:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --text-main: #1e293b;
    --text-sub: #64748b;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    overflow-x: hidden;
}

/* Auth Screens */
.screen {
    display: none;
    min-height: 100vh;
}

.screen.active {
    display: flex;
}

.auth-container {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
}

.auth-card {
    display: none;
    background: var(--bg-card);
    width: 100%;
    max-width: 420px;
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    animation: slideUp 0.4s ease;
}

.auth-card.active {
    display: block;
}

.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.auth-header h1 {
    font-size: 28px;
    color: var(--primary);
    margin-bottom: 8px;
}

.auth-header p {
    color: var(--text-sub);
    font-size: 14px;
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-sub);
}

.form-group input, .form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    text-align: center;
    text-decoration: none;
    display: inline-block;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border);
    color: var(--text-sub);
}

.btn-outline:hover {
    background-color: #f1f5f9;
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 12px;
}

.auth-footer {
    margin-top: 24px;
    text-align: center;
    font-size: 13px;
    color: var(--text-sub);
}

.auth-footer a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

.auth-footer span {
    margin: 0 8px;
}

/* Dashboard Layout */
#dashboardScreen {
    height: 100vh;
}

.sidebar {
    width: 260px;
    background-color: #ffffff;
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 32px 24px;
}

.sidebar-header h2 {
    color: var(--primary);
    font-size: 24px;
    margin-bottom: 4px;
}

.user-badge {
    font-size: 12px;
    color: var(--text-sub);
}

.sidebar-nav {
    flex: 1;
    padding: 16px 8px;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    color: var(--text-sub);
    text-decoration: none;
    border-radius: 8px;
    margin-bottom: 4px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
}

.nav-item:hover {
    background-color: #f8fafc;
    color: var(--primary);
}

.nav-item.active {
    background-color: rgba(59, 130, 246, 0.05);
    color: var(--primary);
}

.nav-item .icon {
    margin-right: 12px;
    font-size: 18px;
}

.sidebar-footer {
    padding: 24px;
    border-top: 1px solid var(--border);
}

.main-content {
    flex: 1;
    overflow-y: auto;
    padding: 48px;
}

.page {
    display: none;
    max-width: 1000px;
    margin: 0 auto;
    animation: fadeIn 0.3s ease;
}

.page.active {
    display: block;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.page-header h1 {
    font-size: 28px;
}

.page-header p {
    color: var(--text-sub);
    font-size: 14px;
}

/* License Info Cards */
.license-card {
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    color: white;
    border-radius: 16px;
    padding: 32px;
    margin-bottom: 32px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.license-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 24px;
}

.license-type {
    font-size: 12px;
    text-transform: uppercase;
    background: rgba(255, 255, 255, 0.1);
    padding: 4px 12px;
    border-radius: 99px;
    letter-spacing: 0.1em;
}

.license-key {
    font-family: monospace;
    font-size: 20px;
    letter-spacing: 2px;
}

.stats-row {
    display: flex;
    gap: 48px;
}

.stat-group h4 {
    color: rgba(255, 255, 255, 0.6);
    font-size: 12px;
    margin-bottom: 8px;
}

.stat-group .value {
    font-size: 24px;
    font-weight: 700;
}

/* Card Common */
.card {
    background-color: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border);
    padding: 24px;
}

.empty-license-card {
    margin-bottom: 24px;
}

.purchase-banner {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    margin-bottom: 20px;
    padding: 14px 18px;
    border-radius: 12px;
    background: rgba(59, 130, 246, 0.08);
    border: 1px solid rgba(59, 130, 246, 0.16);
    color: var(--primary-dark);
}

.license-purchase-card {
    display: grid;
    gap: 24px;
}

.checkout-debug-card {
    margin-bottom: 24px;
    border: 1px solid rgba(245, 158, 11, 0.28);
    background: linear-gradient(180deg, #fffdf6 0%, #fff7e8 100%);
}

.checkout-debug-head {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: flex-start;
    margin-bottom: 20px;
}

.checkout-debug-head h3 {
    margin-bottom: 8px;
}

.checkout-debug-head p {
    color: var(--text-sub);
    line-height: 1.6;
}

.checkout-debug-badge {
    padding: 6px 10px;
    border-radius: 999px;
    background: rgba(245, 158, 11, 0.12);
    color: #b45309;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
}

.checkout-debug-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    margin-bottom: 18px;
}

.checkout-debug-item {
    padding: 14px 16px;
    border-radius: 12px;
    border: 1px solid rgba(148, 163, 184, 0.28);
    background: rgba(255, 255, 255, 0.82);
    display: grid;
    gap: 8px;
}

.checkout-debug-item span {
    color: var(--text-sub);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.checkout-debug-item code {
    word-break: break-all;
    white-space: normal;
    color: var(--text-main);
}

.checkout-debug-item-wide {
    grid-column: 1 / -1;
}

.checkout-debug-field {
    margin-bottom: 16px;
}

.checkout-debug-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.purchase-copy h3 {
    font-size: 22px;
    margin-bottom: 8px;
}

.purchase-copy p {
    color: var(--text-sub);
    line-height: 1.6;
}

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

.package-option {
    padding: 20px;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
}

.package-option.highlighted {
    border-color: rgba(59, 130, 246, 0.45);
    box-shadow: 0 14px 30px rgba(59, 130, 246, 0.12);
}

.package-option-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
}

.package-flag {
    padding: 4px 10px;
    border-radius: 999px;
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-dark);
    font-size: 12px;
    font-weight: 700;
}

.package-option p {
    color: var(--text-sub);
    line-height: 1.6;
    margin-bottom: 16px;
}

.package-metrics {
    margin: 0 0 18px;
    padding-left: 18px;
    color: var(--text-sub);
    line-height: 1.8;
}

.plan-action-btn[disabled] {
    opacity: 0.55;
    cursor: not-allowed;
}

/* Table Style */
.table {
    width: 100%;
    border-collapse: collapse;
}

.table th {
    text-align: left;
    padding: 12px 16px;
    font-size: 12px;
    text-transform: uppercase;
    color: var(--text-sub);
    border-bottom: 1px solid var(--border);
}

.table td {
    padding: 16px;
    font-size: 14px;
    border-bottom: 1px solid var(--border);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 100;
}

.modal-content {
    background-color: white;
    width: 100%;
    max-width: 500px;
    margin: 10vh auto;
    padding: 40px;
    border-radius: 16px;
    position: relative;
    animation: slideUp 0.3s ease;
}

.close-modal {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-sub);
}

.message {
    margin-top: 16px;
    padding: 12px;
    border-radius: 8px;
    font-size: 14px;
    display: none;
}

.message.success {
    display: block;
    background-color: #f0fdf4;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.message.error {
    display: block;
    background-color: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 900px) {
    .package-option-grid {
        grid-template-columns: 1fr;
    }

    .checkout-debug-grid {
        grid-template-columns: 1fr;
    }

    .stats-row {
        flex-direction: column;
        gap: 18px;
    }
}