/* ===================================
   POSA — 자세교정 앞 쿠션 웹사이트
   CSS 스타일시트
=================================== */

/* ── 리셋 & 기본 ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --c-bg: #0e0f11;
  --c-surface: #16181c;
  --c-surface2: #1e2128;
  --c-border: rgba(255,255,255,0.08);
  --c-text: #f0f0f0;
  --c-text-muted: #8a8d96;
  --c-accent1: #a8c5ff;
  --c-accent2: #7b9fff;
  --c-grad-start: #7b9fff;
  --c-grad-end: #c4b5fd;
  --font-sans: 'Noto Sans KR', sans-serif;
  --font-display: 'Outfit', sans-serif;
  --radius: 16px;
  --radius-lg: 24px;
  --transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --shadow-card: 0 8px 40px rgba(0,0,0,0.45);
}

html { scroll-behavior: smooth; }

body {
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-sans);
  line-height: 1.7;
  overflow-x: hidden;
}

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

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

/* ── 공통 유틸 ── */
.gradient-text {
  background: linear-gradient(135deg, var(--c-grad-start), var(--c-grad-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--c-accent2);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-sub {
  font-size: 16px;
  color: var(--c-text-muted);
  max-width: 520px;
  margin: 0 auto;
}

/* ── 버튼 ── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: linear-gradient(135deg, var(--c-grad-start), var(--c-grad-end));
  color: #0e0f11;
  font-weight: 700;
  font-size: 15px;
  border-radius: 50px;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(123, 159, 255, 0.4);
}

.btn-primary.btn-large {
  padding: 18px 48px;
  font-size: 17px;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  padding: 14px 32px;
  border: 1.5px solid rgba(255,255,255,0.2);
  color: var(--c-text);
  font-weight: 500;
  font-size: 15px;
  border-radius: 50px;
  transition: var(--transition);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  border-color: var(--c-accent1);
  color: var(--c-accent1);
  transform: translateY(-2px);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  padding: 18px 40px;
  border: 1.5px solid rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.7);
  font-weight: 500;
  font-size: 16px;
  border-radius: 50px;
  transition: var(--transition);
}

.btn-ghost:hover {
  border-color: rgba(255,255,255,0.4);
  color: #fff;
}

/* ==============================
   네비게이션
============================== */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 0 40px;
  height: 64px;
  display: flex;
  align-items: center;
  transition: var(--transition);
}

#navbar.scrolled {
  background: rgba(14,15,17,0.92);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--c-border);
}

.nav-inner {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--c-grad-start), var(--c-grad-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--c-text-muted);
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--c-text); }

.nav-cta-btn {
  padding: 10px 24px;
  background: linear-gradient(135deg, var(--c-grad-start), var(--c-grad-end));
  color: #0e0f11 !important;
  border-radius: 50px;
  font-weight: 700 !important;
  font-size: 14px !important;
  transition: var(--transition) !important;
}

.nav-cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(123, 159, 255, 0.4);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: var(--transition);
}

/* 모바일 메뉴 */
.mobile-menu {
  position: fixed;
  top: 64px; left: 0; right: 0;
  background: rgba(14,15,17,0.97);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--c-border);
  z-index: 999;
  transform: translateY(-110%);
  transition: transform var(--transition);
}

.mobile-menu.open { transform: translateY(0); }

.mobile-menu ul {
  list-style: none;
  padding: 20px 0;
}

.mobile-menu ul li a {
  display: block;
  padding: 16px 40px;
  font-size: 16px;
  font-weight: 500;
  color: var(--c-text-muted);
  border-bottom: 1px solid var(--c-border);
  transition: color 0.2s;
}

.mobile-menu ul li a:hover { color: var(--c-accent1); }

/* ==============================
   히어로 섹션
============================== */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 120px 40px 80px;
}

.hero-img {
  position: absolute;
  top: 0; right: 0;
  width: 60%;
  height: 100%;
  object-fit: cover;
  object-position: left center;
}

.hero-bg-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    105deg,
    rgba(14,15,17,1) 38%,
    rgba(14,15,17,0.85) 55%,
    rgba(14,15,17,0.1) 75%
  );
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 580px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: rgba(123, 159, 255, 0.1);
  border: 1px solid rgba(123, 159, 255, 0.3);
  border-radius: 50px;
  font-size: 13px;
  font-weight: 500;
  color: var(--c-accent1);
  margin-bottom: 24px;
  animation: fadeInUp 0.7s ease both;
}

.hero-badge::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--c-accent1);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(1.4); }
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(36px, 6vw, 72px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  animation: fadeInUp 0.7s 0.1s ease both;
}

.hero-desc {
  font-size: clamp(15px, 2vw, 18px);
  color: var(--c-text-muted);
  line-height: 1.8;
  margin-bottom: 36px;
  animation: fadeInUp 0.7s 0.2s ease both;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 56px;
  animation: fadeInUp 0.7s 0.3s ease both;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 0;
  animation: fadeInUp 0.7s 0.4s ease both;
}

.stat {
  display: flex;
  flex-direction: column;
  padding: 0 28px;
}

.stat:first-child { padding-left: 0; }

.stat-num {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--c-text);
  line-height: 1;
}

.stat-label {
  font-size: 12px;
  color: var(--c-text-muted);
  margin-top: 4px;
}

.stat-divider {
  width: 1px;
  height: 36px;
  background: var(--c-border);
}

.hero-scroll-hint {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  animation: fadeInUp 1s 0.8s ease both;
}

.hero-scroll-hint span {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--c-text-muted);
  text-transform: uppercase;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--c-text-muted), transparent);
  animation: scrollAnim 1.5s ease-in-out infinite;
}

@keyframes scrollAnim {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ==============================
   특징 섹션
============================== */
#features {
  padding: 120px 40px;
  max-width: 1280px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-grad-start), var(--c-grad-end));
  opacity: 0;
  transition: opacity var(--transition);
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(123, 159, 255, 0.25);
  box-shadow: var(--shadow-card);
}

.feature-card:hover::before { opacity: 1; }

.feature-icon {
  font-size: 32px;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.3;
}

.feature-card p {
  font-size: 14px;
  color: var(--c-text-muted);
  line-height: 1.8;
}

/* ==============================
   상세 섹션
============================== */
#detail {
  padding: 120px 0;
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}

#detail .section-header {
  padding: 0 40px;
}

.detail-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  max-width: 1280px;
  margin: 0 auto 0;
  padding: 80px 40px;
  align-items: center;
  gap: 80px;
  border-bottom: 1px solid var(--c-border);
}

.detail-block:last-child { border-bottom: none; }

.detail-block--reverse {
  direction: rtl;
}

.detail-block--reverse > * { direction: ltr; }

.detail-block--full {
  grid-template-columns: 1fr 1fr;
}

.detail-block--dark {
  background: var(--c-bg);
  max-width: 100%;
  padding: 80px calc((100vw - 1200px) / 2);
}

.detail-img-wrap {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  background: #111;
  aspect-ratio: 4/3;
}

.detail-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.detail-img-wrap:hover img { transform: scale(1.03); }

.detail-img-wrap--hero,
.detail-img-wrap--wide {
  aspect-ratio: 16/9;
}

.detail-text { padding: 0 20px; }

.detail-num {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--c-accent2);
  display: block;
  margin-bottom: 16px;
}

.detail-num--light { color: rgba(123,159,255,0.6); }

.detail-text h3 {
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 20px;
}

.detail-text p {
  font-size: 15px;
  color: var(--c-text-muted);
  line-height: 1.9;
  margin-bottom: 24px;
}

.detail-text--light p { color: rgba(255,255,255,0.6); }

.detail-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.detail-list li {
  font-size: 14px;
  color: var(--c-text-muted);
  padding-left: 20px;
  position: relative;
}

.detail-list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--c-accent2);
}

/* ==============================
   스펙 섹션
============================== */
#specs {
  padding: 120px 40px;
  max-width: 900px;
  margin: 0 auto;
}

.specs-table-wrap {
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.specs-table {
  width: 100%;
  border-collapse: collapse;
}

.specs-table tr {
  border-bottom: 1px solid var(--c-border);
  transition: background 0.2s;
}

.specs-table tr:last-child { border-bottom: none; }
.specs-table tr:hover { background: var(--c-surface2); }

.specs-table th {
  padding: 20px 28px;
  text-align: left;
  font-size: 13px;
  font-weight: 600;
  color: var(--c-text-muted);
  width: 35%;
  letter-spacing: 0.02em;
  background: var(--c-surface);
}

.specs-table td {
  padding: 20px 28px;
  font-size: 14px;
  color: var(--c-text);
}

/* ==============================
   CTA 섹션
============================== */
#cta {
  padding: 160px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-inner {
  position: relative;
  z-index: 2;
  max-width: 680px;
  margin: 0 auto;
}

.cta-tag {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--c-accent2);
  text-transform: uppercase;
  margin-bottom: 16px;
}

.cta-title {
  font-family: var(--font-display);
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.cta-desc {
  font-size: 17px;
  color: var(--c-text-muted);
  margin-bottom: 48px;
}

.cta-price {
  display: inline-flex;
  align-items: center;
  gap: 20px;
  padding: 20px 40px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  margin-bottom: 40px;
}

.price-label {
  font-size: 13px;
  color: var(--c-text-muted);
  font-weight: 500;
}

.price-value {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--c-grad-start), var(--c-grad-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* 배경 원 */
.cta-bg-circles {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.circle {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.15;
}

.c1 {
  width: 600px; height: 600px;
  background: var(--c-grad-start);
  top: -200px; left: -200px;
}

.c2 {
  width: 400px; height: 400px;
  background: var(--c-grad-end);
  bottom: -100px; right: -100px;
}

.c3 {
  width: 300px; height: 300px;
  background: var(--c-accent1);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
}

/* ==============================
   푸터
============================== */
#footer {
  border-top: 1px solid var(--c-border);
  padding: 60px 40px 0;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--c-border);
}

.footer-brand .footer-logo {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--c-grad-start), var(--c-grad-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
  margin-bottom: 8px;
}

.footer-brand p {
  font-size: 13px;
  color: var(--c-text-muted);
}

.footer-links {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}

.footer-links a {
  font-size: 14px;
  color: var(--c-text-muted);
  transition: color 0.2s;
}

.footer-links a:hover { color: var(--c-accent1); }

.footer-bottom {
  max-width: 1280px;
  margin: 0 auto;
  padding: 24px 0;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: rgba(138,141,150,0.5);
}

/* ==============================
   애니메이션 키프레임
============================== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ==============================
   반응형
============================== */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }

  .detail-block {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .detail-block--reverse { direction: ltr; }

  .detail-block--dark {
    padding: 80px 40px;
  }
}

@media (max-width: 768px) {
  #navbar { padding: 0 20px; }

  .nav-links { display: none; }

  .hamburger { display: flex; }

  #hero { padding: 100px 24px 80px; }

  .hero-img {
    width: 100%;
    height: 100%;
    opacity: 0.25;
  }

  .hero-content { max-width: 100%; }

  .features-grid { grid-template-columns: 1fr; }

  #features { padding: 80px 24px; }

  #detail { padding: 80px 0; }

  #detail .section-header { padding: 0 24px; }

  .detail-block { padding: 60px 24px; gap: 32px; }

  #specs { padding: 80px 24px; }

  #cta { padding: 100px 24px; }

  #footer { padding: 48px 24px 0; }

  .footer-inner { flex-direction: column; gap: 32px; }

  .footer-links { gap: 20px; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }

  .hero-stats {
    flex-wrap: wrap;
    gap: 20px;
  }

  .stat-divider { display: none; }

  .stat { padding: 0; }

  .cta-buttons { flex-direction: column; align-items: center; }
}