/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 能量配色 - 激励型 */
    --bg-primary: #0A0E27;
    --bg-secondary: #1A1F3A;
    --bg-card: linear-gradient(135deg, #161B33 0%, #1A1F3A 100%);

    /* 文字 */
    --text-primary: #FFFFFF;
    --text-secondary: #B8C5D6;
    --text-muted: #6B7A94;

    /* 能量强调色 */
    --energy-orange: #FF6B35;
    --energy-orange-glow: rgba(255, 107, 53, 0.3);
    --lime-green: #06FFA5;
    --lime-green-glow: rgba(6, 255, 165, 0.25);

    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #FF6B35 0%, #F77F00 100%);
    --gradient-success: linear-gradient(135deg, #06FFA5 0%, #00D9A5 100%);

    /* 边框与阴影 */
    --border: rgba(255, 255, 255, 0.08);
    --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-button: 0 4px 12px var(--energy-orange-glow);

    /* 安全区域 */
    --safe-top: env(safe-area-inset-top);
    --safe-bottom: env(safe-area-inset-bottom);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
                 'Microsoft YaHei', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow: hidden;
    position: relative;
}

/* 背景动感纹理 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 50%, var(--energy-orange-glow) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, var(--lime-green-glow) 0%, transparent 50%);
    opacity: 0.3;
    pointer-events: none;
    z-index: 0;
}

/* 主容器 */
#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh; /* 动态视口高度 */
    position: relative;
    z-index: 1;
}

/* 顶部栏 */
#header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    padding-top: calc(16px + var(--safe-top));
    background: rgba(26, 31, 58, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

#page-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.icon-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: rgba(255, 255, 255, 0.1);
    color: var(--lime-green);
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    backdrop-filter: blur(10px);
}

.icon-btn:active {
    background: rgba(255, 255, 255, 0.15);
    transform: scale(0.95);
}

/* 内容区 */
#content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

.page {
    display: none;
    padding: 16px;
    padding-bottom: calc(16px + 60px); /* 底部导航高度 */
    min-height: 100%;
}

.page.active {
    display: block;
}

/* 卡片 */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: var(--shadow-card);
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:active {
    transform: translateY(2px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.card h2 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}

/* 对话页面 */
#chat-page {
    display: flex;
    flex-direction: column;
    padding: 0;
    padding-bottom: 0;
}

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

.message {
    max-width: 85%;
    padding: 12px 16px;
    border-radius: 12px;
    word-wrap: break-word;
    line-height: 1.5;
}

.message.user {
    align-self: flex-end;
    background: var(--gradient-primary);
    color: #FFFFFF;
    border-bottom-right-radius: 4px;
    font-weight: 500;
    box-shadow: 0 2px 8px var(--energy-orange-glow);
}

.message.assistant {
    align-self: flex-start;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-bottom-left-radius: 4px;
    border-left: 3px solid var(--lime-green);
}

.message.system {
    align-self: center;
    background: transparent;
    color: var(--text-muted);
    font-size: 13px;
    text-align: center;
    max-width: 100%;
}

#chat-input-container {
    display: flex;
    gap: 8px;
    padding: 12px 16px;
    padding-bottom: calc(12px + var(--safe-bottom) + 60px);
    background: var(--bg-card);
    border-top: 1px solid var(--border);
}

#chat-input {
    flex: 1;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px 16px;
    color: var(--text-primary);
    font-size: 15px;
    font-family: inherit;
    resize: none;
    max-height: 120px;
    outline: none;
    transition: border-color 0.2s;
}

#chat-input:focus {
    border-color: var(--lime-green);
    box-shadow: 0 0 0 2px var(--lime-green-glow);
}

/* 按钮 */
.primary-btn {
    background: var(--gradient-primary);
    color: #FFFFFF;
    border: none;
    border-radius: 12px;
    padding: 14px 24px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    white-space: nowrap;
    box-shadow: var(--shadow-button);
    letter-spacing: 0.3px;
}

.primary-btn:active {
    transform: scale(0.97);
    box-shadow: 0 2px 8px var(--energy-orange-glow);
}

.secondary-btn {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 14px 24px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    margin-top: 8px;
    width: 100%;
}

.secondary-btn:active {
    transform: scale(0.98);
    background: rgba(26, 31, 58, 0.8);
}

/* 表单 */
label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-top: 12px;
    margin-bottom: 6px;
}

label:first-of-type {
    margin-top: 0;
}

input[type="text"],
input[type="password"] {
    width: 100%;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px 16px;
    color: var(--text-primary);
    font-size: 15px;
    font-family: inherit;
    outline: none;
    transition: all 0.2s;
}

input:focus {
    border-color: var(--lime-green);
    box-shadow: 0 0 0 2px var(--lime-green-glow);
}

/* 底部导航 */
#nav {
    display: flex;
    background: rgba(26, 31, 58, 0.95);
    backdrop-filter: blur(20px);
    border-top: 1px solid var(--border);
    padding-bottom: var(--safe-bottom);
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 100;
}

.nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 10px 8px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
}

.nav-item svg {
    stroke: currentColor;
    transition: all 0.2s;
}

.nav-item span {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.3px;
}

.nav-item.active {
    color: var(--energy-orange);
}

.nav-item.active svg {
    filter: drop-shadow(0 0 8px var(--energy-orange-glow));
}

.nav-item:active {
    transform: scale(0.95);
}

/* 模型切换按钮 */
.model-switch {
    padding: 8px 16px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    margin-right: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.model-switch:active {
    transform: scale(0.95);
}

.model-badge {
    font-size: 13px;
    font-weight: 700;
    color: #FFFFFF;
    letter-spacing: 0.5px;
}

/* 图表容器 */
canvas {
    max-width: 100%;
    height: auto;
}

/* 加载状态 */
.loading {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid var(--border);
    border-top-color: var(--accent-cool);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* 响应式 - 桌面端 */
@media (min-width: 768px) {
    #app {
        max-width: 480px;
        margin: 0 auto;
        border-left: 1px solid var(--border);
        border-right: 1px solid var(--border);
    }
}