/* Modern UI Design System for Nest v1.0 */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap');

:root {
    --bg-dark: #0f111a;
    --bg-card: #181b28;
    --bg-input: #1f2335;
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #2e344e;
    --accent-pin: #f59e0b;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --success: #10b981;
    --shadow-premium: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: 'Outfit', sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header / Navigation */
header {
    background: rgba(24, 27, 40, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--text-main);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo span {
    background: linear-gradient(135deg, #818cf8 0%, #c084fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.user-badge {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
}

.btn-logout {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    transition: var(--transition-smooth);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.btn-logout:hover {
    color: var(--danger);
    border-color: rgba(239, 68, 68, 0.4);
    background: rgba(239, 68, 68, 0.05);
}

/* Flash Messages */
.flash-container {
    max-width: 800px;
    margin: 1.5rem auto 0;
    padding: 0 2rem;
    width: 100%;
}

.alert {
    padding: 1rem 1.25rem;
    border-radius: 12px;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-weight: 500;
    animation: fadeIn 0.3s ease-out;
}

.alert-success {
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #34d399;
}

.alert-danger {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #f87171;
}

.alert-warning {
    background: rgba(245, 158, 11, 0.15);
    border: 1px solid rgba(245, 158, 11, 0.3);
    color: #fbbf24;
}

/* Auth / Login Page */
.auth-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.auth-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 3rem;
    width: 100%;
    max-width: 450px;
    box-shadow: var(--shadow-premium);
    text-align: center;
}

.auth-header h1 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.auth-header p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 2rem;
}

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

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.form-control {
    width: 100%;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    border-radius: 12px;
    padding: 0.85rem 1rem;
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition-smooth);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.btn-primary {
    width: 100%;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 12px;
    padding: 0.85rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: translateY(0);
}

/* Dashboard / Notes Page */
.dashboard-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    width: 100%;
    flex: 1;
}

.dashboard-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.search-bar {
    display: flex;
    gap: 0.75rem;
    flex: 1;
    max-width: 500px;
}

.search-input {
    flex: 1;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0.75rem 1.25rem;
    color: var(--text-main);
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition-smooth);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
}

.btn-search {
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 0.75rem 1.25rem;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition-smooth);
}

.btn-search:hover {
    background-color: var(--border-color);
}

.btn-create-trigger {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    color: white;
    border: none;
    border-radius: 12px;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.3);
}

.btn-create-trigger:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

/* Notes Grid */
.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.note-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    position: relative;
    transition: var(--transition-smooth);
}

.note-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-premium);
    border-color: rgba(99, 102, 241, 0.4);
}

.note-card.pinned {
    border-color: rgba(245, 158, 11, 0.5);
    background: linear-gradient(180deg, var(--bg-card) 0%, rgba(245, 158, 11, 0.02) 100%);
}

.pin-indicator {
    position: absolute;
    top: 1rem;
    right: 1rem;
    color: var(--accent-pin);
    background: rgba(245, 158, 11, 0.1);
    border-radius: 50%;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.note-header {
    margin-bottom: 1rem;
    padding-right: 2rem;
}

.note-title {
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--text-main);
    word-break: break-word;
}

.note-content {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    white-space: pre-wrap;
    word-break: break-word;
    flex: 1;
}

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

.note-date {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.note-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-icon {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    border-radius: 8px;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.btn-icon:hover {
    color: var(--text-main);
    background-color: var(--bg-input);
    border-color: var(--text-muted);
}

.btn-icon.delete:hover {
    color: var(--danger);
    background-color: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.3);
}

.btn-icon.pin:hover {
    color: var(--accent-pin);
    background-color: rgba(245, 158, 11, 0.1);
    border-color: rgba(245, 158, 11, 0.3);
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(15, 17, 26, 0.8);
    backdrop-filter: blur(8px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    width: 100%;
    max-width: 600px;
    box-shadow: var(--shadow-premium);
    animation: slideUp 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.modal-close:hover {
    color: var(--text-main);
}

.modal-body {
    padding: 2rem;
}

.modal-footer {
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-main);
    border-radius: 12px;
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition-smooth);
}

.btn-secondary:hover {
    background-color: var(--bg-input);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 5rem 2rem;
    border: 2px dashed var(--border-color);
    border-radius: 24px;
    background: rgba(24, 27, 40, 0.2);
}

.empty-state-icon {
    font-size: 3rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.empty-state h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 600px) {
    .dashboard-header {
        flex-direction: column;
        align-items: stretch;
    }
    .search-bar {
        max-width: none;
    }
    .auth-card {
        padding: 2rem 1.5rem;
    }
}