:root {
    --bg: #f5f7fb;
    --card: #ffffff;
    --text: #172033;
    --muted: #6b7280;
    --border: #e5e7eb;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --danger: #dc2626;
    --success-bg: #ecfdf5;
    --success-text: #047857;
    --error-bg: #fef2f2;
    --error-text: #b91c1c;
    --shadow: 0 8px 30px rgba(15, 23, 42, .07);
}

* { box-sizing: border-box; }
body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
a { color: inherit; }
.container { width: min(1120px, calc(100% - 32px)); margin: auto; }

.topbar {
    background: #fff;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}
.nav {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}
.brand { text-decoration: none; font-weight: 800; font-size: 18px; }
nav { display: flex; gap: 18px; align-items: center; }
nav a { text-decoration: none; color: #4b5563; font-size: 14px; }
nav a:hover, nav a.active { color: var(--primary); }
.login { font-weight: 700; }

main { padding: 36px 0 60px; }
.hero {
    display: flex; justify-content: space-between; align-items: center; gap: 20px;
    margin-bottom: 24px;
}
.hero h1, .card h1 { margin: 0 0 8px; font-size: 30px; letter-spacing: -.5px; }
.hero p { margin: 0; color: var(--muted); }

.card, .link-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: var(--shadow);
}
.card { padding: 24px; }
.narrow { max-width: 460px; margin: 30px auto; }

.alert { padding: 13px 16px; border-radius: 10px; margin-bottom: 20px; font-size: 14px; }
.alert.success { background: var(--success-bg); color: var(--success-text); }
.alert.error { background: var(--error-bg); color: var(--error-text); }

.muted { color: var(--muted); font-size: 14px; }
label { display: block; font-weight: 650; font-size: 14px; }
input, select {
    width: 100%; margin-top: 8px; padding: 12px 13px;
    border: 1px solid #d1d5db; border-radius: 10px; background: #fff;
    font: inherit; outline: none;
}
input:focus, select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,.1); }

.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 7px;
    border: 1px solid #d1d5db; background: #fff; color: var(--text);
    padding: 10px 15px; border-radius: 10px; text-decoration: none;
    font-weight: 700; cursor: pointer; font-size: 14px;
}
.btn:hover { background: #f9fafb; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-dark); }
.btn.danger { color: var(--danger); border-color: #fecaca; }
.btn.small { padding: 7px 10px; font-size: 12px; }

.section-head { display: flex; justify-content: space-between; gap: 20px; align-items: flex-start; margin-bottom: 22px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-grid .full { grid-column: 1 / -1; }
.actions { display: flex; gap: 10px; }

.filters { margin-bottom: 24px; }
.filter-form { display: grid; grid-template-columns: 1fr 220px auto; gap: 10px; }
.filter-form input, .filter-form select { margin: 0; }
.sorts { display: flex; align-items: center; gap: 14px; margin-top: 16px; font-size: 14px; }
.sorts a { text-decoration: none; color: var(--muted); }
.sorts a.active { color: var(--primary); font-weight: 800; }

.link-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}
.link-card { padding: 20px; min-width: 0; }
.link-top { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.badge {
    display: inline-flex; padding: 5px 9px; border-radius: 999px;
    background: #eff6ff; color: #1d4ed8; font-size: 12px; font-weight: 800;
}
.link-card h2 { font-size: 18px; margin: 16px 0 8px; }
.url {
    color: var(--muted); font-size: 12px; overflow: hidden;
    text-overflow: ellipsis; white-space: nowrap; margin-bottom: 18px;
}
.open-link { color: var(--primary); text-decoration: none; font-weight: 800; font-size: 14px; }
.mini-actions { display: flex; gap: 8px; align-items: center; font-size: 12px; }
.mini-actions a { color: var(--primary); text-decoration: none; }
.mini-actions form { display: inline; }
.mini-actions button { border: 0; padding: 0; background: none; color: var(--danger); cursor: pointer; font: inherit; }

.inline-form { display: flex; gap: 10px; margin-bottom: 22px; }
.inline-form input { margin: 0; flex: 1; }
.category-list { display: grid; gap: 8px; }
.category-row {
    display: flex; justify-content: space-between; align-items: center;
    padding: 14px 0; border-top: 1px solid var(--border);
}
.category-row .muted { margin-left: 8px; }

.empty { grid-column: 1 / -1; text-align: center; padding: 50px 20px; }
.empty h2 { margin-top: 0; }
.footer { border-top: 1px solid var(--border); padding: 20px 0; color: var(--muted); font-size: 12px; }

@media (max-width: 850px) {
    .link-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 650px) {
    .nav, .hero, .section-head { align-items: flex-start; flex-direction: column; }
    nav { flex-wrap: wrap; gap: 10px 14px; }
    .form-grid, .filter-form, .link-grid { grid-template-columns: 1fr; }
    .form-grid .full { grid-column: auto; }
    .inline-form { flex-direction: column; }
}