/* ===== Design tokens ===== */
:root {
    --bg: #f6f7fb;
    --surface: #ffffff;
    --text: #0f172a;
    --muted: #64748b;
    --border: #e6e8f0;
    --primary: #6d5efc;
    --primary-2: #9b8bff;
    --primary-dark: #5a4be0;
    --accent: #14b8a6;
    --shadow-sm: 0 2px 8px rgba(15, 23, 42, .06);
    --shadow-md: 0 10px 30px rgba(15, 23, 42, .10);
    --shadow-lg: 0 24px 60px rgba(79, 70, 229, .18);
    --radius: 16px;
    --radius-sm: 10px;
    --font: "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
    --font-display: "Space Grotesk", var(--font);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container {
    width: 100%;
    max-width: 1160px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: var(--font);
    font-weight: 600;
    font-size: 15px;
    padding: 11px 20px;
    border-radius: 12px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform .15s ease, box-shadow .2s ease, background .2s ease, color .2s ease;
    white-space: nowrap;
}
.btn:active { transform: translateY(1px) scale(.99); }
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-2));
    color: #fff;
    box-shadow: 0 8px 20px rgba(109, 94, 252, .35);
}
.btn-primary:hover { box-shadow: 0 12px 26px rgba(109, 94, 252, .45); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--text); }
.btn-ghost:hover { background: rgba(15, 23, 42, .05); }
.btn-outline { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: rgba(109, 94, 252, .08); }
.btn-light { background: #fff; color: var(--primary); box-shadow: var(--shadow-md); }
.btn-light:hover { transform: translateY(-1px); }
.btn-lg { padding: 15px 30px; font-size: 16px; border-radius: 14px; }
.btn-block { width: 100%; }

/* ===== Header ===== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, .8);
    backdrop-filter: saturate(180%) blur(14px);
    border-bottom: 1px solid transparent;
    transition: border-color .2s, box-shadow .2s;
}
.site-header.scrolled { border-color: var(--border); box-shadow: var(--shadow-sm); }
.header-inner {
    display: flex;
    align-items: center;
    gap: 20px;
    height: 70px;
}
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; }
.logo-mark {
    display: grid;
    place-items: center;
    width: 40px; height: 40px;
    border-radius: 12px;
    color: #fff;
    background: linear-gradient(135deg, var(--primary), var(--primary-2));
    box-shadow: 0 6px 16px rgba(109, 94, 252, .4);
}
.logo-text { font-family: var(--font-display); font-size: 20px; letter-spacing: -.5px; }
.logo-text span { color: var(--primary); }

.main-nav { display: flex; gap: 28px; margin-left: 18px; }
.main-nav a { color: var(--muted); font-weight: 500; font-size: 15px; transition: color .15s; }
.main-nav a:hover { color: var(--text); }

.header-actions { display: flex; align-items: center; gap: 10px; margin-left: auto; }

/* Language select */
.lang-select { position: relative; }
.lang-btn {
    display: inline-flex; align-items: center; gap: 6px;
    background: transparent; border: 1px solid var(--border);
    border-radius: 10px; padding: 8px 10px; cursor: pointer;
    font-family: var(--font); font-weight: 600; font-size: 14px; color: var(--text);
    transition: background .15s, border-color .15s;
}
.lang-btn:hover { background: rgba(15,23,42,.04); }
.lang-btn .chev { transition: transform .2s; }
.lang-select.open .lang-btn .chev { transform: rotate(180deg); }
.lang-menu {
    position: absolute; right: 0; top: calc(100% + 8px);
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 12px; box-shadow: var(--shadow-md);
    padding: 6px; min-width: 170px;
    opacity: 0; visibility: hidden; transform: translateY(-6px);
    transition: opacity .15s, transform .15s, visibility .15s;
    z-index: 50;
}
.lang-select.open .lang-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.lang-menu button {
    display: block; width: 100%; text-align: left;
    background: transparent; border: none; cursor: pointer;
    padding: 9px 12px; border-radius: 8px; font-family: var(--font);
    font-size: 14px; color: var(--text);
}
.lang-menu button:hover { background: rgba(109,94,252,.1); }
.lang-menu button.active { background: rgba(109,94,252,.14); color: var(--primary); font-weight: 700; }

.account-chip {
    display: inline-flex; align-items: center; gap: 8px;
    background: var(--surface); border: 1px solid var(--border);
    padding: 5px 12px 5px 5px; border-radius: 999px; cursor: pointer;
    font-family: var(--font); font-weight: 600; font-size: 14px;
    transition: box-shadow .15s;
}
.account-chip:hover { box-shadow: var(--shadow-sm); }
.avatar {
    display: grid; place-items: center;
    width: 28px; height: 28px; border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff; font-weight: 700; font-size: 13px;
}
.avatar-lg { width: 54px; height: 54px; font-size: 22px; }

.burger { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
.burger span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: .2s; }

/* ===== Hero ===== */
.hero { position: relative; overflow: hidden; padding: 70px 0 60px; }
.hero-bg {
    position: absolute; inset: 0; z-index: 0;
    background:
        radial-gradient(60% 60% at 20% 0%, rgba(109,94,252,.16), transparent 60%),
        radial-gradient(50% 50% at 90% 10%, rgba(20,184,166,.14), transparent 60%);
}
.hero-inner { position: relative; z-index: 1; text-align: center; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    background: var(--surface); border: 1px solid var(--border);
    padding: 7px 14px; border-radius: 999px; font-size: 13px; font-weight: 600;
    color: var(--muted); box-shadow: var(--shadow-sm);
}
.hero-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px rgba(20,184,166,.2); }
.hero-title {
    font-family: var(--font-display);
    font-size: clamp(32px, 6vw, 58px);
    line-height: 1.05; letter-spacing: -1.5px;
    margin: 22px auto 16px; max-width: 780px;
    background: linear-gradient(135deg, #0f172a 30%, #6d5efc);
    -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-subtitle { color: var(--muted); font-size: clamp(16px, 2.4vw, 19px); max-width: 620px; margin: 0 auto 36px; }

/* Live activity panel */
.activity-panel {
    max-width: 720px;
    margin: 0 auto 22px;
    padding: 16px 20px;
    background: rgba(255, 255, 255, .88);
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: var(--shadow-sm);
    text-align: left;
}
.activity-top {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
    font-size: 14px;
    color: var(--muted);
}
.activity-pulse {
    flex-shrink: 0;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #22c55e;
    box-shadow: 0 0 0 0 rgba(34, 197, 94, .55);
    animation: pulseDot 2s ease infinite;
}
@keyframes pulseDot {
    0% { box-shadow: 0 0 0 0 rgba(34, 197, 94, .55); }
    70% { box-shadow: 0 0 0 10px rgba(34, 197, 94, 0); }
    100% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0); }
}
.activity-text strong {
    color: var(--text);
    font-family: var(--font-display);
    font-size: 17px;
    margin: 0 5px;
    transition: color .3s;
}
.activity-load { display: grid; gap: 8px; }
.load-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    font-weight: 600;
    color: var(--muted);
}
.load-pct {
    color: var(--text);
    font-family: var(--font-display);
    font-size: 15px;
}
.load-bar {
    height: 12px;
    border-radius: 999px;
    background: #e8ebf3;
    padding: 2px;
    box-shadow: inset 0 1px 3px rgba(15, 23, 42, .08);
    overflow: hidden;
}
.load-fill {
    height: 100%;
    width: 87%;
    border-radius: 999px;
    background: linear-gradient(90deg, #22c55e 0%, #eab308 52%, #ef4444 100%);
    box-shadow: 0 1px 4px rgba(239, 68, 68, .25);
    transition: width 1.2s cubic-bezier(.4, 0, .2, 1);
}
.load-status {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .3px;
    color: #d97706;
    text-transform: uppercase;
}

/* Converter card */
.converter-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 14px;
    max-width: 720px;
    margin: 0 auto;
    box-shadow: var(--shadow-lg);
}
.dropzone {
    border: 2px dashed #cfd3e6;
    border-radius: 18px;
    padding: 48px 24px;
    text-align: center;
    transition: border-color .2s, background .2s;
    background: linear-gradient(180deg, rgba(109,94,252,.03), transparent);
}
.dropzone.dragover { border-color: var(--primary); background: rgba(109,94,252,.06); }
.dropzone-icon {
    display: grid; place-items: center;
    width: 76px; height: 76px; margin: 0 auto 16px;
    border-radius: 20px; color: var(--primary);
    background: rgba(109,94,252,.1);
}
.dropzone h3 { font-size: 20px; font-family: var(--font-display); }
.dropzone p { color: var(--muted); margin: 4px 0 18px; }
.dropzone-note { font-size: 13px; margin-top: 16px; margin-bottom: 0; }

.convert-row {
    display: flex; align-items: center; justify-content: space-between;
    flex-wrap: wrap; gap: 14px; padding: 18px 12px 8px;
}
.file-pill {
    display: inline-flex; align-items: center; gap: 8px;
    background: rgba(109,94,252,.08); color: var(--primary);
    padding: 8px 14px; border-radius: 10px; font-weight: 600; max-width: 100%;
}
.file-pill span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 220px; }
.convert-controls { display: inline-flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.convert-controls > span { color: var(--muted); font-size: 14px; }
.format-select {
    font-family: var(--font); font-weight: 600; font-size: 14px;
    padding: 10px 14px; border-radius: 10px; border: 1px solid var(--border);
    background: var(--surface); cursor: pointer; color: var(--text);
}
.format-select:focus { outline: 2px solid var(--primary); outline-offset: 1px; }

.trust-row { display: flex; justify-content: center; gap: 28px; flex-wrap: wrap; margin-top: 30px; }
.trust-item { display: inline-flex; align-items: center; gap: 8px; color: var(--muted); font-size: 14px; font-weight: 500; }
.trust-item svg { color: var(--accent); }

/* ===== Stats ===== */
.stats { padding: 20px 0 10px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.stat { text-align: center; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px 12px; box-shadow: var(--shadow-sm); }
.stat-num { display: block; font-family: var(--font-display); font-size: clamp(24px, 4vw, 34px); font-weight: 700; color: var(--primary); }
.stat-label { color: var(--muted); font-size: 14px; }

/* ===== Sections ===== */
.section { padding: 80px 0; }
.section-alt { background: linear-gradient(180deg, #fff, #f2f3fb); }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 48px; }
.eyebrow { display: inline-block; color: var(--primary); font-weight: 700; font-size: 13px; letter-spacing: 1.2px; text-transform: uppercase; margin-bottom: 10px; }
.section-head h2 { font-family: var(--font-display); font-size: clamp(26px, 4vw, 40px); letter-spacing: -1px; }

/* Features */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feature-card {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 28px;
    transition: transform .2s, box-shadow .2s, border-color .2s;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: transparent; }
.feature-icon { display: grid; place-items: center; width: 52px; height: 52px; border-radius: 14px; margin-bottom: 16px; color: #fff; }
.i-blue { background: linear-gradient(135deg,#3b82f6,#60a5fa); }
.i-green { background: linear-gradient(135deg,#10b981,#34d399); }
.i-purple { background: linear-gradient(135deg,#8b5cf6,#a78bfa); }
.i-orange { background: linear-gradient(135deg,#f59e0b,#fbbf24); }
.i-pink { background: linear-gradient(135deg,#ec4899,#f472b6); }
.i-teal { background: linear-gradient(135deg,#14b8a6,#2dd4bf); }
.feature-card h3 { font-size: 19px; margin-bottom: 8px; font-family: var(--font-display); }
.feature-card p { color: var(--muted); font-size: 15px; }

/* Formats */
.format-cats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.fmt-card {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 26px; cursor: pointer;
    transition: transform .2s, box-shadow .2s;
}
.fmt-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.fmt-ic { font-size: 34px; margin-bottom: 12px; }
.fmt-card h4 { font-size: 18px; margin-bottom: 6px; font-family: var(--font-display); }
.fmt-card p { color: var(--muted); font-size: 14px; letter-spacing: .3px; }

/* Steps */
.steps { display: flex; align-items: stretch; justify-content: center; gap: 12px; flex-wrap: wrap; }
.step { flex: 1; min-width: 220px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px 26px; text-align: center; box-shadow: var(--shadow-sm); }
.step-num { display: grid; place-items: center; width: 48px; height: 48px; margin: 0 auto 16px; border-radius: 50%; background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; font-weight: 800; font-size: 20px; font-family: var(--font-display); }
.step h3 { font-size: 18px; margin-bottom: 8px; }
.step p { color: var(--muted); font-size: 15px; }
.step-arrow { display: grid; place-items: center; font-size: 28px; color: var(--primary); font-weight: 700; }

/* Pricing */
.price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: start; }
.price-card { position: relative; background: var(--surface); border: 1px solid var(--border); border-radius: 20px; padding: 32px 28px; box-shadow: var(--shadow-sm); }
.price-card.featured { border: 2px solid var(--primary); box-shadow: var(--shadow-lg); transform: translateY(-8px); }
.badge-pop { position: absolute; top: -13px; left: 50%; transform: translateX(-50%); background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; font-size: 12px; font-weight: 700; padding: 5px 14px; border-radius: 999px; }
.price-card h3 { font-family: var(--font-display); font-size: 22px; margin-bottom: 8px; }
.price { display: flex; align-items: baseline; gap: 4px; margin-bottom: 20px; }
.price .amount { font-family: var(--font-display); font-size: 40px; font-weight: 700; }
.price .per { color: var(--muted); font-size: 15px; }
.price-card ul { display: grid; gap: 12px; margin-bottom: 26px; }
.price-card li { position: relative; padding-left: 28px; color: var(--muted); }
.price-card li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--accent); font-weight: 800; }

/* CTA */
.cta { padding: 80px 0; }
.cta-inner { background: linear-gradient(135deg, var(--primary), #7c5cfc 60%, var(--accent)); border-radius: 28px; padding: 60px 40px; text-align: center; color: #fff; box-shadow: var(--shadow-lg); }
.cta h2 { font-family: var(--font-display); font-size: clamp(26px, 4vw, 40px); margin-bottom: 12px; }
.cta p { opacity: .92; font-size: 18px; margin-bottom: 30px; }

/* ===== Footer ===== */
.site-footer { background: #0f1424; color: #cbd2e3; padding: 60px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,.08); }
.footer-brand .logo { color: #fff; margin-bottom: 14px; }
.footer-brand p { color: #93a0bd; max-width: 280px; }
.footer-col h4 { color: #fff; font-size: 15px; margin-bottom: 16px; }
.footer-col a { display: block; color: #93a0bd; padding: 6px 0; transition: color .15s; }
.footer-col a:hover { color: #fff; }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; padding-top: 24px; color: #7c88a6; font-size: 14px; flex-wrap: wrap; gap: 14px; }
.socials { display: flex; gap: 12px; }
.socials a { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 10px; background: rgba(255,255,255,.06); color: #cbd2e3; transition: background .15s, color .15s; }
.socials a:hover { background: var(--primary); color: #fff; }

/* ===== Modals ===== */
[hidden] { display: none !important; }

.modal-overlay {
    position: fixed; inset: 0; z-index: 200;
    background: rgba(15, 23, 42, .55); backdrop-filter: blur(4px);
    display: flex; align-items: center; justify-content: center;
    padding: 20px; overflow-y: auto;
    animation: fadeIn .2s ease;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.modal {
    position: relative; background: var(--surface); border-radius: 22px;
    width: 100%; max-width: 420px; padding: 34px 30px;
    box-shadow: var(--shadow-lg); animation: popIn .25s cubic-bezier(.2,.9,.3,1.2);
    max-height: 92vh; overflow-y: auto;
}
.modal-wide { max-width: 560px; }
@keyframes popIn { from { opacity: 0; transform: translateY(16px) scale(.97); } to { opacity: 1; transform: none; } }
.modal-close { position: absolute; top: 14px; right: 16px; background: none; border: none; font-size: 28px; line-height: 1; color: var(--muted); cursor: pointer; transition: color .15s; }
.modal-close:hover { color: var(--text); }
.modal-head { text-align: center; margin-bottom: 22px; }
.modal-logo { display: grid; place-items: center; width: 56px; height: 56px; margin: 0 auto 14px; border-radius: 16px; color: #fff; background: linear-gradient(135deg, var(--primary), var(--primary-2)); box-shadow: 0 8px 20px rgba(109,94,252,.4); }
.modal-head h2 { font-family: var(--font-display); font-size: 24px; }
.modal-head p { color: var(--muted); font-size: 15px; margin-top: 4px; }

.auth-form { display: grid; gap: 16px; }
.auth-form label { display: grid; gap: 6px; font-size: 14px; font-weight: 600; color: var(--text); }
.auth-form input {
    font-family: var(--font); font-size: 15px; padding: 12px 14px;
    border: 1px solid var(--border); border-radius: 12px; background: #fbfbfe;
    transition: border-color .15s, box-shadow .15s;
}
.auth-form input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(109,94,252,.15); }
.form-error { background: rgba(239,68,68,.1); color: #dc2626; font-size: 13px; padding: 10px 12px; border-radius: 10px; }
.auth-switch { text-align: center; margin-top: 18px; color: var(--muted); font-size: 14px; }
.link { background: none; border: none; color: var(--primary); font-weight: 700; cursor: pointer; font-family: var(--font); font-size: 14px; }
.link:hover { text-decoration: underline; }

/* Verify */
.verify-body { text-align: center; }
.verify-icon { display: grid; place-items: center; width: 78px; height: 78px; margin: 0 auto 18px; border-radius: 20px; color: var(--accent); background: rgba(20,184,166,.12); }
.verify-body h2 { font-family: var(--font-display); font-size: 24px; margin-bottom: 8px; }
.verify-body p { color: var(--muted); }
.verify-email { font-weight: 700; color: var(--text) !important; margin: 6px 0 14px; }
.verify-hint { font-size: 14px; margin-bottom: 22px; }
.verify-body .btn { margin-bottom: 10px; }
.verify-note { font-size: 12px; margin-top: 8px; font-style: italic; }

/* Dashboard */
.dash-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 24px; }
.dash-user { display: flex; align-items: center; gap: 14px; }
.dash-user h2 { font-family: var(--font-display); font-size: 22px; }
.dash-email { color: var(--muted); font-size: 14px; }
.plan-tag { background: rgba(109,94,252,.1); color: var(--primary); font-weight: 700; font-size: 13px; padding: 7px 14px; border-radius: 999px; }
.dash-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-bottom: 26px; }
.dash-stat { background: #f6f7fb; border: 1px solid var(--border); border-radius: 14px; padding: 18px 12px; text-align: center; }
.ds-num { display: block; font-family: var(--font-display); font-size: 24px; font-weight: 700; color: var(--text); }
.ds-label { color: var(--muted); font-size: 13px; }
.dash-section { margin-bottom: 24px; }
.dash-section h3 { font-size: 16px; margin-bottom: 12px; }
.dash-empty { display: grid; place-items: center; gap: 10px; padding: 34px; border: 1px dashed var(--border); border-radius: 14px; color: var(--muted); }

/* Toast */
.toast {
    position: fixed; left: 50%; bottom: 30px; transform: translateX(-50%) translateY(20px);
    background: #0f172a; color: #fff; padding: 14px 22px; border-radius: 12px;
    box-shadow: var(--shadow-lg); z-index: 300; font-weight: 600; font-size: 14px;
    opacity: 0; transition: opacity .25s, transform .25s; max-width: 90vw;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 900px) {
    .feature-grid, .format-cats, .price-grid { grid-template-columns: repeat(2, 1fr); }
    .price-card.featured { transform: none; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
    .step-arrow { display: none; }
}
@media (max-width: 720px) {
    .main-nav { display: none; }
    .burger { display: flex; }
    .main-nav.open {
        display: flex; flex-direction: column; gap: 4px;
        position: absolute; top: 70px; left: 0; right: 0;
        background: var(--surface); border-bottom: 1px solid var(--border);
        padding: 12px 24px; box-shadow: var(--shadow-md); margin: 0;
    }
    .main-nav.open a { padding: 10px 0; }
    .header-actions .btn-ghost, .header-actions .btn-primary { display: none; }
    .header-actions.show-auth .btn-ghost, .header-actions.show-auth .btn-primary { display: inline-flex; }
}
@media (max-width: 560px) {
    .feature-grid, .format-cats, .price-grid, .stats-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .convert-row { flex-direction: column; align-items: stretch; }
    .convert-controls { justify-content: space-between; }
    .hero { padding: 40px 0; }
    .section { padding: 56px 0; }
}