/* --- Base Variables & Theming --- */
:root {
    /* Fonts */
    --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
    --font-heading: 'Plus Jakarta Sans', var(--font-primary);
    
    /* Layout & Utilities */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Dark Theme (Default: Digital Luxury) */
    --bg-main: #0B0F19; /* Deep digital blue/black */
    --bg-surface: #131B2F; /* Slightly lighter surface */
    --bg-surface-elevated: #1A243D; /* Elevated elements */
    --bg-glass: rgba(19, 27, 47, 0.7); /* Glassmorphism base */
    
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-glow: rgba(59, 130, 246, 0.3);
    
    --accent-primary: #3B82F6; /* Vivid Blue */
    --accent-primary-hover: #2563EB;
    --accent-gradient: linear-gradient(135deg, #3B82F6 0%, #8B5CF6 100%);
    
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.15);

    /* Status Colors */
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
}

[data-theme="light"] {
    /* Light Theme (Elegant Minimalist) */
    --bg-main: #F8FAFC; 
    --bg-surface: #FFFFFF; 
    --bg-surface-elevated: #F1F5F9;
    --bg-glass: rgba(255, 255, 255, 0.8);
    
    --text-primary: #0F172A;
    --text-secondary: #475569;
    
    --border-color: rgba(0, 0, 0, 0.08);
    --border-glow: rgba(59, 130, 246, 0.2);
    
    --shadow-sm: 0 2px 4px -1px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 15px rgba(59, 130, 246, 0.1);
}

/* --- Resets & Foundations --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: var(--font-primary);
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    transition: background-color var(--transition-smooth), color var(--transition-smooth);
}
h1, h2, h3, h4, h5, h6 { font-family: var(--font-heading); font-weight: 700; line-height: 1.2; color: var(--text-primary); }
a { color: var(--accent-primary); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--accent-primary-hover); }
img { max-width: 100%; display: block; }
ul { list-style: none; }

.container { width: 100%; max-width: 1280px; margin: 0 auto; padding: 0 24px; }

/* --- Typography Utilities --- */
.text-center { text-align: center; }
.text-muted { color: var(--text-secondary); }
.mt-1 { margin-top: 1rem; } .mt-2 { margin-top: 2rem; } .mt-3 { margin-top: 3rem; }
.mb-1 { margin-bottom: 1rem; } .mb-2 { margin-bottom: 2rem; }

/* --- Buttons --- */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 12px 24px; font-weight: 600; font-size: 0.95rem;
    border-radius: var(--radius-sm); cursor: pointer; border: none;
    transition: all var(--transition-smooth); letter-spacing: 0.3px;
}
.btn-primary {
    background: var(--accent-gradient); color: #fff;
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.3);
}
.btn-primary:hover {
    transform: translateY(-2px); box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4); color: #fff;
}
.btn-secondary {
    background: var(--bg-surface-elevated); color: var(--text-primary);
    border: 1px solid var(--border-color);
}
.btn-secondary:hover { background: var(--bg-main); transform: translateY(-1px); }
.btn-outline {
    background: transparent; color: var(--accent-primary);
    border: 1px solid var(--accent-primary);
}
.btn-outline:hover { background: var(--accent-primary); color: #fff; }

/* --- Forms --- */
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 8px; font-size: 0.9rem; font-weight: 500; color: var(--text-secondary); }
.form-control {
    width: 100%; padding: 14px 16px; font-size: 1rem; font-family: inherit;
    background-color: var(--bg-surface); color: var(--text-primary);
    border: 1px solid var(--border-color); border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}
.form-control:focus { outline: none; border-color: var(--accent-primary); box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1); }
textarea.form-control { resize: vertical; min-height: 100px; }
select.form-control { appearance: none; background-image: url('data:image/svg+xml;utf8,<svg fill="%2394A3B8" height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M7 10l5 5 5-5z"/></svg>'); background-repeat: no-repeat; background-position: right 12px center; padding-right: 40px; }

/* --- Navbar (Glassmorphism) --- */
.navbar {
    position: sticky; top: 0; z-index: 1000;
    background: var(--bg-glass); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}
.nav-container { display: flex; justify-content: space-between; align-items: center; padding: 16px 24px; }
.brand { font-family: var(--font-heading); font-size: 1.5rem; font-weight: 800; background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; letter-spacing: -0.5px; }
.nav-links { display: flex; gap: 24px; align-items: center; }
.nav-links a { color: var(--text-secondary); font-weight: 500; font-size: 0.95rem; }
.nav-links a:hover { color: var(--text-primary); }
.auth-links { display: flex; gap: 12px; align-items: center; }

/* Theme Toggle Button */
.theme-toggle { background: transparent; border: none; color: var(--text-secondary); cursor: pointer; padding: 8px; border-radius: 50%; display: flex; align-items: center; justify-content: center; transition: all var(--transition-fast); }
.theme-toggle:hover { color: var(--accent-primary); background: var(--bg-surface-elevated); }
.theme-toggle svg { width: 20px; height: 20px; fill: currentColor; }

/* --- Cards (Luxury Digital Style) --- */
.card {
    background: var(--bg-surface); border: 1px solid var(--border-color);
    border-radius: var(--radius-md); padding: 32px;
    box-shadow: var(--shadow-sm); transition: all var(--transition-smooth);
    position: relative; overflow: hidden;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md), var(--shadow-glow); border-color: var(--border-glow); }
.card::before {
    content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 4px;
    background: var(--accent-gradient); opacity: 0; transition: opacity var(--transition-smooth);
}
.card:hover::before { opacity: 1; }

/* --- Layout Grids --- */
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; }

/* --- Sections & Hero --- */
.section { padding: 80px 0; }
.bg-light { background-color: var(--bg-main); /* Merged backgrounds for seamless luxury feel, relying on cards for depth */ }
.page-header { text-align: center; padding: 60px 0; background: var(--bg-surface); border-bottom: 1px solid var(--border-color); }
.page-header h1 { font-size: 2.5rem; margin-bottom: 12px; }
.page-header p { color: var(--text-secondary); font-size: 1.1rem; max-width: 600px; margin: 0 auto; }

.hero {
    padding: 140px 0; text-align: center; position: relative; overflow: hidden;
    background: radial-gradient(circle at center, var(--bg-surface-elevated) 0%, var(--bg-main) 100%);
}
.hero::after {
    /* Digital Grid Overlay */
    content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    background-image: linear-gradient(var(--border-color) 1px, transparent 1px), linear-gradient(90deg, var(--border-color) 1px, transparent 1px);
    background-size: 40px 40px; opacity: 0.2; z-index: 0; pointer-events: none;
}
.hero-content { position: relative; z-index: 1; }
.hero h1 { font-size: clamp(2.5rem, 5vw, 4.5rem); letter-spacing: -1px; margin-bottom: 24px; }
.hero p { font-size: clamp(1.1rem, 2vw, 1.25rem); color: var(--text-secondary); max-width: 700px; margin: 0 auto 40px; }

/* --- specific Components --- */
.feature-list li { position: relative; padding-left: 24px; margin-bottom: 12px; color: var(--text-secondary); font-size: 0.95rem; }
.feature-list li::before { content: '→'; position: absolute; left: 0; color: var(--accent-primary); font-weight: bold; }

.testimonial-card .avatar {
    width: 64px; height: 64px; border-radius: 50%; background: var(--accent-gradient);
    color: #fff; display: flex; align-items: center; justify-content: center;
    font-size: 1.5rem; font-weight: bold; margin: 0 auto 20px; box-shadow: var(--shadow-glow);
}
.testimonial-card .feedback { font-style: italic; font-size: 1.1rem; color: var(--text-primary); margin-bottom: 20px; line-height: 1.8; }

table { width: 100%; border-collapse: separate; border-spacing: 0; }
th { padding: 16px; background: var(--bg-surface-elevated); color: var(--text-secondary); font-weight: 600; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.5px; border-bottom: 1px solid var(--border-color); }
td { padding: 16px; border-bottom: 1px solid var(--border-color); color: var(--text-primary); font-size: 0.95rem; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--bg-surface-elevated); }

/* --- Admin / Client Layout --- */
.dashboard-layout { display: flex; gap: 30px; align-items: flex-start; }
.sidebar { width: 260px; flex-shrink: 0; position: sticky; top: 100px; }
.sidebar ul li a {
    display: block; padding: 12px 16px; border-radius: var(--radius-sm);
    color: var(--text-secondary); font-weight: 500; transition: all var(--transition-fast);
}
.sidebar ul li a:hover { background: var(--bg-surface-elevated); color: var(--text-primary); }
.sidebar ul li a.active { background: var(--accent-gradient); color: #fff; box-shadow: var(--shadow-glow); }
.dashboard-content { flex-grow: 1; min-width: 0; /* Prevent overflow issues */ }

/* --- Footer --- */
.footer { background: var(--bg-surface); padding: 80px 0 24px; border-top: 1px solid var(--border-color); }
.footer-container { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer h3 { font-size: 1.1rem; margin-bottom: 24px; }
.footer-links li { margin-bottom: 12px; }
.footer-bottom { text-align: center; padding-top: 24px; border-top: 1px solid var(--border-color); color: var(--text-secondary); font-size: 0.9rem; }

/* --- Responsive Adjustments --- */
@media (max-width: 992px) {
    .dashboard-layout { flex-direction: column; }
    .sidebar { width: 100%; position: relative; top: 0; }
    .sidebar ul { display: flex; overflow-x: auto; padding-bottom: 10px; gap: 10px; }
    .sidebar ul li { flex-shrink: 0; margin-bottom: 0 !important; }
}

@media (max-width: 768px) {
    .nav-container { flex-direction: column; gap: 16px; padding: 16px; }
    .nav-links { flex-wrap: wrap; justify-content: center; }
    .footer-container { grid-template-columns: 1fr; gap: 32px; text-align: center; }
    .section { padding: 60px 0; }
    .hero { padding: 100px 0; }
    .card { padding: 24px; }
    table { display: block; overflow-x: auto; white-space: nowrap; }
}