:root {
    --bg-primary: #0d0d0d;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #262626;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --text-tertiary: #808080;
    --accent: #10a37f;
    --accent-light: #1db584;
    --accent-dark: #088866;
    --border-color: #404040;
    --success: #34c759;
    --warning: #ff9500;
    --error: #ff3b30;
    --info: #3b82f6;
}

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

html,
body {
    width: 100%;
    height: 100%;
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* ===== SIDEBAR ===== */
.sidebar {
    width: 320px;
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
}

.new-chat-btn {
    width: 100%;
    padding: 10px 14px;
    background-color: var(--accent);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    font-size: 0.9em;
    transition: background-color 0.2s;
}

.new-chat-btn:hover {
    background-color: var(--accent-light);
}

/* Sidebar Tabs */
.sidebar-tabs {
    display: flex;
    gap: 8px;
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-primary);
}

.tab-btn {
    flex: 1;
    padding: 8px 12px;
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85em;
    font-weight: 500;
    transition: all 0.2s;
}

.tab-btn:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}

.tab-btn.active {
    background-color: var(--accent);
    color: white;
    border-color: var(--accent);
}

/* Sidebar Panels */
.sidebar-panel {
    flex: 1;
    padding: 12px;
    overflow-y: auto;
    display: none;
}

.sidebar-panel.active {
    display: flex;
    flex-direction: column;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.panel-header h3 {
    font-size: 0.95em;
    font-weight: 600;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.1em;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.2s;
}

.icon-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--accent);
}

/* Task List */
.task-input-section {
    display: flex;
    gap: 6px;
    margin-bottom: 12px;
}

.task-input {
    flex: 1;
    padding: 8px 10px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 6px;
    font-size: 0.85em;
}

.task-input:focus {
    outline: none;
    border-color: var(--accent);
    background-color: var(--bg-primary);
}

.confirm-btn {
    padding: 8px 12px;
    background-color: var(--accent);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    font-size: 0.85em;
}

.tasks-list,
.notes-list,
.history-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
    overflow-y: auto;
}

.task-item,
.note-item,
.history-item {
    padding: 10px 12px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.85em;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
}

.task-item:hover,
.note-item:hover,
.history-item:hover {
    background-color: var(--bg-primary);
    border-color: var(--accent);
}

.task-item.completed {
    opacity: 0.6;
    text-decoration: line-through;
}

.task-checkbox {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--accent);
}

.task-delete-btn,
.note-delete-btn {
    background: transparent;
    border: none;
    color: var(--error);
    cursor: pointer;
    font-size: 0.9em;
    opacity: 0;
    transition: opacity 0.2s;
}

.task-item:hover .task-delete-btn,
.note-item:hover .note-delete-btn {
    opacity: 1;
}

.empty-state {
    text-align: center;
    padding: 24px 12px;
    color: var(--text-tertiary);
    font-size: 0.85em;
}

/* Sidebar Footer */
.sidebar-footer {
    border-top: 1px solid var(--border-color);
    padding: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.stats {
    display: flex;
    gap: 16px;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.stat-label {
    font-size: 0.75em;
    color: var(--text-tertiary);
}

.stat-value {
    font-weight: 700;
    font-size: 1.1em;
}

/* ===== MAIN CONTENT ===== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.main-header {
    padding: 20px 28px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.header-left h1 {
    font-size: 1.8em;
    font-weight: 700;
    margin-bottom: 4px;
}

.tagline {
    font-size: 0.9em;
    color: var(--text-secondary);
}

.toggle-btn {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.5em;
    cursor: pointer;
}

/* Quick Actions */
.quick-actions {
    display: flex;
    gap: 10px;
    padding: 16px 28px;
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
    background-color: var(--bg-primary);
}

.action-btn {
    padding: 8px 14px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85em;
    font-weight: 500;
    white-space: nowrap;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
}

.action-btn:hover {
    background-color: var(--bg-secondary);
    border-color: var(--accent);
    color: var(--accent);
}

/* Chat Messages */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px 28px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.message {
    display: flex;
    gap: 12px;
    animation: slideIn 0.3s ease;
}

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

.message-avatar {
    font-size: 1.4em;
    min-width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.message-content {
    flex: 1;
    background-color: var(--bg-secondary);
    padding: 12px 16px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.bot-message {
    justify-content: flex-start;
}

.user-message {
    justify-content: flex-end;
}

.user-message .message-content {
    background-color: var(--accent);
    border-color: var(--accent-dark);
    color: white;
}

/* Chat Input Section */
.chat-input-container {
    padding: 16px 28px 24px;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-primary);
}

.api-notice {
    background-color: rgba(255, 159, 0, 0.1);
    border: 1px solid var(--warning);
    color: var(--warning);
    padding: 10px 12px;
    border-radius: 6px;
    font-size: 0.85em;
    margin-bottom: 12px;
    text-align: center;
}

.input-wrapper {
    display: flex;
    gap: 10px;
    margin-bottom: 8px;
}

.chat-input {
    flex: 1;
    padding: 12px 14px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 8px;
    font-family: 'Inter', sans-serif;
    font-size: 0.95em;
    resize: none;
    max-height: 120px;
    transition: border-color 0.2s;
}

.chat-input:focus {
    outline: none;
    border-color: var(--accent);
    background-color: var(--bg-tertiary);
}

.chat-input:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.send-btn {
    padding: 12px 20px;
    background-color: var(--accent);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
    white-space: nowrap;
}

.send-btn:hover:not(:disabled) {
    background-color: var(--accent-light);
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.input-footer {
    font-size: 0.75em;
    color: var(--text-tertiary);
    text-align: center;
}

/* ===== MODAL ===== */
.modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    z-index: 1001;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 1000;
}

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

.modal-header h2 {
    font-size: 1.3em;
}

.close-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5em;
    cursor: pointer;
    transition: color 0.2s;
}

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

.modal-body {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-height: 60vh;
    overflow-y: auto;
}

.setting-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.setting-item label {
    font-weight: 500;
    font-size: 0.95em;
}

.setting-input {
    padding: 10px 12px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 6px;
    font-family: 'Inter', sans-serif;
}

.setting-input:focus {
    outline: none;
    border-color: var(--accent);
}

.setting-item small {
    color: var(--text-tertiary);
    font-size: 0.8em;
}

.setting-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--accent);
}

.modal-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

.primary-btn {
    padding: 10px 20px;
    background-color: var(--accent);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

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

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        max-height: 40vh;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        position: absolute;
        left: 0;
        bottom: 0;
        z-index: 100;
        transform: translateY(100%);
    }

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

    .main-content {
        width: 100%;
        padding-bottom: 40vh;
    }

    .toggle-btn {
        display: block;
    }

    .main-header {
        padding: 16px;
    }

    .main-header h1 {
        font-size: 1.3em;
    }

    .quick-actions {
        padding: 12px 16px;
    }

    .chat-messages {
        padding: 16px;
    }

    .chat-input-container {
        padding: 12px 16px 16px;
    }

    .message-content {
        font-size: 0.9em;
    }

    .action-btn {
        font-size: 0.8em;
    }
}

@media (max-width: 480px) {
    .main-header h1 {
        font-size: 1.1em;
    }

    .tagline {
        font-size: 0.8em;
    }

    .quick-actions {
        gap: 6px;
    }

    .action-btn {
        padding: 6px 10px;
        font-size: 0.75em;
    }

    .chat-input {
        font-size: 0.9em;
    }

    .modal {
        width: 95%;
    }
}