/**
 * responsive.css - 统一响应式断点
 * NEGIAO.github.io 模块化 CSS
 *
 * 断点定义（参考 base.css 中的变量）：
 *   --breakpoint-sm:  576px  （手机）
 *   --breakpoint-md:  768px  （平板）
 *   --breakpoint-lg:  1024px （小笔记本）
 *   --breakpoint-xl:  1200px （桌面）
 *   --breakpoint-2xl: 1400px （大屏）
 */

/* ========================
   Large Tablets & Small Laptops (≤1024px)
   ======================== */
@media (max-width: 1024px) {
  .container {
    padding: 0 var(--space-lg);
  }

  .section {
    padding: var(--space-3xl) 0;
  }

  .hero__title {
    font-size: clamp(2.8rem, 5vw, 4rem);
  }

  .navbar__container {
    padding: 0 var(--space-lg);
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
    position: relative;
  }

  .grid--3-fixed {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
  }
}

/* ========================
   Tablets (≤768px)
   ======================== */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-md);
  }

  .section {
    padding: var(--space-2xl) 0;
  }

  .hero__title {
    font-size: clamp(2.2rem, 6vw, 3.5rem);
    margin-bottom: var(--space-sm);
  }

  .hero__subtitle {
    font-size: clamp(1rem, 3vw, 1.25rem);
    padding: 0 var(--space-sm);
    text-align: center;
    margin-bottom: var(--space-lg);
    line-height: 1.5;
  }

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

  .hero__actions {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    max-width: 100%;
    margin: 0 auto;
    padding: 0 var(--space-sm);
  }

  .hero__actions .btn {
    width: auto;
    flex: 0 1 auto;
    padding: var(--space-sm) var(--space-md);
    font-size: 0.85rem;
    min-height: 42px;
  }

  .avatar-container {
    margin: var(--space-md) auto var(--space-lg);
  }

  .hero-tech-badges {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    max-width: 100%;
  }

  .tech-badge {
    width: auto;
    max-width: none;
    justify-content: center;
    padding: var(--space-xs) var(--space-md);
    font-size: 0.8rem;
  }

  .grid--2,
  .grid--3,
  .grid--3-fixed,
  .grid--responsive {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .card {
    padding: var(--space-lg);
    align-items: center;
    justify-content: center;
    text-align: center;
  }

  .footer__content {
    flex-direction: column;
    text-align: center;
    gap: var(--space-lg);
  }

  .footer__navigation {
    margin-bottom: var(--space-lg) !important;
  }

  .footer__navigation nav ul {
    flex-direction: column !important;
    gap: var(--space-sm) !important;
  }

  .footer__brand {
    margin-bottom: var(--space-lg) !important;
  }

  .footer__brand > p {
    font-size: 0.9rem !important;
    padding: 0 var(--space-sm);
  }

  .footer .contact-details {
    padding: var(--space-md) !important;
  }

  .footer .contact-details > div {
    max-width: 100% !important;
  }

  .footer__meta {
    padding-top: var(--space-md) !important;
  }

  .card .contact-icon-container {
    width: 50px !important;
    height: 50px !important;
    margin-bottom: var(--space-md) !important;
  }

  .card .contact-icon-container i {
    font-size: 1.25rem !important;
  }

  .grid--3-fixed .card {
    padding: var(--space-lg);
  }

  .grid--3-fixed .card h4 {
    font-size: 1.1rem;
    margin-bottom: var(--space-xs);
  }

  .grid--3-fixed .card p {
    font-size: 0.85rem;
    line-height: 1.5;
  }

  .back-to-top {
    border: 2.5px solid var(--border);
    bottom: 20px;
    right: 50px;
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }

  h1 {
    font-size: clamp(1.8rem, 5vw, 2.5rem);
  }

  h2 {
    font-size: clamp(1.5rem, 4vw, 2rem);
  }

  h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
  }

  .footer__navigation ul {
    flex-direction: column;
    gap: var(--space-md) !important;
  }

  .footer__navigation ul li a {
    display: block;
    padding: var(--space-sm) var(--space-md) !important;
    background: rgba(0, 217, 255, 0.05);
    border-radius: var(--radius-md);
    border: 1px solid rgba(0, 217, 255, 0.1);
  }

  .footer__navigation ul li a:hover {
    background: rgba(0, 217, 255, 0.1);
    border-color: rgba(0, 217, 255, 0.3);
    color: var(--primary);
  }
}

/* ========================
   Mobile Phones (≤576px)
   ======================== */
@media (max-width: 576px) {
  .container {
    padding: 0 var(--space-sm);
  }

  .section {
    padding: var(--space-xl) 0;
  }

  .hero__title {
    font-size: clamp(2rem, 8vw, 3rem);
    line-height: 1;
    margin-bottom: var(--space-xs);
  }

  .hero__subtitle {
    font-size: clamp(0.95rem, 4vw, 1.125rem);
    margin-bottom: var(--space-md);
    padding: 0;
  }

  .hero__subtitle img {
    max-width: 90%;
    height: auto;
  }

  .avatar-container {
    margin: var(--space-sm) auto var(--space-md);
  }

  .hero-tech-badges {
    margin-bottom: var(--space-md);
    gap: var(--space-xs);
  }

  .tech-badge {
    font-size: 0.75rem;
    padding: var(--space-xs) var(--space-sm);
  }

  .hero__actions {
    flex-direction: column;
    gap: var(--space-sm);
    padding: 0 var(--space-md);
    max-width: 100%;
  }

  .hero__actions .btn {
    width: 100%;
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.85rem;
  }

  .btn--small {
    padding: var(--space-xs) var(--space-md);
    font-size: 0.75rem;
  }

  .card {
    padding: var(--space-lg);
    border-radius: var(--radius-md);
  }

  .navbar__container {
    height: 3.5rem;
    padding: 0 var(--space-sm);
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-sm);
    position: relative;
  }

  .navbar__brand {
    font-size: 1.15rem;
  }

  .floating-shapes {
    display: none;
  }

  .project-item {
    padding: var(--space-lg);
  }

  .project-title {
    font-size: 1.15rem;
  }

  .project-desc {
    font-size: 0.875rem;
  }

  .footer {
    padding: var(--space-xl) 0;
  }

  .social-links {
    gap: var(--space-md);
    justify-content: center !important;
  }

  .btn,
  .navbar__link,
  .social-link {
    min-height: 44px;
    min-width: 44px;
  }

  .contact-method {
    flex-direction: column;
    text-align: center;
    padding: var(--space-lg) var(--space-md);
  }

  .contact-icon-container {
    margin-right: 0;
    margin-bottom: var(--space-md);
  }
}

/* ========================
   Extra Small Phones (≤375px)
   ======================== */
@media (max-width: 375px) {
  .hero__title {
    font-size: clamp(1.75rem, 10vw, 2.5rem);
  }

  .hero__subtitle {
    font-size: 0.9rem;
  }

  .hero__subtitle img {
    max-width: 85%;
  }

  .avatar-container {
    margin: var(--space-xs) auto var(--space-sm);
  }

  .tech-badge {
    font-size: 0.7rem;
    padding: 3px var(--space-sm);
  }

  .hero__actions .btn {
    font-size: 0.8rem;
    padding: var(--space-xs) var(--space-md);
    min-height: 40px;
  }

  .project-item {
    padding: var(--space-md);
  }

  .project-number {
    font-size: 1.25rem;
  }

  .project-title {
    font-size: 1.05rem;
  }
}

/* ========================
   High DPI Displays
   ======================== */
@media (-webkit-min-device-pixel-ratio: 2),
(min-resolution: 192dpi) {
  .avatar {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
  }
}

/* ========================
   Reduced Motion
   ======================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .floating-shapes,
  .avatar-glow,
  .avatar-ring {
    display: none;
  }
}

/* ========================
   Print Styles
   ======================== */
@media print {
  :root {
    --background: #ffffff;
    --text: #000000;
    --text-secondary: #333333;
    --surface: #ffffff;
    --border: #cccccc;
  }

  body {
    background: white;
    color: black;
  }

  .navbar,
  .mobile-menu-toggle,
  .back-to-top,
  #toc-toggle,
  .loading-screen,
  .floating-shapes,
  .hero::before,
  .hero::after {
    display: none !important;
  }

  .container {
    width: 100%;
    max-width: none;
    padding: 0;
    margin: 0;
  }

  .card,
  .note-content,
  .schedule-container {
    box-shadow: none;
    border: 1px solid #ddd;
    background: white;
    color: black;
  }

  a {
    text-decoration: underline;
    color: black;
  }

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666;
  }

  .avatar-glow,
  .floating-shapes,
  .hero__actions {
    display: none;
  }
}

/* ========================
   Accessibility
   ======================== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

*:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: var(--radius-xs);
}