:root {
    --bg: #F6F7FB;
    --surface: #FFFFFF;
    --ink: #12151C;
    --muted: #5B6472;
    --primary: #1F3C88;
    --primary-dark: #142A63;
    --accent: #14B8A6;
    --accent-warm: #F2994A;
    --border: #E4E7EC;
    --radius: 14px;
    --shadow: 0 1px 2px rgba(18,21,28,.04), 0 8px 24px rgba(18,21,28,.06);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: 'Inter', -apple-system, sans-serif;
    line-height: 1.55;
    overflow-x: hidden;
}
h1, h2, h3, .brand, .btn, nav a {
    font-family: 'Poppins', 'Inter', sans-serif;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* Header */
header.site-header {
    position: sticky; top: 0; z-index: 20;
    background: rgba(246,247,251,.85);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
}
.header-row { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 12px; }
.brand { font-weight: 700; font-size: 20px; color: var(--primary-dark); flex-shrink: 0; }
.brand span { color: var(--accent); }
nav.main-nav { display: flex; align-items: center; gap: 28px; }
nav.main-nav a { font-size: 15px; font-weight: 500; color: var(--muted); }
nav.main-nav a:hover { color: var(--ink); }
.nav-toggle {
    display: none; background: none; border: 1px solid var(--border); border-radius: 8px;
    width: 40px; height: 40px; cursor: pointer; flex-shrink: 0;
    align-items: center; justify-content: center;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
    display: block; width: 18px; height: 2px; background: var(--ink); position: relative; transition: transform .2s;
}
.nav-toggle span::before, .nav-toggle span::after { content: ''; position: absolute; left: 0; }
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 11px 22px; border-radius: 10px; font-weight: 600; font-size: 15px;
    border: none; cursor: pointer;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: transparent; color: var(--primary-dark); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--primary); }
.btn-sm { padding: 8px 16px; font-size: 14px; }

/* Hero */
.hero { padding: 56px 0 48px; }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
.hero h1 {
    font-size: 44px; line-height: 1.15; font-weight: 700; margin: 0 0 20px;
    color: var(--primary-dark); max-width: 15ch;
}
.hero p.lead { font-size: 18px; color: var(--muted); max-width: 46ch; margin: 0 0 28px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.stats-row { display: flex; gap: 36px; margin-top: 44px; flex-wrap: wrap; }
.stat-num { font-size: 30px; font-weight: 700; color: var(--primary-dark); font-family: 'Poppins', sans-serif; }
.stat-label { font-size: 14px; color: var(--muted); }

/* Hero visual: stacked browser-mockup cards */
.hero-visual { position: relative; height: 320px; }
.mockup-stack { position: absolute; inset: 0; }
.mockup-card {
    position: absolute; width: 78%; border-radius: 12px; overflow: hidden;
    background: var(--surface); box-shadow: var(--shadow); border: 1px solid var(--border);
}
.mockup-card:nth-child(1) { top: 0; left: 0; transform: rotate(-4deg); z-index: 1; }
.mockup-card:nth-child(2) { top: 40px; left: 22%; transform: rotate(3deg); z-index: 2; }
.mockup-bar { display: flex; gap: 6px; padding: 10px 12px; background: #EEF0F4; }
.mockup-bar span { width: 8px; height: 8px; border-radius: 50%; background: #C7CCD6; }
.mockup-body { height: 150px; background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%); }

/* Filter tabs */
.section { padding: 40px 0; }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 28px; flex-wrap: wrap; gap: 16px; }
.section-head h2 { font-size: 28px; margin: 0; color: var(--primary-dark); }
.filter-tabs {
    display: flex; gap: 8px; overflow-x: auto; max-width: 100%;
    -webkit-overflow-scrolling: touch; scrollbar-width: none; padding-bottom: 2px;
}
.filter-tabs::-webkit-scrollbar { display: none; }
.filter-tabs a {
    padding: 8px 16px; border-radius: 999px; font-size: 14px; font-weight: 600;
    color: var(--muted); border: 1px solid var(--border); background: var(--surface);
    white-space: nowrap; flex-shrink: 0;
}
.filter-tabs a.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* Portfolio grid */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.card {
    background: var(--surface); border-radius: var(--radius); overflow: hidden;
    border: 1px solid var(--border); display: flex; flex-direction: column;
    border-left: 3px solid var(--accent);
}
.card[data-category="redesign"] { border-left-color: var(--accent-warm); }
.card[data-category="demo"] { border-left-color: var(--primary); }
.browser-frame { background: #EEF0F4; }
.browser-frame .mockup-bar { background: #E2E5EC; }
.thumb-wrap { aspect-ratio: 16/10; background: #E9EBF0; overflow: hidden; }
.thumb-wrap img { width: 100%; height: 100%; object-fit: cover; }
.thumb-placeholder {
    width: 100%; height: 100%; display: flex; align-items: center; justify-content: center;
    color: var(--muted); font-size: 13px; background: repeating-linear-gradient(135deg, #EDEFF3 0 12px, #E6E8EE 12px 24px);
}
.card-body { padding: 18px 20px 20px; flex: 1; display: flex; flex-direction: column; }
.badge {
    align-self: flex-start; font-size: 12px; font-weight: 600; padding: 3px 10px; border-radius: 999px;
    background: #E7F7F5; color: #0E7C6F; margin-bottom: 10px;
}
.card[data-category="redesign"] .badge { background: #FDEEE0; color: #B4650C; }
.card[data-category="demo"] .badge { background: #E9EEFB; color: var(--primary-dark); }
.card h3 { font-size: 17px; margin: 0 0 8px; }
.card p { font-size: 14px; color: var(--muted); margin: 0 0 16px; flex: 1; }
.card-links { display: flex; gap: 10px; }
.card-links a { font-size: 14px; font-weight: 600; color: var(--primary); }
.card-links a:hover { text-decoration: underline; }
.empty-state { text-align: center; padding: 60px 20px; color: var(--muted); }

/* Footer */
footer { border-top: 1px solid var(--border); padding: 32px 0; margin-top: 40px; }
.footer-row { display: flex; justify-content: space-between; align-items: center; font-size: 14px; color: var(--muted); flex-wrap: wrap; gap: 12px; }
.footer-row a { color: var(--muted); }
.footer-row a:hover { color: var(--primary-dark); }

@media (max-width: 1024px) {
    .container { padding: 0 20px; }
    .grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 860px) {
    .hero-grid { grid-template-columns: 1fr; }
    .hero-visual { display: none; }
    nav.main-nav {
        position: absolute; top: 100%; left: 0; right: 0; background: var(--surface);
        border-bottom: 1px solid var(--border); flex-direction: column; align-items: stretch;
        gap: 0; padding: 8px 20px 16px; display: none; box-shadow: var(--shadow);
    }
    nav.main-nav.open { display: flex; }
    nav.main-nav a:not(.btn) { padding: 12px 0; border-bottom: 1px solid var(--border); }
    nav.main-nav a.btn { margin-top: 12px; width: 100%; }
    .nav-toggle { display: inline-flex; }
    header.site-header { position: sticky; }
}
@media (max-width: 640px) {
    .container { padding: 0 16px; }
    .hero { padding: 40px 0 36px; }
    .hero h1 { font-size: 32px; max-width: none; }
    .hero p.lead { font-size: 16px; }
    .hero-actions .btn { flex: 1 1 auto; text-align: center; }
    .stats-row { gap: 20px 32px; }
    .section { padding: 32px 0; }
    .section-head h2 { font-size: 22px; }
    .grid { grid-template-columns: 1fr; gap: 18px; }
    .card-body { padding: 16px; }
}
@media (max-width: 400px) {
    .hero h1 { font-size: 27px; }
    .stat-num { font-size: 24px; }
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { width: 100%; }
}

/* Admin */
.admin-shell { max-width: 880px; margin: 40px auto; padding: 0 20px; }
.admin-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); }
.admin-card h1 { font-size: 22px; margin-top: 0; }
.form-row { margin-bottom: 16px; }
.form-row label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; }
.form-row input[type=text], .form-row input[type=url], .form-row input[type=password], .form-row input[type=file], .form-row textarea, .form-row select {
    width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font-family: inherit; font-size: 14px;
}
.form-row textarea { min-height: 80px; resize: vertical; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.alert { padding: 12px 16px; border-radius: 8px; font-size: 14px; margin-bottom: 20px; }
.alert-success { background: #E7F7F5; color: #0E7C6F; }
.alert-error { background: #FDECEC; color: #C0392B; }
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; margin-top: 24px; }
table.admin-table { width: 100%; min-width: 480px; border-collapse: collapse; }
table.admin-table th, table.admin-table td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--border); font-size: 14px; white-space: nowrap; }
table.admin-table td:nth-child(1) { white-space: normal; }
table.admin-table th { color: var(--muted); font-weight: 600; }
.row-actions a { font-size: 13px; font-weight: 600; margin-right: 12px; }
.row-actions a.danger { color: #C0392B; }
.top-bar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; gap: 12px; flex-wrap: wrap; }
.top-bar > div { display: flex; gap: 8px; flex-wrap: wrap; }

@media (max-width: 640px) {
    .admin-shell { margin: 24px auto; padding: 0 14px; }
    .admin-card { padding: 18px; }
    .form-grid { grid-template-columns: 1fr; gap: 0; }
    .top-bar h1 { font-size: 20px; }
}