:root {
    --bg: #0a0a0a;
    --panel: #151515;
    --text: #f5f5f5;
    --muted: #b8b8b8;
    --primary: #e50914;
    --primary-dark: #99000a;
    --accent: #ff1f2d;
    --danger: #ff1f2d;
    --border: #2b2b2b;
    --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
    --radius: 20px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg);
    color: var(--text);
}

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

input,
select,
button {
    font: inherit;
}

input,
select {
    width: 100%;
    margin-top: 8px;
    padding: 12px 14px;
    border-radius: 14px;
    border: 1px solid var(--border);
    background: #0f0f0f;
    color: var(--text);
}

button,
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: 0;
    border-radius: 14px;
    padding: 12px 18px;
    cursor: pointer;
    transition: transform 0.2s ease;
}

button:hover,
.btn:hover {
    transform: translateY(-1px);
}

button:disabled,
input:disabled {
    cursor: not-allowed;
    opacity: 0.55;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
}

.btn-secondary {
    background: #242424;
    color: #fff;
    border: 1px solid #3a3a3a;
}

.btn-danger {
    background: #2a0b0e;
    color: var(--danger);
    border: 1px solid #5f1016;
}

.flash {
    position: fixed;
    top: 18px;
    right: 18px;
    z-index: 20;
    padding: 14px 18px;
    border-radius: 14px;
    box-shadow: var(--shadow);
}

.flash-success {
    background: #141414;
    color: #fff;
    border: 1px solid var(--primary);
}

.flash-error {
    background: #2a0b0e;
    color: #fff;
    border: 1px solid var(--danger);
}

.auth-shell {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 24px;
    padding: 32px;
}

.auth-panel {
    background: var(--panel);
    border-radius: 28px;
    padding: 36px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.auth-brand {
    background: linear-gradient(160deg, #050505, #1f0508);
    color: #fff;
    display: flex;
    flex-direction: column;
    justify-content: center;
    border: 1px solid #5f1016;
}

.eyebrow {
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent);
    font-size: 0.78rem;
    margin-bottom: 10px;
}

.feature-list,
.helper-links {
    color: var(--muted);
}

.stack-md,
.stack-lg {
    display: grid;
    gap: 16px;
}

.stack-lg {
    gap: 20px;
}

.coupon-status {
    display: block;
    margin-top: 8px;
    color: var(--muted);
}

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

.sidebar {
    background: linear-gradient(180deg, #050505, #1a0507);
    color: #fff;
    padding: 28px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    border-right: 1px solid #2a0b0e;
}

.nav-links {
    display: grid;
    gap: 10px;
    margin-top: 24px;
}

.nav-links-top {
    margin-bottom: 0;
}

.nav-links a {
    padding: 12px 14px;
    border-radius: 14px;
    color: rgba(255, 255, 255, 0.84);
}

.nav-links a.active,
.nav-links a:hover {
    background: rgba(229, 9, 20, 0.22);
    color: #fff;
}

.dashboard-main {
    padding: 28px;
}

.toolbar,
.panel-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.toolbar-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: flex-end;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    margin: 24px 0;
}

.stat-card,
.panel {
    background: var(--panel);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 22px;
    border: 1px solid var(--border);
}

.stat-card span {
    display: block;
    color: var(--muted);
    margin-bottom: 12px;
}

.stat-card strong {
    font-size: 1.6rem;
}

.table-wrap {
    overflow: auto;
}

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

th,
td {
    text-align: left;
    padding: 14px 12px;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

th {
    color: var(--muted);
    font-size: 0.9rem;
    font-weight: 600;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

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

.chat-panel {
    max-width: 720px;
}

@media (max-width: 960px) {
    .auth-shell,
    .dashboard-shell,
    .card-grid,
    .form-grid {
        grid-template-columns: 1fr;
    }
}