/* NutriAI Design System */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@500;700;800&display=swap');

:root {
    /* Palette - Modern Tech/Health (Dark Mode) */
    --primary: #6366f1; /* Indigo 500 */
    --primary-dark: #4338ca;
    --primary-light: #818cf8;
    --accent: #10b981; /* Emerald 500 */
    --accent-glow: rgba(16, 185, 129, 0.4);
    
    --bg-body: #0f172a; /* Slate 900 */
    --bg-sidebar: #0f172a;
    --bg-card: #1e293b; /* Slate 800 */
    --bg-input: #020617; /* Slate 950 */
    
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    
    --gradient-main: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
    --gradient-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --gradient-fire: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    
    --radius-lg: 24px;
    --radius-md: 16px;
    --radius-sm: 8px;
    
    --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.3);
    --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.3);
    --transition: 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-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    line-height: 1.1;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* Components */
.container {
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 24px;
}

.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255,255,255,0.05);
    padding: 24px;
    transition: var(--transition);
}

.card:hover {
    border-color: rgba(255,255,255,0.1);
    box-shadow: var(--shadow-card);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 100px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: 'Outfit', sans-serif;
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background: var(--gradient-main);
    color: #fff;
    box-shadow: 0 5px 20px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 16px 32px;
    font-size: 1.1rem;
}

.input-group {
    margin-bottom: 20px;
}

.input-label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
}

.input-field {
    width: 100%;
    padding: 16px;
    background: var(--bg-input);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
    color: #fff;
    font-size: 1rem;
    transition: var(--transition);
    font-family: 'Inter', sans-serif;
}

.input-field:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

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

.sidebar {
    width: 280px;
    background: var(--bg-sidebar);
    border-right: 1px solid rgba(255,255,255,0.05);
    padding: 32px 24px;
    position: fixed;
    height: 100vh;
    z-index: 100;
}

.main-content {
    flex: 1;
    margin-left: 280px;
    padding: 40px;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 40px;
}

.logo i {
    color: var(--accent);
    font-size: 32px;
}

/* Navigation */
.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    border-radius: var(--radius-md);
    color: var(--text-muted);
    font-weight: 500;
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-light);
}

.nav-link i {
    font-size: 24px;
}

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

.page-title h1 {
    font-size: 32px;
    margin-bottom: 8px;
}

.page-title p {
    color: var(--text-muted);
}

/* Loading Spinner */
.loading {
    display: none;
    text-align: center;
    padding: 40px;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255,255,255,0.1);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    margin: 0 auto 20px;
    animation: spin 1s linear infinite;
}

@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* Mobile */
.mobile-toggle { display: none; }

@media (max-width: 968px) {
    .sidebar { transform: translateX(-100%);
    transition: transform 0.3s; 
    }
    .sidebar.open { transform: translateX(0); }
    .main-content { margin-left: 0; padding: 20px; }
    .mobile-toggle { 
        display: block; 
        position: fixed; top: 20px; right: 20px; z-index: 101;
        background: var(--bg-card); border: none; color: #fff; padding: 10px; border-radius: 8px;
    }
}