/**
 * Arslan Licensing Platform - Master Enterprise Admin CSS
 * Designed for 100% desktop and mobile responsiveness (320px to 1440px+).
 * WCAG AA Contrast, touch-friendly targets (44px min), modern dashboard aesthetic.
 */

:root {
    --bg-primary: #0f172a;
    --bg-surface: #1e293b;
    --bg-surface-elevated: #334155;
    --bg-input: #0f172a;
    --border-color: #334155;
    --border-focus: #6366f1;

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --color-brand: #6366f1;
    --color-brand-hover: #4f46e5;
    --color-brand-light: rgba(99, 102, 241, 0.15);

    --color-success: #10b981;
    --color-success-bg: rgba(16, 185, 129, 0.15);
    --color-warning: #f59e0b;
    --color-warning-bg: rgba(245, 158, 11, 0.15);
    --color-danger: #ef4444;
    --color-danger-bg: rgba(239, 68, 68, 0.15);
    --color-info: #3b82f6;
    --color-info-bg: rgba(59, 130, 246, 0.15);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.25);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);

    --sidebar-width: 260px;
    --header-height: 64px;
    --touch-min: 44px;
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    color: var(--color-brand);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: #818cf8;
}

/* Base Layout Structure */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar Navigation */
.app-sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 100;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.brand-badge {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--text-primary);
}

.brand-logo-icon {
    width: 34px;
    height: 34px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, #6366f1, #a855f7);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.1rem;
    font-weight: 800;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 1.25rem 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 0.7rem 0.9rem;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 500;
    min-height: var(--touch-min);
    transition: all 0.2s ease;
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.nav-link.active {
    background-color: var(--color-brand-light);
    color: #818cf8;
    font-weight: 600;
    border-left: 3px solid var(--color-brand);
}

.nav-link svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.sidebar-footer {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Main Content Area */
.app-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 100vh;
}

/* Top App Header */
.app-header {
    height: var(--header-height);
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    position: sticky;
    top: 0;
    z-index: 90;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    min-width: var(--touch-min);
    min-height: var(--touch-min);
    border-radius: var(--radius-sm);
    align-items: center;
    justify-content: center;
}

.header-title {
    font-size: 1.15rem;
    font-weight: 600;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-badge {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.9rem;
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background-color: var(--bg-surface-elevated);
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: #818cf8;
}

/* Content Container */
.app-content {
    flex: 1;
    padding: 1.5rem;
    max-width: 1440px;
    width: 100%;
    margin: 0 auto;
}

/* Cards & Containers */
.card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.card-header {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card-body {
    padding: 1.25rem;
}

/* KPI Grid */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}

.kpi-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.kpi-card:hover {
    border-color: #475569;
    transform: translateY(-2px);
}

.kpi-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.kpi-icon.indigo { background: rgba(99, 102, 241, 0.15); color: #818cf8; }
.kpi-icon.emerald { background: rgba(16, 185, 129, 0.15); color: #34d399; }
.kpi-icon.blue { background: rgba(59, 130, 246, 0.15); color: #60a5fa; }
.kpi-icon.amber { background: rgba(245, 158, 11, 0.15); color: #fbbf24; }

.kpi-value {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

.kpi-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.6rem 1.1rem;
    min-height: var(--touch-min);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.2s ease;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--color-brand);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: var(--color-brand-hover);
    color: #ffffff;
}

.btn-secondary {
    background-color: var(--bg-surface-elevated);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-secondary:hover {
    background-color: #475569;
}

.btn-danger {
    background-color: var(--color-danger);
    color: #ffffff;
}

.btn-danger:hover {
    background-color: #dc2626;
}

.btn-warning {
    background-color: var(--color-warning);
    color: #1e293b;
}

.btn-sm {
    padding: 0.35rem 0.65rem;
    font-size: 0.8rem;
    min-height: 36px;
}

/* Form Controls */
.form-group {
    margin-bottom: 1.2rem;
}

.form-label {
    display: block;
    margin-bottom: 0.4rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-control {
    width: 100%;
    min-height: var(--touch-min);
    padding: 0.6rem 0.9rem;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.form-text {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.3rem;
}

.form-grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

/* Tables */
.table-responsive {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

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

.table th {
    padding: 0.85rem 1rem;
    background-color: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.table td {
    padding: 0.9rem 1rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    vertical-align: middle;
}

.table tr:hover td {
    background-color: rgba(255, 255, 255, 0.02);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.6rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: capitalize;
}

.badge-active { background: var(--color-success-bg); color: var(--color-success); border: 1px solid rgba(16, 185, 129, 0.3); }
.badge-expired { background: var(--color-danger-bg); color: var(--color-danger); border: 1px solid rgba(239, 68, 68, 0.3); }
.badge-suspended { background: var(--color-warning-bg); color: var(--color-warning); border: 1px solid rgba(245, 158, 11, 0.3); }
.badge-revoked { background: var(--color-danger-bg); color: #f87171; border: 1px solid rgba(239, 68, 68, 0.4); }
.badge-pending { background: var(--color-info-bg); color: var(--color-info); border: 1px solid rgba(59, 130, 246, 0.3); }
.badge-deactivated { background: rgba(148, 163, 184, 0.15); color: #94a3b8; border: 1px solid #475569; }

/* Alerts */
.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.85rem;
    font-size: 0.92rem;
}

.alert-success { background: var(--color-success-bg); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.3); }
.alert-danger { background: var(--color-danger-bg); color: #f87171; border: 1px solid rgba(239, 68, 68, 0.3); }
.alert-warning { background: var(--color-warning-bg); color: #fbbf24; border: 1px solid rgba(245, 158, 11, 0.3); }
.alert-info { background: var(--color-info-bg); color: #60a5fa; border: 1px solid rgba(59, 130, 246, 0.3); }

/* One-time Key Display Banner */
.key-reveal-banner {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(168, 85, 247, 0.2));
    border: 2px solid var(--color-brand);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.key-code-box {
    background-color: #020617;
    border: 1px solid var(--border-color);
    padding: 0.85rem 1.2rem;
    border-radius: var(--radius-sm);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 1.2rem;
    color: #38bdf8;
    letter-spacing: 0.08em;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin: 1rem 0;
    word-break: break-all;
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    z-index: 200;
}

.modal-overlay.active {
    display: flex;
}

.modal-dialog {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 520px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    padding: 1.2rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    font-size: 1.15rem;
    font-weight: 600;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.75rem;
}

/* Sidebar Backdrop on Mobile */
.sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 95;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 240px;
    }
}

@media (max-width: 768px) {
    .app-sidebar {
        transform: translateX(-100%);
    }

    .app-sidebar.open {
        transform: translateX(0);
    }

    .sidebar-backdrop.active {
        display: block;
    }

    .app-main {
        margin-left: 0;
    }

    .mobile-menu-btn {
        display: inline-flex;
    }

    .form-grid-2 {
        grid-template-columns: 1fr;
    }

    .app-content {
        padding: 1rem;
    }

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

@media (max-width: 480px) {
    .card-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .header-right .user-email {
        display: none;
    }

    .table th, .table td {
        padding: 0.65rem 0.75rem;
        font-size: 0.85rem;
    }

    .btn {
        width: 100%;
    }
}