/* ============================================================
   AI 科研绘图 - 品牌蓝设计语言
   ============================================================ */

:root {
    --bg: #ffffff;
    --bg-subtle: #f7f9fd;
    --border: #e6ebf4;
    --text: #1c2433;
    --text-secondary: #5c6678;
    --text-muted: #97a0b3;
    --accent: #2f6bff;
    --accent-hover: #1f56e0;
    --brand-light: #eef4ff;
    --radius-sm: 10px;
    --radius-md: 18px;
    --shadow-input: 0 2px 6px rgba(0,0,0,0.06);
    --transition: 0.15s ease;
}

/* ---- 模板主内容区（满屏工作区） ---- */
.main {
    padding: 0;
    height: 100%;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    min-width: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ---- 兑换码弹窗 ---- */
.redeem-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.55);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn .18s ease;
}

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

.redeem-modal {
    background: #fff;
    border-radius: 16px;
    padding: 30px 30px 24px;
    width: 400px;
    max-width: 92vw;
    box-shadow: 0 8px 40px rgba(0,0,0,0.18);
    animation: modalIn .2s ease;
}

@keyframes modalIn { from { opacity: 0; transform: translateY(10px) scale(0.97); } to { opacity: 1; transform: translateY(0) scale(1); } }

.redeem-modal-title {
    font-size: 18px;
    font-weight: 650;
    color: var(--text);
    margin-bottom: 4px;
}

.redeem-modal-desc {
    font-size: 13px;
    color: #999;
    margin-bottom: 20px;
}

.redeem-modal-input-row {
    display: flex; gap: 10px;
}

.redeem-modal-input {
    flex: 1;
    padding: 11px 14px;
    border: 1px solid #e0e0e0;
    border-radius: 10px;
    font-size: 14px;
    font-family: 'Courier New', monospace;
    letter-spacing: 1px;
    outline: none;
    transition: border-color .15s;
}

.redeem-modal-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(47,107,255,.1);
}

.redeem-modal-input::placeholder {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    letter-spacing: 0;
}

.redeem-modal-btn {
    padding: 11px 26px;
    border: none; border-radius: 999px;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    color: #fff;
    font-size: 14px; font-weight: 600; cursor: pointer;
    box-shadow: 0 4px 14px rgba(47,107,255,.28);
    transition: all .15s; flex-shrink: 0;
}

.redeem-modal-btn:hover { filter: brightness(1.06); box-shadow: 0 6px 18px rgba(47,107,255,.36); }
.redeem-modal-btn:disabled { opacity: 0.5; cursor: not-allowed; box-shadow: none; }

.redeem-modal-status {
    margin-top: 14px;
    font-size: 13px;
    min-height: 20px;
}

.redeem-modal-status.valid { color: var(--accent); }
.redeem-modal-status.invalid { color: #e53e3e; }
.redeem-modal-status.checking { color: #f59e0b; }

.redeem-modal-footer {
    margin-top: 18px; padding-top: 14px;
    border-top: 1px solid #f0f0f0;
    display: flex; justify-content: space-between; align-items: center;
}

.redeem-modal-footer a {
    font-size: 12px; color: var(--accent); text-decoration: none;
}

.redeem-modal-footer a:hover { text-decoration: underline; }

.redeem-modal-cancel {
    font-size: 13px; color: #999; background: none; border: none;
    cursor: pointer; padding: 4px 8px;
}

.redeem-modal-cancel:hover { color: #666; }

/* ---- 对话区域 ---- */
.chat-area {
    flex: 1;
    overflow-y: auto;
    scroll-behavior: smooth;
}

.chat-area::-webkit-scrollbar {
    width: 5px;
}
.chat-area::-webkit-scrollbar-thumb {
    background: #c9d4ea;
    border-radius: 10px;
}
.chat-area::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

/* ---- 欢迎页 ---- */
.chat-welcome {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 24px 40px;
    text-align: center;
}

.chat-welcome.hidden {
    display: none;
}

.welcome-icon {
    margin-bottom: 20px;
}

.welcome-icon svg {
    display: block;
}

.chat-welcome h2 {
    font-size: 26px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 8px;
    letter-spacing: -0.3px;
}

.chat-welcome p {
    font-size: 14px;
    color: var(--text-secondary);
    max-width: 320px;
}

/* ---- 对话头部 ---- */
.chat-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 40px;
    border-bottom: 1px solid var(--border);
    background: #fff;
    position: sticky;
    top: 0;
    z-index: 10;
}

.chat-header-avatar {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    object-fit: cover;
}

.chat-header-name {
    font-size: 14px;
    font-weight: 550;
    color: var(--text);
}

/* ---- 消息列表 ---- */
.chat-messages {
    display: flex;
    flex-direction: column;
}

/* ---- 单条消息 ---- */
.chat-msg {
    display: flex;
    gap: 14px;
    padding: 20px 40px;
    align-items: flex-start;
}

.chat-msg:nth-child(even) {
    background: var(--bg-subtle);
}

.chat-msg.user {
    flex-direction: row-reverse;
}

/* 头像 */
.msg-avatar {
    width: 30px;
    height: 30px;
    border-radius: 4px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.msg-avatar img {
    width: 30px;
    height: 30px;
    object-fit: cover;
    display: block;
}

.chat-msg.user .msg-body {
    text-align: right;
}

/* 消息内容 */
.msg-body {
    flex: 1;
    min-width: 0;
    padding-top: 2px;
}

.msg-text {
    font-size: 13px;
    line-height: 1.6;
    color: var(--text);
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* 图片区域 */
.msg-images {
    margin-top: 12px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.msg-image {
    max-width: 100%;
    max-height: 260px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    border: 1px solid var(--border);
    transition: all var(--transition);
    object-fit: contain;
}

.msg-image:hover {
    opacity: 0.85;
    box-shadow: 0 4px 16px rgba(47,107,255,.14);
}

/* 错误 */
.msg-error {
    margin-top: 8px;
    padding: 10px 14px;
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: var(--radius-sm);
    color: #dc2626;
    font-size: 13px;
}

/* 加载动画 */
.msg-loading {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-muted);
}

.msg-loading .dot-flash {
    display: inline-flex;
    gap: 3px;
}

.msg-loading .dot-flash span {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--text-muted);
    animation: dotPulse 1.4s ease-in-out infinite;
}

.msg-loading .dot-flash span:nth-child(2) { animation-delay: 0.2s; }
.msg-loading .dot-flash span:nth-child(3) { animation-delay: 0.4s; }

@keyframes dotPulse {
    0%, 80%, 100% { opacity: 0.2; transform: scale(0.7); }
    40% { opacity: 1; transform: scale(1); }
}

/* 消息操作按钮 */
.msg-actions {
    display: flex;
    gap: 10px;
    margin-top: 12px;
}

.msg-actions button {
    padding: 5px 14px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: #fff;
    font-size: 12px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}

.msg-actions button:hover {
    background: var(--brand-light);
    border-color: var(--accent);
    color: var(--accent);
}

/* ---- 底部输入区 ---- */
.input-wrapper {
    background: var(--bg);
    padding: 20px 24px 16px;
}

/* 模式切换按钮 */
.mode-row {
    display: flex;
    gap: 8px;
    padding: 0 0 10px;
    align-items: center;
}

.quick-links {
    margin-left: auto;
    display: flex;
    gap: 8px;
    align-items: center;
}

.quick-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 14px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: #fff;
    font-size: 12px;
    color: var(--text-secondary);
    text-decoration: none;
    white-space: nowrap;
    transition: all var(--transition);
}

.quick-link:hover {
    background: var(--brand-light);
    border-color: var(--accent);
    color: var(--accent);
}

.mode-btn {
    padding: 6px 18px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: #fff;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}

.mode-btn:hover {
    background: var(--brand-light);
    border-color: var(--accent);
    color: var(--accent);
}

.mode-btn.active {
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    color: #fff;
    border-color: transparent;
    box-shadow: 0 3px 10px rgba(47,107,255,.28);
}

/* 图片上传 chips */
.upload-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
    padding: 2px 0 6px 0;
}

.upload-add-btn {
    padding: 5px 14px;
    border: 1px dashed rgba(47,107,255,.45);
    border-radius: 999px;
    background: var(--brand-light);
    font-size: 12px;
    color: var(--accent);
    cursor: pointer;
    transition: all var(--transition);
}

.upload-add-btn:hover {
    border-color: var(--accent);
    background: #e3edff;
    color: var(--accent-hover);
}

.upload-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 3px 3px 3px 10px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: #f7f9fd;
    font-size: 12px;
    color: var(--text);
}

.upload-chip img {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    object-fit: cover;
}

.upload-chip .chip-remove {
    width: 18px;
    height: 18px;
    border: none;
    border-radius: 50%;
    background: #d4d4d4;
    color: #fff;
    cursor: pointer;
    font-size: 11px;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    transition: background var(--transition);
}

.upload-chip .chip-remove:hover {
    background: #ef4444;
}

/* 输入框 */
.input-row {
    padding: 0;
}

.input-box {
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 4px 6px 6px 10px;
    background: #fff;
    transition: all var(--transition);
    box-shadow: 0 1px 3px rgba(31,66,138,.05);
}

.input-box:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(47,107,255,.1);
}

.input-inner {
    display: flex;
    align-items: flex-end;
}

.chat-input {
    flex: 1;
    border: none;
    outline: none;
    resize: none;
    font-size: 15px;
    line-height: 1.5;
    color: var(--text);
    background: transparent;
    font-family: inherit;
    padding: 4px 0;
    min-height: 100px;
    max-height: 200px;
    overflow-y: auto;
}

.chat-input::placeholder {
    color: #b0b0b0;
}

.chat-input::-webkit-scrollbar {
    width: 4px;
}

.send-btn {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(47,107,255,.3);
    transition: all var(--transition);
    flex-shrink: 0;
}

.send-btn:hover {
    filter: brightness(1.06);
    box-shadow: 0 6px 16px rgba(47,107,255,.38);
}

.send-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.send-btn.loading svg {
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 参数行 */
.param-row {
    display: flex;
    gap: 8px;
    padding: 10px 0 6px;
    flex-wrap: wrap;
}

.param-item {
    display: flex;
    align-items: center;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: #fff;
    overflow: visible;
    transition: all var(--transition);
    position: relative;
    user-select: none;
}

.param-item:hover {
    border-color: var(--accent);
}

.param-item.open {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(47,107,255,.1);
}

.param-label {
    font-size: 11.5px;
    color: var(--text-muted);
    white-space: nowrap;
    padding: 6px 6px 6px 14px;
    font-weight: 500;
    pointer-events: none;
}

.param-trigger {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 6px 14px 6px 2px;
    cursor: pointer;
    font-size: 12.5px;
    font-weight: 450;
    color: var(--text);
    white-space: nowrap;
}

.param-trigger svg {
    flex-shrink: 0;
    opacity: 0.5;
    transition: transform var(--transition);
}

.param-item.open .param-trigger svg {
    transform: rotate(180deg);
    opacity: 0.7;
}

.param-select {
    display: none;
}

/* 下拉面板 */
.param-dropdown {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    min-width: 100%;
    max-height: 260px;
    overflow-y: auto;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(31,66,138,.12);
    padding: 6px;
    z-index: 100;
    display: none;
    animation: ddIn 0.15s ease;
}

.param-dropdown.up {
    top: auto;
    bottom: calc(100% + 6px);
    animation: ddInUp 0.15s ease;
}

.param-dropdown.show {
    display: block;
}

@keyframes ddIn {
    from { opacity: 0; transform: translateY(-4px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes ddInUp {
    from { opacity: 0; transform: translateY(4px); }
    to   { opacity: 1; transform: translateY(0); }
}

.param-option {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 7px 12px;
    border: none;
    border-radius: 8px;
    background: transparent;
    font-size: 13px;
    font-weight: 450;
    color: var(--text);
    cursor: pointer;
    font-family: inherit;
    transition: background var(--transition);
    white-space: nowrap;
}

.param-option .ratio-box {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.param-option .ratio-box svg {
    display: block;
}

.param-option:hover {
    background: var(--brand-light);
    color: var(--accent);
}

.param-option.selected {
    background: var(--brand-light);
    color: var(--accent);
    font-weight: 600;
}

.param-trigger .ratio-box {
    width: 20px;
    height: 20px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    vertical-align: middle;
    margin-right: 4px;
}

.param-trigger .ratio-box svg {
    display: block;
}

.param-trigger-text {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

/* 底部免责 */
.input-footer {
    text-align: center;
    padding: 6px 0 0;
    font-size: 11px;
    color: #c8c8c8;
}

/* ---- 图片预览弹窗 ---- */
.lightbox {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.92);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

.lightbox img {
    max-width: 90vw;
    max-height: 82vh;
    object-fit: contain;
    border-radius: 6px;
}

.lightbox-close {
    position: absolute;
    top: 18px;
    right: 28px;
    font-size: 34px;
    color: #fff;
    cursor: pointer;
    opacity: 0.7;
    line-height: 1;
    transition: opacity var(--transition);
}

.lightbox-close:hover { opacity: 1; }

.lightbox-actions { margin-top: 20px; }

.lightbox-actions button {
    padding: 9px 28px;
    border: none;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(47,107,255,.3);
    transition: all var(--transition);
}

.lightbox-actions button:hover {
    filter: brightness(1.08);
    transform: translateY(-1px);
}

/* ---- 响应式 ---- */
@media (max-width: 768px) {
    .chat-header {
        padding: 12px 16px;
    }

    .chat-msg {
        padding: 20px 16px;
        gap: 12px;
    }

    .chat-welcome {
        padding: 40px 12px 30px;
    }

    .chat-welcome h2 {
        font-size: 22px;
    }

    .input-wrapper {
        padding: 10px 10px 8px;
    }
}