/* ==========================================================================
   HEALCORE — Global Stylesheet
   Brand: Performance & Recovery for Athletes
   ========================================================================== */

:root {
  /* Brand Colors */
  --color-black: #0a0d0c;
  --color-dark: #111514;
  --color-charcoal: #1b201f;
  --color-white: #ffffff;
  --color-off-white: #f5f7f6;
  --color-mint: #9fc9bf;
  --color-mint-light: #c7e3dc;
  --color-mint-dark: #5f8b81;
  --color-mint-deep: #3f6058;
  --color-gray: #6b7370;
  --color-gray-light: #a9b0ad;
  --color-line: #e4e8e6;

  --font-main: 'Pretendard', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-en: 'Archivo', 'Pretendard', sans-serif;

  --container-width: 1200px;
  --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  color: var(--color-dark);
  background: var(--color-white);
  line-height: 1.7;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

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

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section-pad {
  padding: 120px 0;
}

@media (max-width: 768px) {
  .section-pad {
    padding: 72px 0;
  }
}

/* ==========================================================================
   Typography helpers
   ========================================================================== */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: 0.28em;
  font-weight: 700;
  color: var(--color-mint-deep);
  text-transform: uppercase;
  margin-bottom: 18px;
}

.eyebrow::before {
  content: '';
  width: 28px;
  height: 2px;
  background: var(--color-mint-deep);
  display: inline-block;
}

.section-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: var(--color-black);
}

.section-sub {
  margin-top: 18px;
  font-size: 17px;
  color: var(--color-gray);
  line-height: 1.8;
}

.text-center {
  text-align: center;
}

.section-head {
  max-width: 700px;
  margin-bottom: 60px;
}

.section-head.text-center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 34px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-black);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-mint-deep);
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  background: var(--color-black);
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn-mint {
  background: var(--color-mint-deep);
  color: var(--color-white);
}

.btn-mint:hover {
  background: var(--color-black);
  transform: translateY(-2px);
}

.btn-light {
  background: var(--color-white);
  color: var(--color-black);
}

.btn-light:hover {
  background: var(--color-mint);
  transform: translateY(-2px);
}

/* ==========================================================================
   CTA Section (shared across pages)
   ========================================================================== */

.cta-section {
  background: var(--color-black);
  padding: 110px 0 130px;
  text-align: center;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -30%;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  height: 200%;
  background: radial-gradient(circle, rgba(159, 201, 191, 0.14), transparent 70%);
}

.cta-inner {
  position: relative;
  z-index: 2;
}

.cta-inner h2 {
  font-size: clamp(24px, 4vw, 38px);
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.01em;
}

.cta-inner p {
  margin-top: 18px;
  font-size: 16px;
  color: rgba(255, 255, 255, 0.7);
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 40px;
  flex-wrap: wrap;
}

/* ==========================================================================
   Header / Navigation
   ========================================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 22px 0;
  transition: var(--transition);
  background: transparent;
}

.site-header.is-scrolled {
  background: rgba(95, 139, 129, 0.92);
  backdrop-filter: blur(10px);
  padding: 14px 0;
  box-shadow: 0 4px 30px rgba(63, 96, 88, 0.25);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 48px;
}

.brand-logo {
  display: flex;
  align-items: center;
}

.brand-logo img {
  height: 26px;
  width: auto;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 48px;
}

.main-nav a {
  font-family: var(--font-en);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-white);
  position: relative;
  padding: 6px 0;
  transition: var(--transition);
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-mint);
  transition: var(--transition);
}

.main-nav a:hover::after,
.main-nav a.active::after {
  width: 100%;
}

.main-nav a.active {
  color: var(--color-mint);
}

.site-header.is-scrolled .main-nav a.active,
.site-header.is-scrolled .main-nav a:hover {
  color: var(--color-white);
}

.site-header.is-scrolled .main-nav a::after {
  background: var(--color-white);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 18px;
}

.header-actions .btn {
  padding: 11px 24px;
  font-size: 13px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  cursor: pointer;
  background: none;
  border: none;
  z-index: 1100;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-white);
  transition: var(--transition);
}

/* ==========================================================================
   Page Header (sub pages)
   ========================================================================== */

.page-hero {
  position: relative;
  padding: 200px 0 90px;
  background: var(--color-black);
  color: var(--color-white);
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -10%;
  width: 60%;
  height: 160%;
  background: radial-gradient(circle, rgba(159, 201, 191, 0.18) 0%, rgba(159, 201, 191, 0) 70%);
}

.page-hero .eyebrow {
  color: var(--color-mint);
}

.page-hero .eyebrow::before {
  background: var(--color-mint);
}

.page-hero h1 {
  font-size: clamp(34px, 5vw, 56px);
  font-weight: 800;
  letter-spacing: -0.02em;
  position: relative;
  z-index: 2;
}

.page-hero p {
  margin-top: 20px;
  font-size: 17px;
  color: var(--color-gray-light);
  max-width: 640px;
  position: relative;
  z-index: 2;
}

.breadcrumb {
  position: relative;
  z-index: 2;
  margin-top: 30px;
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--color-gray-light);
}

.breadcrumb a {
  color: var(--color-mint);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  background: var(--color-black);
  color: var(--color-gray-light);
  padding: 80px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 60px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand img {
  height: 24px;
  margin-bottom: 20px;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-gray-light);
  max-width: 320px;
}

.footer-heading {
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-white);
  margin-bottom: 22px;
  font-weight: 700;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  font-size: 14px;
  color: var(--color-gray-light);
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--color-mint);
}

.footer-contact li {
  font-size: 14px;
  margin-bottom: 12px;
  color: var(--color-gray-light);
}

.footer-contact strong {
  color: var(--color-white);
  font-weight: 600;
  margin-right: 6px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 26px;
  font-size: 13px;
  color: var(--color-gray);
  flex-wrap: wrap;
  gap: 10px;
}

.footer-social {
  display: flex;
  gap: 14px;
}

.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.footer-social a:hover {
  background: var(--color-mint);
  border-color: var(--color-mint);
  color: var(--color-black);
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

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

/* ==========================================================================
   Responsive nav
   ========================================================================== */

@media (max-width: 992px) {
  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: min(320px, 80%);
    height: 100vh;
    background: var(--color-black);
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    padding: 40px;
    gap: 32px;
    transition: right 0.4s ease;
    z-index: 1050;
  }

  .main-nav.is-open {
    right: 0;
  }

  .header-actions .btn-outline {
    display: none;
  }
}

/* ==========================================================================
   Utility animation classes
   ========================================================================== */

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.news-loading {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 0;
  color: var(--color-gray);
  font-size: 15px;
}

/* ==========================================================================
   Back to top
   ========================================================================== */

.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-black);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: var(--transition);
  z-index: 900;
  border: none;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-mint-deep);
}