:root {
    --primary-color-light: #1A797F;
    --primary-color-dark: #1A797F; /* 改为与浅色相同的颜色 */
    --primary-color: var(--primary-color-light);
    --direct-color: #4299e1; /* 直达模式的颜色（橙色） */
    --btn-text-color: #ffffff;

    --text-color-light: #333; 
    --surface-color-light: rgba(255, 255, 255, 0.75); 
    --border-color-light: rgba(0, 0, 0, 0.08);   
    --hover-color-light: rgba(0, 0, 0, 0.05);
    --shadow-light: 0 8px 32px rgba(31, 38, 135, 0.10);
    
    --placeholder-opacity: 0.5;
    --hint-opacity: 0.8;
    
    --text-color: var(--text-color-light);
    --surface-color: var(--surface-color-light);
    --border-color: var(--border-color-light);
    --hover-color: var(--hover-color-light);
    --box-shadow: var(--shadow-light);
    
    --search-radius: 40px; 
    --backdrop-blur: 15px;
    --transition-speed: 0.5s;
    
    /* 优化：添加焦点边框颜色 */
    --focus-border-color: var(--primary-color);
}

@media (prefers-color-scheme: dark) {
    :root {
        --primary-color: var(--primary-color-dark); /* 现在与浅色相同 */
        --text-color: #ffffff; 
        --surface-color: rgba(30, 35, 45, 0.70); 
        --border-color: rgba(255, 255, 255, 0.12); 
        --hover-color: rgba(255, 255, 255, 0.1);
        --box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
        --backdrop-blur: 30px;   
        --hint-opacity: 0.5;
        
        /* 优化：深色模式下更明显的焦点边框 */
        --focus-border-color: #1A797F; /* 使用相同的主题色 */
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    background-attachment: fixed;
    overflow-x: hidden;
    transition: background var(--transition-speed) ease-in-out;
}

body::before {
    content: ""; 
    position: fixed; 
    inset: 0; 
    z-index: -1;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #3a506b 100%);
    background-attachment: fixed; 
    opacity: 0;
    transition: opacity var(--transition-speed) ease-in-out;
}

@media (prefers-color-scheme: dark) { 
    body { 
        background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #3a506b 100%);
    }
    body::before { 
        opacity: 1; 
    } 
}

.search-container { 
    width: 95%; 
    max-width: 800px; 
    padding: 20px; 
    box-sizing: border-box;
}

.search-form {
    display: flex; 
    align-items: center;
    background-color: var(--surface-color);
    backdrop-filter: blur(var(--backdrop-blur));
    -webkit-backdrop-filter: blur(var(--backdrop-blur));
    border: 1px solid var(--border-color);
    border-radius: var(--search-radius); 
    box-shadow: var(--box-shadow);
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
    height: 64px;
    padding-right: 0; 
    width: 100%;
    min-width: 0; /* 允许在小屏幕上收缩 */
}

.search-form:focus-within {
    border-color: var(--focus-border-color);
    transform: scale(1.01); 
    box-shadow: 0 15px 45px rgba(0, 0, 0, 0.1);
}

/* 深色模式下更明显的焦点状态 */
@media (prefers-color-scheme: dark) {
    .search-form:focus-within {
        border-color: var(--focus-border-color);
        box-shadow: 0 15px 45px rgba(0, 0, 0, 0.3);
    }
}

/* --- 直达模式核心状态切换 --- */
.search-form.direct-mode {
    border-color: var(--direct-color);
    box-shadow: 0 0 0 2px var(--direct-color), var(--box-shadow);
}

.search-form.direct-mode .current-engine {
    display: none; /* 隐藏原引擎选择 */
}

.search-form.direct-mode .direct-badge {
    display: flex; /* 显示文字标签 */
    animation: badgePop 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.search-form.direct-mode .search-input {
    caret-color: var(--direct-color);
}

.search-form.direct-mode .search-button {
    background-color: var(--direct-color);
}

@keyframes badgePop {
    from { opacity: 0; transform: scale(0.8) translateX(-10px); }
    to { opacity: 1; transform: scale(1) translateX(0); }
}

.direct-badge {
    display: none;
    align-items: center;
    padding: 0 15px 0 25px;
    font-size: 15px;
    font-weight: 700;
    color: var(--direct-color);
    letter-spacing: 0.5px;
    white-space: nowrap;
    position: relative;
    flex-shrink: 0;
}

.direct-badge::before {
    content: '['; 
    margin-right: 2px; 
    opacity: 0.5;
}

.direct-badge::after {
    content: ']'; 
    margin-left: 2px; 
    opacity: 0.5;
}

/* -------------------------- */

input[type="search"]::-webkit-search-decoration,
input[type="search"]::-webkit-search-cancel-button,
input[type="search"]::-webkit-search-results-button,
input[type="search"]::-webkit-search-results-decoration {
    -webkit-appearance: none; 
    display: none;
}

.engine-select-wrapper {
    position: relative; 
    height: 100%; 
    cursor: pointer;
    border-right: 1px solid var(--border-color);
    display: flex; 
    align-items: center;
    flex-shrink: 0;
    min-width: 0; /* 允许收缩 */
}

.current-engine {
    display: flex; 
    align-items: center;
    padding: 0 15px 0 25px;
    gap: 8px; 
    font-size: 16px; 
    font-weight: 600;
    letter-spacing: -0.1px;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.arrow-icon {
    font-size: 18px; 
    opacity: 0.5;
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    flex-shrink: 0;
}

.engine-select-wrapper.is-open .arrow-icon { 
    transform: rotate(180deg); 
    color: var(--primary-color); 
    opacity: 1; 
}

.engine-menu {
    display: none; 
    position: absolute; 
    top: calc(100% + 12px); 
    left: 0;
    min-width: 190px; 
    background-color: var(--surface-color);
    backdrop-filter: blur(40px); 
    border: 1px solid var(--border-color);
    border-radius: 20px; 
    box-shadow: 0 20px 50px rgba(0,0,0,0.15);
    padding: 8px; 
    z-index: 100; 
    list-style: none;
    transform-origin: top left;
    transform: translateZ(0);
    will-change: transform;
}

.engine-menu.active { 
    display: block; 
    animation: menuShow 0.4s cubic-bezier(0.16, 1, 0.3, 1); 
}

@keyframes menuShow {
    from { 
        opacity: 0; 
        transform: scale(0.95) translateY(-15px) rotateX(10deg); 
    }
    to { 
        opacity: 1; 
        transform: scale(1) translateY(0) rotateX(0); 
    }
}

.engine-menu li {
    position: relative;
    padding: 12px 16px; 
    border-radius: 14px; 
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex; 
    align-items: center;
    margin-bottom: 2px;
    min-height: 44px;
}

.engine-menu.active li {
    animation: itemSlideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.engine-menu.active li:nth-child(1) { 
    animation-delay: 0.05s; 
}

.engine-menu.active li:nth-child(2) { 
    animation-delay: 0.1s; 
}

.engine-menu.active li:nth-child(3) { 
    animation-delay: 0.15s; 
}

@keyframes itemSlideIn {
    from { opacity: 0; transform: translateX(-10px); }
    to { opacity: 1; transform: translateX(0); }
}

.engine-menu li:hover, 
.engine-menu li.key-active { 
    background-color: var(--hover-color); 
    transform: translateX(4px);
}

/* 深色模式下更明显的悬停效果 */
@media (prefers-color-scheme: dark) {
    .engine-menu li:hover, 
    .engine-menu li.key-active { 
        background-color: rgba(255, 255, 255, 0.15); 
    }
}

.engine-menu li.selected::before {
    content: ""; 
    position: absolute; 
    left: 6px;
    width: 4px; 
    height: 16px; 
    background-color: var(--primary-color);
    border-radius: 4px;
}

.engine-info { 
    display: flex; 
    flex-direction: column; 
    gap: 2px; 
    margin-left: 8px; 
    min-width: 0;
    overflow: hidden;
}

.engine-main { 
    font-size: 15px; 
    font-weight: 600; 
    color: var(--text-color); 
    letter-spacing: -0.1px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.engine-desc { 
    font-size: 11px; 
    opacity: 0.5; 
    font-family: monospace; 
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.search-input {
    flex-grow: 1; 
    border: none; 
    padding: 0 20px;
    height: 100%;
    font-size: clamp(14px, 2.5vw, 18px);
    background: transparent; 
    color: var(--text-color);
    outline: none; 
    caret-color: var(--primary-color);
    caret-shape: block;
    min-width: 0; /* 允许在小屏幕上收缩 */
}

.search-input::placeholder { 
    color: var(--text-color); 
    opacity: var(--placeholder-opacity); 
}

/* 深色模式下更清晰的占位符文本 */
@media (prefers-color-scheme: dark) {
    .search-input::placeholder { 
        opacity: 0.6; 
    }
}

.shortcut-hint {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    height: 24px;
    font-size: 14px; 
    font-weight: 600;
    font-family: -apple-system, system-ui, sans-serif;
    color: var(--text-color);
    background-color: rgba(0, 0, 0, 0.04);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-bottom-width: 2px; 
    border-radius: 6px; 
    margin-right: 15px;
    opacity: var(--hint-opacity); 
    flex-shrink: 0;
    user-select: none;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
    transition: all 0.2s ease;
}

@media (prefers-color-scheme: dark) {
    .shortcut-hint { 
        background-color: rgba(255, 255, 255, 0.1); 
        border-color: rgba(255, 255, 255, 0.1);
        border-bottom-color: rgba(255, 255, 255, 0.2);
        color: #e2e8f0; /* 更亮的文字颜色 */
    }
}

.search-input:not(:placeholder-shown) ~ .shortcut-hint { 
    opacity: 0; 
    transform: scale(0.7); 
    pointer-events: none; 
}

.clear-btn {
    display: flex; 
    align-items: center; 
    justify-content: center;
    color: var(--text-color);
    cursor: pointer; 
    font-size: 22px; 
    line-height: 1;  
    border-radius: 50%;
    flex-shrink: 0;
    user-select: none;
    overflow: hidden;
    opacity: 0;
    transform: scale(0.6);
    width: 0;
    height: 36px; 
    margin-right: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), width 0.2s ease, margin-right 0.2s ease, background-color 0.2s ease;
}

.clear-btn span { 
    display: block; 
    line-height: 1; 
}

.clear-btn.visible {
    opacity: 0.4;
    transform: scale(1);
    width: 36px; 
    margin-right: 10px;
    pointer-events: auto;
}

.clear-btn.visible:hover { 
    opacity: 1; 
    color: var(--primary-color); 
    background-color: var(--hover-color); 
}

/* 深色模式下更明显的清除按钮 */
@media (prefers-color-scheme: dark) {
    .clear-btn.visible:hover { 
        background-color: rgba(255, 255, 255, 0.15); 
    }
}

/* 搜索按钮 */
.search-button {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0 25px; 
    font-size: 18px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    
    height: calc(100% + 2px); 
    margin: -1px -1px -1px 0;
    border-radius: 0 var(--search-radius) var(--search-radius) 0;
    
    flex-shrink: 0;
    gap: 6px; 
    z-index: 1; 
    min-width: auto;
}

.search-button:hover { 
    background-color: #156268; 
}

/* 深色模式下更合适的按钮悬停效果 */
@media (prefers-color-scheme: dark) {
    .search-button:hover { 
        background-color: #156268; 
    }
}

.search-button:active { 
    transform: scale(0.98); 
}

.search-button span {
    font-size: 20px;
    margin: 0;
    transform: translateY(1px); 
}

/* 增强触摸设备体验 */
@media (hover: none) and (pointer: coarse) {
    .clear-btn {
        width: 44px;
        height: 44px;
        min-width: 44px;
    }
    
    .engine-menu li {
        min-height: 44px;
        padding: 12px 16px;
    }
}

@media (max-width: 768px) {
    .search-form { 
        height: 56px; 
        min-height: 56px;
    }
    
    #current-engine-name, 
    .button-text { 
        display: none; 
    }
    
    .engine-select-wrapper { 
        border-right: none; 
        width: auto; 
        min-width: 44px;
        justify-content: center;
    }
    
    .current-engine { 
        padding: 0;
        justify-content: center;
    }
    
    .direct-badge { 
        padding: 0 10px 0 15px; 
        font-size: 14px;
    }

    .search-button { 
        width: 44px; 
        height: 44px; 
        padding: 0; 
        justify-content: center; 
        border-radius: 50%; 
        margin: 0 6px 0 0; 
        align-self: center;
        min-width: 44px;
    }
    
    .shortcut-hint { 
        display: none; 
    }
    
    .clear-btn.visible { 
        margin-right: 5px; 
        width: 36px;
        height: 36px;
    }
    
    .search-input {
        padding: 0 15px;
    }
}

@media (max-width: 480px) {
    .search-form {
        height: 50px;
    }
    
    .search-button {
        width: 40px;
        height: 40px;
        min-width: 40px;
    }
    
    .clear-btn.visible {
        width: 32px;
        height: 32px;
    }
    
    .search-input {
        padding: 0 12px;
        font-size: 16px;
    }
    
    .engine-select-wrapper {
        min-width: 40px;
    }
}

.search-button.is-loading .button-text,
.search-button.is-loading span:not(.loader) { 
    display: none; 
}

.search-button.is-loading::after {
    content: "";
    width: 20px;
    height: 20px;
    border: 3px solid transparent;
    border-top-color: rgba(255,255,255,0.3);
    border-right-color: rgba(255,255,255,0.6);
    border-bottom-color: white;
    border-radius: 50%;
    animation: gradientSpin 0.8s linear infinite;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

@keyframes gradientSpin {
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

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