/**
 * Gemini M3 设计系统
 * Material Design 3 + Google AI Brand Aesthetics
 *
 * 特性：
 * - 全息渐变 (Holographic Gradients)
 * - 大圆角 (Pill Shape)
 * - 磨砂玻璃 (Frosted Glass)
 * - Sparkle 动画
 * - Google Sans 字体
 */

/* ========================================
   M3 Design Tokens - Gemini Light Mode 色彩系统
   ======================================== */
:root {
    /* 表面色 (Surfaces) - 白天模式 */
    --md-sys-color-surface: #ffffff;
    --md-sys-color-surface-dim: #f5f5f5;
    --md-sys-color-surface-bright: #ffffff;
    --md-sys-color-surface-container-lowest: #ffffff;
    --md-sys-color-surface-container-low: #f8f9fa;
    --md-sys-color-surface-container: #f0f4f9;
    --md-sys-color-surface-container-high: #e9eef6;
    --md-sys-color-surface-container-highest: #dde3ea;

    /* 主色 (Primary) - Gemini Blue */
    --md-sys-color-primary: #1a73e8;
    --md-sys-color-primary-container: #d3e3fd;
    --md-sys-color-on-primary: #ffffff;
    --md-sys-color-on-primary-container: #041e49;

    /* 次要色 (Secondary) */
    --md-sys-color-secondary: #5f6368;
    --md-sys-color-secondary-container: #e8eaed;
    --md-sys-color-on-secondary: #ffffff;
    --md-sys-color-on-secondary-container: #1f1f1f;

    /* 第三色 (Tertiary) - 用于 AI 渐变 */
    --md-sys-color-tertiary: #7c4dff;
    --md-sys-color-tertiary-container: #e8def8;

    /* 错误色 */
    --md-sys-color-error: #d93025;
    --md-sys-color-error-container: #fce8e6;
    --md-sys-color-on-error: #ffffff;

    /* 文字色 */
    --md-sys-color-on-surface: #1f1f1f;
    --md-sys-color-on-surface-variant: #5f6368;
    --md-sys-color-outline: #dadce0;
    --md-sys-color-outline-variant: #e8eaed;

    /* AI 品牌渐变色 */
    --gemini-gradient-1: #4285f4;  /* 蓝 */
    --gemini-gradient-2: #9b72cb;  /* 紫 */
    --gemini-gradient-3: #d96570;  /* 粉红 */
    --gemini-gradient-4: #34a853;  /* 绿 */

    /* 全息渐变 */
    --gemini-holographic: linear-gradient(
        135deg,
        #4285f4 0%,
        #9b72cb 25%,
        #d96570 50%,
        #9b72cb 75%,
        #4285f4 100%
    );

    --gemini-holographic-subtle: linear-gradient(
        135deg,
        rgba(66, 133, 244, 0.3) 0%,
        rgba(155, 114, 203, 0.3) 25%,
        rgba(217, 101, 112, 0.3) 50%,
        rgba(155, 114, 203, 0.3) 75%,
        rgba(66, 133, 244, 0.3) 100%
    );

    /* M3 圆角 */
    --md-sys-shape-corner-none: 0;
    --md-sys-shape-corner-extra-small: 4px;
    --md-sys-shape-corner-small: 8px;
    --md-sys-shape-corner-medium: 12px;
    --md-sys-shape-corner-large: 16px;
    --md-sys-shape-corner-extra-large: 28px;
    --md-sys-shape-corner-full: 9999px;

    /* M3 阴影 */
    --md-sys-elevation-1: 0 1px 2px rgba(0,0,0,0.3), 0 1px 3px 1px rgba(0,0,0,0.15);
    --md-sys-elevation-2: 0 1px 2px rgba(0,0,0,0.3), 0 2px 6px 2px rgba(0,0,0,0.15);
    --md-sys-elevation-3: 0 4px 8px 3px rgba(0,0,0,0.15), 0 1px 3px rgba(0,0,0,0.3);
    --md-sys-elevation-4: 0 6px 10px 4px rgba(0,0,0,0.15), 0 2px 3px rgba(0,0,0,0.3);
    --md-sys-elevation-5: 0 8px 12px 6px rgba(0,0,0,0.15), 0 4px 4px rgba(0,0,0,0.3);

    /* 过渡 */
    --md-sys-motion-duration-short: 150ms;
    --md-sys-motion-duration-medium: 250ms;
    --md-sys-motion-duration-long: 400ms;
    --md-sys-motion-easing-standard: cubic-bezier(0.2, 0, 0, 1);
    --md-sys-motion-easing-emphasized: cubic-bezier(0.2, 0, 0, 1);
}

/* ========================================
   字体系统 - Inter (Gemini 复刻版使用)
   ======================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Outfit:wght@300;400;500;600;700&family=Noto+Sans+SC:wght@300;400;500;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@20..48,100..700,0..1,-50..200');

/* ========================================
   环境光感系统 - Ambient Glow (Light Mode)
   ======================================== */
body {
    font-family: 'Inter', 'Outfit', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-size: 16px;
    line-height: 1.7;
    /* 白天模式 - 纯白背景 */
    background: #ffffff;
    min-height: 100vh;
    color: var(--md-sys-color-on-surface);
}

/* 物理运动引擎 - 全局 MD3 Emphasized Decelerate */
* {
    transition-timing-function: var(--md-sys-motion-easing-emphasized) !important;
}

/* 全局滚动条 - 浅色极简 */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #dadce0;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #bdc1c6;
}

/* 输入框光标颜色 */
input, textarea {
    caret-color: #1a73e8;
}

/* ========================================
   磨砂玻璃质感 - Glassmorphism (Light Mode)
   ======================================== */
.glass-navbar {
    background-color: rgba(255, 255, 255, 0.85) !important;
    backdrop-filter: blur(12px) !important;
    -webkit-backdrop-filter: blur(12px) !important;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08) !important;
}

.glass-input {
    background-color: rgba(255, 255, 255, 0.9) !important;
    backdrop-filter: blur(16px) !important;
    -webkit-backdrop-filter: blur(16px) !important;
    border: 1px solid rgba(0, 0, 0, 0.1) !important;
}

.glass-sidebar {
    background-color: rgba(255, 255, 255, 0.95) !important;
    backdrop-filter: blur(20px) !important;
    -webkit-backdrop-filter: blur(20px) !important;
}

/* ========================================
   品牌渐变系统 - Gemini Gradients
   ======================================== */
.gemini-gradient-text {
    background: linear-gradient(74deg, #4285F4 0%, #9B72CB 9%, #D96570 20%, #E3E3E3 35%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.gemini-gradient-text-animated {
    background: linear-gradient(74deg, #4285F4 0%, #9B72CB 15%, #D96570 30%, #E3E3E3 45%, #4285F4 60%, #9B72CB 75%, #D96570 90%, #E3E3E3 100%);
    background-size: 300% 100%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient-flow 8s linear infinite;
}

@keyframes gradient-flow {
    0% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* ========================================
   State Layers - MD3 交互反馈
   ======================================== */
.state-layer {
    position: relative;
    overflow: hidden;
}

.state-layer::after {
    content: '';
    position: absolute;
    inset: 0;
    background: currentColor;
    opacity: 0;
    transition: opacity 0.2s var(--md-sys-motion-easing-emphasized);
    pointer-events: none;
    border-radius: inherit;
}

.state-layer:hover::after {
    opacity: 0.08;
}

.state-layer:active::after {
    opacity: 0.12;
}

/* 水波纹效果 */
.ripple {
    position: relative;
    overflow: hidden;
}

.ripple::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(0,0,0,0.1) 0%, transparent 60%);
    transform: scale(0);
    opacity: 0;
    transition: transform 0.5s, opacity 0.3s;
    pointer-events: none;
}

.ripple:active::before {
    transform: scale(2);
    opacity: 1;
    transition: transform 0s, opacity 0s;
}

/* ========================================
   底部免责声明
   ======================================== */
.disclaimer-fixed {
    position: fixed;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 11px;
    color: var(--md-sys-color-on-surface-variant);
    opacity: 0.6;
    z-index: 50;
    white-space: nowrap;
}

/* ========================================
   Sparkle 图标 - Google AI 核心符号
   ======================================== */
.sparkle-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.sparkle-icon svg {
    width: 24px;
    height: 24px;
}

/* 静态 Sparkle SVG */
.sparkle-static {
    fill: url(#sparkle-gradient);
}

/* 动态 Sparkle - 发光效果 */
.sparkle-animated {
    animation: sparkle-pulse 2s ease-in-out infinite;
}

@keyframes sparkle-pulse {
    0%, 100% {
        filter: drop-shadow(0 0 4px rgba(138, 180, 248, 0.6));
        transform: scale(1);
    }
    50% {
        filter: drop-shadow(0 0 12px rgba(138, 180, 248, 0.9));
        transform: scale(1.1);
    }
}

/* Sparkle 渐变定义（需要在 HTML 中包含） */
.sparkle-gradient-defs {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
}

/* ========================================
   全息渐变效果 - Holographic
   ======================================== */
.holographic-text {
    background: var(--gemini-holographic);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: holographic-shift 8s ease infinite;
}

@keyframes holographic-shift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* 全息渐变边框 */
.holographic-border {
    position: relative;
    background: var(--md-sys-color-surface-container);
    border-radius: var(--md-sys-shape-corner-extra-large);
}

.holographic-border::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: var(--gemini-holographic);
    background-size: 200% 200%;
    border-radius: inherit;
    z-index: -1;
    animation: holographic-shift 8s ease infinite;
    opacity: 0;
    transition: opacity var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-standard);
}

.holographic-border:hover::before,
.holographic-border:focus-within::before {
    opacity: 1;
}

/* 全息渐变背景光晕 */
.holographic-glow {
    position: relative;
}

.holographic-glow::after {
    content: '';
    position: absolute;
    inset: -50%;
    background: radial-gradient(
        circle at 50% 50%,
        rgba(138, 180, 248, 0.15) 0%,
        rgba(155, 114, 203, 0.1) 30%,
        transparent 70%
    );
    pointer-events: none;
    animation: glow-float 6s ease-in-out infinite;
}

@keyframes glow-float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(10px, -10px) scale(1.05); }
    66% { transform: translate(-10px, 10px) scale(0.95); }
}

/* ========================================
   磨砂玻璃效果 - Frosted Glass (Light Mode)
   ======================================== */
.glass-surface {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 0, 0, 0.08);
}

.glass-surface-elevated {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: var(--md-sys-elevation-3);
}

/* ========================================
   M3 按钮系统 - Pill Shape
   ======================================== */

/* Filled Button - 主要操作 */
.md-filled-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 40px;
    padding: 0 24px;
    border: none;
    border-radius: var(--md-sys-shape-corner-full);
    background: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.1px;
    cursor: pointer;
    transition: all var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
    position: relative;
    overflow: hidden;
}

.md-filled-button::before {
    content: '';
    position: absolute;
    inset: 0;
    background: currentColor;
    opacity: 0;
    transition: opacity var(--md-sys-motion-duration-short);
}

.md-filled-button:hover::before {
    opacity: 0.08;
}

.md-filled-button:active::before {
    opacity: 0.12;
}

.md-filled-button:disabled {
    background: rgba(227, 227, 227, 0.12);
    color: rgba(227, 227, 227, 0.38);
    cursor: not-allowed;
}

/* Filled Tonal Button - 次要操作 */
.md-filled-tonal-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 40px;
    padding: 0 24px;
    border: none;
    border-radius: var(--md-sys-shape-corner-full);
    background: var(--md-sys-color-secondary-container);
    color: var(--md-sys-color-on-secondary-container);
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.1px;
    cursor: pointer;
    transition: all var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
    position: relative;
    overflow: hidden;
}

.md-filled-tonal-button:hover {
    box-shadow: var(--md-sys-elevation-1);
}

/* Outlined Button */
.md-outlined-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 40px;
    padding: 0 24px;
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--md-sys-shape-corner-full);
    background: transparent;
    color: var(--md-sys-color-primary);
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.1px;
    cursor: pointer;
    transition: all var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.md-outlined-button:hover {
    background: rgba(138, 180, 248, 0.08);
}

/* Text Button */
.md-text-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 40px;
    padding: 0 16px;
    border: none;
    border-radius: var(--md-sys-shape-corner-full);
    background: transparent;
    color: var(--md-sys-color-primary);
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.1px;
    cursor: pointer;
    transition: all var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.md-text-button:hover {
    background: rgba(138, 180, 248, 0.08);
}

/* Icon Button */
.md-icon-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--md-sys-shape-corner-full);
    background: transparent;
    color: var(--md-sys-color-on-surface-variant);
    cursor: pointer;
    transition: all var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.md-icon-button:hover {
    background: rgba(0, 0, 0, 0.06);
    color: var(--md-sys-color-on-surface);
}

.md-icon-button svg {
    width: 24px;
    height: 24px;
}

/* FAB - Floating Action Button */
.md-fab {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 56px;
    height: 56px;
    padding: 0 16px;
    border: none;
    border-radius: var(--md-sys-shape-corner-large);
    background: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    box-shadow: var(--md-sys-elevation-3);
    transition: all var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.md-fab:hover {
    box-shadow: var(--md-sys-elevation-4);
}

/* ========================================
   M3 输入框系统 - Pill Shape
   ======================================== */
.md-text-field {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.md-text-field-container {
    display: flex;
    align-items: center;
    min-height: 56px;
    padding: 0 16px;
    background: var(--md-sys-color-surface-container-highest);
    border-radius: var(--md-sys-shape-corner-extra-small) var(--md-sys-shape-corner-extra-small) 0 0;
    border-bottom: 1px solid var(--md-sys-color-on-surface-variant);
    transition: all var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.md-text-field-container:hover {
    background: var(--md-sys-color-surface-container-highest);
    border-bottom-color: var(--md-sys-color-on-surface);
}

.md-text-field-container:focus-within {
    border-bottom: 2px solid var(--md-sys-color-primary);
}

.md-text-field input {
    flex: 1;
    padding: 8px 0;
    border: none;
    background: transparent;
    color: var(--md-sys-color-on-surface);
    font-family: inherit;
    font-size: 16px;
    outline: none;
}

.md-text-field input::placeholder {
    color: var(--md-sys-color-on-surface-variant);
}

/* Outlined Text Field */
.md-outlined-text-field {
    position: relative;
}

.md-outlined-text-field-container {
    display: flex;
    align-items: center;
    min-height: 56px;
    padding: 0 16px;
    background: transparent;
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--md-sys-shape-corner-extra-small);
    transition: all var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.md-outlined-text-field-container:hover {
    border-color: var(--md-sys-color-on-surface);
}

.md-outlined-text-field-container:focus-within {
    border: 2px solid var(--md-sys-color-primary);
}

/* Gemini Style Search Box - 大圆角 */
.gemini-search-box {
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: 56px;
    padding: 8px 24px;
    background: var(--md-sys-color-surface-container);
    border: 1px solid var(--md-sys-color-outline-variant);
    border-radius: var(--md-sys-shape-corner-extra-large);
    transition: all var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-standard);
}

.gemini-search-box:hover {
    background: var(--md-sys-color-surface-container-high);
    border-color: var(--md-sys-color-outline);
}

.gemini-search-box:focus-within {
    background: var(--md-sys-color-surface-container-high);
    border-color: var(--md-sys-color-primary);
    box-shadow: 0 0 0 2px rgba(138, 180, 248, 0.2);
}

.gemini-search-box input {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--md-sys-color-on-surface);
    font-family: inherit;
    font-size: 16px;
    outline: none;
}

.gemini-search-box input::placeholder {
    color: var(--md-sys-color-on-surface-variant);
}

/* ========================================
   M3 卡片系统
   ======================================== */
.md-card {
    background: var(--md-sys-color-surface-container);
    border-radius: var(--md-sys-shape-corner-medium);
    overflow: hidden;
}

.md-card-elevated {
    background: var(--md-sys-color-surface-container-low);
    border-radius: var(--md-sys-shape-corner-medium);
    box-shadow: var(--md-sys-elevation-1);
    transition: box-shadow var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.md-card-elevated:hover {
    box-shadow: var(--md-sys-elevation-2);
}

.md-card-outlined {
    background: var(--md-sys-color-surface);
    border: 1px solid var(--md-sys-color-outline-variant);
    border-radius: var(--md-sys-shape-corner-medium);
}

/* Gemini Gem Card - 特殊样式 */
.gem-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 20px 16px;
    background: var(--md-sys-color-surface-container);
    border: 1px solid var(--md-sys-color-outline-variant);
    border-radius: var(--md-sys-shape-corner-large);
    cursor: pointer;
    transition: all var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-emphasized);
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.gem-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gemini-holographic-subtle);
    background-size: 200% 200%;
    opacity: 0;
    transition: opacity var(--md-sys-motion-duration-medium);
}

.gem-card:hover {
    background: var(--md-sys-color-surface-container-high);
    border-color: var(--md-sys-color-primary);
    transform: translateY(-4px);
    box-shadow: var(--md-sys-elevation-2);
}

.gem-card:hover::before {
    opacity: 1;
    animation: holographic-shift 4s ease infinite;
}

.gem-card-icon {
    position: relative;
    z-index: 1;
    width: 56px;
    height: 56px;
    border-radius: var(--md-sys-shape-corner-medium);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    transition: transform var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-emphasized);
}

.gem-card:hover .gem-card-icon {
    transform: scale(1.1);
}

.gem-card-title {
    position: relative;
    z-index: 1;
    font-size: 14px;
    font-weight: 500;
    color: var(--md-sys-color-on-surface);
    text-align: center;
}

.gem-card-desc {
    position: relative;
    z-index: 1;
    font-size: 12px;
    color: var(--md-sys-color-on-surface-variant);
    text-align: center;
    line-height: 1.4;
}

/* ========================================
   M3 Chip 系统
   ======================================== */
.md-assist-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    height: 32px;
    padding: 0 16px;
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--md-sys-shape-corner-small);
    background: transparent;
    color: var(--md-sys-color-on-surface);
    font-family: inherit;
    font-size: 14px;
    cursor: pointer;
    transition: all var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.md-assist-chip:hover {
    background: rgba(0, 0, 0, 0.06);
}

.md-filter-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    height: 32px;
    padding: 0 16px;
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--md-sys-shape-corner-small);
    background: transparent;
    color: var(--md-sys-color-on-surface-variant);
    font-family: inherit;
    font-size: 14px;
    cursor: pointer;
    transition: all var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.md-filter-chip.selected {
    background: var(--md-sys-color-secondary-container);
    border-color: transparent;
    color: var(--md-sys-color-on-secondary-container);
}

/* ========================================
   Gemini 输入区域 - 大圆角容器
   ======================================== */
.gemini-input-area {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 16px 24px 24px;
    background: linear-gradient(to top, var(--md-sys-color-surface) 80%, transparent);
    z-index: 100;
}

.gemini-input-container {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
}

.gemini-input-wrapper {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 16px 20px;
    background: var(--md-sys-color-surface-container);
    border: 1px solid var(--md-sys-color-outline-variant);
    border-radius: var(--md-sys-shape-corner-extra-large);
    transition: all var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-standard);
}

.gemini-input-wrapper:focus-within {
    border-color: var(--md-sys-color-primary);
    box-shadow: 0 0 0 1px var(--md-sys-color-primary);
}

.gemini-input-wrapper textarea {
    width: 100%;
    min-height: 24px;
    max-height: 200px;
    padding: 8px 0;
    border: none;
    background: transparent;
    color: var(--md-sys-color-on-surface);
    font-family: inherit;
    font-size: 16px;
    line-height: 1.5;
    resize: none;
    outline: none;
}

.gemini-input-wrapper textarea::placeholder {
    color: var(--md-sys-color-on-surface-variant);
}

.gemini-input-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.gemini-input-tools {
    display: flex;
    align-items: center;
    gap: 4px;
}

.gemini-input-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ========================================
   Gemini Logo 渐变动画
   ======================================== */
.gemini-logo {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 12px;
}

.gemini-logo-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--md-sys-shape-corner-small);
    background: var(--gemini-holographic);
    background-size: 200% 200%;
    animation: holographic-shift 8s ease infinite;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: white;
    box-shadow: 0 2px 8px rgba(138, 180, 248, 0.3);
}

.gemini-logo-text {
    font-size: 20px;
    font-weight: 500;
    color: var(--md-sys-color-on-surface);
}

/* ========================================
   AI 响应加载动画 - Gemini 风格
   ======================================== */
.gemini-loading {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 0;
}

.gemini-loading-dots {
    display: flex;
    gap: 6px;
}

.gemini-loading-dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    animation: gemini-dot-pulse 1.4s ease-in-out infinite;
}

.gemini-loading-dots span:nth-child(1) {
    background: var(--gemini-gradient-1);
    animation-delay: 0s;
}

.gemini-loading-dots span:nth-child(2) {
    background: var(--gemini-gradient-2);
    animation-delay: 0.2s;
}

.gemini-loading-dots span:nth-child(3) {
    background: var(--gemini-gradient-3);
    animation-delay: 0.4s;
}

@keyframes gemini-dot-pulse {
    0%, 80%, 100% {
        transform: scale(0.6);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

/* 流式光标 */
.gemini-cursor {
    display: inline-block;
    width: 2px;
    height: 1.2em;
    background: var(--md-sys-color-primary);
    margin-left: 2px;
    animation: gemini-cursor-blink 1s step-end infinite;
    vertical-align: text-bottom;
}

@keyframes gemini-cursor-blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

/* ========================================
   消息气泡 - Gemini 风格
   ======================================== */
.gemini-message {
    display: flex;
    gap: 16px;
    max-width: 100%;
    animation: message-slide-in 0.4s var(--md-sys-motion-easing-emphasized);
}

@keyframes message-slide-in {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.gemini-message-user {
    flex-direction: row-reverse;
}

.gemini-message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 16px;
    font-weight: 500;
    color: white;
}

.gemini-message-ai .gemini-message-avatar {
    background: var(--gemini-holographic);
    background-size: 200% 200%;
    animation: holographic-shift 8s ease infinite;
}

.gemini-message-user .gemini-message-avatar {
    display: none;
}

.gemini-message-content {
    max-width: 80%;
    font-size: 16px;
    line-height: 1.7;
}

.gemini-message-ai .gemini-message-content {
    padding: 0;
    color: var(--md-sys-color-on-surface);
}

.gemini-message-user .gemini-message-content {
    padding: 14px 20px;
    background: var(--md-sys-color-surface-container-high);
    border-radius: var(--md-sys-shape-corner-extra-large);
    color: var(--md-sys-color-on-surface);
}

/* ========================================
   Toast 通知 - M3 Snackbar
   ======================================== */
.md-snackbar {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 280px;
    padding: 14px 16px;
    background: var(--md-sys-color-surface-container-highest);
    border-radius: var(--md-sys-shape-corner-extra-small);
    box-shadow: var(--md-sys-elevation-3);
    color: var(--md-sys-color-on-surface);
    font-size: 14px;
    animation: snackbar-slide-up 0.3s var(--md-sys-motion-easing-emphasized);
    z-index: 10000;
}

@keyframes snackbar-slide-up {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

.md-snackbar-success {
    background: rgba(52, 168, 83, 0.9);
    color: white;
}

.md-snackbar-error {
    background: rgba(234, 67, 53, 0.9);
    color: white;
}

/* ========================================
   对话框 - M3 Dialog
   ======================================== */
.md-dialog-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: dialog-fade-in 0.2s var(--md-sys-motion-easing-standard);
}

@keyframes dialog-fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

.md-dialog {
    background: var(--md-sys-color-surface-container-high);
    border-radius: var(--md-sys-shape-corner-extra-large);
    padding: 24px;
    min-width: 280px;
    max-width: 560px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--md-sys-elevation-5);
    animation: dialog-scale-in 0.3s var(--md-sys-motion-easing-emphasized);
}

@keyframes dialog-scale-in {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.md-dialog-header {
    margin-bottom: 16px;
}

.md-dialog-title {
    font-size: 24px;
    font-weight: 400;
    color: var(--md-sys-color-on-surface);
    margin: 0;
}

.md-dialog-content {
    color: var(--md-sys-color-on-surface-variant);
    font-size: 14px;
    line-height: 1.5;
    margin-bottom: 24px;
}

.md-dialog-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

/* ========================================
   响应式适配
   ======================================== */
@media (max-width: 768px) {
    .gemini-input-area {
        padding: 12px 16px 20px;
    }

    .gemini-input-wrapper {
        padding: 12px 16px;
        border-radius: var(--md-sys-shape-corner-large);
    }

    .gemini-message-content {
        max-width: 90%;
    }

    .gem-card {
        padding: 16px 12px;
    }

    .gem-card-icon {
        width: 48px;
        height: 48px;
        font-size: 24px;
    }
}

@media (max-width: 480px) {
    .md-filled-button,
    .md-filled-tonal-button,
    .md-outlined-button {
        min-height: 36px;
        padding: 0 16px;
        font-size: 13px;
    }

    .gemini-message-avatar {
        width: 32px;
        height: 32px;
        font-size: 14px;
    }
}