/* ===== CSS Reset ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* ===== CSS Variables ===== */
:root {
  --primary-color: #007bff;
  --secondary-color: #6c757d;
  --light-color: #f8f9fa;
  --dark-color: #343a40;
  --white: #ffffff;
  --black: #000000;

  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.6;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 4rem;

  --border-radius: 8px;
  --transition: all 0.3s ease;
}

/* ===== Base Styles ===== */
html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--dark-color);
  background-image: url('assets/bg-mb.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== Header ===== */
.header {
  padding: var(--spacing-md) var(--spacing-sm);
  text-align: center;
}

.title-text {
  max-width: 100%;
  height: auto;
  max-height: 80px;
}

/* ===== Main Content ===== */
.main {
  flex: 1;
  padding: var(--spacing-md) var(--spacing-sm);
  padding-bottom: 120px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
}

/* ===== Links Grid ===== */
.links-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-sm);
  width: 100%;
  max-width: 500px;
}

/* ===== PC Links Grid ===== */
.links-grid-pc {
  display: none;
}

/* ===== Mobile Links Grid ===== */
.links-grid-mobile {
  display: grid;
}

.link-item {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-xs);
}

.link-item:nth-child(4),
.link-item:nth-child(5),
.link-item:nth-child(6) {
  margin-top: var(--spacing-md);
}

/* ===== Circle Container ===== */
.circle-container {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 105px;
  height: 105px;
  border-radius: 50%;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 1), rgba(230, 230, 230, 1));
  border: 1px solid #fff;
  overflow: hidden;
  z-index: 10;
}

.circle-image {
  position: absolute;
  width: 93%;
  height: 93%;
  object-fit: contain;
  transition: var(--transition);
  z-index: 10;
}

.circle-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #4099ff;
  font-weight: 700;
  font-size: 1.3rem;
  z-index: 11;
}

/* ===== Button Container ===== */
.btn-container {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.btn-container a {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  text-decoration: none;
}

.circle-link {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  text-decoration: none;
  cursor: pointer;
}

.btn-image {
  width: 100%;
  max-width: 140px;
  height: auto;
  transition: var(--transition);
  cursor: pointer;
}

.btn-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--white);
  font-weight: bold;
  font-size: 0.8rem;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.btn-image:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

/* ===== Logo Section ===== */
.logo-section {
  position: fixed;
  bottom: 20px;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  max-width: 100%;
  height: 80px;
  padding: 0 var(--spacing-md);
  z-index: 50;
}

.juve-logo {
  width: 100%;
  max-width: 100%;
  height: 100%;
  object-fit: contain;
}

.cskh-button {
  position: fixed;
  right: 20px;
  bottom: 5%;
  width: 80px;
  height: 80px;
  gap: 4px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border-radius: 50%;
  border: 1px solid #97d2fe;
  background: linear-gradient(180deg, #019efb, #0176dc);
  box-shadow: inset 0 -3.55px 4.733px 0 rgba(0, 0, 0, .25);
  -webkit-animation: zoom 2s ease-in-out infinite;
  animation: zoom 2s ease-in-out infinite;
  z-index: 9999;
}

.cskh-image {
  width: 45px;
  height: 45px;
  object-fit: contain;
  -webkit-animation: shake 1.3s infinite;
  animation: shake 1.3s infinite;
  animation-duration: 1.3s;
  animation-timing-function: ease;
  animation-delay: 0s;
  animation-iteration-count: infinite;
  animation-direction: normal;
  animation-fill-mode: none;
  animation-play-state: running;
  animation-name: shake;
}

.cskh-text {
  color: #fff;
  font-size: 0.6rem;
  font-weight: 500;
  text-align: center;
  line-height: 1;
  -webkit-animation: shake 1.3s infinite;
  animation: shake 1.3s infinite;
  animation-duration: 1.3s;
  animation-timing-function: ease;
  animation-delay: 0s;
  animation-iteration-count: infinite;
  animation-direction: normal;
  animation-fill-mode: none;
  animation-play-state: running;
  animation-name: shake;
}

/* ===== Desktop Responsive ===== */
@media (min-width: 769px) {
  body {
    background-image: url('assets/bg-pc.webp');
    background-size: cover;
  }

  .header {
    padding: 20px var(--spacing-md);
    margin-bottom: 20px;
    /* margin-top: 50px; */
  }

  .title-text {
    max-height: 80px;
  }

  .main {
    padding: 0 var(--spacing-md);
    gap: 40px;
    justify-content: flex-start;
    align-items: center;
  }

  /* Show PC links, hide mobile links */
  .links-grid-pc {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    max-width: 1200px;
    gap: 20px;
    align-items: start;
    margin-bottom: 20px;
    margin-top: 20px;
  }

  .links-grid-mobile {
    display: none;
  }

  .link-item {
    gap: 20px;
  }

  .link-item:nth-child(4),
  .link-item:nth-child(5),
  .link-item:nth-child(6) {
    margin-top: 0;
  }

  .circle-container {
    width: 130px;
    height: 130px;
  }

  .circle-text {
    font-size: 1.6rem;
  }

  .btn-image {
    max-width: 160px;
  }

  .btn-text {
    font-size: 1rem;
  }

  .logo-section {
    position: relative;
    bottom: auto;
    height: 80px;
    padding: 0 var(--spacing-lg);
    margin-bottom: 20px;
  }

  .main {
    padding-bottom: var(--spacing-md);
  }
}

/* ===== Mobile Responsive ===== */
@media (max-width: 480px) {
  .header {
    padding: var(--spacing-xs) var(--spacing-sm);
  }

  .title-text {
    max-height: 60px;
  }

  .main {
    padding: var(--spacing-sm);
    gap: var(--spacing-sm);
  }

  .links-grid {
    gap: var(--spacing-xs);
    max-width: 400px;
  }

  .circle-container {
    width: 100px;
    height: 100px;
  }

  .link-item:nth-child(4),
  .link-item:nth-child(5),
  .link-item:nth-child(6) {
    margin-top: var(--spacing-sm);
  }

  .btn-image {
    max-width: 120px;
  }

  .logo-section {
    height: 70px;
  }

  .cskh-button {
    bottom: 12%;
  }
}

@media (max-width: 360px) {
  .links-grid {
    max-width: 350px;
  }

  .link-item:nth-child(4),
  .link-item:nth-child(5),
  .link-item:nth-child(6) {
    margin-top: var(--spacing-sm);
  }

  .circle-container {
    width: 90px;
    height: 90px;
  }

  .btn-image {
    max-width: 110px;
  }

  .title-text {
    max-height: 50px;
  }

  .logo-section {
    height: 60px;
  }
}

@keyframes shake {
  0% {
    transform: rotate(0) scale(1) skew(1deg);
  }

  10% {
    transform: rotate(-25deg) scale(1) skew(1deg);
  }

  20% {
    transform: rotate(25deg) scale(1) skew(1deg);
  }

  30% {
    transform: rotate(-25deg) scale(1) skew(1deg);
  }

  40% {
    transform: rotate(25deg) scale(1) skew(1deg);
  }

  50% {
    transform: rotate(0) scale(1) skew(1deg);
  }

  100% {
    transform: rotate(0) scale(1) skew(1deg);
  }
}

@-webkit-keyframes shake {
  0% {
    -webkit-transform: rotate(0) scale(1) skew(1deg);
  }

  10% {
    -webkit-transform: rotate(-25deg) scale(1) skew(1deg);
  }

  20% {
    -webkit-transform: rotate(25deg) scale(1) skew(1deg);
  }

  30% {
    -webkit-transform: rotate(-25deg) scale(1) skew(1deg);
  }

  40% {
    -webkit-transform: rotate(25deg) scale(1) skew(1deg);
  }

  50% {
    -webkit-transform: rotate(0) scale(1) skew(1deg);
  }

  100% {
    -webkit-transform: rotate(0) scale(1) skew(1deg);
  }
}

@keyframes zoom {

  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.05);
  }
}

@-webkit-keyframes zoom {

  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.05);
  }
}