/**
 * Python.org Mirror Site - Combined Styles
 * 合并优化版本 - 减少 HTTP 请求
 * 
 * 包含: variables, reset, base, components, pages, responsive, loading
 */

/* ============================================
   CSS Variables - Design Tokens
   ============================================ */
:root {
  --color-primary-dark: #1e415d;
  --color-primary: #2d618c;
  --color-primary-light: #3776ab;
  --color-accent: #ffd43b;
  --color-accent-hover: #ffe873;
  --color-text: #333;
  --color-text-light: #666;
  --color-text-muted: #999;
  --color-text-white: #fff;
  --color-bg: #fff;
  --color-bg-alt: #f5f5f5;
  --color-bg-dark: #1e415d;
  --color-border: #e0e0e0;
  --color-border-light: #f0f0f0;
  --color-code-bg: #1e415d;
  --color-code-text: #fff;
  --color-code-keyword: #ffd43b;
  --color-code-string: #98c379;
  --color-code-comment: #7f8c8d;
  --color-code-number: #e5c07b;
  --color-code-function: #61afef;
  --color-code-prompt: #999;
  --font-primary: 'Source Sans Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  --font-heading: 'Source Sans Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  --font-mono: Consolas, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', monospace;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 32px;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
  --max-width: 1200px;
  --container-padding: 20px;
  --top-nav-height: 40px;
  --header-height: 80px;
  --main-nav-height: 50px;
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;
  --radius-full: 9999px;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal: 300;
}

/* ============================================
   CSS Reset
   ============================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body { min-height: 100vh; line-height: var(--line-height-normal); }
img, picture, video, canvas, svg { display: block; max-width: 100%; }
input, button, textarea, select { font: inherit; }
p, h1, h2, h3, h4, h5, h6 { overflow-wrap: break-word; }
ul, ol { list-style: none; }
a { text-decoration: none; color: inherit; }
button { background: none; border: none; cursor: pointer; }
table { border-collapse: collapse; border-spacing: 0; }

/* ============================================
   Base Styles
   ============================================ */
body { font-family: var(--font-primary); font-size: var(--font-size-base); color: var(--color-text); background-color: var(--color-bg); opacity: 0; transition: opacity 0.3s ease; }
body.loaded { opacity: 1; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--container-padding); }
a { color: var(--color-primary); transition: color var(--transition-fast); }
a:hover { color: var(--color-accent); }
h1, h2, h3, h4, h5, h6 { font-family: var(--font-heading); font-weight: var(--font-weight-bold); line-height: var(--line-height-tight); }
h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
p { margin-bottom: var(--spacing-md); }
p:last-child { margin-bottom: 0; }
code, pre { font-family: var(--font-mono); }
strong { font-weight: var(--font-weight-bold); }
em { font-style: italic; }
section { padding: var(--spacing-xl) 0; }

/* Buttons */
.btn { display: inline-block; padding: var(--spacing-sm) var(--spacing-md); font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); text-align: center; border-radius: var(--radius-sm); transition: all var(--transition-fast); cursor: pointer; }
.btn--donate { background-color: var(--color-accent); color: var(--color-primary-dark); border: none; }
.btn--donate:hover { background-color: var(--color-accent-hover); color: var(--color-primary-dark); }
.btn--primary { background-color: var(--color-primary); color: var(--color-text-white); }
.btn--primary:hover { background-color: var(--color-primary-light); }
.btn--large { padding: 1rem 2rem; font-size: 1.25rem; }

/* Section titles */
.section-title { font-size: var(--font-size-xl); margin-bottom: var(--spacing-md); display: flex; align-items: center; gap: var(--spacing-sm); }
.section-icon { font-size: var(--font-size-lg); }
.section-more { font-size: var(--font-size-sm); margin-left: auto; color: var(--color-primary); }
.section-more:hover { color: var(--color-accent); }

/* ============================================
   Top Navigation Bar
   ============================================ */
.top-nav { background-color: var(--color-primary-dark); height: var(--top-nav-height); display: flex; align-items: center; }
.top-nav__container { max-width: var(--max-width); width: 100%; margin: 0 auto; padding: 0 var(--container-padding); }
.top-nav__list { display: flex; align-items: center; gap: var(--spacing-lg); }
.top-nav__item a { color: var(--color-text-muted); font-size: var(--font-size-sm); font-weight: var(--font-weight-medium); transition: color var(--transition-fast); padding: var(--spacing-sm) 0; display: block; }
.top-nav__item:first-child a { color: var(--color-text-white); font-weight: var(--font-weight-bold); }
.top-nav__item a:hover { color: var(--color-accent); }

/* ============================================
   Header
   ============================================ */
.header { background-color: var(--color-primary-dark); padding: var(--spacing-md) 0; }
.header__container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--container-padding); display: flex; align-items: center; justify-content: space-between; }
.header__logo { flex-shrink: 0; }
.header__logo-img { height: 60px; width: auto; }
.header__actions { display: flex; align-items: center; gap: var(--spacing-md); }
.search-form { display: flex; align-items: center; background-color: rgba(255,255,255,0.1); border-radius: var(--radius-sm); overflow: hidden; }
.search-form__input { background: transparent; border: none; color: var(--color-text-white); padding: var(--spacing-sm) var(--spacing-md); width: 150px; font-size: var(--font-size-sm); }
.search-form__input::placeholder { color: var(--color-text-muted); }
.search-form__input:focus { outline: none; }
.search-form__btn { background-color: var(--color-primary); color: var(--color-text-white); padding: var(--spacing-sm) var(--spacing-md); font-size: var(--font-size-sm); font-weight: var(--font-weight-bold); border: none; cursor: pointer; transition: background-color var(--transition-fast); }
.search-form__btn:hover { background-color: var(--color-primary-light); }
.social-links { display: flex; align-items: center; gap: var(--spacing-sm); position: relative; }
.social-links__toggle { color: var(--color-text-muted); font-size: var(--font-size-sm); padding: var(--spacing-xs); background: none; border: none; cursor: pointer; }
.social-links__toggle:hover { color: var(--color-text-white); }
.social-links__dropdown { position: absolute; top: 100%; right: 0; background: var(--color-primary-dark); border-radius: var(--radius-sm); box-shadow: var(--shadow-md); min-width: 120px; z-index: var(--z-dropdown); }
.social-links__dropdown a { display: block; padding: var(--spacing-sm) var(--spacing-md); color: var(--color-text-muted); font-size: var(--font-size-sm); }
.social-links__dropdown a:hover { background: rgba(255,255,255,0.1); color: var(--color-text-white); }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

/* ============================================
   Main Navigation
   ============================================ */
.main-nav { background-color: var(--color-primary); height: var(--main-nav-height); display: flex; align-items: center; }
.main-nav__container { max-width: var(--max-width); width: 100%; margin: 0 auto; padding: 0 var(--container-padding); }
.main-nav__list { display: flex; align-items: center; }
.main-nav__item { position: relative; }
.main-nav__item > a { display: block; color: var(--color-text-white); font-size: var(--font-size-base); font-weight: var(--font-weight-medium); padding: var(--spacing-md) var(--spacing-lg); transition: background-color var(--transition-fast); }
.main-nav__item > a:hover, .main-nav__item--active > a { background-color: var(--color-primary-dark); color: var(--color-text-white); }
.main-nav__dropdown { position: absolute; top: 100%; left: 0; min-width: 200px; background-color: var(--color-primary); box-shadow: var(--shadow-md); opacity: 0; visibility: hidden; transform: translateY(-10px); transition: all var(--transition-fast); z-index: var(--z-dropdown); }
.main-nav__item:hover .main-nav__dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.main-nav__dropdown li a { display: block; padding: var(--spacing-sm) var(--spacing-md); color: var(--color-text-white); font-size: var(--font-size-sm); transition: background-color var(--transition-fast); }
.main-nav__dropdown li a:hover { background-color: var(--color-primary-dark); }
.mobile-nav-toggle { display: none; flex-direction: column; gap: 4px; padding: var(--spacing-sm); }
.mobile-nav-toggle__bar { width: 24px; height: 2px; background: var(--color-text-white); transition: all var(--transition-fast); }

/* ============================================
   Hero Section
   ============================================ */
.hero { background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-primary-dark) 100%); }
.hero__container { max-width: var(--max-width); margin: 0 auto; padding: var(--spacing-xl) var(--container-padding); position: relative; }
.hero__carousel { margin-bottom: var(--spacing-lg); position: relative; }
.hero__slide { display: none; grid-template-columns: 1fr 1fr; gap: var(--spacing-2xl); align-items: stretch; }
.hero__slide--active { display: grid; }
.hero__shell-btn { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); background-color: rgba(45,97,140,0.95); border: none; color: var(--color-text-white); padding: 8px 14px; border-radius: var(--radius-sm); display: flex; align-items: center; gap: 6px; font-size: 13px; cursor: pointer; transition: all var(--transition-fast); z-index: 10; text-decoration: none; }
.hero__shell-btn:hover { background-color: var(--color-accent); color: var(--color-primary-dark); }
.hero__shell-btn .shell-icon { font-family: var(--font-mono); font-weight: bold; font-size: 14px; }
.hero__code { background-color: var(--color-code-bg); border-radius: var(--radius-sm); padding: var(--spacing-lg); overflow-x: auto; min-height: 280px; }
.hero__code pre { margin: 0; }
.hero__code code { font-family: var(--font-mono); font-size: 13px; line-height: 1.6; color: var(--color-code-text); white-space: pre; }
.hero__code .comment { color: var(--color-code-comment); }
.hero__code .keyword { color: var(--color-code-keyword); }
.hero__code .string { color: var(--color-code-string); }
.hero__code .number { color: var(--color-code-number); }
.hero__code .function, .hero__code .builtin { color: var(--color-code-function); }
.hero__code .prompt { color: var(--color-code-prompt); }
.hero__code .output { color: var(--color-code-text); }
.hero__code .class { color: #e5c07b; }
.hero__content { color: var(--color-text-white); padding: var(--spacing-lg); }
.hero__content h1 { font-size: var(--font-size-xl); margin-bottom: var(--spacing-md); color: var(--color-accent); font-weight: var(--font-weight-bold); }
.hero__content p { font-size: var(--font-size-sm); line-height: var(--line-height-relaxed); color: rgba(255,255,255,0.85); }
.hero__content a { color: var(--color-accent); }
.hero__content a:hover { text-decoration: underline; }
.hero__indicators { display: flex; justify-content: center; gap: var(--spacing-xs); margin-top: var(--spacing-lg); }
.hero__indicator { width: 28px; height: 28px; border: 1px solid rgba(255,255,255,0.5); background: transparent; color: rgba(255,255,255,0.7); font-size: var(--font-size-sm); font-weight: var(--font-weight-medium); cursor: pointer; transition: all var(--transition-fast); }
.hero__indicator:hover { border-color: var(--color-text-white); color: var(--color-text-white); }
.hero__indicator--active { background-color: var(--color-text-white); color: var(--color-primary-dark); border-color: var(--color-text-white); }
.hero__tagline { background-color: var(--color-primary); padding: var(--spacing-lg) 0; text-align: center; }
.hero__tagline-container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--container-padding); }
.hero__tagline p { color: var(--color-text-white); font-size: var(--font-size-lg); margin: 0; }
.hero__tagline a { color: var(--color-accent); font-weight: var(--font-weight-bold); }
.hero__tagline a:hover { text-decoration: underline; }

/* ============================================
   Quick Links Section
   ============================================ */
.quick-links { background-color: var(--color-bg); padding: var(--spacing-2xl) 0; }
.quick-links__container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--container-padding); }
.quick-links__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
.quick-link { padding: var(--spacing-md) var(--spacing-lg); border-left: 1px solid var(--color-border); transition: border-color var(--transition-fast); }
.quick-link:first-child { border-left: none; padding-left: 0; }
.quick-link:last-child { padding-right: 0; }
.quick-link:hover .quick-link__title { color: var(--color-accent); }
.quick-link__title { font-size: var(--font-size-base); font-weight: var(--font-weight-bold); color: var(--color-text); margin-bottom: var(--spacing-sm); display: flex; align-items: center; gap: var(--spacing-sm); transition: color var(--transition-fast); }
.quick-link__icon { color: var(--color-text-white); background-color: var(--color-primary); font-size: 11px; width: 22px; height: 22px; display: inline-flex; align-items: center; justify-content: center; border-radius: 50%; flex-shrink: 0; }
.quick-link__desc { font-size: var(--font-size-sm); color: var(--color-text-light); line-height: var(--line-height-relaxed); margin-bottom: var(--spacing-sm); }
.quick-link__link { color: var(--color-primary); font-size: var(--font-size-sm); }
.quick-link__link:hover { color: var(--color-accent); text-decoration: underline; }

/* ============================================
   News and Events Section
   ============================================ */
.news-events { background-color: var(--color-bg); padding: var(--spacing-xl) 0; }
.news-events__container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--container-padding); display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--spacing-2xl); }
.news-events__column { padding: var(--spacing-lg); border: 1px solid var(--color-border); background-color: var(--color-bg); }
.news-events__title { font-size: var(--font-size-base); font-weight: var(--font-weight-bold); color: var(--color-text); margin-bottom: var(--spacing-md); display: flex; align-items: center; gap: var(--spacing-sm); padding-bottom: var(--spacing-sm); border-bottom: 1px solid var(--color-border); }
.news-events__icon { color: var(--color-text-white); background-color: var(--color-primary); font-size: 10px; width: 20px; height: 20px; display: inline-flex; align-items: center; justify-content: center; border-radius: 50%; }
.news-events__more { font-size: var(--font-size-sm); margin-left: auto; color: var(--color-primary); font-weight: var(--font-weight-normal); }
.news-events__more:hover { color: var(--color-accent); }
.news-list, .events-list { display: flex; flex-direction: column; }
.news-item, .event-item { display: flex; gap: var(--spacing-md); align-items: flex-start; padding: var(--spacing-sm) 0; border-bottom: 1px solid var(--color-border-light); }
.news-item:last-child, .event-item:last-child { border-bottom: none; }
.news-item time, .event-item time { flex-shrink: 0; font-size: var(--font-size-sm); color: var(--color-text-muted); min-width: 85px; }
.news-item a, .event-item a { font-size: var(--font-size-sm); color: var(--color-primary); line-height: var(--line-height-normal); }
.news-item a:hover, .event-item a:hover { color: var(--color-accent); text-decoration: underline; }

/* ============================================
   Success Stories Section
   ============================================ */
.stories-usage { background-color: var(--color-bg); padding: var(--spacing-xl) 0; }
.stories-usage__container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--container-padding); display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--spacing-2xl); }
.stories-usage__column { padding: var(--spacing-lg); border: 1px solid var(--color-border); background-color: var(--color-bg); }
.success-stories .section-title, .use-python .section-title { font-size: var(--font-size-base); font-weight: var(--font-weight-bold); margin-bottom: var(--spacing-md); padding-bottom: var(--spacing-sm); border-bottom: 1px solid var(--color-border); }
.success-stories .section-title .section-icon, .use-python .section-title .section-icon { color: var(--color-text-white); background-color: var(--color-primary); font-size: 10px; width: 20px; height: 20px; display: inline-flex; align-items: center; justify-content: center; border-radius: 50%; }
.success-quote { background-color: var(--color-accent); padding: var(--spacing-md); margin-bottom: var(--spacing-md); border-left: 4px solid var(--color-primary-dark); }
.success-quote a { color: var(--color-primary-dark); font-size: var(--font-size-sm); line-height: var(--line-height-relaxed); font-style: italic; }
.success-quote a:hover { text-decoration: underline; }
.success-source { font-size: var(--font-size-sm); color: var(--color-text-light); }
.success-source a { color: var(--color-primary); display: block; margin-bottom: var(--spacing-xs); }
.success-source a:hover { color: var(--color-accent); }
.success-source em { color: var(--color-text-muted); font-size: var(--font-size-xs); }

/* ============================================
   Use Python Section
   ============================================ */
.use-list { display: flex; flex-direction: column; }
.use-list li { font-size: var(--font-size-sm); line-height: 2.2; padding: var(--spacing-xs) 0; border-bottom: 1px solid var(--color-border-light); }
.use-list li:last-child { border-bottom: none; }
.use-list strong { color: var(--color-text); margin-right: var(--spacing-xs); font-weight: var(--font-weight-normal); }
.use-links { color: var(--color-text-light); }
.use-links a { color: var(--color-primary); background-color: var(--color-bg-alt); padding: 2px 8px; border-radius: var(--radius-sm); font-size: 11px; margin: 2px; display: inline-block; border: 1px solid var(--color-border); text-decoration: none; }
.use-links a:hover { background-color: var(--color-primary); color: var(--color-text-white); border-color: var(--color-primary); }

/* ============================================
   PSF Section
   ============================================ */
.psf-section { background-color: var(--color-primary); padding: var(--spacing-2xl) 0; position: relative; overflow: hidden; }
.psf-section__container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--container-padding); position: relative; z-index: 1; }
.psf-section__title { font-size: var(--font-size-lg); color: var(--color-accent); margin-bottom: var(--spacing-md); text-align: left; }
.psf-section__title a { color: var(--color-text-white); }
.psf-section__title a:hover { text-decoration: underline; }
.psf-section__desc { color: var(--color-text-white); font-size: var(--font-size-sm); line-height: var(--line-height-relaxed); margin-bottom: var(--spacing-lg); max-width: 600px; text-align: left; }
.psf-section__desc a { color: var(--color-accent); }
.psf-section__buttons { display: flex; gap: var(--spacing-md); justify-content: flex-start; }
.btn--psf { background-color: transparent; border: 2px solid var(--color-accent); color: var(--color-accent); padding: var(--spacing-sm) var(--spacing-lg); font-weight: var(--font-weight-bold); font-size: var(--font-size-sm); }
.btn--psf:hover { background-color: var(--color-accent); color: var(--color-primary-dark); }
.psf-section__logo { position: absolute; right: 10%; top: 50%; transform: translateY(-50%); width: 180px; height: 180px; opacity: 0.6; }
.psf-section__logo img { width: 100%; height: 100%; }

/* ============================================
   Footer
   ============================================ */
.footer { background-color: var(--color-primary-dark); color: var(--color-text-white); }
.footer__container { max-width: var(--max-width); margin: 0 auto; padding: var(--spacing-xl) var(--container-padding); }
.footer__columns { display: grid; grid-template-columns: repeat(8, 1fr); gap: var(--spacing-md); }
.footer__column h3 { font-size: var(--font-size-xs); font-weight: var(--font-weight-bold); margin-bottom: var(--spacing-sm); text-transform: uppercase; }
.footer__column h3 a { color: var(--color-accent); }
.footer__column h3 a:hover { text-decoration: underline; }
.footer__column ul { display: flex; flex-direction: column; gap: 2px; }
.footer__column li a { font-size: 11px; color: var(--color-text-muted); transition: color var(--transition-fast); line-height: 1.4; }
.footer__column li a:hover { color: var(--color-text-white); }
.footer__bottom { background-color: rgba(0,0,0,0.2); padding: var(--spacing-lg) 0; }
.footer__bottom-container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--container-padding); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: var(--spacing-md); }
.footer__links { display: flex; gap: var(--spacing-lg); }
.footer__links li a { font-size: var(--font-size-xs); color: var(--color-text-muted); }
.footer__links li a:hover { color: var(--color-text-white); }
.footer__copyright { font-size: var(--font-size-xs); color: var(--color-text-muted); }
.footer__copyright a { color: var(--color-text-muted); margin-left: var(--spacing-sm); }
.footer__copyright a:hover { color: var(--color-text-white); }

/* ============================================
   Page Layout
   ============================================ */
.page-content { background-color: var(--color-bg); padding: var(--spacing-xl) 0; }
.page-content__container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--container-padding); display: grid; grid-template-columns: 220px 1fr; gap: var(--spacing-xl); }
.sidebar { background-color: var(--color-bg-alt); padding: var(--spacing-lg); border-radius: var(--radius-md); height: fit-content; }
.sidebar h3 { font-size: var(--font-size-lg); color: var(--color-primary-dark); margin-bottom: var(--spacing-md); padding-bottom: var(--spacing-sm); border-bottom: 2px solid var(--color-accent); }
.sidebar__menu { display: flex; flex-direction: column; gap: var(--spacing-xs); }
.sidebar__menu li a { display: block; padding: var(--spacing-sm) 0; color: var(--color-text); font-size: var(--font-size-sm); border-bottom: 1px solid var(--color-border-light); transition: all var(--transition-fast); }
.sidebar__menu li a:hover { color: var(--color-primary); padding-left: var(--spacing-sm); }
.sidebar__menu li:last-child a { border-bottom: none; }
.page-main { min-height: 400px; }
.page-main h1 { font-size: var(--font-size-3xl); color: var(--color-primary-dark); margin-bottom: var(--spacing-lg); padding-bottom: var(--spacing-md); border-bottom: 3px solid var(--color-accent); }
.page-intro { font-size: var(--font-size-lg); color: var(--color-text-light); margin-bottom: var(--spacing-xl); padding: var(--spacing-lg); background-color: var(--color-bg-alt); border-left: 4px solid var(--color-primary); border-radius: var(--radius-sm); }
.page-section { margin-bottom: var(--spacing-xl); }
.page-section h2 { font-size: var(--font-size-xl); color: var(--color-primary-dark); margin-bottom: var(--spacing-md); }
.page-section p { line-height: var(--line-height-relaxed); margin-bottom: var(--spacing-md); }
.page-section ul { margin-left: var(--spacing-lg); margin-bottom: var(--spacing-md); }
.page-section ul li { list-style: disc; margin-bottom: var(--spacing-sm); line-height: var(--line-height-normal); }
.page-section a { color: var(--color-primary); }
.page-section a:hover { text-decoration: underline; }
.news-list-page li { display: flex; gap: var(--spacing-md); padding: var(--spacing-sm) 0; border-bottom: 1px solid var(--color-border-light); }
.news-list-page time { color: var(--color-text-muted); font-size: var(--font-size-sm); min-width: 90px; }
.news-list-page a { color: var(--color-primary); font-size: var(--font-size-sm); }
.download-hero { background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%); padding: 2rem; border-radius: 8px; margin-bottom: 2rem; color: white; }
.download-hero h2 { color: white; margin-bottom: 1rem; }
.download-hero__note { margin-top: 1rem; font-size: 0.9rem; opacity: 0.9; }
.download-hero__note a { color: var(--color-accent); }
.releases-table { width: 100%; border-collapse: collapse; }
.releases-table th, .releases-table td { padding: 0.75rem; text-align: left; border-bottom: 1px solid #eee; }
.releases-table th { background: #f5f5f5; font-weight: 600; }

/* ============================================
   Loading States
   ============================================ */
.loading-indicator { color: #666; font-style: italic; padding: 1rem; }
.skeleton { background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%); background-size: 200% 100%; animation: skeleton-loading 1.5s ease-in-out infinite; border-radius: 4px; }
@keyframes skeleton-loading { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }
.fade-in { animation: fadeIn 0.3s ease-out; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; } }

/* ============================================
   Responsive Styles
   ============================================ */
@media (max-width: 1023px) {
  .quick-links__grid { grid-template-columns: repeat(2, 1fr); }
  .footer__columns { grid-template-columns: repeat(4, 1fr); }
  .hero__slide { grid-template-columns: 1fr; gap: var(--spacing-lg); }
  .hero__code { order: 1; }
  .hero__content { order: 2; }
}
@media (max-width: 767px) {
  :root { --container-padding: 15px; }
  .top-nav__list { gap: var(--spacing-md); flex-wrap: wrap; justify-content: center; }
  .header__container { flex-direction: column; gap: var(--spacing-md); }
  .header__actions { width: 100%; justify-content: center; flex-wrap: wrap; }
  .search-form__input { width: 120px; }
  .main-nav__list { flex-wrap: wrap; justify-content: center; }
  .main-nav__item > a { padding: var(--spacing-sm) var(--spacing-md); font-size: var(--font-size-sm); }
  .hero__slide { grid-template-columns: 1fr; }
  .hero__code code { font-size: var(--font-size-xs); }
  .hero__content h1 { font-size: var(--font-size-xl); }
  .hero__tagline p { font-size: var(--font-size-base); }
  .quick-links__grid { grid-template-columns: 1fr; }
  .quick-link { border-left: none; border-bottom: 1px solid var(--color-border); padding: var(--spacing-md) 0; }
  .quick-link:first-child { padding-left: 0; }
  .news-events__container { grid-template-columns: 1fr; }
  .stories-usage__container { grid-template-columns: 1fr; }
  .footer__columns { grid-template-columns: repeat(2, 1fr); }
  .footer__bottom-container { flex-direction: column; text-align: center; }
  .footer__links { flex-wrap: wrap; justify-content: center; }
  .page-content__container { grid-template-columns: 1fr; }
  .sidebar { order: 2; }
}
@media (max-width: 479px) {
  .footer__columns { grid-template-columns: 1fr; }
  .psf-section__buttons { flex-direction: column; }
  .btn--psf { margin-right: 0; margin-bottom: var(--spacing-sm); }
}