-item b { color: var(--color-text); font-weight: 700; }
.stat-sep { padding-left: 16px; border-left: 1px solid var(--color-border); }
.dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; flex-shrink: 0; }
.dot-del { background: var(--color-del); }
.dot-ins { background: var(--color-ins); }

/* Usage Counter */
.usage-counter {
    font-size: 12px;
    color: var(--color-text-secondary);
    padding: 4px 12px;
    background: var(--color-border-light);
    border-radius: 20px;
    border: 1px solid var(--color-border);
    white-space: nowrap;
}
.usage-counter b { color: var(--color-primary); font-weight: 700; }
.pro-status {
    font-size: 11px;
    font-weight: 700;
    color: #fff;
    background: var(--color-primary);
    padding: 2px 10px;
    border-radius: 20px;
    letter-spacing: 0.5px;
}
.pro-expiry {
    font-size: 11px;
    color: var(--color-text-secondary);
    margin-left: 4px;
}
.pro-manage {
    font-size: 11px;
    color: var(--color-primary);
    margin-left: 8px;
    text-decoration: none;
    font-weight: 500;
}
.pro-manage:hover { text-decoration: underline; }
.pro-expired {
    font-size: 11px;
    font-weight: 600;
    color: var(--color-del);
    background: var(--color-del-bg);
    padding: 2px 10px;
    border-radius: 20px;
}
.pro-renew {
    font-size: 11px;
    color: var(--color-primary);
    margin-left: 8px;
    text-decoration: none;
    font-weight: 600;
}
.pro-renew:hover { text-decoration: underline; }

/* Pro Badge on export buttons */
.pro-badge {
    font-size: 9px;
    font-weight: 700;
    color: var(--color-primary);
    background: var(--color-primary-light);
    padding: 1px 5px;
    border-radius: 3px;
    text-transform: uppercase;
    letter-spacing: 0.3px;
    margin-left: 2px;
    vertical-align: middle;
}

.options-group {
    display: flex;
    flex-wrap: wrap;
    gap: 4px 16px;
    padding-left: 16px;
    border-left: 1px solid var(--color-border);
}
.toggle-label {
    font-size: 12px;
    color: var(--color-text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
    user-select: none;
    transition: color 0.2s;
}
.toggle-label:hover { color: var(--color-primary); }
.toggle-label input[type="checkbox"] { accent-color: var(--color-primary); }

.nav-btn-group { display: flex; gap: 4px; }
.nav-btn {
    width: 30px; height: 30px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    color: var(--color-text-secondary);
    transition: all 0.2s;
}
.nav-btn:hover { border-color: var(--color-primary); color: var(--color-primary); background: var(--color-primary-light); }

/* Editor Layout */
.editor-layout {
    display: flex;
    gap: 16px;
    height: 520px;
}
.input-column {
    display: flex;
    flex-direction: column;
    width: 35%;
    min-width: 320px;
    gap: 12px;
}
.text-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    position: relative;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.text-wrapper:focus-within { border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(79,70,229,0.1); }
.text-wrapper.active-source { border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(79,70,229,0.15); }

.panel-header {
    background: var(--color-border-light);
    padding: 8px 14px;
    border-bottom: 1px solid var(--color-border);
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.panel-title { display: flex; align-items: center; gap: 8px; }
.btn-demo {
    font-size: 11px;
    padding: 2px 10px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    background: var(--color-surface);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}
.btn-demo:hover { border-color: var(--color-primary); color: var(--color-primary); }

textarea {
    flex: 1;
    border: none;
    padding: 14px;
    resize: none;
    outline: none;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-surface);
}
textarea::placeholder { color: #94A3B8; }

.drag-overlay {
    position: absolute;
    inset: 0;
    background: rgba(79,70,229,0.04);
    border: 2px dashed var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
    color: var(--color-primary);
    z-index: 10;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
    border-radius: var(--radius-md);
}
.text-wrapper.drag-active .drag-overlay { opacity: 1; }
.loading-overlay {
    position: absolute;
    inset: 0;
    background: rgba(255,255,255,0.95);
    z-index: 20;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: var(--color-text-secondary);
}

/* Action Buttons */
.action-column {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 10px;
    min-width: 64px;
}
.btn-action {
    width: 64px; height: 64px;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    font-size: 11px;
    font-weight: 600;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: all 0.2s;
}
.btn-run {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 2px 8px rgba(79,70,229,0.3);
}
.btn-run:hover { background: var(--color-primary-dark); transform: translateY(-1px); }
.btn-clear {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
}
.btn-clear:hover { color: var(--color-del); border-color: var(--color-del); background: var(--color-del-bg); }

/* Result Panel */
.result-wrapper {
    flex: 1;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    position: relative;
}
.result-header-left { display: flex; align-items: center; gap: 14px; }
.view-switcher {
    display: flex;
    background: var(--color-border-light);
    padding: 2px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}
.view-btn {
    border: none;
    background: transparent;
    padding: 4px 12px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    color: var(--color-text-secondary);
    border-radius: 4px;
    transition: all 0.2s;
}
.view-btn.active {
    background: var(--color-surface);
    color: var(--color-primary);
    box-shadow: 0 1px 2px rgba(0,0,0,0.06);
}
#result-container {
    flex: 1;
    overflow-y: auto;
    scroll-behavior: smooth;
    position: relative;
}

.export-btn-group { display: flex; gap: 6px; }
.btn-export {
    font-size: 12px;
    padding: 5px 12px;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    cursor: pointer;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: 5px;
    font-weight: 500;
    transition: all 0.2s;
}
.btn-export:hover { border-color: var(--color-primary); color: var(--color-primary); background: var(--color-primary-light); }
.btn-export.export-disabled {
    opacity: 0.6;
    cursor: default;
}
.btn-export.export-disabled:hover {
    border-color: var(--color-border);
    color: var(--color-text-secondary);
    background: var(--color-surface);
}

/* Diff Result Styles */
.view-inline {
    padding: 32px 40px;
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.8;
    white-space: pre-wrap;
    word-break: break-word;
}
.view-inline del {
    color: var(--color-del);
    background: var(--color-del-bg-strong);
    text-decoration: line-through;
    border-radius: 2px;
    padding: 0 2px;
}
.view-inline ins {
    color: var(--color-ins);
    background: var(--color-ins-bg-strong);
    text-decoration: none;
    border-bottom: 2px solid var(--color-ins);
    padding: 0 2px;
    border-radius: 2px;
}
.diff-table {
    width: 100%;
    border-collapse: collapse;
    table-layout: fixed;
    font-family: var(--font-mono);
    font-size: 13px;
}
.diff-table td {
    padding: 4px 10px;
    border-bottom: 1px solid var(--color-border-light);
    vertical-align: top;
    word-break: break-all;
    line-height: 1.5;
}
.diff-table tr:hover { background: #FAFBFC; }
.col-content { width: 50%; }
.del-bg { background: var(--color-del-bg); }
.ins-bg { background: var(--color-ins-bg); }
.mod-bg { background: var(--color-surface); }
.side-del { color: var(--color-del); background: var(--color-del-bg-strong); text-decoration: line-through; }
.side-ins { color: var(--color-ins); background: var(--color-ins-bg-strong); border-bottom: 1px solid var(--color-ins); }
.diff-focus { outline: 3px solid #F59E0B; outline-offset: -2px; background: rgba(245,158,11,0.08); }

/* ========== CROSS-FORMAT PREVIEW OVERLAY ========== */
.preview-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 220px;
    background: linear-gradient(to bottom, rgba(255,255,255,0) 0%, rgba(255,255,255,0.95) 40%, #fff 100%);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 28px;
    z-index: 10;
    pointer-events: none;
}
.preview-overlay-content {
    text-align: center;
    pointer-events: auto;
}
.preview-overlay-icon { margin-bottom: 8px; }
.preview-overlay-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 4px;
}
.preview-overlay-body {
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-bottom: 16px;
}

/* ========== PRICING SECTION ========== */
.pricing-section {
    padding: 72px 24px;
    background: var(--color-bg);
}
.pricing-sub {
    text-align: center;
    font-size: 16px;
    color: var(--color-text-secondary);
    margin-top: -36px;
    margin-bottom: 48px;
}
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 720px;
    margin: 0 auto;
}
.pricing-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    position: relative;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.pricing-card:hover { box-shadow: var(--shadow-md); }
.pricing-card-pro {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 1px var(--color-primary), var(--shadow-md);
}
.pricing-popular {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    padding: 4px 14px;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.pricing-card-header { margin-bottom: 24px; }
.pricing-card-header h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 4px;
}
.pricing-price {
    font-size: 36px;
    font-weight: 800;
    color: var(--color-text);
    letter-spacing: -1px;
}
.pricing-price span {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-secondary);
    letter-spacing: 0;
}
.pricing-features {
    list-style: none;
    margin-bottom: 28px;
}
.pricing-features li {
    font-size: 14px;
    color: var(--color-text-secondary);
    padding: 6px 0;
    padding-left: 24px;
    position: relative;
}
.pricing-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 14px;
    height: 14px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%2322C55E' stroke-width='3'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E") no-repeat center;
}
.pricing-cta {
    display: block;
    text-align: center;
    padding: 10px 24px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    width: 100%;
}
.pricing-cta-secondary {
    background: var(--color-border-light);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}
.pricing-cta-secondary:hover { background: var(--color-border); }
.pricing-cta-primary {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 2px 8px rgba(79,70,229,0.3);
}
.pricing-cta-primary:hover { background: var(--color-primary-dark); }

/* ========== FEATURES ========== */
.features-section {
    padding: 72px 24px;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
}
.section-inner { max-width: 1080px; margin: 0 auto; }
.features-section h2, .faq-section h2, .pricing-section h2 {
    text-align: center;
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 48px;
    letter-spacing: -0.3px;
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.feature-card {
    padding: 28px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: border-color 0.2s, box-shadow 0.2s;
}
.feature-card:hover { border-color: var(--color-primary); box-shadow: var(--shadow-md); }
.feature-icon { margin-bottom: 16px; }
.feature-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.feature-card p { font-size: 14px; color: var(--color-text-secondary); line-height: 1.6; }

/* ========== FAQ ========== */
.faq-section { padding: 72px 24px; }
.faq-list { max-width: 720px; margin: 0 auto; }
.faq-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: 10px;
    overflow: hidden;
    transition: border-color 0.2s;
}
.faq-item[open] { border-color: var(--color-primary); }
.faq-item summary {
    padding: 16px 20px;
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background 0.2s;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
    content: '+';
    font-size: 20px;
    font-weight: 300;
    color: var(--color-text-secondary);
    transition: transform 0.2s;
}
.faq-item[open] summary::after { content: '-'; }
.faq-item summary:hover { background: var(--color-border-light); }
.faq-item p { padding: 0 20px 16px; font-size: 14px; color: var(--color-text-secondary); line-height: 1.7; }

/* ========== FOOTER ========== */
.site-footer {
    background: var(--color-text);
    color: #CBD5E1;
    padding: 48px 24px 0;
}
.footer-inner {
    max-width: 1080px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    gap: 48px;
    padding-bottom: 40px;
}
.footer-brand .logo-text { color: #fff; }
.footer-tagline { font-size: 14px; margin-top: 8px; color: #94A3B8; }
.footer-links { display: flex; gap: 64px; }
.footer-col { display: flex; flex-direction: column; gap: 8px; }
.footer-col h4 { font-size: 13px; font-weight: 700; color: #fff; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 4px; }
.footer-col a { font-size: 14px; color: #94A3B8; text-decoration: none; transition: color 0.2s; }
.footer-col a:hover { color: #fff; }
.footer-bottom {
    border-top: 1px solid #334155;
    padding: 16px 0;
    text-align: center;
    max-width: 1080px;
    margin: 0 auto;
}
.footer-bottom p { font-size: 13px; color: #64748B; }

/* ========== PAYWALL MODAL ========== */
.paywall-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(4px);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s, visibility 0.25s;
}
.paywall-backdrop.active { opacity: 1; visibility: visible; }

.paywall-modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.95);
    z-index: 1000;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 36px 32px 28px;
    width: 400px;
    max-width: calc(100vw - 32px);
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s, visibility 0.25s, transform 0.25s;
    text-align: center;
}
.paywall-modal.active { opacity: 1; visibility: visible; transform: translate(-50%, -50%) scale(1); }

.paywall-close {
    position: absolute;
    top: 12px;
    right: 16px;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--color-text-secondary);
    cursor: pointer;
    line-height: 1;
    padding: 4px;
    transition: color 0.2s;
}
.paywall-close:hover { color: var(--color-text); }

.paywall-icon { margin-bottom: 12px; }
.paywall-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 8px;
}
.paywall-body {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: 20px;
    line-height: 1.5;
}
.paywall-benefits {
    list-style: none;
    text-align: left;
    margin-bottom: 24px;
    padding: 0 12px;
}
.paywall-benefits li {
    font-size: 14px;
    color: var(--color-text);
    padding: 6px 0;
    display: flex;
    align-items: center;
    gap: 10px;
}
.paywall-benefits li svg { flex-shrink: 0; }
.paywall-actions { display: flex; flex-direction: column; gap: 8px; }
.paywall-btn-primary {
    padding: 12px 24px;
    background: var(--color-primary);
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.2s;
    box-shadow: 0 2px 8px rgba(79,70,229,0.3);
}
.paywall-btn-primary:hover { background: var(--color-primary-dark); }
.paywall-btn-secondary {
    padding: 8px 24px;
    background: none;
    border: none;
    color: var(--color-text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: color 0.2s;
}
.paywall-btn-secondary:hover { color: var(--color-text); }

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
    .editor-layout { flex-direction: column; height: auto; }
    .input-column { width: 100%; flex-direction: row; height: 280px; min-width: 0; }
    .action-column { flex-direction: row; justify-content: center; }
    .result-wrapper { min-height: 400px; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .toolbar { flex-direction: column; align-items: stretch; }
    .toolbar-left, .toolbar-right { justify-content: center; flex-wrap: wrap; }
    .options-group { border-left: none; padding-left: 0; }
    .pricing-grid { max-width: 540px; }
}
@media (max-width: 640px) {
    .hero { padding: 40px 16px 32px; }
    .hero h1 { font-size: 26px; }
    .input-column { flex-direction: column; height: auto; }
    .text-wrapper { min-height: 160px; }
    .features-grid { grid-template-columns: 1fr; }
    .pricing-grid { grid-template-columns: 1fr; }
    .footer-inner { flex-direction: column; gap: 32px; }
    .footer-links { flex-direction: column; gap: 24px; }
    .header-nav { gap: 12px; }
    .header-nav a { font-size: 13px; }
    .export-btn-group { flex-wrap: wrap; }
    .paywall-modal { padding: 28px 20px 20px; }
    .btn-upgrade-header { padding: 5px 10px; font-size: 12px; }
}