/* ============================================================
   AI智库 子站 - 手机端优化样式
   ============================================================ */

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

:root {
    --bg: #f8f9fa;
    --card: #ffffff;
    --text: #1d1d1f;
    --text-secondary: #6e6e73;
    --text-tertiary: #86868b;
    --primary: #4f8cff;
    --primary-light: #e8f0ff;
    --border: #e5e5ea;
    --shadow: 0 1px 3px rgba(0,0,0,.06);
    --radius: 12px;
    --radius-sm: 8px;
    --safe-bottom: env(safe-area-inset-bottom, 16px);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

.app {
    max-width: 480px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ---- 头部 ---- */
.header {
    padding: 20px 16px 12px;
    text-align: center;
    background: var(--card);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.header-top {
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.btn-back {
    position: absolute;
    left: 0;
    background: none;
    border: none;
    color: var(--primary);
    cursor: pointer;
    padding: 4px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-back:active {
    background: var(--primary-light);
}

.header-spacer {
    position: absolute;
    right: 0;
    width: 28px;
}

.logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.3px;
}

.logo-sup {
    font-size: 13px;
    font-weight: 500;
    color: var(--primary);
    margin-left: 2px;
    vertical-align: super;
}

.subtitle {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-top: 4px;
}

/* ---- 角色导航 ---- */
.persona-nav {
    background: var(--card);
    border-bottom: 1px solid var(--border);
    padding: 10px 0;
    position: sticky;
    top: 81px;
    z-index: 9;
    overflow: hidden;
}

.persona-list {
    display: flex;
    gap: 8px;
    padding: 0 16px;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
    -webkit-overflow-scrolling: touch;
}

.persona-list::-webkit-scrollbar {
    display: none;
}

.persona-chip {
    flex-shrink: 0;
    padding: 7px 14px;
    border-radius: 20px;
    border: 1.5px solid var(--border);
    background: var(--card);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all .2s;
    white-space: nowrap;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.persona-chip:active {
    transform: scale(.96);
}

.persona-chip.selected {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

.persona-chip.style-tag::after {
    content: attr(data-tag);
    display: inline-block;
    font-size: 10px;
    padding: 1px 6px;
    border-radius: 8px;
    background: rgba(79,140,255,.12);
    color: var(--primary);
    margin-left: 6px;
    font-weight: 400;
}

.persona-chip.selected.style-tag::after {
    background: rgba(255,255,255,.25);
    color: #fff;
}

/* ---- 主页 ---- */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.home-view {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 16px;
}

.mode-cards {
    display: flex;
    flex-direction: column;
    gap: 14px;
    width: 100%;
    max-width: 360px;
}

.mode-card {
    background: var(--card);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    text-align: left;
    cursor: pointer;
    transition: all .2s;
    box-shadow: var(--shadow);
    -webkit-tap-highlight-color: transparent;
}

.mode-card:active {
    transform: scale(.98);
    border-color: var(--primary);
}

.mode-icon {
    font-size: 28px;
    margin-bottom: 8px;
}

.mode-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
}

.mode-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* ---- 对话视图 ---- */
.chat-view {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    -webkit-overflow-scrolling: touch;
}

.chat-messages:empty::after {
    content: '选择角色后开始对话';
    display: block;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 14px;
    margin-top: 60px;
}

/* 消息气泡 */
.msg {
    max-width: 85%;
    animation: msgIn .3s ease;
}

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

.msg.user {
    align-self: flex-end;
}

.msg.assistant {
    align-self: flex-start;
}

.msg-bubble {
    padding: 10px 14px;
    border-radius: 16px;
    font-size: 14px;
    line-height: 1.6;
    word-break: break-word;
}

.msg.user .msg-bubble {
    background: var(--primary);
    color: #fff;
    border-bottom-right-radius: 4px;
}

.msg.assistant .msg-bubble {
    background: var(--card);
    border: 1px solid var(--border);
    border-bottom-left-radius: 4px;
    box-shadow: var(--shadow);
}

.msg-label {
    font-size: 11px;
    color: var(--text-tertiary);
    margin-bottom: 4px;
    padding: 0 4px;
}

.msg.user .msg-label {
    text-align: right;
}

.msg.assistant .msg-label {
    text-align: left;
}

/* 流式输出光标 */
.streaming-cursor::after {
    content: '▊';
    animation: blink 1s step-end infinite;
    color: var(--primary);
}

@keyframes blink {
    50% { opacity: 0; }
}

/* ---- 输入区 ---- */
.chat-input-area {
    padding: 12px 16px;
    padding-bottom: var(--safe-bottom);
    background: var(--card);
    border-top: 1px solid var(--border);
    position: sticky;
    bottom: 0;
}

.chat-input-row {
    display: flex;
    gap: 8px;
    align-items: center;
}

.chat-input {
    flex: 1;
    padding: 10px 14px;
    border: 1.5px solid var(--border);
    border-radius: 24px;
    font-size: 14px;
    outline: none;
    background: var(--bg);
    color: var(--text);
    transition: border-color .2s;
}

.chat-input:focus {
    border-color: var(--primary);
}

.btn-send {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: var(--primary);
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: opacity .2s;
}

.btn-send:active {
    opacity: .8;
}

.btn-send:disabled {
    opacity: .4;
    cursor: not-allowed;
}

/* ---- 写文章视图 ---- */
.compose-view {
    flex: 1;
    padding: 20px 16px;
    overflow-y: auto;
}

.compose-form {
    background: var(--card);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.compose-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
    margin-top: 16px;
}

.compose-label:first-child {
    margin-top: 0;
}

.compose-topic {
    width: 100%;
    padding: 10px 14px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    outline: none;
    background: var(--bg);
    color: var(--text);
    transition: border-color .2s;
}

.compose-topic:focus {
    border-color: var(--primary);
}

.length-options {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.length-opt {
    font-size: 13px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
}

.length-opt input[type="radio"] {
    accent-color: var(--primary);
}

.btn-compose {
    width: 100%;
    margin-top: 20px;
    padding: 12px;
    border: none;
    border-radius: var(--radius-sm);
    background: var(--primary);
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity .2s;
}

.btn-compose:active {
    opacity: .8;
}

.btn-compose:disabled {
    opacity: .4;
    cursor: not-allowed;
}

/* 创作结果 */
.compose-result {
    margin-top: 20px;
}

.compose-article {
    background: var(--card);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

/* Markdown 渲染 */
.markdown-body {
    font-size: 15px;
    line-height: 1.8;
    color: var(--text);
    word-break: break-word;
}

.markdown-body h2 {
    font-size: 18px;
    font-weight: 700;
    margin: 24px 0 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}

.markdown-body h3 {
    font-size: 16px;
    font-weight: 600;
    margin: 20px 0 10px;
}

.markdown-body p {
    margin: 10px 0;
}

.markdown-body strong {
    color: #1d1d1f;
    font-weight: 700;
}

.markdown-body code {
    background: #f0f0f5;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
    color: #d63384;
    font-family: "SF Mono", "Menlo", monospace;
}

.markdown-body blockquote {
    border-left: 3px solid var(--primary);
    padding: 8px 14px;
    margin: 12px 0;
    background: var(--primary-light);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--text-secondary);
    font-size: 14px;
}

.markdown-body ul, .markdown-body ol {
    padding-left: 20px;
    margin: 10px 0;
}

.markdown-body li {
    margin: 4px 0;
}

.markdown-body hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 20px 0;
}

.markdown-body pre {
    background: #1d1d1f;
    color: #e5e5ea;
    padding: 14px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    font-size: 13px;
    line-height: 1.5;
    margin: 12px 0;
}

.markdown-body pre code {
    background: none;
    color: inherit;
    padding: 0;
    font-size: inherit;
}

/* ---- 加载遮罩 ---- */
.loading-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(255,255,255,.85);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.loading-spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin .8s linear infinite;
}

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

.loading-text {
    margin-top: 12px;
    font-size: 14px;
    color: var(--text-secondary);
}

/* ---- Toast ---- */
.toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: #1d1d1f;
    color: #fff;
    padding: 10px 20px;
    border-radius: 20px;
    font-size: 13px;
    z-index: 200;
    opacity: 0;
    pointer-events: none;
    transition: opacity .3s;
}

.toast.show {
    opacity: 1;
}

/* ---- 响应式 ---- */
@media (min-width: 481px) {
    .app {
        border-left: 1px solid var(--border);
        border-right: 1px solid var(--border);
    }
}

/* ---- 登录遮罩 ---- */
.login-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    transition: opacity .3s, visibility .3s;
}

.login-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.login-card {
    background: var(--card);
    border-radius: 16px;
    padding: 36px 24px 28px;
    width: 100%;
    max-width: 360px;
    box-shadow: 0 4px 24px rgba(0,0,0,.08);
    text-align: center;
}

.login-logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}

.login-desc {
    font-size: 14px;
    color: var(--text-tertiary);
    margin-bottom: 24px;
}

.login-input-row {
    display: flex;
    gap: 8px;
    align-items: center;
}

.login-input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: 12px;
    font-size: 16px;
    outline: none;
    background: var(--bg);
    color: var(--text);
    transition: border-color .2s;
}

.login-input:focus {
    border-color: var(--primary);
}

.btn-login {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    border: none;
    background: var(--primary);
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: opacity .2s;
}

.btn-login:active {
    opacity: .8;
}

.login-error {
    color: #e74c3c;
    font-size: 13px;
    margin-top: 12px;
    text-align: left;
}

/* ---- 管理页 ---- */
.admin-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: var(--bg);
}

.admin-card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 32px 24px;
    width: 100%;
    max-width: 360px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.admin-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    text-align: center;
}

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

.admin-input {
    width: 100%;
    padding: 12px 14px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 15px;
    outline: none;
    background: var(--bg);
    margin-bottom: 16px;
    transition: border-color .2s;
}

.admin-input:focus {
    border-color: var(--primary);
}

.btn-admin {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 10px;
    background: var(--primary);
    color: #fff;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: opacity .2s;
}

.btn-admin:active {
    opacity: .8;
}

.btn-admin:disabled {
    opacity: .4;
    cursor: not-allowed;
}

.admin-msg {
    margin-top: 12px;
    font-size: 13px;
    text-align: center;
}

.admin-msg.success {
    color: #27ae60;
}

.admin-msg.error {
    color: #e74c3c;
}