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

:root {
    --bg-color: #0d0f14;
    --card-bg: rgba(255, 255, 255, 0.03);
    --card-border: rgba(255, 255, 255, 0.08);
    --accent-color: #6366f1;
    --accent-hover: #4f46e5;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --glass-blur: 12px;
    --radius: 16px;
    --transition: 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-color);
    background-image: 
        radial-gradient(circle at 0% 0%, rgba(99, 102, 241, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 100% 100%, rgba(139, 92, 246, 0.05) 0%, transparent 50%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
    overflow-x: hidden;
}

/* Glassmorphism utility */
.glass {
    background: var(--card-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 2rem;
}

/* Navbar */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    margin-bottom: 2rem;
    position: sticky;
    top: 1rem;
    z-index: 100;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #fff 0%, #94a3b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s var(--transition);
}

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

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s var(--transition);
    border: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px -10px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
}

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

label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

input, textarea {
    width: 100%;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.2s var(--transition);
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    background: rgba(255, 255, 255, 0.05);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

/* Cards & Grid */
.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.note-card {
    padding: 1.5rem;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 250px;
    animation: fadeIn 0.5s var(--transition);
}

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

.note-card:hover {
    border-color: rgba(255, 255, 255, 0.15);
}

.note-card h3 {
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

.note-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 5;
    -webkit-box-orient: vertical;
}

.note-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--card-border);
}

.share-badge {
    padding: 0.25rem 0.75rem;
    background: rgba(16, 185, 129, 0.1);
    color: #10b981;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Login/Auth Page */
.auth-container {
    max-width: 400px;
    margin: 10vh auto;
    padding: 2.5rem;
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal-content {
    width: 90%;
    max-width: 600px;
    padding: 2.5rem;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

/* Responsive */
@media (max-width: 768px) {
    .container { padding: 1rem; }
    nav { padding: 1rem; }
    .nav-links span { display: none; }
    .notes-grid { grid-template-columns: 1fr; }
}