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

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #15151f;
    --bg-card-hover: #1a1a28;
    --bg-elevated: #1c1c2e;
    --border: #1e1e30;
    --border-hover: #2a2a40;
    --text-primary: #e8e8ed;
    --text-secondary: #8a8a9a;
    --text-muted: #5a5a6a;
    --accent: #6366f1;
    --accent-hover: #5558e6;
    --accent-glow: rgba(99, 102, 241, 0.15);
    --green: #22c55e;
    --red: #ef4444;
    --orange: #f59e0b;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --shadow-card: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
    --shadow-elevated: 0 10px 40px rgba(0,0,0,0.4), 0 2px 8px rgba(0,0,0,0.3);
    --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
}

/* ============ LOGIN ============ */

.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--bg-primary);
    background-image: radial-gradient(ellipse at 50% 0%, rgba(99,102,241,0.08) 0%, transparent 60%);
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 400px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 40px 32px;
    animation: fadeUp 0.5s ease;
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.login-header h1 {
    font-size: 24px;
    font-weight: 700;
    margin-top: 12px;
    background: linear-gradient(135deg, #e8e8ed 0%, #a0a0b0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.login-subtitle {
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 4px;
}

.logo-icon {
    display: flex;
    justify-content: center;
}

/* ============ FORMS ============ */

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* ============ BUTTONS ============ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    box-shadow: 0 0 20px var(--accent-glow);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.btn-ghost:hover {
    background: var(--bg-card);
    color: var(--text-primary);
    border-color: var(--border-hover);
}

.btn-full {
    width: 100%;
    padding: 12px;
}

.btn-icon {
    padding: 8px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

.btn-danger:hover {
    color: var(--red) !important;
}

.btn-copy:hover {
    color: var(--green) !important;
}

/* ============ DASHBOARD LAYOUT ============ */

#app {
    display: flex;
    min-height: 100vh;
}

/* ============ SIDEBAR ============ */

.sidebar {
    width: 260px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    transition: transform var(--transition);
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px;
    border-bottom: 1px solid var(--border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-text {
    font-size: 18px;
    font-weight: 700;
    background: linear-gradient(135deg, #e8e8ed 0%, #a0a0b0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sidebar-close {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
}

.sidebar-nav {
    flex: 1;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    text-align: left;
    width: 100%;
}

.nav-item:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--accent-glow);
    color: var(--accent);
}

.sidebar-user {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 16px 20px;
    border-top: 1px solid var(--border);
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), #8b5cf6);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    color: white;
    flex-shrink: 0;
}

.user-info {
    flex: 1;
    min-width: 0;
}

.user-name {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
}

.user-email {
    display: block;
    font-size: 11px;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.logout-btn {
    color: var(--text-muted);
    transition: var(--transition);
    display: flex;
}

.logout-btn:hover {
    color: var(--red);
}

/* ============ MAIN CONTENT ============ */

.main-content {
    flex: 1;
    margin-left: 260px;
    padding: 0;
}

/* ============ TOPBAR ============ */

.topbar {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 32px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-primary);
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    background: rgba(10, 10, 15, 0.8);
}

.menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
}

.search-wrapper {
    flex: 1;
    position: relative;
    max-width: 480px;
}

.search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: 10px 14px 10px 42px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    transition: var(--transition);
    outline: none;
}

.search-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.search-input::placeholder {
    color: var(--text-muted);
}

/* ============ CONTENT AREA ============ */

.content-area {
    padding: 32px;
}

.grid-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.grid-title {
    font-size: 20px;
    font-weight: 600;
}

.grid-count {
    font-size: 13px;
    color: var(--text-muted);
    background: var(--bg-elevated);
    padding: 4px 12px;
    border-radius: 20px;
}

/* ============ CARDS GRID ============ */

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
}

/* ============ CARD ============ */

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 20px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    display: flex;
    flex-direction: column;
    animation: cardIn 0.3s ease;
}

.card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-card);
}

.card-pinned {
    border-color: rgba(99, 102, 241, 0.3);
}

.card-pinned::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), #8b5cf6);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 10px;
}

.card-title {
    font-size: 15px;
    font-weight: 600;
    line-height: 1.4;
    flex: 1;
    word-break: break-word;
}

.card-pin-btn {
    flex-shrink: 0;
    margin-left: 8px;
}

.card-pin-btn.active {
    color: var(--orange) !important;
}

.card-body {
    flex: 1;
    margin-bottom: 14px;
}

.card-content {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    word-break: break-word;
    white-space: pre-wrap;
    display: -webkit-box;
    -webkit-line-clamp: 6;
    -webkit-box-orient: vertical;
    overflow: hidden;
    max-height: 150px;
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.card-actions {
    display: flex;
    align-items: center;
    gap: 4px;
}

.card-time {
    font-size: 11px;
    color: var(--text-muted);
}

/* ============ SKELETON ============ */

.skeleton-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
}

.skeleton-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 20px;
}

.skeleton-line {
    height: 14px;
    background: var(--bg-elevated);
    border-radius: 4px;
    margin-bottom: 10px;
    animation: shimmer 1.5s infinite;
}

.skeleton-title {
    width: 60%;
    height: 18px;
}

.skeleton-text {
    width: 100%;
}

.skeleton-text.short {
    width: 40%;
}

@keyframes shimmer {
    0% { opacity: 0.6; }
    50% { opacity: 1; }
    100% { opacity: 0.6; }
}

/* ============ EMPTY STATE ============ */

.empty-state {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 80px 20px;
    color: var(--text-muted);
}

.empty-state.show {
    display: flex;
}

.empty-icon {
    margin-bottom: 20px;
    opacity: 0.3;
}

.empty-state h3 {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.empty-state p {
    font-size: 14px;
}

/* ============ MODAL ============ */

.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 200;
    align-items: center;
    justify-content: center;
    padding: 20px;
    animation: fadeIn 0.15s ease;
}

.modal-overlay.show {
    display: flex;
}

.modal {
    width: 100%;
    max-width: 520px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    animation: scaleIn 0.2s ease;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--text-primary);
    background: var(--bg-card);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 24px;
}

/* ============ TOAST ============ */

#toastContainer {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 300;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 12px 20px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
    box-shadow: var(--shadow-elevated);
    animation: slideUp 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.toast-success {
    border-color: rgba(34, 197, 94, 0.3);
}

.toast-success::before {
    content: '✓';
    color: var(--green);
    font-weight: 700;
}

.toast-error {
    border-color: rgba(239, 68, 68, 0.3);
}

.toast-error::before {
    content: '✕';
    color: var(--red);
    font-weight: 700;
}

.toast-removing {
    animation: slideDown 0.2s ease forwards;
}

/* ============ ANIMATIONS ============ */

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

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

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

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

@keyframes cardIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============ RESPONSIVE ============ */

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-close {
        display: block;
    }

    .menu-btn {
        display: block;
    }

    .main-content {
        margin-left: 0;
    }

    .topbar {
        padding: 12px 16px;
    }

    .content-area {
        padding: 16px;
    }

    .cards-grid {
        grid-template-columns: 1fr;
    }

    .skeleton-grid {
        grid-template-columns: 1fr;
    }

    .btn-new-text {
        display: none;
    }

    .modal {
        padding: 20px;
    }

    #toastContainer {
        left: 16px;
        right: 16px;
        bottom: 16px;
    }
}

@media (min-width: 1200px) {
    .cards-grid {
        grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    }
}

/* ============ SCROLLBAR ============ */

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-hover);
}

/* ============ SELECTION ============ */

::selection {
    background: var(--accent);
    color: white;
}