:root {
    --bg: #f4f5f7;
    --card-bg: #ffffff;
    --text: #1f2430;
    --muted: #6b7280;
    --border: #e2e4e9;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success-bg: #dcfce7;
    --success-text: #166534;
    --error-bg: #fee2e2;
    --error-text: #991b1b;
    --neutral-bg: #eef0f3;
    --neutral-text: #4b5563;
}

* {
    box-sizing: border-box;
}

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

.page-center {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.topbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
}

.topbar-inner {
    max-width: 720px;
    margin: 0 auto;
    padding: 14px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
}

.brand {
    font-weight: 700;
    font-size: 18px;
}

.topbar nav a {
    color: var(--muted);
    text-decoration: none;
    margin-left: 16px;
    font-size: 14px;
}

.topbar nav a:first-child {
    margin-left: 0;
}

.topbar nav a.active,
.topbar nav a:hover {
    color: var(--primary);
}

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 20px 16px 60px;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
}

.auth-card {
    width: 100%;
    max-width: 360px;
}

h1 {
    font-size: 20px;
    margin-top: 0;
}

label {
    display: block;
    margin-bottom: 14px;
    font-size: 14px;
    color: var(--text);
}

input[type="text"],
input[type="password"],
input[type="file"],
textarea {
    width: 100%;
    margin-top: 6px;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    background: var(--card-bg);
    color: var(--text);
}

textarea {
    resize: vertical;
}

fieldset.platforms {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 14px;
    margin-bottom: 16px;
}

fieldset.platforms legend {
    font-size: 13px;
    color: var(--muted);
    padding: 0 6px;
}

label.checkbox {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    font-size: 14px;
}

label.checkbox input {
    width: auto;
}

.btn {
    display: inline-block;
    border: none;
    border-radius: 8px;
    padding: 10px 18px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-primary:disabled {
    background: var(--muted);
    cursor: not-allowed;
}

.btn-small {
    padding: 4px 10px;
    font-size: 12px;
    background: var(--neutral-bg);
    color: var(--text);
}

.alert {
    padding: 12px 14px;
    border-radius: 8px;
    margin-bottom: 16px;
    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: 13px;
}

.small {
    font-size: 12px;
}

.post-card-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 8px;
    flex-wrap: wrap;
}

.post-thumb {
    max-width: 100%;
    border-radius: 8px;
    margin: 10px 0;
}

.post-content {
    font-size: 14px;
    line-height: 1.5;
    white-space: pre-wrap;
}

.platform-status {
    margin-top: 12px;
    border-top: 1px solid var(--border);
    padding-top: 12px;
}

.platform-row {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 8px;
}

.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
}

.badge-success {
    background: var(--success-bg);
    color: var(--success-text);
}

.badge-error {
    background: var(--error-bg);
    color: var(--error-text);
}

.badge-neutral {
    background: var(--neutral-bg);
    color: var(--neutral-text);
}

.inline-form {
    display: inline;
}

@media (max-width: 480px) {
    .container {
        padding: 16px 12px 40px;
    }

    .card {
        padding: 16px;
    }
}