/* Material3 Design Variables */
:root {
    /* Primary Colors */
    --md-sys-color-primary: #6750A4;
    --md-sys-color-on-primary: #FFFFFF;
    --md-sys-color-primary-container: #EADDFF;
    --md-sys-color-on-primary-container: #21005D;
    --md-sys-color-primary: #0B8B44;
    --md-sys-color-on-primary: #FFFFFF;
    --md-sys-color-primary-container: #A7F8C8;
    --md-sys-color-on-primary-container: #002512;

    /* 绿色主题变量 */
    --md-sys-color-primary-green: #2E7D32;
    --md-sys-color-on-primary-green: #FFFFFF;
    --md-sys-color-primary-container-green: #A7D7A8;
    --md-sys-color-on-primary-container-green: #05210B;

    /* 粉色主题变量 */
    --md-sys-color-primary-pink: #9C27B0;
    --md-sys-color-on-primary-pink: #FFFFFF;
    --md-sys-color-primary-container-pink: #F8BBD9;
    --md-sys-color-on-primary-container-pink: #3A004F;

    /* 绿色主题深色模式 */
    --md-sys-color-primary-green-dark: #A7D7A8;
    --md-sys-color-on-primary-green-dark: #0A3A0E;
    --md-sys-color-primary-container-green-dark: #2E7D32;
    --md-sys-color-on-primary-container-green-dark: #A7D7A8;

    /* 粉色主题深色模式 */
    --md-sys-color-primary-pink-dark: #F8BBD9;
    --md-sys-color-on-primary-pink-dark: #5C126B;
    --md-sys-color-primary-container-pink-dark: #9C27B0;
    --md-sys-color-on-primary-container-pink-dark: #F8BBD9;

    /* 新增蓝色主题变量 */
    --md-sys-color-primary-blue: #1976D2;
    --md-sys-color-on-primary-blue: #FFFFFF;
    --md-sys-color-primary-container-blue: #BBDEFB;
    --md-sys-color-on-primary-container-blue: #0D47A1;

    /* 新增橙色主题变量 */
    --md-sys-color-primary-orange: #FF6F00;
    --md-sys-color-on-primary-orange: #FFFFFF;
    --md-sys-color-primary-container-orange: #FFE0B2;
    --md-sys-color-on-primary-container-orange: #E65100;

    /* 蓝色主题深色模式 */
    --md-sys-color-primary-blue-dark: #BBDEFB;
    --md-sys-color-on-primary-blue-dark: #0D47A1;
    --md-sys-color-primary-container-blue-dark: #1976D2;
    --md-sys-color-on-primary-container-blue-dark: #BBDEFB;

    /* 橙色主题深色模式 */
    --md-sys-color-primary-orange-dark: #FFE0B2;
    --md-sys-color-on-primary-orange-dark: #E65100;
    --md-sys-color-primary-container-orange-dark: #FF6F00;
    --md-sys-color-on-primary-container-orange-dark: #FFE0B2;

    /* Secondary Colors */
    --md-sys-color-secondary: #625B71;
    --md-sys-color-on-secondary: #FFFFFF;
    --md-sys-color-secondary-container: #E8DEF8;
    --md-sys-color-on-secondary-container: #1D192B;
    --md-sys-color-secondary: #525F48;
    --md-sys-color-on-secondary: #FFFFFF;
    --md-sys-color-secondary-container: #D5E3C8;
    --md-sys-color-on-secondary-container: #101D0E;

    /* Tertiary Colors */
    --md-sys-color-tertiary: #7D5260;
    --md-sys-color-on-tertiary: #FFFFFF;
    --md-sys-color-tertiary-container: #FFD8E4;
    --md-sys-color-on-tertiary-container: #31111D;
    --md-sys-color-tertiary: #3F685D;
    --md-sys-color-on-tertiary: #FFFFFF;
    --md-sys-color-tertiary-container: #C1ECE0;
    --md-sys-color-on-tertiary-container: #00211A;

    /* Error Colors */
    --md-sys-color-error: #BA1A1A;
    --md-sys-color-error-container: #FFDAD6;
    --md-sys-color-on-error: #FFFFFF;
    --md-sys-color-on-error-container: #410002;

    /* Background Colors */
    --md-sys-color-background: #FFFBFE;
    --md-sys-color-on-background: #1C1B1F;
    --md-sys-color-surface: #FFFBFE;
    --md-sys-color-on-surface: #1C1B1F;
    --md-sys-color-surface-variant: #E7E0EC;
    --md-sys-color-on-surface-variant: #49454F;
    --md-sys-color-outline: #79747E;
    --md-sys-color-outline-variant: #CAC4D0;

    /* Dark Theme Colors */
    --md-sys-color-primary-dark: #D0BCFF;
    --md-sys-color-on-primary-dark: #381E72;
    --md-sys-color-primary-container-dark: #4F378B;
    --md-sys-color-on-primary-container-dark: #EADDFF;

    --md-sys-color-secondary-dark: #CCC2DC;
    --md-sys-color-on-secondary-dark: #332D41;
    --md-sys-color-secondary-container-dark: #4A4458;
    --md-sys-color-on-secondary-container-dark: #E8DEF8;

    --md-sys-color-tertiary-dark: #EFB8C8;
    --md-sys-color-on-tertiary-dark: #492532;
    --md-sys-color-tertiary-container-dark: #633B48;
    --md-sys-color-on-tertiary-container-dark: #FFD8E4;

    --md-sys-color-error-dark: #FFB4AB;
    --md-sys-color-error-container-dark: #93000A;
    --md-sys-color-on-error-dark: #690005;
    --md-sys-color-on-error-container-dark: #FFDAD6;

    --md-sys-color-background-dark: #1C1B1F;
    --md-sys-color-on-background-dark: #E6E1E5;
    --md-sys-color-surface-dark: #1C1B1F;
    --md-sys-color-on-surface-dark: #E6E1E5;
    --md-sys-color-surface-variant-dark: #49454F;
    --md-sys-color-on-surface-variant-dark: #CAC4D0;
    --md-sys-color-outline-dark: #938F99;
    --md-sys-color-outline-variant-dark: #49454F;

    /* Typography */
    --md-sys-typescale-display-large-font: 'Roboto';
    --md-sys-typescale-display-large-size: 57px;
    --md-sys-typescale-display-large-weight: 400;
    --md-sys-typescale-display-large-line-height: 64px;

    --md-sys-typescale-display-medium-font: 'Roboto';
    --md-sys-typescale-display-medium-size: 45px;
    --md-sys-typescale-display-medium-weight: 400;
    --md-sys-typescale-display-medium-line-height: 52px;

    --md-sys-typescale-display-small-font: 'Roboto';
    --md-sys-typescale-display-small-size: 36px;
    --md-sys-typescale-display-small-weight: 400;
    --md-sys-typescale-display-small-line-height: 44px;

    --md-sys-typescale-headline-large-font: 'Roboto';
    --md-sys-typescale-headline-large-size: 32px;
    --md-sys-typescale-headline-large-weight: 400;
    --md-sys-typescale-headline-large-line-height: 40px;

    --md-sys-typescale-headline-medium-font: 'Roboto';
    --md-sys-typescale-headline-medium-size: 28px;
    --md-sys-typescale-headline-medium-weight: 400;
    --md-sys-typescale-headline-medium-line-height: 36px;

    --md-sys-typescale-headline-small-font: 'Roboto';
    --md-sys-typescale-headline-small-size: 24px;
    --md-sys-typescale-headline-small-weight: 400;
    --md-sys-typescale-headline-small-line-height: 32px;

    --md-sys-typescale-title-large-font: 'Roboto';
    --md-sys-typescale-title-large-size: 22px;
    --md-sys-typescale-title-large-weight: 400;
    --md-sys-typescale-title-large-line-height: 28px;

    --md-sys-typescale-title-medium-font: 'Roboto';
    --md-sys-typescale-title-medium-size: 16px;
    --md-sys-typescale-title-medium-weight: 500;
    --md-sys-typescale-title-medium-line-height: 24px;

    --md-sys-typescale-title-small-font: 'Roboto';
    --md-sys-typescale-title-small-size: 14px;
    --md-sys-typescale-title-small-weight: 500;
    --md-sys-typescale-title-small-line-height: 20px;

    --md-sys-typescale-body-large-font: 'Roboto';
    --md-sys-typescale-body-large-size: 16px;
    --md-sys-typescale-body-large-weight: 400;
    --md-sys-typescale-body-large-line-height: 24px;

    --md-sys-typescale-body-medium-font: 'Roboto';
    --md-sys-typescale-body-medium-size: 14px;
    --md-sys-typescale-body-medium-weight: 400;
    --md-sys-typescale-body-medium-line-height: 20px;

    --md-sys-typescale-body-small-font: 'Roboto';
    --md-sys-typescale-body-small-size: 12px;
    --md-sys-typescale-body-small-weight: 400;
    --md-sys-typescale-body-small-line-height: 16px;

    --md-sys-typescale-label-large-font: 'Roboto';
    --md-sys-typescale-label-large-size: 14px;
    --md-sys-typescale-label-large-weight: 500;
    --md-sys-typescale-label-large-line-height: 20px;

    --md-sys-typescale-label-medium-font: 'Roboto';
    --md-sys-typescale-label-medium-size: 12px;
    --md-sys-typescale-label-medium-weight: 500;
    --md-sys-typescale-label-medium-line-height: 16px;

    --md-sys-typescale-label-small-font: 'Roboto';
    --md-sys-typescale-label-small-size: 11px;
    --md-sys-typescale-label-small-weight: 500;
    --md-sys-typescale-label-small-line-height: 16px;

    /* Shape */
    --md-sys-shape-corner-none: 0px;
    --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;

    /* Elevation */
    --md-sys-elevation-level0: 0px 0px 0px 0px rgba(0, 0, 0, 0.2), 0px 0px 0px 0px rgba(0, 0, 0, 0.14), 0px 0px 0px 0px rgba(0, 0, 0, 0.12);
    --md-sys-elevation-level1: 0px 2px 1px -1px rgba(0, 0, 0, 0.2), 0px 1px 1px 0px rgba(0, 0, 0, 0.14), 0px 1px 3px 0px rgba(0, 0, 0, 0.12);
    --md-sys-elevation-level2: 0px 3px 1px -2px rgba(0, 0, 0, 0.2), 0px 2px 2px 0px rgba(0, 0, 0, 0.14), 0px 1px 5px 0px rgba(0, 0, 0, 0.12);
    --md-sys-elevation-level3: 0px 3px 3px -2px rgba(0, 0, 0, 0.2), 0px 3px 4px 0px rgba(0, 0, 0, 0.14), 0px 1px 8px 0px rgba(0, 0, 0, 0.12);
    --md-sys-elevation-level4: 0px 2px 4px -1px rgba(0, 0, 0, 0.2), 0px 4px 5px 0px rgba(0, 0, 0, 0.14), 0px 1px 10px 0px rgba(0, 0, 0, 0.12);
    --md-sys-elevation-level5: 0px 3px 5px -1px rgba(0, 0, 0, 0.2), 0px 5px 8px 0px rgba(0, 0, 0, 0.14), 0px 1px 14px 0px rgba(0, 0, 0, 0.12);

    /* State Layers */
    --md-sys-state-hover-state-layer-opacity: 0.08;
    --md-sys-state-focus-state-layer-opacity: 0.12;
    --md-sys-state-pressed-state-layer-opacity: 0.12;
    --md-sys-state-dragged-state-layer-opacity: 0.16;
}

/* Dark Theme */
body.dark-theme:not(.color-theme-green):not(.color-theme-pink) {
    --md-sys-color-primary: var(--md-sys-color-primary-dark);
    --md-sys-color-on-primary: var(--md-sys-color-on-primary-dark);
    --md-sys-color-primary-container: var(--md-sys-color-primary-container-dark);
    --md-sys-color-on-primary-container: var(--md-sys-color-on-primary-container-dark);

    --md-sys-color-secondary: var(--md-sys-color-secondary-dark);
    --md-sys-color-on-secondary: var(--md-sys-color-on-secondary-dark);
    --md-sys-color-secondary-container: var(--md-sys-color-secondary-container-dark);
    --md-sys-color-on-secondary-container: var(--md-sys-color-on-secondary-container-dark);

    --md-sys-color-tertiary: var(--md-sys-color-tertiary-dark);
    --md-sys-color-on-tertiary: var(--md-sys-color-on-tertiary-dark);
    --md-sys-color-tertiary-container: var(--md-sys-color-tertiary-container-dark);
    --md-sys-color-on-tertiary-container: var(--md-sys-color-on-tertiary-container-dark);

    --md-sys-color-error: var(--md-sys-color-error-dark);
    --md-sys-color-error-container: var(--md-sys-color-error-container-dark);
    --md-sys-color-on-error: var(--md-sys-color-on-error-dark);
    --md-sys-color-on-error-container: var(--md-sys-color-on-error-container-dark);

    --md-sys-color-background: var(--md-sys-color-background-dark);
    --md-sys-color-on-background: var(--md-sys-color-on-background-dark);
    --md-sys-color-surface: var(--md-sys-color-surface-dark);
    --md-sys-color-on-surface: var(--md-sys-color-on-surface-dark);
    --md-sys-color-surface-variant: var(--md-sys-color-surface-variant-dark);
    --md-sys-color-on-surface-variant: var(--md-sys-color-on-surface-variant-dark);
    --md-sys-color-outline: var(--md-sys-color-outline-dark);
    --md-sys-color-outline-variant: var(--md-sys-color-outline-variant-dark);

    --md-sys-color-primary: var(--md-sys-color-primary-dark);
    --md-sys-color-on-primary: var(--md-sys-color-on-primary-dark);
    --md-sys-color-primary-container: var(--md-sys-color-primary-container-dark);
    --md-sys-color-on-primary-container: var(--md-sys-color-on-primary-container-dark);
}

/* 绿色主题 */
body.color-theme-green {
    --md-sys-color-primary: var(--md-sys-color-primary-green);
    --md-sys-color-on-primary: var(--md-sys-color-on-primary-green);
    --md-sys-color-primary-container: var(--md-sys-color-primary-container-green);
    --md-sys-color-on-primary-container: var(--md-sys-color-on-primary-container-green);
}

/* 粉色主题 */
body.color-theme-pink {
    --md-sys-color-primary: var(--md-sys-color-primary-pink);
    --md-sys-color-on-primary: var(--md-sys-color-on-primary-pink);
    --md-sys-color-primary-container: var(--md-sys-color-primary-container-pink);
    --md-sys-color-on-primary-container: var(--md-sys-color-on-primary-container-pink);
}

/* 绿色主题 + 深色模式 */
body.color-theme-green.dark-theme {
    --md-sys-color-primary: var(--md-sys-color-primary-green-dark);
    --md-sys-color-on-primary: var(--md-sys-color-on-primary-green-dark);
    --md-sys-color-primary-container: var(--md-sys-color-primary-container-green-dark);
    --md-sys-color-on-primary-container: var(--md-sys-color-on-primary-container-green-dark);
}

/* 粉色主题 + 深色模式 */
body.color-theme-pink.dark-theme {
    --md-sys-color-primary: var(--md-sys-color-primary-pink-dark);
    --md-sys-color-on-primary: var(--md-sys-color-on-primary-pink-dark);
    --md-sys-color-primary-container: var(--md-sys-color-primary-container-pink-dark);
    --md-sys-color-on-primary-container: var(--md-sys-color-on-primary-container-pink-dark);
}

/* 新增蓝色主题样式 */
body.color-theme-blue {
    --md-sys-color-primary: var(--md-sys-color-primary-blue);
    --md-sys-color-on-primary: var(--md-sys-color-on-primary-blue);
    --md-sys-color-primary-container: var(--md-sys-color-primary-container-blue);
    --md-sys-color-on-primary-container: var(--md-sys-color-on-primary-container-blue);
}

body.color-theme-blue.dark-theme {
    --md-sys-color-primary: var(--md-sys-color-primary-blue-dark);
    --md-sys-color-on-primary: var(--md-sys-color-on-primary-blue-dark);
    --md-sys-color-primary-container: var(--md-sys-color-primary-container-blue-dark);
    --md-sys-color-on-primary-container: var(--md-sys-color-on-primary-container-blue-dark);
}

/* 新增橙色主题样式 */
body.color-theme-orange {
    --md-sys-color-primary: var(--md-sys-color-primary-orange);
    --md-sys-color-on-primary: var(--md-sys-color-on-primary-orange);
    --md-sys-color-primary-container: var(--md-sys-color-primary-container-orange);
    --md-sys-color-on-primary-container: var(--md-sys-color-on-primary-container-orange);
}

body.color-theme-orange.dark-theme {
    --md-sys-color-primary: var(--md-sys-color-primary-orange-dark);
    --md-sys-color-on-primary: var(--md-sys-color-on-primary-orange-dark);
    --md-sys-color-primary-container: var(--md-sys-color-primary-container-orange-dark);
    --md-sys-color-on-primary-container: var(--md-sys-color-on-primary-container-orange-dark);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--md-sys-typescale-body-large-font);
    font-size: var(--md-sys-typescale-body-large-size);
    font-weight: var(--md-sys-typescale-body-large-weight);
    line-height: var(--md-sys-typescale-body-large-line-height);
    color: var(--md-sys-color-on-surface);
    background-color: var(--md-sys-color-background);
    transition: background-color 0.3s ease, color 0.3s ease;
}

a {
    color: var(--md-sys-color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--md-sys-color-primary-container);
}

img {
    max-width: 100%;
    height: auto;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px;
}

/* Material Icons */
.material-icons {
    font-family: 'Material Icons';
    font-weight: normal;
    font-style: normal;
    font-size: 24px;
    line-height: 1;
    letter-spacing: normal;
    text-transform: none;
    display: inline-block;
    white-space: nowrap;
    word-wrap: normal;
    direction: ltr;
    -webkit-font-feature-settings: 'liga';
    -webkit-font-smoothing: antialiased;
}

/* Header */
.app-header {
    background-color: var(--md-sys-color-surface);
    color: var(--md-sys-color-on-surface);
    box-shadow: var(--md-sys-elevation-level2);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
}

.logo .logo-text {
    font-family: var(--md-sys-typescale-title-large-font);
    font-size: var(--md-sys-typescale-title-large-size);
    font-weight: var(--md-sys-typescale-title-large-weight);
    line-height: var(--md-sys-typescale-title-large-line-height);
    color: var(--md-sys-color-primary);
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 24px;
}

.main-nav a {
    color: var(--md-sys-color-on-surface-variant);
    font-family: var(--md-sys-typescale-title-medium-font);
    font-size: var(--md-sys-typescale-title-medium-size);
    font-weight: var(--md-sys-typescale-title-medium-weight);
    line-height: var(--md-sys-typescale-title-medium-line-height);
    position: relative;
    padding: 8px 0;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--md-sys-color-primary);
    transition: width 0.3s ease;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--md-sys-color-primary);
}

.main-nav a:hover::after,
.main-nav a.active::after {
    width: 100%;
}

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

.icon-button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--md-sys-shape-corner-full);
    background-color: transparent;
    border: none;
    color: var(--md-sys-color-on-surface-variant);
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.icon-button:hover {
    background-color: rgba(var(--md-sys-color-primary), var(--md-sys-state-hover-state-layer-opacity));
}

.icon-button:focus {
    background-color: rgba(var(--md-sys-color-primary), var(--md-sys-state-focus-state-layer-opacity));
    outline: none;
}

.icon-button:active {
    background-color: rgba(var(--md-sys-color-primary), var(--md-sys-state-pressed-state-layer-opacity));
}

.language-switcher {
    position: relative;
}

.lang-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background-color: var(--md-sys-color-surface);
    border-radius: var(--md-sys-shape-corner-medium);
    box-shadow: var(--md-sys-elevation-level3);
    min-width: 120px;
    overflow: hidden;
    display: none;
    z-index: 1001;
}

.lang-dropdown.show {
    display: block;
}

.lang-dropdown a {
    display: block;
    padding: 12px 16px;
    color: var(--md-sys-color-on-surface);
    transition: background-color 0.2s ease;
}

.lang-dropdown a:hover,
.lang-dropdown a.active {
    background-color: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
}

/* Main Content */
.main-content {
    min-height: calc(100vh - 64px - 200px);
    padding: 32px 0;
}

/* Hero Section */
.hero {
    padding: 48px 0;
    background-color: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    border-radius: var(--md-sys-shape-corner-large);
    margin-bottom: 48px;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-family: var(--md-sys-typescale-headline-medium-font);
    font-size: var(--md-sys-typescale-headline-medium-size);
    font-weight: var(--md-sys-typescale-headline-medium-weight);
    line-height: var(--md-sys-typescale-headline-medium-line-height);
    margin-bottom: 16px;
}

.hero p {
    font-family: var(--md-sys-typescale-body-large-font);
    font-size: var(--md-sys-typescale-body-large-size);
    font-weight: var(--md-sys-typescale-body-large-weight);
    line-height: var(--md-sys-typescale-body-large-line-height);
}

/* Latest Articles Section */
.latest-articles h2,
.related-articles h2 {
    font-family: var(--md-sys-typescale-headline-small-font);
    font-size: var(--md-sys-typescale-headline-small-size);
    font-weight: var(--md-sys-typescale-headline-small-weight);
    line-height: var(--md-sys-typescale-headline-small-line-height);
    color: var(--md-sys-color-on-surface);
    margin-bottom: 24px;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.article-card {
    background-color: var(--md-sys-color-surface);
    border-radius: var(--md-sys-shape-corner-medium);
    box-shadow: var(--md-sys-elevation-level1);
    overflow: hidden;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.article-card:hover {
    box-shadow: var(--md-sys-elevation-level3);
    transform: translateY(-4px);
}

.article-content {
    padding: 24px;
}

.article-content h3 {
    font-family: var(--md-sys-typescale-title-large-font);
    font-size: var(--md-sys-typescale-title-large-size);
    font-weight: var(--md-sys-typescale-title-large-weight);
    line-height: var(--md-sys-typescale-title-large-line-height);
    margin-bottom: 12px;
}

.article-content h3 a {
    color: var(--md-sys-color-on-surface);
}

.article-content h3 a:hover {
    color: var(--md-sys-color-primary);
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 16px;
    font-size: var(--md-sys-typescale-body-small-size);
    color: var(--md-sys-color-on-surface-variant);
}

.article-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.article-meta .material-icons {
    font-size: 16px;
}

.summary {
    font-family: var(--md-sys-typescale-body-medium-font);
    font-size: var(--md-sys-typescale-body-medium-size);
    font-weight: var(--md-sys-typescale-body-medium-weight);
    line-height: var(--md-sys-typescale-body-medium-line-height);
    color: var(--md-sys-color-on-surface-variant);
    margin-bottom: 16px;
}

.read-more {
    font-family: var(--md-sys-typescale-label-large-font);
    font-size: var(--md-sys-typescale-label-large-size);
    font-weight: var(--md-sys-typescale-label-large-weight);
    line-height: var(--md-sys-typescale-label-large-line-height);
    color: var(--md-sys-color-primary);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.read-more::after {
    content: '→';
}

.read-more:hover {
    color: var(--md-sys-color-on-primary-container);
}

.view-all {
    text-align: center;
}

.no-content {
    text-align: center;
    padding: 48px 0;
    color: var(--md-sys-color-on-surface-variant);
}

/* Buttons */
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    font-family: var(--md-sys-typescale-label-large-font);
    font-size: var(--md-sys-typescale-label-large-size);
    font-weight: var(--md-sys-typescale-label-large-weight);
    line-height: var(--md-sys-typescale-label-large-line-height);
    border-radius: var(--md-sys-shape-corner-full);
    background-color: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    border: none;
    cursor: pointer;
    transition: background-color 0.2s ease, box-shadow 0.2s ease;
    box-shadow: var(--md-sys-elevation-level0);
}

.button:hover {
    background-color: var(--md-sys-color-primary-container);
    box-shadow: var(--md-sys-elevation-level1);
}

.button:focus {
    outline: none;
    box-shadow: var(--md-sys-elevation-level2);
}

.button:active {
    box-shadow: var(--md-sys-elevation-level0);
}

.button.outlined {
    background-color: transparent;
    color: var(--md-sys-color-primary);
    border: 1px solid var(--md-sys-color-outline);
}

.button.outlined:hover {
    background-color: rgba(var(--md-sys-color-primary), var(--md-sys-state-hover-state-layer-opacity));
}

.button.text {
    background-color: transparent;
    color: var(--md-sys-color-primary);
    border: none;
    padding: 8px 16px;
}

.button.text:hover {
    background-color: rgba(var(--md-sys-color-primary), var(--md-sys-state-hover-state-layer-opacity));
}

/* Footer */
.app-footer {
    background-color: var(--md-sys-color-surface-variant);
    color: var(--md-sys-color-on-surface-variant);
    padding: 48px 0 24px;
    margin-top: 64px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 32px;
    margin-bottom: 32px;
}

.footer-logo {
    font-family: var(--md-sys-typescale-title-large-font);
    font-size: var(--md-sys-typescale-title-large-size);
    font-weight: var(--md-sys-typescale-title-large-weight);
    line-height: var(--md-sys-typescale-title-large-line-height);
    color: var(--md-sys-color-primary);
}

.footer-links ul {
    list-style: none;
}

.footer-links a {
    color: var(--md-sys-color-on-surface-variant);
    display: block;
    padding: 8px 0;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--md-sys-color-primary);
}

.footer-copyright {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--md-sys-color-outline-variant);
    font-size: var(--md-sys-typescale-body-small-size);
}

/* Article Detail */
.article-detail {
    padding: 32px 0;
}

.article-header {
    margin-bottom: 32px;
}

.breadcrumb {
    font-size: var(--md-sys-typescale-body-small-size);
    color: var(--md-sys-color-on-surface-variant);
    margin-bottom: 16px;
}

.breadcrumb a {
    color: var(--md-sys-color-on-surface-variant);
}

.breadcrumb a:hover {
    color: var(--md-sys-color-primary);
}

.article-header h1 {
    font-family: var(--md-sys-typescale-headline-medium-font);
    font-size: var(--md-sys-typescale-headline-medium-size);
    font-weight: var(--md-sys-typescale-headline-medium-weight);
    line-height: var(--md-sys-typescale-headline-medium-line-height);
    color: var(--md-sys-color-on-surface);
    margin-bottom: 16px;
}

.article-body {
    background-color: var(--md-sys-color-surface);
    border-radius: var(--md-sys-shape-corner-medium);
    padding: 32px;
    box-shadow: var(--md-sys-elevation-level1);
    margin-bottom: 32px;
    line-height: 1.8;
}

.article-body h2 {
    font-family: var(--md-sys-typescale-headline-small-font);
    font-size: var(--md-sys-typescale-headline-small-size);
    font-weight: var(--md-sys-typescale-headline-small-weight);
    line-height: var(--md-sys-typescale-headline-small-line-height);
    color: var(--md-sys-color-on-surface);
    margin: 32px 0 16px;
}

.article-body h3 {
    font-family: var(--md-sys-typescale-title-large-font);
    font-size: var(--md-sys-typescale-title-large-size);
    font-weight: var(--md-sys-typescale-title-large-weight);
    line-height: var(--md-sys-typescale-title-large-line-height);
    color: var(--md-sys-color-on-surface);
    margin: 24px 0 12px;
}

.article-body p {
    margin-bottom: 16px;
}

.article-body ul,
.article-body ol {
    margin-bottom: 16px;
    padding-left: 24px;
}

.article-body li {
    margin-bottom: 8px;
}

.article-body blockquote {
    border-left: 4px solid var(--md-sys-color-primary);
    padding-left: 16px;
    margin: 16px 0;
    color: var(--md-sys-color-on-surface-variant);
}

.article-body img {
    border-radius: var(--md-sys-shape-corner-medium);
    margin: 16px 0;
}

.article-body pre {
    background-color: var(--md-sys-color-surface-variant);
    border-radius: var(--md-sys-shape-corner-small);
    padding: 16px;
    overflow-x: auto;
    margin: 16px 0;
}

.article-body code {
    font-family: 'Roboto Mono', monospace;
    background-color: var(--md-sys-color-surface-variant);
    padding: 2px 4px;
    border-radius: var(--md-sys-shape-corner-extra-small);
    font-size: 0.9em;
}

.article-body pre code {
    background-color: transparent;
    padding: 0;
}

.article-footer {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}

.tag {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    background-color: var(--md-sys-color-secondary-container);
    color: var(--md-sys-color-on-secondary-container);
    border-radius: var(--md-sys-shape-corner-full);
    font-size: var(--md-sys-typescale-body-small-size);
    transition: background-color 0.2s ease;
}

.tag:hover {
    background-color: var(--md-sys-color-secondary);
    color: var(--md-sys-color-on-secondary);
}

.article-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.share-buttons {
    display: flex;
    gap: 8px;
}

/* Search Section */
.search-section {
    padding: 32px 0;
}

.search-container {
    max-width: 800px;
    margin: 0 auto;
}

.search-container h1 {
    font-family: var(--md-sys-typescale-headline-medium-font);
    font-size: var(--md-sys-typescale-headline-medium-size);
    font-weight: var(--md-sys-typescale-headline-medium-weight);
    line-height: var(--md-sys-typescale-headline-medium-line-height);
    color: var(--md-sys-color-on-surface);
    margin-bottom: 24px;
    text-align: center;
}

.search-form {
    margin-bottom: 32px;
}

.search-input-group {
    display: flex;
    margin-bottom: 16px;
}

.search-input-group input {
    flex: 1;
    padding: 12px 16px;
    font-family: var(--md-sys-typescale-body-large-font);
    font-size: var(--md-sys-typescale-body-large-size);
    font-weight: var(--md-sys-typescale-body-large-weight);
    line-height: var(--md-sys-typescale-body-large-line-height);
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--md-sys-shape-corner-medium) 0 0 var(--md-sys-shape-corner-medium);
    background-color: var(--md-sys-color-surface);
    color: var(--md-sys-color-on-surface);
    transition: border-color 0.2s ease;
}

.search-input-group input:focus {
    outline: none;
    border-color: var(--md-sys-color-primary);
}

.search-input-group button {
    border-radius: 0 var(--md-sys-shape-corner-medium) var(--md-sys-shape-corner-medium) 0;
}

.search-types {
    display: flex;
    justify-content: center;
    gap: 24px;
}

.search-type {
    display: flex;
    align-items: center;
    gap: 8px;
}

.search-type input[type="radio"] {
    width: 18px;
    height: 18px;
    accent-color: var(--md-sys-color-primary);
}

.search-type label {
    cursor: pointer;
}

.search-results-info {
    margin-bottom: 24px;
    text-align: center;
    color: var(--md-sys-color-on-surface-variant);
}

.search-result-item {
    background-color: var(--md-sys-color-surface);
    border-radius: var(--md-sys-shape-corner-medium);
    padding: 24px;
    margin-bottom: 16px;
    box-shadow: var(--md-sys-elevation-level1);
    transition: box-shadow 0.2s ease;
}

.search-result-item:hover {
    box-shadow: var(--md-sys-elevation-level3);
}

.search-result-item h3 {
    font-family: var(--md-sys-typescale-title-large-font);
    font-size: var(--md-sys-typescale-title-large-size);
    font-weight: var(--md-sys-typescale-title-large-weight);
    line-height: var(--md-sys-typescale-title-large-line-height);
    margin-bottom: 12px;
}

.search-result-item h3 a {
    color: var(--md-sys-color-on-surface);
}

.search-result-item h3 a:hover {
    color: var(--md-sys-color-primary);
}

.search-result-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 12px;
    font-size: var(--md-sys-typescale-body-small-size);
    color: var(--md-sys-color-on-surface-variant);
}

.search-result-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.search-result-meta .material-icons {
    font-size: 16px;
}

.search-result-excerpt {
    color: var(--md-sys-color-on-surface-variant);
    margin-bottom: 16px;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 32px;
}

.pagination-link {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 12px;
    margin: 0 4px;
    border-radius: var(--md-sys-shape-corner-medium);
    background-color: transparent;
    color: var(--md-sys-color-on-surface-variant);
    font-family: var(--md-sys-typescale-body-large-font);
    font-size: var(--md-sys-typescale-body-large-size);
    font-weight: var(--md-sys-typescale-body-large-weight);
    line-height: var(--md-sys-typescale-body-large-line-height);
    transition: background-color 0.2s ease, color 0.2s ease;
}

.pagination-link:hover {
    background-color: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
}

.pagination-link.active {
    background-color: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
}

.pagination-ellipsis {
    margin: 0 4px;
    color: var(--md-sys-color-on-surface-variant);
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-wrap: wrap;
    }

    .main-nav {
        order: 3;
        width: 100%;
        margin-top: 16px;
    }

    .main-nav ul {
        flex-wrap: wrap;
        gap: 16px;
    }

    .hero {
        padding: 32px 0;
    }

    .hero h1 {
        font-size: var(--md-sys-typescale-headline-small-size);
        line-height: var(--md-sys-typescale-headline-small-line-height);
    }

    .articles-grid {
        grid-template-columns: 1fr;
    }

    .article-body {
        padding: 16px;
    }

    .article-actions {
        flex-direction: column;
        gap: 16px;
        align-items: flex-start;
    }

    .search-types {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }

    .pagination {
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 12px;
    }

    .header-content {
        padding: 12px 0;
    }

    .main-content {
        padding: 16px 0;
    }

    .hero {
        padding: 24px 0;
        margin-bottom: 24px;
    }

    .article-header h1 {
        font-size: var(--md-sys-typescale-title-large-size);
        line-height: var(--md-sys-typescale-title-large-line-height);
    }

    .search-input-group {
        flex-direction: column;
    }

    .search-input-group input {
        border-radius: var(--md-sys-shape-corner-medium);
        margin-bottom: 8px;
    }

    .search-input-group button {
        border-radius: var(--md-sys-shape-corner-medium);
        width: 100%;
    }
}

/* 主题按钮样式 */
.theme-button {
    position: relative;
    background: none;
    border: none;
    padding: 0.75rem;
    border-radius: 50%;
    cursor: pointer;
    color: var(--md-sys-color-on-surface, #1C1B1F);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-button:hover {
    background-color: var(--md-sys-color-primary-container, #EADDFF);
    color: var(--md-sys-color-on-primary-container, #21005D);
}

.theme-button.active {
    background-color: var(--md-sys-color-primary, #6750A4);
    color: var(--md-sys-color-on-primary, #FFFFFF);
}

/* 主题面板样式 */
.theme-panel {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    background-color: var(--md-sys-color-surface, #FFFBFE);
    border: 1px solid var(--md-sys-color-outline-variant, #CAC4D0);
    border-radius: 12px;
    box-shadow: 0px 3px 3px -2px rgba(0, 0, 0, 0.2), 0px 3px 4px 0px rgba(0, 0, 0, 0.14), 0px 1px 8px 0px rgba(0, 0, 0, 0.12);
    padding: 1.5rem;
    min-width: 280px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
    z-index: 1000;
}

.theme-panel.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.theme-panel::before {
    content: '';
    position: absolute;
    top: -6px;
    right: 1rem;
    width: 12px;
    height: 12px;
    background-color: var(--md-sys-color-surface, #FFFBFE);
    border: 1px solid var(--md-sys-color-outline-variant, #CAC4D0);
    border-bottom: none;
    border-right: none;
    transform: rotate(45deg);
}

.theme-section {
    margin-bottom: 1.5rem;
}

.theme-section:last-child {
    margin-bottom: 0;
}

.theme-section-title {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--md-sys-color-on-surface, #1C1B1F);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* 明暗模式切换开关 */
.theme-mode-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem;
    border-radius: 8px;
    background-color: var(--md-sys-color-surface-variant, #E7E0EC);
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.theme-mode-toggle:hover {
    background-color: var(--md-sys-color-primary-container, #EADDFF);
}

.theme-mode-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.theme-mode-icon {
    color: var(--md-sys-color-primary, #6750A4);
}

.theme-mode-text {
    font-size: 0.875rem;
    color: var(--md-sys-color-on-surface, #1C1B1F);
}

.theme-switch {
    position: relative;
    width: 44px;
    height: 24px;
    background-color: var(--md-sys-color-outline, #79747E);
    border-radius: 12px;
    transition: background-color 0.2s ease;
}

.theme-switch.active {
    background-color: var(--md-sys-color-primary, #6750A4);
}

.theme-switch-thumb {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background-color: var(--md-sys-color-surface, #FFFBFE);
    border-radius: 50%;
    transition: transform 0.2s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.theme-switch.active .theme-switch-thumb {
    transform: translateX(20px);
}

/* 颜色主题选择器 */
.color-themes {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.color-theme-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 2px solid transparent;
}

.color-theme-option:hover {
    background-color: var(--md-sys-color-surface-variant, #E7E0EC);
}

.color-theme-option.active {
    background-color: var(--md-sys-color-primary-container, #EADDFF);
    border-color: var(--md-sys-color-primary, #6750A4);
}

.color-preview {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 2px solid var(--md-sys-color-outline-variant, #CAC4D0);
    flex-shrink: 0;
}

.color-preview.default {
    background: linear-gradient(135deg, #6750A4, #9C27B0);
}

.color-preview.green {
    background: linear-gradient(135deg, #2E7D32, #4CAF50);
}

.color-preview.pink {
    background: linear-gradient(135deg, #9C27B0, #E91E63);
}

.color-preview.blue {
    background: linear-gradient(135deg, #1976D2, #2196F3);
}

.color-preview.orange {
    background: linear-gradient(135deg, #FF6F00, #FF9800);
}

.color-theme-name {
    font-size: 0.875rem;
    color: var(--md-sys-color-on-surface, #1C1B1F);
    font-weight: 400;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .theme-panel {
        right: -1rem;
        left: 1rem;
        min-width: auto;
    }

    .color-themes {
        grid-template-columns: 1fr;
    }
}

/* 通知样式（如果您没有现有的通知系统） */
.theme-notification {
    position: fixed;
    top: 2rem;
    right: 2rem;
    background-color: var(--md-sys-color-primary, #6750A4);
    color: var(--md-sys-color-on-primary, #FFFFFF);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    box-shadow: 0px 3px 3px -2px rgba(0, 0, 0, 0.2), 0px 3px 4px 0px rgba(0, 0, 0, 0.14), 0px 1px 8px 0px rgba(0, 0, 0, 0.12);
    z-index: 2000;
    font-size: 0.875rem;
    font-weight: 500;
}

/* 动画效果 */
@keyframes themeTransition {
    from {
        opacity: 0.8;
    }

    to {
        opacity: 1;
    }
}

body {
    animation: themeTransition 0.3s ease;
}