:root {
    --bg-dark: #0f172a;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --danger: #ef4444;
    --success: #10b981;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-dark);
    color: var(--text-main);
    overflow: hidden; /* Prevent scrolling on body, scroll content instead */
    height: 100vh;
    width: 100vw;
}

/* Aurora Background Animation */
.aurora-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: 
        radial-gradient(circle at 10% 20%, rgba(56, 189, 248, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(139, 92, 246, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 50% 50%, rgba(15, 23, 42, 1) 0%, transparent 100%);
    opacity: 0.8;
}

/* Layout */
.app-layout {
    display: flex;
    height: 100%;
    width: 100%;
}

/* Sidebar (Desktop) */
.sidebar {
    width: 260px;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(12px);
    border-right: 1px solid var(--glass-border);
    padding: 2rem 1rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.3s ease;
}

.brand {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #60a5fa, #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    padding-left: 1rem;
    margin-bottom: 3rem;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.8rem 1rem;
    border-radius: 12px;
    color: var(--text-muted);
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 500;
    border: 1px solid transparent;
}

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

.nav-item.active {
    background: rgba(59, 130, 246, 0.15);
    color: #60a5fa;
    border-color: rgba(59, 130, 246, 0.2);
}

/* Main Content Area */
.main-content {
    flex: 1;
    position: relative;
    overflow-y: auto;
    padding: 2rem;
    scroll-behavior: smooth;
}

/* Glass Card Container */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    max-width: 800px;
    margin: 0 auto;
    animation: fadeIn 0.4s ease-out;
}

/* Live Preview Split (Desktop) */
.split-view {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    height: 100%;
}

.preview-pane {
    background: #fff;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
    display: flex;
    flex-direction: column;
}

.preview-header {
    background: #e2e8f0;
    padding: 0.8rem;
    display: flex;
    gap: 6px;
    border-bottom: 1px solid #cbd5e1;
}

.dot { width: 10px; height: 10px; border-radius: 50%; background: #cbd5e1; }
.dot.red { background: #ef4444; }
.dot.amber { background: #f59e0b; }
.dot.green { background: #10b981; }

.preview-frame {
    flex: 1;
    border: none;
    background: white;
    width: 100%;
    height: 100%;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
    position: relative;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
}

input, select, textarea {
    width: 100%;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1rem;
    color: var(--text-main);
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.2s;
    outline: none;
}

input:focus, select:focus, textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
    background: rgba(15, 23, 42, 0.8);
}

/* Buttons */
.btn {
    width: 100%;
    padding: 1rem;
    border-radius: 12px;
    border: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), #2563eb);
    color: white;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-primary:active { transform: scale(0.98); }

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

/* Mobile Nav (Hidden on Desktop) */
.mobile-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(16px);
    border-top: 1px solid var(--glass-border);
    padding: 1rem;
    justify-content: space-around;
    z-index: 100;
}

/* Login Wall */
#loginWall {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 999;
    background: var(--bg-dark);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar { display: none; }
    .mobile-nav { display: flex; }
    .main-content { padding: 1rem; padding-bottom: 80px; }
    .split-view { grid-template-columns: 1fr; }
    .preview-pane { display: none; } /* Show on dedicated tab instead */
    .glass-panel { padding: 1.5rem; }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Utilities */
.hidden { display: none !important; }
.text-center { text-align: center; }
.mb-4 { margin-bottom: 1rem; }