:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --secondary: #64748b;
    --bg-dark: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #8b5cf6;
    --success: #10b981;
    --error: #ef4444;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    background-image: radial-gradient(circle at 50% -20%, #1e1b4b, transparent);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navbar */
.navbar {
    padding: 1.5rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    font-family: 'Outfit', sans-serif;
}

.logo-icon {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    padding: 0.5rem 0.8rem;
    border-radius: 12px;
    font-weight: 800;
    margin-right: 0.5rem;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--text-main);
}

.nav-btn-primary {
    background: var(--primary);
    color: white !important;
    padding: 0.8rem 1.5rem;
    border-radius: 10px;
    font-weight: 600;
    transition: transform 0.2s, background 0.3s;
}

.nav-btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
}

.nav-btn-secondary {
    border: 1px solid var(--secondary);
    padding: 0.8rem 1.5rem;
    border-radius: 10px;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 4rem 0;
}

.section-hero {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 4rem;
}

.section-hero h1 {
    font-family: 'Outfit', sans-serif;
    font-size: 4rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(to bottom right, #fff, #94a3b8);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-hero p {
    font-size: 1.25rem;
    color: var(--text-muted);
}

/* Cards */
.card {
    background: var(--card-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 2.5rem;
    border-radius: 24px;
    backdrop-filter: blur(12px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

/* Forms */
.form-group {
    margin-bottom: 2rem;
}

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

.input-field {
    width: 100%;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: white;
    padding: 1rem;
    border-radius: 12px;
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

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

.btn-submit {
    width: 100%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    padding: 1.2rem;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s, opacity 0.3s;
}

.btn-submit:hover {
    transform: scale(1.02);
    opacity: 0.9;
}

/* Auth Pages */
.auth-container {
    max-width: 500px;
    margin: 0 auto;
}

.auth-header {
    text-align: center;
    margin-bottom: 3rem;
}

.auth-footer {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-muted);
}

.auth-footer a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

/* Generator UI */
.generator-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.qr-result-box {
    text-align: center;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 20px;
    border: 1px dashed rgba(255, 255, 255, 0.1);
}

.qr-image {
    max-width: 250px;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    background: white;
    padding: 1rem;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: white;
    color: var(--bg-dark);
    padding: 0.8rem 1.5rem;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 700;
    margin-top: 1rem;
}

/* Footer */
.footer {
    padding: 3rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
    text-align: center;
}

/* Alerts */
.alert {
    padding: 1.25rem 1.75rem;
    border-radius: 16px;
    margin-bottom: 2.5rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 1rem;
    line-height: 1.5;
    animation: slideIn 0.3s ease-out;
}

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

.alert-error {
    background: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #fca5a5;
}

.alert-success {
    background: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: #6ee7b7;
}

.alert svg {
    flex-shrink: 0;
}

@media (max-width: 768px) {
    .generator-grid {
        grid-template-columns: 1fr;
    }
    .section-hero h1 {
        font-size: 2.5rem;
    }
}