/* ==========================================================================
   每日大赛 (meiridasaia.com.cn) — mrds
   ========================================================================== */

/* --- Design Tokens (CSS Custom Properties) --- */
:root {
  /* Colors */
  --color--base: #ffffff;
  --color--contrast: #000000;
  --color--primary: #9DFF20;
  --color--secondary: #345C00;
  --color--tertiary: #F6F6F6;

  /* Layout */
  --layout--content: 650px;
  --layout--wide: 1200px;

  /* Spacing (fluid, matching TT3 spacing presets) */
  --spacing--30: clamp(1.5rem, 5vw, 2rem);
  --spacing--40: clamp(1.8rem, 1.8rem + ((1vw - 0.48rem) * 2.885), 3rem);
  --spacing--50: clamp(2.5rem, 8vw, 4.5rem);
  --spacing--60: clamp(3.75rem, 10vw, 7rem);
  --spacing--70: clamp(5rem, 5.25rem + ((1vw - 0.48rem) * 9.096), 8rem);
  --spacing--80: clamp(7rem, 14vw, 11rem);

  /* Typography */
  --font--body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  --font--heading: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;

  /* Font sizes (fluid) */
  --font-size--small: clamp(0.875rem, 0.875rem + ((1vw - 0.48rem) * 0.24), 1rem);
  --font-size--medium: clamp(1rem, 1rem + ((1vw - 0.48rem) * 0.24), 1.125rem);
  --font-size--large: clamp(1.75rem, 1.75rem + ((1vw - 0.48rem) * 0.24), 1.875rem);
  --font-size--x-large: 2.25rem;
  --font-size--xx-large: clamp(6.1rem, 6.1rem + ((1vw - 0.48rem) * 7.5), 10rem);
}


/* --- Reset & Base --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  background-color: var(--color--base);
  color: var(--color--contrast);
  font-family: var(--font--body);
  font-size: var(--font-size--medium);
  line-height: 1.6;
  padding-top: var(--spacing--40);
  padding-bottom: var(--spacing--40);
  padding-left: var(--spacing--30);
  padding-right: var(--spacing--30);
}

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


/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font--heading);
  font-weight: 400;
  line-height: 1.4;
}

h1 {
  font-size: 3.625rem;
  line-height: 1.2;
}

h2 {
  font-size: clamp(2.625rem, calc(2.625rem + ((1vw - 0.48rem) * 8.4135)), 3.25rem);
  line-height: 1.2;
}

h3 {
  font-size: var(--font-size--x-large);
}

h4 {
  font-size: var(--font-size--large);
}

h5 {
  font-size: var(--font-size--medium);
  font-weight: 700;
  text-transform: uppercase;
}

h6 {
  font-size: var(--font-size--medium);
  text-transform: uppercase;
}

p {
  margin-bottom: 1.5rem;
}

p:last-child {
  margin-bottom: 0;
}


/* --- Links --- */
a {
  color: var(--color--contrast);
  text-decoration: underline;
  transition: color 0.15s ease, text-decoration 0.15s ease;
}

a:hover {
  text-decoration: none;
}

a:focus {
  text-decoration: underline dashed;
  outline: none;
}

a:active {
  color: var(--color--secondary);
  text-decoration: none;
}


/* --- Buttons --- */
.btn {
  display: inline-block;
  background-color: var(--color--primary);
  color: var(--color--contrast);
  border: none;
  border-radius: 0;
  padding: 0.75rem 1.5rem;
  font-family: var(--font--body);
  font-size: var(--font-size--small);
  font-weight: 400;
  line-height: 1.6;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.btn:hover,
.btn:focus {
  background-color: var(--color--contrast);
  color: var(--color--base);
  text-decoration: none;
}

.btn:active {
  background-color: var(--color--secondary);
  color: var(--color--base);
}

.btn:visited {
  color: var(--color--contrast);
}

.btn--large {
  padding: 1rem 2rem;
  font-size: var(--font-size--medium);
}

.btn--outline {
  background-color: transparent;
  border: 1px solid var(--color--contrast);
  color: var(--color--contrast);
}

.btn--outline:hover,
.btn--outline:focus {
  background-color: var(--color--contrast);
  color: var(--color--base);
}


/* --- Layout Containers --- */
.constrained {
  max-width: var(--layout--content);
  margin-left: auto;
  margin-right: auto;
}

.wide {
  max-width: var(--layout--wide);
  margin-left: auto;
  margin-right: auto;
}

.full-width {
  width: 100%;
}


/* --- Header --- */
.site-header {
  margin-bottom: var(--spacing--50);
}

.site-header__inner {
  max-width: var(--layout--wide);
  margin-left: auto;
  margin-right: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: var(--spacing--40);
  flex-wrap: wrap;
  gap: 1rem;
}

.site-title {
  font-size: var(--font-size--medium);
  font-weight: normal;
  line-height: 1.4;
  margin: 0;
}

.site-title a {
  text-decoration: none;
}

.site-title a:hover {
  text-decoration: underline;
}

.site-title a:focus {
  text-decoration: underline dashed;
}

.site-title a:active {
  color: var(--color--secondary);
  text-decoration: none;
}

/* --- Navigation --- */
.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  list-style: none;
  align-items: center;
}

.site-nav a {
  font-size: var(--font-size--small);
  text-decoration: none;
  color: var(--color--contrast);
}

.site-nav a:hover {
  text-decoration: underline;
}

.site-nav a:focus {
  text-decoration: underline dashed;
}

.site-nav a:active {
  text-decoration: none;
  color: var(--color--secondary);
}


/* --- Hero Section --- */
.hero {
  max-width: var(--layout--wide);
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--spacing--70);
}

.hero__title {
  font-size: var(--font-size--xx-large);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing--40);
}

.hero__subtitle {
  font-size: var(--font-size--large);
  font-weight: 400;
  line-height: 1.4;
  max-width: var(--layout--content);
  margin-bottom: var(--spacing--40);
}

.hero__actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}


/* --- Featured Image / Cover --- */
.cover {
  position: relative;
  width: 100%;
  overflow: hidden;
  background-color: var(--color--contrast);
}

.cover img {
  width: 100%;
  height: clamp(15vw, 30vh, 400px);
  object-fit: cover;
  opacity: 0.5;
}

.cover--tall img {
  height: clamp(30vh, 50vh, 600px);
}


/* --- Content Grid (3-column blog layout) --- */
.post-grid {
  max-width: var(--layout--wide);
  margin-left: auto;
  margin-right: auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing--40);
  margin-bottom: var(--spacing--70);
}

@media (max-width: 900px) {
  .post-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .post-grid {
    grid-template-columns: 1fr;
  }
}

.post-card__image {
  width: 100%;
  height: clamp(15vw, 30vh, 400px);
  object-fit: cover;
  margin-bottom: 1.25rem;
  background-color: var(--color--tertiary);
}

.post-card__title {
  font-size: var(--font-size--x-large);
  font-weight: 400;
  margin-top: 1.25rem;
  margin-bottom: 1.25rem;
}

.post-card__title a {
  text-decoration: none;
}

.post-card__title a:hover {
  text-decoration: underline;
}

.post-card__title a:focus {
  text-decoration: underline dashed;
}

.post-card__title a:active {
  color: var(--color--secondary);
  text-decoration: none;
}

.post-card__excerpt {
  font-size: var(--font-size--medium);
  margin-bottom: 1rem;
}

.post-card__date {
  font-size: var(--font-size--small);
  font-weight: 400;
}

.post-card__date a {
  text-decoration: none;
}

.post-card__date a:hover {
  text-decoration: underline;
}


/* --- Feature Blocks --- */
.features {
  max-width: var(--layout--wide);
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--spacing--70);
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing--40);
}

@media (max-width: 900px) {
  .features__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .features__grid {
    grid-template-columns: 1fr;
  }
}

.feature-card {
  padding: var(--spacing--40);
  background-color: var(--color--tertiary);
}

.feature-card__icon {
  width: 2.5rem;
  height: 2.5rem;
  margin-bottom: 1rem;
  line-height: 1;
  color: var(--color--secondary);
}

.icon {
  display: inline-block;
  width: 1em;
  height: 1em;
  vertical-align: -0.125em;
  fill: currentColor;
  stroke: currentColor;
}

.icon--lg {
  width: 2.5rem;
  height: 2.5rem;
}

.icon--xl {
  width: 3rem;
  height: 3rem;
}

.feature-card__title {
  font-size: var(--font-size--large);
  margin-bottom: 1rem;
}

.feature-card__text {
  font-size: var(--font-size--medium);
}


/* --- CTA Section (matches TT3 call-to-action pattern) --- */
.cta {
  max-width: var(--layout--wide);
  margin-left: auto;
  margin-right: auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing--40);
  align-items: center;
  margin-bottom: var(--spacing--70);
}

@media (max-width: 768px) {
  .cta {
    grid-template-columns: 1fr;
  }
}

.cta__text {
  font-size: var(--font-size--x-large);
  line-height: 1.2;
  margin-bottom: var(--spacing--30);
}

.cta__separator {
  border: none;
  border-top: 1px solid var(--color--contrast);
  width: 100%;
}


/* --- Separator --- */
.separator {
  border: none;
  border-top: 1px solid var(--color--contrast);
  width: 100px;
  margin: var(--spacing--40) auto;
}

.separator--wide {
  width: 100%;
}


/* --- Spacer --- */
.spacer--sm { height: var(--spacing--40); }
.spacer--md { height: var(--spacing--50); }
.spacer--lg { height: var(--spacing--60); }
.spacer--xl { height: var(--spacing--70); }


/* --- Post Content (single page) --- */
.post-content {
  max-width: var(--layout--content);
  margin-left: auto;
  margin-right: auto;
}

.post-content a {
  color: var(--color--secondary);
}

.post-content blockquote {
  border-left: 1px solid inherit;
  padding-left: var(--spacing--30);
  padding-right: var(--spacing--30);
  margin: 1.5rem 0;
}

.post-content blockquote cite {
  font-size: var(--font-size--small);
  font-style: normal;
}


/* --- Pullquote --- */
.pullquote {
  border-top: 1px solid var(--color--contrast);
  border-bottom: 1px solid var(--color--contrast);
  padding: var(--spacing--40) 0;
  margin: var(--spacing--40) 0;
  line-height: 1.3;
  font-size: var(--font-size--large);
}


/* --- Download Section --- */
.download-section {
  max-width: var(--layout--wide);
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--spacing--70);
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing--30);
}

.download-card {
  background-color: var(--color--tertiary);
  padding: var(--spacing--40);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: box-shadow 0.15s ease;
}

.download-card:hover {
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
}

.download-card__icon {
  width: 3rem;
  height: 3rem;
  margin-bottom: 1.5rem;
  color: var(--color--secondary);
}

.download-card__platform {
  font-size: var(--font-size--large);
  font-weight: 400;
  margin-bottom: 0.75rem;
}

.download-card__info {
  font-size: var(--font-size--small);
  margin-bottom: var(--spacing--30);
  color: var(--color--contrast);
  opacity: 0.6;
  line-height: 1.6;
}

.download-card .btn {
  margin-top: auto;
}

@media (max-width: 900px) {
  .download-grid[style*="repeat(3"] {
    grid-template-columns: repeat(2, 1fr) !important;
  }
}

@media (max-width: 600px) {
  .download-grid[style*="repeat(3"],
  .download-grid[style*="repeat(2"] {
    grid-template-columns: 1fr !important;
  }
}


/* --- Stats Row --- */
.stats {
  max-width: var(--layout--wide);
  margin-left: auto;
  margin-right: auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing--30);
  text-align: center;
  margin-bottom: var(--spacing--70);
}

@media (max-width: 768px) {
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

.stat__number {
  font-size: var(--font-size--x-large);
  font-weight: 400;
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

.stat__label {
  font-size: var(--font-size--small);
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.05em;
}


/* --- Footer --- */
.site-footer {
  margin-top: var(--spacing--50);
}

.site-footer__inner {
  max-width: var(--layout--wide);
  margin-left: auto;
  margin-right: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing--40);
  flex-wrap: wrap;
  gap: 1rem;
}

.site-footer__copy {
  font-size: var(--font-size--small);
  text-align: right;
}


/* --- Section Headings --- */
.section-heading {
  max-width: var(--layout--wide);
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--spacing--40);
}


/* --- Photo Wall (美女照片墙 5x3) --- */
.photo-wall {
  max-width: var(--layout--wide);
  margin: 0 auto var(--spacing--70);
}

.photo-wall__grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}

.photo-wall__item {
  position: relative;
  overflow: hidden;
  background-color: var(--color--tertiary);
  aspect-ratio: 3 / 4;
}

.photo-wall__item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.photo-wall__item:hover img {
  transform: scale(1.06);
}

.photo-wall__badge {
  position: absolute;
  bottom: 12px;
  left: 12px;
  background-color: var(--color--primary);
  color: var(--color--contrast);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  letter-spacing: 0.03em;
}

@media (max-width: 900px) {
  .photo-wall__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 600px) {
  .photo-wall__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}


/* --- Page Title (single page style) --- */
.page-title {
  max-width: var(--layout--content);
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--spacing--40);
}


/* --- Breadcrumb --- */
.breadcrumb {
  max-width: var(--layout--wide);
  margin: var(--spacing--30) auto 0;
}

.breadcrumb__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  font-size: var(--font-size--small);
  padding: 0;
  margin: 0;
}

.breadcrumb__list li:not(:last-child)::after {
  content: "/";
  margin-left: 0.4rem;
  color: var(--color--contrast);
  opacity: 0.4;
}

.breadcrumb__list a {
  text-decoration: none;
}

.breadcrumb__list a:hover {
  text-decoration: underline;
}

.breadcrumb__list [aria-current="page"] {
  opacity: 0.6;
}


/* --- Nav Active State --- */
.nav--active {
  text-decoration: underline !important;
  text-underline-offset: 4px;
}


/* --- Utility --- */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mb-0 { margin-bottom: 0; }
.visually-hidden {
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  height: 1px;
  overflow: hidden;
  position: absolute;
  white-space: nowrap;
  width: 1px;
}