:root {
    --bg: #0b0f14;
    --panel: #121923;
    --panel-soft: #18212e;
    --border: #273447;
    --text: #dce3ec;
    --muted: #8fa2b8;
    --accent: #33b5ff;
    --accent-soft: rgba(51, 181, 255, 0.18);
    --success: #4bd37b;
    --error: #ff6b7a;
    --shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: 'Segoe UI', Tahoma, sans-serif;
    background: radial-gradient(circle at 20% 0%, #101826 0%, var(--bg) 45%);
    color: var(--text);
}

.app-shell {
    max-width: 1100px;
    margin: 24px auto;
    padding: 0 18px 24px;
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 18px;
}

.app-title {
    margin: 0;
    font-size: 1.6rem;
    letter-spacing: 0.02em;
}

.app-subtitle {
    margin: 4px 0 0;
    color: var(--muted);
    font-size: 0.95rem;
}

.tab-list {
    display: grid;
    grid-template-columns: repeat(4, minmax(110px, 1fr));
    gap: 8px;
    margin-bottom: 14px;
}

.tab-button {
    background: var(--panel);
    border: 1px solid var(--border);
    color: var(--muted);
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.tab-button:hover {
    color: var(--text);
    border-color: #396089;
}

.tab-button.is-active {
    color: var(--text);
    border-color: var(--accent);
    background: linear-gradient(180deg, var(--accent-soft) 0%, rgba(51, 181, 255, 0.08) 100%);
}

.tab-panel {
    display: none;
}

.tab-panel.is-active {
    display: block;
}

.card {
    background: linear-gradient(180deg, var(--panel) 0%, #101720 100%);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    box-shadow: var(--shadow);
}

.section-title {
    margin: 0 0 12px;
    font-size: 1.1rem;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 10px;
}

label {
    display: grid;
    gap: 6px;
    color: var(--muted);
    font-size: 0.9rem;
}

input,
select,
button {
    border-radius: 8px;
    border: 1px solid var(--border);
    padding: 10px;
    font: inherit;
}

input,
select {
    background: var(--panel-soft);
    color: var(--text);
}

button {
    background: #1f2a3b;
    color: var(--text);
    cursor: pointer;
}

button:hover {
    border-color: #4f6d91;
}

.button-primary {
    background: linear-gradient(180deg, #1a70a1 0%, #14557a 100%);
    border-color: #2f88bc;
}

.inline-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 8px;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    border: 1px solid var(--border);
    padding: 10px;
    text-align: left;
}

th {
    color: #a9bfd7;
    background: #1a2432;
    font-weight: 600;
}

tbody tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.02);
}

.error {
    color: var(--error);
    min-height: 20px;
    margin-top: 10px;
}

.status {
    color: var(--success);
    min-height: 20px;
    margin-top: 6px;
}

@media (max-width: 768px) {
    .tab-list {
        grid-template-columns: repeat(2, minmax(120px, 1fr));
    }
}