* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root {
    --bg: #ffffff;
    --card-bg: #f8f8f8;
    --border: #e0e0e0;
    --text: #1a1a1a;
    --text-secondary: #6b6b6b;
    --input-bg: #f5f5f5;
    --accent-password: #ff6600;
    --user-msg-bg: #2c2c2c;
    --ai-msg-bg: #f0f0f0;
    --hover-bg: rgba(0, 0, 0, 0.05);
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    --send-btn-bg: #2c2c2c;
    --send-btn-hover: #1a1a1a;
}

body {
    font-family:
        "Inter",
        system-ui,
        -apple-system,
        "Segoe UI",
        Roboto,
        sans-serif;
    background: var(--bg);
    color: var(--text);
    /* 确保 body 铺满整个视口 */
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: var(--bg);
    /* 安全区域边距仅用于避免刘海遮挡，由内部容器处理滚动 */
}

.app-container {
    /* 占满视口，flex 列布局 */
    flex: 1;
    display: flex;
    flex-direction: column;
    max-width: 1000px;
    width: 100%;
    margin: 0 auto;
    background: var(--bg);
    overflow: hidden;
    border: none;
    box-shadow: none;
    /* 移动端全屏时移除圆角和边框 */
}

/* 桌面端保留边距和圆角，但依然固定头部和底部 */
@media (min-width: 1025px) {
    body {
        padding: 1rem;
    }
    .app-container {
        border-radius: 1.5rem;
        border: 1px solid var(--border);
        box-shadow: var(--shadow);
        max-height: 90vh;
    }
}

/* 移动端全屏，无外边距，占满整个视口 */
@media (max-width: 1024px) {
    body {
        padding: 0;
    }
    .app-container {
        border-radius: 0;
        border: none;
        width: 100%;
        height: 100vh; /* 关键：强制占满视口 */
        max-height: 100vh;
    }
}

/* 安全区适配：给容器添加内边距补偿，避免内容被刘海遮挡 */
@supports (padding: max(0px)) {
    body {
        padding-top: env(safe-area-inset-top);
        padding-bottom: env(safe-area-inset-bottom);
        padding-left: env(safe-area-inset-left);
        padding-right: env(safe-area-inset-right);
    }
    @media (max-width: 1024px) {
        .app-container {
            height: calc(
                100vh - env(safe-area-inset-top) - env(safe-area-inset-bottom)
            );
            min-height: 0;
        }
    }
}

/* 头部固定（不滚动） */
.brand-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
    background: var(--bg);
    flex-shrink: 0; /* 防止压缩 */
}

.brand-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.logo svg {
    width: 40px;
    height: 40px;
    display: block;
}
.brand-title {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text);
    letter-spacing: -0.2px;
}
.clear-btn {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 2rem;
    padding: 0.3rem 0.8rem;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: all 0.2s;
}
.clear-btn:hover {
    border-color: var(--text-secondary);
    background: var(--hover-bg);
    color: var(--text);
}
.clear-btn .material-icons {
    font-size: 1rem;
    color: inherit;
}

/* 模式栏（也是固定头部的一部分） */
.mode-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}
.mode-btn,
.advanced-btn {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 2rem;
    padding: 0.4rem 1rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
}
.mode-btn .material-icons,
.advanced-btn .material-icons {
    font-size: 1.1rem;
    color: var(--text-secondary);
}
.mode-btn.active {
    background: #2c2c2c;
    color: white;
    border-color: #2c2c2c;
}
.mode-btn.active .material-icons {
    color: white;
}
.advanced-dropdown {
    position: relative;
}
.dropdown-menu {
    position: absolute;
    right: 0;
    top: calc(100% + 4px);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 1rem;
    overflow: hidden;
    min-width: 160px;
    z-index: 100;
    display: none;
    flex-direction: column;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}
.dropdown-menu.show {
    display: flex;
}
.dropdown-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0.6rem 1rem;
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--text);
    cursor: pointer;
    transition: background 0.1s;
}
.dropdown-item .material-icons {
    font-size: 1rem;
    color: var(--text-secondary);
}
.dropdown-item:hover {
    background: var(--hover-bg);
}

/* 聊天主体区域：flex 列，中间消息区域可滚动 */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg);
}
.messages-area {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    scroll-behavior: smooth;
}
.message {
    display: flex;
    flex-direction: column;
    max-width: 85%;
}
.message.user {
    align-self: flex-end;
}
.message.ai {
    align-self: flex-start;
}
.msg-bubble {
    padding: 0.75rem 1rem;
    border-radius: 1.5rem;
    line-height: 1.4;
    font-size: 0.9rem;
    font-weight: 400;
    word-break: break-word;
}
.user .msg-bubble {
    background: var(--user-msg-bg);
    color: #fff;
    border-bottom-right-radius: 0.25rem;
}
.ai .msg-bubble {
    background: var(--ai-msg-bg);
    border: 1px solid var(--border);
    border-bottom-left-radius: 0.25rem;
    color: var(--text);
}
.msg-time {
    font-size: 0.7rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-top: 0.25rem;
    padding: 0 0.5rem;
}

/* 身份卡片样式 */
.identity-card {
    background: var(--card-bg);
    border-radius: 1rem;
    padding: 1rem;
    margin-top: 0.5rem;
    border: 1px solid var(--border);
}
.card-row {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-family: "SF Mono", "Fira Code", monospace;
    font-size: 0.8rem;
    font-weight: 400;
    padding: 0.4rem 0;
    border-bottom: 1px dashed var(--border);
}
.card-label {
    color: var(--text-secondary);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
}
.card-label .material-icons {
    font-size: 1rem;
    color: var(--text-secondary);
}
.card-value {
    word-break: break-all;
    text-align: right;
    color: var(--text);
    font-weight: 400;
}
.card-value.password {
    color: var(--accent-password);
    font-weight: 600;
}
.save-card-btn {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 2rem;
    padding: 0.3rem 0.8rem;
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    margin-top: 0.6rem;
    width: fit-content;
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: all 0.2s;
}
.save-card-btn .material-icons {
    font-size: 0.9rem;
    color: inherit;
}
.save-card-btn:hover {
    background: var(--hover-bg);
    border-color: var(--text-secondary);
    color: var(--text);
}

/* 底部输入框固定 */
.input-area {
    padding: 1rem;
    border-top: 1px solid var(--border);
    background: var(--bg);
    display: flex;
    gap: 0.75rem;
    flex-shrink: 0; /* 防止压缩 */
}
.input-area input {
    flex: 1;
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 2rem;
    padding: 0.7rem 1rem;
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--text);
    outline: none;
    transition: 0.2s;
}
.input-area input:focus {
    border-color: var(--text-secondary);
    box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.05);
}
.input-area button {
    background: var(--send-btn-bg);
    border: none;
    border-radius: 2rem;
    padding: 0 1.2rem;
    font-weight: 600;
    font-size: 0.85rem;
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: 0.2s;
}
.input-area button .material-icons {
    font-size: 1rem;
    color: #fff;
}
.input-area button:hover {
    background: var(--send-btn-hover);
}

/* 滚动条 */
::-webkit-scrollbar {
    width: 4px;
}
::-webkit-scrollbar-track {
    background: var(--border);
}
::-webkit-scrollbar-thumb {
    background: #b0b0b0;
    border-radius: 4px;
}
.material-icons {
    vertical-align: middle;
}
button,
.dropdown-item,
.save-card-btn {
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

/* 响应式调整字号等 */
@media (max-width: 1024px) {
    .brand-title {
        font-size: 1.2rem;
    }
    .mode-btn,
    .advanced-btn {
        padding: 0.3rem 0.7rem;
        font-size: 0.75rem;
    }
    .mode-btn .material-icons,
    .advanced-btn .material-icons {
        font-size: 1rem;
    }
    .msg-bubble {
        font-size: 0.85rem;
    }
    .card-row {
        font-size: 0.75rem;
    }
    .identity-card {
        padding: 0.8rem;
    }
}
@media (max-width: 640px) {
    .message {
        max-width: 90%;
    }
    .brand-left {
        gap: 0.5rem;
    }
    .logo svg {
        width: 32px;
        height: 32px;
    }
    .brand-title {
        font-size: 1rem;
    }
    .clear-btn span:last-child {
        display: none;
    }
    .clear-btn {
        padding: 0.3rem;
    }
}