/* ==========================================================================
   CSS Reset & Base Settings
   ========================================================================== */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&family=Noto+Serif+SC:wght@400;700&family=ZCOOL+KuaiLe&display=swap');

:root {
  /* Design Tokens */
  --color-bg-paper: #FFFDF8;
  --color-primary: #4DB6AC;
  --color-primary-light: #B2DFDB;
  --color-primary-dark: #00897B;
  --color-text-main: #3E2723;
  --color-text-light: #6D4C41;
  --color-border: #D7CCC8;
  --color-white: #FFFFFF;
  --color-risk: #FFCC80;

  --font-title: 'Noto Serif SC', serif;
  --font-body: 'Noto Sans SC', sans-serif;
  --font-handwriting: 'ZCOOL KuaiLe', cursive;

  --shadow-sm: 0 2px 8px rgba(62, 39, 35, 0.04);
  --shadow-md: 0 6px 16px rgba(62, 39, 35, 0.08);
  --shadow-polaroid: 0 10px 24px rgba(62, 39, 35, 0.15);

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  --transition-base: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--color-text-main);
  background-color: var(--color-bg-paper);
  line-height: 1.75;
  position: relative;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* 纸张纹理背景 */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: -1;
  opacity: 0.4;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.05'/%3E%3C/svg%3E");
}

/* ==========================================================================
   Typography System
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-title);
  color: var(--color-text-main);
  line-height: 1.35;
  margin-bottom: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

h1 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h2 { font-size: clamp(1.35rem, 2.5vw, 2rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.35rem); }
h4 { font-size: 1.1rem; }

.title-handwriting {
  font-family: var(--font-handwriting);
  font-weight: normal;
  letter-spacing: 0.08em;
}

p {
  margin-bottom: 1rem;
  line-height: 1.8;
}

a {
  color: var(--color-primary-dark);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

strong {
  font-weight: 600;
  color: var(--color-text-main);
}

small {
  font-size: 0.82em;
  color: var(--color-text-light);
}

/* ==========================================================================
   Layout Utilities
   ========================================================================== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

/* ==========================================================================
   Navigation — matches Navigation.astro class names
   ========================================================================== */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(255,253,248,0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px dashed var(--color-border);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-logo {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  line-height: 1.15;
  flex-shrink: 0;
}

.logo-text {
  font-family: var(--font-handwriting);
  font-size: 1.5rem;
  color: var(--color-primary-dark);
  letter-spacing: 2px;
}

.logo-sub {
  font-size: 0.62rem;
  color: var(--color-text-light);
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
  flex: 1;
  /* nav-links is a <nav> element containing <a> tags directly */
}

.nav-link {
  font-family: var(--font-title);
  font-size: 0.875rem;
  color: var(--color-text-light);
  text-decoration: none;
  position: relative;
  padding: 0.25rem 0;
  white-space: nowrap;
  transition: color 0.22s;
  flex-shrink: 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--color-primary);
  transition: width 0.25s ease;
}

.nav-link:hover {
  color: var(--color-primary-dark);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-cta {
  /* Push to far right without margin-left: auto — flex-shrink prevents wrap */
  white-space: nowrap;
  background: var(--color-primary);
  color: var(--color-white) !important;
  padding: 0.45rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-family: var(--font-title);
  font-weight: 700;
  text-decoration: none;
  transition: background 0.22s, transform 0.22s;
  flex-shrink: 0;
  margin-left: auto;
}

.nav-cta:hover {
  background: var(--color-primary-dark);
  color: var(--color-white);
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.4rem;
  flex-direction: column;
  gap: 5px;
  margin-left: 0.5rem;
  flex-shrink: 0;
}

.hamburger {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text-main);
  border-radius: 1px;
  transition: transform 0.25s, opacity 0.25s;
}

/* Mobile menu — hidden by default, shown via JS class */
.mobile-menu {
  display: none !important;
  background: var(--color-bg-paper);
  border-bottom: 1px solid var(--color-border);
  padding: 0.75rem 1.5rem 1.25rem;
}

.mobile-menu.is-open {
  display: block !important;
}

.mobile-nav-link {
  display: block;
  padding: 0.7rem 0;
  font-size: 0.95rem;
  font-family: var(--font-title);
  color: var(--color-text-main);
  text-decoration: none;
  border-bottom: 1px dashed var(--color-border);
}

.mobile-nav-link:hover {
  color: var(--color-primary-dark);
}

.mobile-nav-cta {
  display: block;
  margin-top: 1rem;
  text-align: center;
  background: var(--color-primary);
  color: var(--color-white);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-title);
  font-weight: 700;
  text-decoration: none;
}

/* ==========================================================================
   Footer — matches Footer.astro class names
   ========================================================================== */
.site-footer {
  background: var(--color-text-main);
  color: var(--color-bg-paper);
  padding: 3.5rem 0 0;
  border-top: 4px solid var(--color-primary);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem 2.5rem;
  display: grid;
  grid-template-columns: 1.5fr 2fr;
  gap: 3rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.footer-logo {
  font-family: var(--font-handwriting);
  font-size: 1.75rem;
  color: var(--color-primary-light);
  letter-spacing: 3px;
  text-decoration: none;
}

.footer-desc {
  font-size: 0.82rem;
  color: rgba(255,253,248,0.6);
  line-height: 1.7;
  margin: 0;
}

.footer-disclosure {
  font-size: 0.78rem;
  color: rgba(255,253,248,0.45);
  line-height: 1.65;
  background: rgba(255,255,255,0.05);
  border-left: 3px solid var(--color-primary);
  padding: 0.55rem 0.7rem;
  margin: 0;
  border-radius: 0 2px 2px 0;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.footer-col h3 {
  font-family: var(--font-handwriting);
  font-size: 0.95rem;
  color: var(--color-primary-light);
  margin-bottom: 0.75rem;
  letter-spacing: 1px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.footer-col a {
  font-size: 0.82rem;
  color: rgba(255,253,248,0.5);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-col a:hover {
  color: var(--color-primary-light);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 1.1rem 1.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.footer-bottom p {
  font-size: 0.78rem;
  color: rgba(255,253,248,0.32);
  margin: 0;
}

/* Responsive for footer */
@media (max-width: 900px) {
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .footer-links {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links { display: none !important; }
  .nav-cta { display: none !important; }
  .nav-toggle { display: flex !important; }
  .footer-links { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Button System
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-title);
  font-weight: 700;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
  border: 2px solid transparent;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  color: var(--color-white);
}

.btn-primary:focus-visible {
  outline: 3px dashed var(--color-primary-light);
  outline-offset: 4px;
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: none;
}

.btn-outline {
  background-color: transparent;
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
}

.btn-outline:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.btn-secondary {
  background-color: var(--color-white);
  border: 2px solid var(--color-border);
  color: var(--color-text-main);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
  background-color: var(--color-bg-paper);
}

.btn-lg {
  padding: 0.9rem 2rem;
  font-size: 1rem;
}

/* ==========================================================================
   Breadcrumbs — matches Breadcrumb.astro structure (nav > ol > li)
   ========================================================================== */
.breadcrumb {
  padding: 0.75rem 0;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  gap: 0.25rem;
  align-items: center;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  color: var(--color-text-light);
}

.breadcrumb a {
  color: var(--color-primary-dark);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
  text-underline-offset: 2px;
}

.breadcrumb-sep {
  color: var(--color-border);
  font-size: 1rem;
}

/* ==========================================================================
   Card System
   ========================================================================== */
.card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

/* ==========================================================================
   Decorations
   ========================================================================== */
/* 胶带便签 */
.tape-label {
  position: relative;
  background: #FEF9E7;
  padding: 1rem;
  font-family: var(--font-handwriting);
  color: var(--color-text-main);
  box-shadow: var(--shadow-sm);
  transform: rotate(-2deg);
  display: inline-block;
  margin: 1rem;
}

.tape-label::before {
  content: '';
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%) rotate(2deg);
  width: 60px;
  height: 25px;
  background-color: rgba(255, 255, 255, 0.4);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  backdrop-filter: blur(2px);
  border: 1px solid rgba(255,255,255,0.5);
}

/* 拍立得相框 */
.polaroid-frame {
  background: var(--color-white);
  padding: 1rem 1rem 3rem 1rem;
  box-shadow: var(--shadow-polaroid);
  transform: rotate(3deg);
  transition: transform var(--transition-base);
  width: fit-content;
  position: relative;
}

.polaroid-frame img {
  width: 100%;
  height: auto;
  display: block;
  background-color: #eee;
}

.polaroid-frame::after {
  content: attr(data-caption);
  position: absolute;
  bottom: 10px;
  left: 0;
  width: 100%;
  text-align: center;
  font-family: var(--font-handwriting);
  font-size: 1.2rem;
  color: var(--color-text-light);
}

.polaroid-frame:hover {
  transform: rotate(0deg) scale(1.02);
  z-index: 10;
}

/* 日记本分页线 */
.diary-lines {
  background-image: linear-gradient(transparent 95%, var(--color-border) 100%);
  background-size: 100% 2rem;
  line-height: 2rem;
}

/* ==========================================================================
   Badges & Dividers
   ========================================================================== */
.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 700;
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.divider {
  height: 1px;
  background: repeating-linear-gradient(to right, var(--color-border) 0, var(--color-border) 5px, transparent 5px, transparent 10px);
  margin: 2rem 0;
  border: none;
}

/* ==========================================================================
   Animation System
   ========================================================================== */
@keyframes fall {
  0% { transform: translateY(-10vh) rotate(0deg); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { transform: translateY(110vh) rotate(360deg); opacity: 0; }
}

.falling-petal {
  position: fixed;
  top: 0;
  width: 15px;
  height: 15px;
  background-color: #F8BBD0;
  border-radius: 15px 0 15px 0;
  opacity: 0;
  pointer-events: none;
  z-index: -1;
  animation: fall 10s linear infinite;
}

.falling-petal:nth-child(2) { left: 20%; animation-delay: 2s; animation-duration: 12s; background-color: #B2DFDB; }
.falling-petal:nth-child(3) { left: 50%; animation-delay: 4s; animation-duration: 8s; }
.falling-petal:nth-child(4) { left: 80%; animation-delay: 1s; animation-duration: 15s; background-color: #D7CCC8;}

@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;
  }
  .falling-petal {
    display: none;
  }
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 992px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .grid-3 {
    grid-template-columns: 1fr;
  }
  
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--color-bg-paper);
    flex-direction: column;
    padding: 1rem;
    box-shadow: var(--shadow-md);
  }
  
  .nav-links.active {
    display: flex;
  }
  
  .hamburger {
    display: block;
  }
}