:root {
    --bg: #0b1220;
    --panel: #111a2e;
    --panel-2: #0f172a;
    --border: #24324a;
    --text: #e5e7eb;
    --muted: #94a3b8;
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --danger: #ef4444;
    --success: #22c55e;
    --radius: 18px;
    --radius-sm: 14px;
    --shadow: 0 20px 45px rgba(0, 0, 0, 0.28);
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    min-height: 100%;
    background: radial-gradient(circle at top, #111c33 0%, var(--bg) 45%);
    color: var(--text);
    font-family: Inter, "Segoe UI", Arial, sans-serif;
}

a {
    color: inherit;
    text-decoration: none;
}

.app-shell {
    display: grid;
    grid-template-columns: 280px 1fr;
    min-height: 100vh;
}

.sidebar {
    background: linear-gradient(180deg, #101a30 0%, #0f172a 100%);
    border-right: 1px solid rgba(36, 50, 74, 0.9);
    padding: 24px 18px;
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.brand {
    padding: 10px 12px 18px 12px;
    border-bottom: 1px solid rgba(36, 50, 74, 0.85);
}

.brand h1 {
    margin: 0;
    font-size: 1.3rem;
    letter-spacing: 0.2px;
    color: #93c5fd;
}

.brand p {
    margin: 8px 0 0 0;
    color: var(--muted);
    font-size: 0.92rem;
}

.nav-section {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 13px 14px;
    border-radius: 14px;
    color: var(--text);
    transition: 0.2s ease;
    border: 1px solid transparent;
}

.nav-link:hover {
    background: rgba(59, 130, 246, 0.12);
    border-color: rgba(59, 130, 246, 0.22);
}

.nav-link.active {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.95), rgba(37, 99, 235, 0.95));
    color: white;
    font-weight: 600;
    box-shadow: 0 12px 28px rgba(37, 99, 235, 0.35);
}

.sidebar-footer {
    margin-top: auto;
    border-top: 1px solid rgba(36, 50, 74, 0.85);
    padding-top: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    color: var(--muted);
    font-size: 0.92rem;
}

.main-area {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.topbar {
    height: 76px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 28px;
    background: rgba(15, 23, 42, 0.82);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(36, 50, 74, 0.8);
}

.topbar-left h2 {
    margin: 0;
    font-size: 1.08rem;
    font-weight: 600;
}

.topbar-left p {
    margin: 4px 0 0 0;
    color: var(--muted);
    font-size: 0.9rem;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 14px;
}

.user-pill {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 2px;
}

.user-pill strong {
    font-size: 0.95rem;
}

.user-pill span {
    color: var(--muted);
    font-size: 0.86rem;
}

.logout-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: 14px;
    padding: 11px 16px;
    background: rgba(239, 68, 68, 0.16);
    color: #fecaca;
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s ease;
}

.logout-btn:hover {
    background: rgba(239, 68, 68, 0.26);
}

.content {
    padding: 28px;
    overflow: auto;
}

.page-card {
    background: rgba(17, 26, 46, 0.82);
    border: 1px solid rgba(36, 50, 74, 0.9);
    border-radius: 24px;
    box-shadow: var(--shadow);
    padding: 24px;
}

.grid-cards {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
}

.metric-card {
    background: linear-gradient(180deg, rgba(17, 26, 46, 0.96), rgba(15, 23, 42, 0.96));
    border: 1px solid rgba(36, 50, 74, 0.9);
    border-radius: 20px;
    padding: 20px;
}

.metric-card .label {
    color: var(--muted);
    font-size: 0.92rem;
}

.metric-card .value {
    margin-top: 12px;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.section {
    margin-top: 22px;
    background: rgba(17, 26, 46, 0.82);
    border: 1px solid rgba(36, 50, 74, 0.9);
    border-radius: 20px;
    padding: 22px;
}

.section h3 {
    margin: 0 0 8px 0;
    font-size: 1.05rem;
}

.section p {
    margin: 0;
    color: var(--muted);
}

.form-input {
    width: 100%;
    background: #0f172a;
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 12px 14px;
    color: var(--text);
    outline: none;
}

.form-input:focus {
    border-color: rgba(59, 130, 246, 0.95);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.16);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border: 0;
    color: white;
    border-radius: 14px;
    padding: 12px 16px;
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s ease;
}

.btn-primary:hover {
    filter: brightness(1.06);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.14);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #fecaca;
    border-radius: 14px;
    padding: 12px 16px;
    font-weight: 600;
    cursor: pointer;
}

.auth-wrap {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}

.auth-card {
    width: 100%;
    max-width: 460px;
    background: rgba(17, 26, 46, 0.95);
    border: 1px solid rgba(36, 50, 74, 0.95);
    border-radius: 24px;
    box-shadow: var(--shadow);
    padding: 30px;
}

.auth-title {
    margin: 0 0 8px 0;
    font-size: 2rem;
    color: #93c5fd;
    text-align: center;
}

.auth-subtitle {
    margin: 0 0 24px 0;
    color: var(--muted);
    text-align: center;
    line-height: 1.5;
}

.auth-error {
    background: rgba(239, 68, 68, 0.14);
    border: 1px solid rgba(239, 68, 68, 0.25);
    color: #fecaca;
    padding: 12px 14px;
    border-radius: 14px;
    margin-bottom: 16px;
}

.auth-form label {
    display: block;
    margin: 0 0 8px 0;
    color: var(--muted);
    font-size: 0.92rem;
}

.auth-form .field {
    margin-bottom: 16px;
}

.auth-form input {
    width: 100%;
    background: #0f172a;
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 12px 14px;
    color: var(--text);
    outline: none;
}

.auth-form input:focus {
    border-color: rgba(59, 130, 246, 0.95);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.16);
}

.auth-form button {
    width: 100%;
    margin-top: 8px;
}

@media (max-width: 1100px) {
    .grid-cards {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .app-shell {
        grid-template-columns: 1fr;
    }

    .sidebar {
        display: none;
    }
}

@media (max-width: 640px) {
    .content {
        padding: 16px;
    }

    .topbar {
        padding: 0 16px;
        height: auto;
        min-height: 72px;
        gap: 12px;
        flex-direction: column;
        align-items: flex-start;
        justify-content: center;
    }

    .grid-cards {
        grid-template-columns: 1fr;
    }
}

.dashboard-open-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    background: linear-gradient(135deg, #3b82f6, #2563eb);

    color: white !important;
    text-decoration: none;

    padding: 6px 12px;
    height: 30px;

    font-size: 12px;
    font-weight: 600;

    border-radius: 10px;
    border: none;

    cursor: pointer;

    white-space: nowrap;

    transition: 0.2s ease;
}

.dashboard-open-btn:hover {
    filter: brightness(1.08);
}