:root {
    /* Apple-inspired Color Palette */
    --primary-color: #007AFF;
    /* Apple Blue */
    --secondary-color: #1D1D1F;
    /* Apple Dark Text */
    --accent-color: #5AC8FA;
    /* Light Blue */
    --bg-color: #F5F5F7;
    /* Apple Light Background */
    --card-bg: rgba(255, 255, 255, 0.7);
    /* Glassmorphism Base */
    --text-color: #1D1D1F;
    --text-secondary: #86868B;
    --success-color: #34C759;
    --warning-color: #FF9500;
    --error-color: #FF3B30;

    /* Layout Constants */
    --sidebar-width: 280px;
    --header-height: 80px;
    --border-radius-lg: 20px;
    --border-radius-md: 12px;
    --border-radius-sm: 8px;

    /* Effects */
    --shadow-soft: 0 8px 30px rgba(0, 0, 0, 0.04);
    --shadow-hover: 0 10px 40px rgba(0, 0, 0, 0.08);
    --blur-effect: blur(20px) saturate(180%);
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", "Helvetica Neue", sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 10px;
}

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

/* Sidebar - Modern Minimalist */
.sidebar {
    width: var(--sidebar-width);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: var(--blur-effect);
    -webkit-backdrop-filter: var(--blur-effect);
    border-right: 1px solid rgba(0, 0, 0, 0.05);
    padding: 30px 20px;
    position: fixed;
    height: 100vh;
    z-index: 1000;
    transition: var(--transition-smooth);
}

.sidebar-header {
    margin-bottom: 50px;
    padding: 0 10px;
}

.sidebar-header h1 {
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--secondary-color);
}

.sidebar-header p {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--primary-color);
    font-weight: 600;
}

.nav-menu {
    list-style: none;
}

.nav-item {
    margin-bottom: 8px;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 12px 18px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--border-radius-md);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition-smooth);
}

.nav-link i {
    width: 24px;
    margin-right: 15px;
    font-size: 1.1rem;
    text-align: center;
}

.nav-link:hover {
    background: rgba(0, 122, 255, 0.05);
    color: var(--primary-color);
}

.nav-link.active {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 15px rgba(0, 122, 255, 0.3);
}

/* Main Content Area */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 40px;
    max-width: 1400px;
    width: 100%;
}

/* Header - Floating Glass */
.header {
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: var(--blur-effect);
    -webkit-backdrop-filter: var(--blur-effect);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-soft);
    margin-bottom: 40px;
    border: 1px solid rgba(255, 255, 255, 0.4);
}

.header-left h2 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.header-right .user-profile {
    display: flex;
    align-items: center;
    gap: 20px;
}

/* Cards & Containers */
.card {
    background: var(--card-bg);
    backdrop-filter: var(--blur-effect);
    -webkit-backdrop-filter: var(--blur-effect);
    border-radius: var(--border-radius-lg);
    padding: 30px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

/* Tables - Clean & Spacious */
table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0 10px;
}

th {
    text-align: left;
    padding: 15px;
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    font-weight: 600;
}

td {
    padding: 20px 15px;
    background: rgba(255, 255, 255, 0.4);
}

tr td:first-child {
    border-radius: var(--border-radius-md) 0 0 var(--border-radius-md);
}

tr td:last-child {
    border-radius: 0 var(--border-radius-md) var(--border-radius-md) 0;
}

/* Forms - iOS Inspired */
.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-secondary);
    padding-left: 5px;
}

.form-control {
    width: 100%;
    padding: 14px 18px;
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: var(--border-radius-md);
    font-size: 1rem;
    transition: var(--transition-smooth);
    outline: none;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.1);
}

/* Buttons - Premium Feel */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: var(--border-radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition-smooth);
    text-decoration: none;
}

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

.btn-primary:hover {
    filter: brightness(1.1);
    transform: scale(1.02);
}

.btn-secondary {
    background: rgba(0, 0, 0, 0.05);
    color: var(--secondary-color);
}

.btn-secondary:hover {
    background: rgba(0, 0, 0, 0.08);
}

.btn-outline {
    background: transparent;
    border: 1.5px solid var(--primary-color);
    color: var(--primary-color);
}

/* Login Page Overhaul */
.login-container {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at top right, #E3F2FD, #F5F5F7);
}

.login-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    padding: 50px;
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.05);
    width: 100%;
    max-width: 440px;
}

/* Responsive Grid Adjustments */
@media (max-width: 1200px) {
    .main-content {
        padding: 30px;
    }
}

@media (max-width: 992px) {
    .sidebar {
        width: 80px;
        padding: 30px 10px;
    }

    .sidebar .nav-link span,
    .sidebar-header h1,
    .sidebar-header p {
        display: none;
    }

    .sidebar .nav-link i {
        margin-right: 0;
        font-size: 1.4rem;
    }

    .main-content {
        margin-left: 80px;
    }
}

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

    .main-content {
        margin-left: 0;
        padding: 20px;
    }

    .header {
        padding: 0 20px;
    }
}