:root {
    --bg: #f7f7f8;
    --panel: #ffffff;
    --border: #e7e7ea;
    --text: #171717;
    --muted: #6b7280;
    --primary: #111827;
    --primary-soft: #f3f4f6;
    --accent: #0f766e;
    --danger: #b91c1c;
    --danger-soft: #fee2e2;
    --shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
    --radius: 16px;
    --radius-sm: 12px;
}

* {
    box-sizing: border-box;
}

html, body {
    max-width: 100%;
    overflow-x: hidden;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 40;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.topbar-inner {
    max-width: 1120px;
    margin: 0 auto;
    padding: 14px 22px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

@media (max-width: 1000px) {
    .topbar-inner {
        padding: 10px 14px;
        width: 100%;
    }

    .page {
        padding: 0 14px 40px;
        margin: 16px auto;
        overflow-x: hidden;
    }
}

.brand {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.nav {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.nav a,
.nav button {
    border: 1px solid transparent;
    background: transparent;
    color: var(--text);
    text-decoration: none;
    padding: 10px 14px;
    border-radius: 999px;
    font-size: 14px;
    cursor: pointer;
}

.nav a:hover,
.nav button:hover {
    background: var(--primary-soft);
}

.nav .active {
    background: var(--primary);
    color: white;
}

.nav .danger-link {
    background: var(--danger-soft);
    color: var(--danger);
    border-color: #fecaca;
}

.nav .danger-link:hover {
    background: #fecaca;
}

.logout-form {
    margin: 0;
}

/* ── Hamburger nav toggle (mobile only) ── */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 22px;
    cursor: pointer;
    padding: 6px 10px;
    border-radius: 10px;
    color: var(--text);
    line-height: 1;
}

.nav-toggle:hover {
    background: var(--primary-soft);
}

@media (max-width: 600px) {
    .topbar-inner {
        flex-wrap: wrap;
        gap: 0;
    }

    .nav-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .nav {
        display: none;
        flex-direction: column;
        align-items: stretch;
        flex-basis: 100%;
        gap: 2px;
        padding: 6px 0 10px;
    }

    .nav.nav-open {
        display: flex;
    }

    .nav a,
    .nav button {
        border-radius: 10px;
        text-align: left;
        justify-content: flex-start;
        padding: 12px 14px;
    }

    .logout-form {
        width: 100%;
    }

    .logout-form button {
        width: 100%;
        text-align: left;
        justify-content: flex-start;
    }
}

.page {
    max-width: 1120px;
    margin: 28px auto;
    padding: 0 22px 40px;
}

.panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.panel-header {
    padding: 20px 22px 10px;
}

.panel-body {
    padding: 22px;
}

h1, h2, h3 {
    margin: 0 0 10px;
    letter-spacing: -0.02em;
}

p {
    margin-top: 0;
    line-height: 1.5;
}

.muted {
    color: var(--muted);
}

.messages {
    list-style: none;
    padding: 0;
    margin: 0 0 18px;
}

.messages li {
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px 14px;
    margin-bottom: 10px;
}

.grid-2 {
    display: grid;
    grid-template-columns: minmax(0, 1.7fr) minmax(280px, 0.9fr);
    gap: 20px;
}

@media (max-width: 900px) {
    .grid-2 {
        grid-template-columns: 1fr;
    }
}

a {
    color: #0f172a;
}

input, textarea, button {
    font: inherit;
}

input[type="text"],
input[type="url"],
textarea,
input[type="email"],
input[type="password"] {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px 14px;
    background: white;
}

textarea {
    resize: vertical;
}

button,
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid transparent;
    background: var(--primary);
    color: white;
    padding: 11px 16px;
    border-radius: 12px;
    text-decoration: none;
    cursor: pointer;
}

button:hover,
.btn:hover {
    opacity: 0.94;
}

.btn-secondary {
    background: white;
    color: var(--text);
    border-color: var(--border);
}

.btn-danger {
    background: white;
    color: var(--danger);
    border-color: #fecaca;
}

.stack {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.list-clean {
    list-style: none;
    padding: 0;
    margin: 0;
}

.list-clean li + li {
    margin-top: 12px;
}

.item-card {
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 16px;
    background: #fff;
}

.meta {
    font-size: 13px;
    color: var(--muted);
}

.section-title-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
}

.mono {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}