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

:root {
    --primary-color: #4CAF50;
    --primary-dark: #388E3C;
    --danger-color: #f44336;
    --background: #f8f9fa;
    --card-background: #ffffff;
    --text-primary: #212121;
    --text-secondary: #757575;
    --border-color: #e0e0e0;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 8px rgba(0,0,0,0.15);
    --sidebar-width: 280px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ========== SIDEBAR ========== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--card-background);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    z-index: 100;
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-title {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 600;
}

.sidebar-nav {
    padding: 20px 0;
}

.nav-section {
    margin-bottom: 24px;
}

.nav-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    font-weight: 600;
    letter-spacing: 0.5px;
    padding: 0 20px;
    margin-bottom: 12px;
}

.category-list {
    list-style: none;
}

.category-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 12px 20px;
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s;
    border-left: 3px solid transparent;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.category-item:hover {
    background: var(--background);
    border-left-color: var(--primary-color);
}

.category-item.active {
    background: #e8f5e9;
    border-left-color: var(--primary-color);
    color: var(--primary-color);
    font-weight: 500;
}

.category-name {
    flex: 1;
}

.category-count {
    background: var(--border-color);
    color: var(--text-secondary);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}

.category-item.active .category-count {
    background: var(--primary-color);
    color: white;
}

/* ========== MAIN CONTENT ========== */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    padding: 40px;
}

/* ========== SEARCH ZONE (Google Style) ========== */
.search-zone {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 80vh;
}

.search-container {
    text-align: center;
    max-width: 650px;
    width: 100%;
}

.app-logo {
    font-size: 6rem;
    margin-bottom: 30px;
    color: var(--primary-color);
}

.search-wrapper {
    margin-bottom: 30px;
}

.search-input {
    width: 100%;
    padding: 16px 24px;
    font-size: 1.1rem;
    border: 1px solid var(--border-color);
    border-radius: 50px;
    outline: none;
    transition: all 0.3s;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.search-input:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.12);
}

.search-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 4px 16px rgba(76, 175, 80, 0.2);
}

.add-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 2px 8px rgba(76, 175, 80, 0.3);
}

.add-button:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(76, 175, 80, 0.4);
}

.add-icon {
    font-size: 1.5rem;
    font-weight: 300;
}

/* ========== RESULTS ZONE ========== */
.results-zone {
    animation: fadeIn 0.3s ease;
}

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

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--border-color);
}

.results-title {
    font-size: 1.5rem;
    color: var(--text-primary);
    font-weight: 600;
}

.clear-btn {
    padding: 8px 16px;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.clear-btn:hover {
    background: var(--danger-color);
    color: white;
    border-color: var(--danger-color);
}

/* ========== BOOKMARKS LIST ========== */
.bookmarks-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}

.bookmark-card {
    background: var(--card-background);
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
    border-left: 4px solid var(--primary-color);
}

.bookmark-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.bookmark-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.bookmark-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    flex: 1;
}

.bookmark-actions {
    display: flex;
    gap: 8px;
}

.edit-btn,
.delete-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 5px;
    transition: transform 0.2s;
}

.edit-btn {
    color: var(--primary-color);
}

.delete-btn {
    color: var(--danger-color);
}

.edit-btn:hover,
.delete-btn:hover {
    transform: scale(1.2);
}

.bookmark-description {
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-size: 0.95rem;
}

.bookmark-category {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.85rem;
    margin-bottom: 10px;
}

.bookmark-labels {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.label-tag {
    background: var(--background);
    color: var(--text-secondary);
    padding: 3px 10px;
    border-radius: 10px;
    font-size: 0.8rem;
}

.bookmark-link {
    display: inline-flex;
    align-items: center;
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.9rem;
    margin-top: 8px;
    word-break: break-all;
}

.bookmark-link:hover {
    text-decoration: underline;
}

.bookmark-date {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 10px;
}

/* ========== MOBILE MENU ========== */
.mobile-menu-toggle {
    display: none;
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 200;
    background: var(--primary-color);
    color: white;
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    transition: all 0.3s;
}

.mobile-menu-toggle:hover {
    transform: scale(1.1);
}

/* ========== MODAL ========== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    overflow-y: auto;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-content {
    background: var(--card-background);
    border-radius: 12px;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}

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

.modal-header h2 {
    margin: 0;
    color: var(--text-primary);
}

.close {
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
}

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

/* ========== FORM ========== */
form {
    padding: 20px;
}

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

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 20px;
}

.btn-cancel,
.btn-submit {
    padding: 10px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-cancel {
    background: var(--background);
    color: var(--text-primary);
}

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

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

.btn-submit:hover {
    background: var(--primary-dark);
}

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

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

    .main-content {
        margin-left: 0;
        padding: 20px;
    }

    .mobile-menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .search-zone {
        min-height: 60vh;
    }

    .app-logo {
        font-size: 4rem;
    }

    .bookmarks-list {
        grid-template-columns: 1fr;
    }

    .results-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
}

@media (max-width: 480px) {
    .search-input {
        font-size: 1rem;
        padding: 14px 20px;
    }

    .add-button {
        padding: 12px 24px;
        font-size: 0.95rem;
    }
}