html {
  scroll-snap-type: y mandatory;
}

body {
  background-color: #ffffff;
  color: #000000;
  -webkit-font-smoothing: antialiased;
  word-break: keep-all;
}

.snap-section {
  scroll-snap-align: start;
  min-height: 100vh;
}

/* 히어로 스포트라이트 빔 */
.hero-spotlight {
  position: absolute;
  top: -10%;
  left: 50%;
  transform: translateX(-50%) scale(0.95);
  width: 160%;
  height: 130%;
  background: radial-gradient(
    ellipse 50% 55% at 50% 5%,
    rgb(250, 204, 21) 0%,
    rgba(253, 224, 71, 0.22) 30%,
    rgba(254, 249, 195, 0.08) 58%,
    transparent 80%
  );
  pointer-events: none;
  z-index: 0;
  animation: spotlight-beam 5s ease-in-out infinite;
}

@keyframes spotlight-beam {
  0%,
  100% {
    opacity: 0.65;
    transform: translateX(-50%) scale(0.95);
  }
  50% {
    opacity: 1;
    transform: translateX(-50%) scale(1.08);
  }
}

/* 텍스트 강조 밑줄 */
.highlight-yellow {
  position: relative;
  display: inline-block;
  z-index: 1;
  padding-bottom: 0.05em;
  background-image: linear-gradient(transparent 60%, #facc15 0);
  background-size: 100% 0.32em;
  background-repeat: no-repeat;
  background-position: 0 85%;
}

/* 스크롤 페이드업 애니메이션 */
.fade-up {
  opacity: 0;
  transform: translateY(40px);
  transition:
    opacity 1.2s cubic-bezier(0.16, 1, 0.3, 1),
    transform 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}
.fade-up.in-view {
  opacity: 1;
  transform: translateY(0);
}
.delay-100 {
  transition-delay: 100ms;
}
.delay-200 {
  transition-delay: 200ms;
}

.soft-glow {
  box-shadow: 0 18px 55px rgba(0, 0, 0, 0.12);
}

.section-sep {
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    #f1f3f5 15%,
    #f1f3f5 85%,
    transparent 100%
  );
}

.btn-highlight {
  position: relative;
  overflow: hidden;
}
.btn-highlight::before {
  content: "";
  position: absolute;
  top: 0;
  left: 12%;
  right: 12%;
  height: 1px;
  background: rgba(255, 255, 255, 0.5);
}

.section-number {
  letter-spacing: -0.02em;
}
.section-title {
  letter-spacing: -0.02em;
  line-height: 1.25;
}

/* =====================
   기능 소개 텍스트 애니메이션
   ===================== */

/* 섹션 번호 (01/02/03) — 아래서 올라오며 등장 */
.anim-number {
  opacity: 0;
  transform: translateY(40px);
  transition:
    opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}
.anim-number.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* 제목 — 라인별 커튼 리빌 */
.anim-heading-wrap {
  display: block;
  overflow: hidden;
}
.anim-heading-line {
  display: block;
  transform: translateY(110%);
  transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}
.anim-heading-line.in-view {
  transform: translateY(0);
}
.anim-heading-line.delay-80 {
  transition-delay: 80ms;
}
.anim-heading-line.delay-160 {
  transition-delay: 160ms;
}

/* 설명 텍스트 — 제목 이후 등장 */
.anim-desc {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.3s,
    transform 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.3s;
}
.anim-desc.in-view {
  opacity: 1;
  transform: translateY(0);
}

.glass-nav {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.5),
    0 4px 24px rgba(0, 0, 0, 0.06),
    inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.glass-card {
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.5),
    inset 0 -1px 0 rgba(255, 255, 255, 0.1),
    inset 0 0 20px 10px rgba(255, 255, 255, 1);
  position: relative;
  overflow: hidden;
}

.glass-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.8),
    transparent
  );
}

.glass-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 100%;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.8),
    transparent,
    rgba(255, 255, 255, 0.3)
  );
}

@media (prefers-reduced-motion: reduce) {
  .fade-up {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .delay-100,
  .delay-200 {
    transition-delay: 0ms;
  }
}

/* =====================
   히어로 섹션 배경
   ===================== */
.hero-section {
  background: radial-gradient(
    ellipse 80% 60% at 70% 40%,
    #fef9c3 0%,
    #ffffff 70%
  );
}

/* =====================
   다크모드 토글 버튼
   ===================== */
#theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1.5px solid #e5e7eb;
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #000;
  font-size: 14px;
  flex-shrink: 0;
  line-height: 1;
  transition:
    border-color 0.2s,
    background 0.2s,
    color 0.2s;
}
#theme-toggle:hover {
  background: #f3f4f6;
}
html.dark #theme-toggle {
  border-color: #252a35;
  color: #edeef0;
}
html.dark #theme-toggle:hover {
  background: #1a1e27;
}

/* =====================
   다크모드 FOUC 방지
   ===================== */
html.no-dark-transition,
html.no-dark-transition * {
  transition: none !important;
}

/* =====================
   다크모드 전환 트랜지션
   ===================== */
body,
.glass-nav,
.hero-section,
section.snap-section,
footer,
#download-modal-card,
.border-borderLight,
.hero-spotlight {
  transition:
    background-color 0.3s ease,
    color 0.3s ease,
    border-color 0.3s ease,
    box-shadow 0.3s ease;
}

/* =====================
   다크 모드
   ===================== */
html.dark body {
  background-color: #0d0f12;
  color: #edeef0;
}

/* 히어로 섹션 배경 */
html.dark .hero-section {
  background: radial-gradient(
    ellipse 80% 60% at 70% 40%,
    rgba(234, 179, 8, 0.12) 0%,
    #0d0f12 70%
  );
}

/* 스포트라이트 — 다크모드에서 더 은은하게 */
html.dark .hero-spotlight {
  opacity: 0.45;
}

/* 네비게이션 */
html.dark .glass-nav {
  background: rgba(13, 15, 18, 0.82);
  border-bottom-color: rgba(255, 255, 255, 0.07);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.05),
    0 4px 24px rgba(0, 0, 0, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

/* 텍스트 */
html.dark .text-textMain {
  color: #edeef0;
}
html.dark .text-textMuted {
  color: #8892a4;
}
html.dark .text-black {
  color: #edeef0;
}

/* 배경 */
html.dark .bg-white {
  background-color: #0d0f12;
}
html.dark .bg-surface {
  background-color: #161a20;
}
html.dark .bg-textMain {
  background-color: #edeef0;
}
html.dark .bg-textMain.text-white {
  color: #0d0f12;
}

/* hover */
html.dark .hover\:bg-white:hover {
  background-color: #1a1e27;
}
html.dark .hover\:text-textMain:hover {
  color: #edeef0;
}

/* 보더 */
html.dark .border-borderLight {
  border-color: #252a35;
}

/* 섹션 */
html.dark section.snap-section {
  background-color: #0d0f12;
}
html.dark footer.snap-section {
  background-color: #0d0f12;
}

/* 이미지 그림자 강화 */
html.dark [data-parallax] {
  filter: drop-shadow(0 25px 60px rgba(0, 0, 0, 0.5));
}
html.dark .soft-glow {
  box-shadow: 0 18px 55px rgba(0, 0, 0, 0.5);
}



/* 모달 */
html.dark #download-modal-card {
  background-color: #161a20;
}
html.dark #download-modal-card h3 {
  color: #edeef0;
}
html.dark #download-modal-card p {
  color: #8892a4;
}
html.dark #download-modal-card span.font-bold {
  color: #edeef0;
}
html.dark #download-modal-close {
  border-color: #252a35;
  color: #8892a4;
}
html.dark #download-modal-close:hover {
  color: #edeef0;
}