/* Core Variables for Dark Theme */
:root {
    --bg-main: #0f0f0f;
    --bg-input: #212121;
    --bg-modal: #171717;
    --text-primary: #ececec;
    --text-secondary: #a0a0a0;
    --accent-color: #0f0;
    --hover-color: #2f2f2f;
    --border-color: #333;
    --group-title-color: #00ff00;
    --font-size-base: 16px;
    --button-bg: #ececec;
    --button-text: #0f0f0f;
    --theme-modal-bg: #171717;
    --theme-modal-text: #ececec;
    --error-color: #ff6b6b;
    --warning-color: #ffaa00;
    --stop-btn-bg: #ff4444;
    --bg-code-block: #1e1e1e;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    display: flex;
    height: 100vh;
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    overflow: hidden;
    position: relative;
}

.app-layout {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* 侧边栏 */
.sidebar {
    width: 260px;
    background: var(--bg-modal);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: transform 0.3s ease;
    z-index: 50;
}
.sidebar .new-chat-btn {
    margin: 15px;
    padding: 10px 15px;
    background: var(--button-bg);
    color: var(--button-text);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    font-size: 14px;
}
.sidebar .new-chat-btn:hover {
    opacity: 0.8;
}
.session-list {
    flex: 1;
    overflow-y: auto;
    padding: 0 10px 20px;
}
.session-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 12px;
    border-radius: 6px;
    cursor: pointer;
    margin-bottom: 4px;
    font-size: 14px;
    color: var(--text-secondary);
    transition: background 0.2s;
}
.session-item:hover {
    background: var(--hover-color);
}
.session-item.active {
    background: var(--bg-input);
    color: var(--text-primary);
}
.session-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.delete-sess-btn,
.edit-sess-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0 4px;
    display: none;
    font-size: 14px;
}
.session-item:hover .delete-sess-btn,
.session-item:hover .edit-sess-btn {
    display: inline-block;
}
.delete-sess-btn:hover {
    color: var(--error-color);
}
.edit-sess-btn:hover {
    color: var(--text-primary);
}
.close-sidebar-btn {
    display: none;
    margin: 10px;
    padding: 8px;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
}

/* 主聊天区域 */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    width: 100%;
    min-width: 0;
}

.messages-area {
    flex: 1;
    overflow-y: auto;
    padding: 40px 15%;
    padding-top: calc(40px + env(safe-area-inset-top, 0px));
    padding-bottom: calc(20px + env(safe-area-inset-bottom, 0px));
    display: flex;
    flex-direction: column;
    gap: 20px;
}
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-main); }
::-webkit-scrollbar-thumb { background: #333; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #555; }

.message {
    display: flex;
}
.ai-message {
    justify-content: flex-start;
}
.user-message {
    justify-content: flex-end;
}
.message-content {
    max-width: 80%;
    padding: 15px;
    border-radius: 12px;
    line-height: 1.5;
    word-wrap: break-word;
    color: var(--text-primary);
}
.ai-message .message-content {
    background-color: transparent;
}
.user-message .message-content {
    background-color: var(--bg-input);
}
.message-content img {
    max-width: 100%;
    border-radius: 8px;
}
.message-content pre code {
    background: var(--bg-code-block);
    padding: 12px;
    border-radius: 6px;
    display: block;
    overflow-x: auto;
}
.message-content code {
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 0.9em;
}

/* 表格样式（移动端滚动） */
.message-content table {
    border-collapse: collapse;
    width: 100%;
    margin: 15px 0;
    display: block;
    overflow-x: auto;
    border: 1px solid var(--border-color);
}
.message-content th,
.message-content td {
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    text-align: left;
    word-break: break-word;
    white-space: normal;
}

.input-area {
    padding: 20px 15%;
    padding-bottom: calc(20px + env(safe-area-inset-bottom, 0px));
    background-color: var(--bg-main);
}
.input-wrapper {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    background-color: var(--bg-input);
    border-radius: 16px;
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    gap: 8px;
}
.input-wrapper:focus-within {
    border-color: var(--text-secondary);
}
.top-row {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
}
.top-row #chat-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    resize: none;
    max-height: 200px;
    padding: 10px 4px;
    font-size: 16px;
    outline: none;
    overflow-y: auto;
}
.hidden-file-input {
    position: absolute;
    width: 0.1px;
    height: 0.1px;
    opacity: 0;
    overflow: hidden;
    z-index: -1;
}
.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 10px;
    border-radius: 8px;
    font-size: 16px;
    transition: background 0.2s;
}
.icon-btn:hover {
    color: var(--text-primary);
    background-color: var(--hover-color);
}
.send-btn {
    background-color: var(--text-primary);
    color: var(--bg-main);
    border-radius: 50%;
    padding: 6px 10px;
    font-size: 18px;
    line-height: 1;
    margin-bottom: 0;
}
.send-btn:hover {
    background-color: var(--text-secondary);
    color: var(--bg-main);
}

.input-divider {
    width: 100%;
    height: 1px;
    background-color: var(--border-color);
    margin: 2px 0;
}

.control-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    margin-bottom: 0;
    transition: all 0.2s;
    white-space: nowrap;
}
.control-btn:hover {
    background-color: var(--hover-color);
    color: var(--text-primary);
    border-color: var(--text-secondary);
}
.stop-btn {
    background-color: var(--stop-btn-bg) !important;
    color: white !important;
    border-color: var(--stop-btn-bg) !important;
}
.stop-btn:hover {
    background-color: var(--error-color) !important;
}

.save-btn, .control-btn {
    background-color: var(--button-bg);
    color: var(--button-text);
    border: 1px solid #555;
    transition: opacity 0.2s;
}
.save-btn:hover, .control-btn:hover {
    opacity: 0.8;
}
#reset-theme-btn {
    background-color: #555 !important;
    color: #ececec !important;
}

.control-group {
    display: flex;
    gap: 6px;
    align-items: center;
    flex-wrap: wrap;
}

.file-list {
    margin-top: 8px;
    padding: 4px 0;
}
.file-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 4px 10px;
    background: var(--bg-input);
    border-radius: 8px;
    margin-bottom: 5px;
    font-size: 14px;
}
.file-item .file-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.file-item .remove-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0 4px;
}
.file-item .remove-btn:hover {
    color: var(--error-color);
}

.security-note {
    font-size: 12px;
    color: var(--warning-color);
    margin-top: 10px;
    text-align: center;
}

select optgroup {
    color: var(--group-title-color) !important;
    font-weight: bold;
}
select option {
    color: var(--text-primary) !important;
    background-color: var(--bg-main);
}

.message-content {
    color: var(--text-primary);
}

.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.85);
    justify-content: center;
    align-items: center;
    z-index: 100;
}
.modal {
    background-color: var(--bg-modal);
    padding: 30px;
    border-radius: 12px;
    width: 480px;
    max-width: 90%;
    border: 1px solid var(--border-color);
    position: relative;
    max-height: 90vh;
    overflow-y: auto;
}
.theme-modal-content {
    background-color: var(--theme-modal-bg) !important;
    color: var(--theme-modal-text) !important;
}
.theme-modal-content label {
    color: var(--theme-modal-text) !important;
}
.theme-modal-content input {
    background: var(--bg-input) !important;
    color: var(--theme-modal-text) !important;
    border: 1px solid var(--border-color) !important;
}

.info-section {
    margin-bottom: 15px;
}
.info-section h3 {
    font-size: 15px;
    color: var(--text-primary);
    margin-bottom: 5px;
}
.info-section p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}
.info-modal-content a {
    color: var(--accent-color);
    text-decoration: none;
}
.info-modal-content a:hover {
    text-decoration: underline;
}
.close-info-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 16px;
}
.close-info-btn:hover {
    color: var(--text-primary);
}

.form-group {
    margin-bottom: 20px;
}
.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
}
.form-group input[type="text"],
.form-group input[type="password"] {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-main);
    color: var(--text-primary);
    outline: none;
}
.form-group input:focus {
    border-color: var(--text-secondary);
}
.radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 25px;
}
.radio-group label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-primary);
    cursor: pointer;
    margin-bottom: 0;
    line-height: 1;
}
.radio-group input[type="radio"] {
    margin: 0;
    cursor: pointer;
}

.save-btn {
    width: 100%;
    padding: 12px;
    background-color: var(--text-primary);
    color: var(--bg-main);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    font-size: 16px;
    margin-top: 10px;
}
.save-btn:hover {
    background-color: var(--text-secondary);
}

/* 移动端适配 */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100%;
        transform: translateX(-100%);
        width: 280px;
        box-shadow: 2px 0 10px rgba(0,0,0,0.5);
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .close-sidebar-btn {
        display: block;
    }
    .menu-btn {
        display: inline-block !important;
    }
    .messages-area, .input-area {
        padding-left: 10px;
        padding-right: 10px;
    }
    .input-wrapper {
        flex-direction: column;
        align-items: stretch;
        padding: 10px;
        gap: 8px;
    }
    .input-divider {
        width: 100%;
        height: 1px;
        margin: 2px 0;
    }
    .top-row {
        width: 100%;
    }
    .top-row #chat-input {
        font-size: 16px;
        min-width: 80px;
    }
    .control-group {
        width: 100%;
        justify-content: space-around;
        margin-top: 4px;
        gap: 4px;
    }
    .control-btn {
        font-size: 12px;
        padding: 5px 8px;
        white-space: nowrap;
    }
    .model-status-bar {
        flex-wrap: wrap;
        gap: 6px;
        font-size: 13px;
        padding-top: env(safe-area-inset-top, 0px);
    }
    .model-status-bar select {
        max-width: 150px;
        font-size: 13px;
    }
    .file-item {
        font-size: 12px;
        padding: 3px 8px;
    }
    .session-item .delete-sess-btn,
    .session-item .edit-sess-btn {
        display: inline-block;
        opacity: 0.6;
    }
    .session-item .delete-sess-btn:hover,
    .session-item .edit-sess-btn:hover {
        opacity: 1;
    }
}