:root {
    --bg: #0f172a;
    --bg-alt: #111c33;
    --surface: #16213e;
    --border: #223154;
    --text: #e6ebf5;
    --muted: #93a0bb;
    --primary: #4f8cff;
    --primary-hover: #3b76ea;
    --danger: #ef4444;
    --success: #22c55e;
    --radius: 12px;
}

* {
    box-sizing: border-box;
}

html, body {
    height: 100%;
}

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

.app-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.9rem 1.25rem;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.topbar-brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 600;
}

.brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: var(--primary);
    color: #fff;
    font-weight: 700;
}

.topbar-actions {
    display: flex;
    gap: 0.5rem;
}

.toolbar {
    display: flex;
    align-items: center;
    padding: 0.6rem 1.25rem;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: relative;
}

/* Needed: [hidden] alone loses to the .toolbar display:flex rule above. */
.toolbar[hidden] {
    display: none;
}

.toolbar-toggle {
    display: none;
    align-items: center;
    gap: 0.5rem;
    font: inherit;
    background: none;
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.4rem 0.8rem;
    border-radius: 8px;
    cursor: pointer;
}

.toolbar-menu {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.5rem;
    flex: 1;
    flex-wrap: wrap;
}

.btn-toolbar {
    background: transparent;
}

.btn-toolbar:hover {
    background: rgba(255, 255, 255, 0.06);
}

@media (max-width: 640px) {
    .toolbar-toggle {
        display: inline-flex;
    }

    .toolbar-menu {
        display: none;
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        position: absolute;
        top: 100%;
        left: 0.75rem;
        right: 0.75rem;
        margin-top: 0.4rem;
        padding: 0.6rem;
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        z-index: 20;
    }

    .toolbar-menu.is-open {
        display: flex;
    }
}

.btn {
    font: inherit;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text);
    padding: 0.55rem 1.1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease;
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.06);
}

.btn-primary {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
    width: 100%;
    margin-top: 0.4rem;
}

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

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.app-main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.auth-view {
    width: 100%;
    display: flex;
    justify-content: center;
}

/* Needed: [hidden] alone loses to the .auth-view display:flex rule above. */
.auth-view[hidden] {
    display: none;
}

.auth-card {
    width: 100%;
    max-width: 380px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.auth-tabs {
    display: flex;
    gap: 0.4rem;
    margin-bottom: 1.1rem;
    border-bottom: 1px solid var(--border);
}

.auth-tab {
    flex: 1;
    background: none;
    border: none;
    color: var(--muted);
    font: inherit;
    font-weight: 600;
    padding: 0.6rem 0;
    cursor: pointer;
    border-bottom: 2px solid transparent;
}

.auth-tab.is-active {
    color: var(--text);
    border-bottom-color: var(--primary);
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
}

/* Needed: [hidden] alone loses to the .auth-form display:flex rule above. */
.auth-form[hidden] {
    display: none;
}

.auth-form label {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    font-size: 0.85rem;
    color: var(--muted);
}

.auth-form input {
    font: inherit;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.6rem 0.7rem;
    border-radius: 8px;
}

.auth-form input:focus {
    outline: none;
    border-color: var(--primary);
}

.alert {
    margin-bottom: 1rem;
    padding: 0.65rem 0.8rem;
    border-radius: 8px;
    font-size: 0.9rem;
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(239, 68, 68, 0.4);
    color: #fecaca;
}

.alert.success {
    background: rgba(34, 197, 94, 0.12);
    border-color: rgba(34, 197, 94, 0.4);
    color: #bbf7d0;
}

.dashboard-view {
    max-width: 640px;
    width: 100%;
}

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

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    z-index: 50;
}

/* Needed: [hidden] alone loses to the .modal-overlay display:flex rule above. */
.modal-overlay[hidden] {
    display: none;
}

.modal-card {
    width: 100%;
    max-width: 640px;
    max-height: 80vh;
    overflow: auto;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
}

.panel-header h2 {
    margin: 0;
    font-size: 1.1rem;
}

.users-table-wrap {
    overflow-x: auto;
}

.users-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.users-table th,
.users-table td {
    text-align: left;
    padding: 0.55rem 0.6rem;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}

.users-table select {
    font: inherit;
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.3rem 0.5rem;
}

.users-table select:disabled {
    opacity: 0.6;
}

.btn-save-role {
    padding: 0.35rem 0.75rem;
    font-size: 0.85rem;
}