/* ==========================================================================
   ENTERPRISE MULTI-TENANT DESIGN SYSTEM & RESET
   ========================================================================== */
:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #4f46e5;
    --accent-color: #06b6d4;
    --bg-gradient: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    --sidebar-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(255, 255, 255, 0.5);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.04), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.08);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-gradient);
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.5;
}

/* ==========================================================================
   GLASSMORPHISM ARCHITECTURE MIXIN
   ========================================================================== */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    transition: var(--transition-smooth);
}
.glass:hover {
    box-shadow: var(--shadow-lg);
    border-color: rgba(255, 255, 255, 0.7);
}

/* ==========================================================================
   UNIVERSAL ROUTER / GATEWAY UI STYLES
   ========================================================================== */
.gateway-container {
    max-width: 480px;
    width: 100%;
    margin: 8vh auto;
    padding: 0 1.5rem;
    display: flex;
    flex-direction: column;
}

.gateway-header {
    text-align: center;
    margin-bottom: 2rem;
}
.gateway-header h1 {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-main);
    cursor: default;
    user-select: none;
}
.gateway-header p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-top: 0.25rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.gateway-tabs {
    display: flex;
    background: rgba(0, 0, 0, 0.05);
    padding: 0.35rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
}
.gateway-tab-btn {
    flex: 1;
    background: none;
    border: none;
    padding: 0.65rem;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition-smooth);
}
.gateway-tab-btn.active {
    background: #ffffff;
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.gateway-card {
    padding: 2.5rem 2rem;
}

.auth-panel {
    display: none;
}
.auth-panel.active {
    display: block;
    animation: fadeInGateway 0.3s ease-in-out;
}

.auth-panel h2 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.35rem;
}
.panel-subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1.75rem;
    line-height: 1.4;
}

/* ==========================================================================
   INPUTS & SELECTION SYSTEM COMPONENTS
   ========================================================================== */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    margin-bottom: 1.25rem;
}
.form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
}
.form-group input, .form-group select {
    padding: 0.75rem;
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: #ffffff;
    border-radius: var(--radius-sm);
    outline: none;
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition-smooth);
}
.form-group input:focus, .form-group select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 234, 0.15);
}

.btn-gateway-submit {
    width: 100%;
    background: var(--primary-color);
    color: #ffffff;
    border: none;
    padding: 0.85rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    margin-top: 0.5rem;
    box-shadow: 0 4px 12px rgba(37, 99, 234, 0.2);
    transition: var(--transition-smooth);
}
.btn-gateway-submit:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}
.btn-manager-override {
    background: #0f172a;
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.2);
}
.btn-manager-override:hover {
    background: #000000;
}

@keyframes fadeInGateway {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}