/* ===== CSS 변수 ===== */
:root {
  --color-bg: #050505;
  --color-text: #FFFFFF;
  --color-text-secondary: #B5B5B5;
  --color-btn-bg: #111111;
  --color-btn-bg-hover: #1A1A1A;
  --color-btn-border: #333333;
  --color-card-bg: #0D0D0D;
  --color-card-border: #222222;
  --color-accent-gold: #C8A96A;
  --color-accent-silver: #CFCFCF;

  --font-family: 'Pretendard Variable', Pretendard, 'Noto Sans KR',
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  --content-max-width: 520px;
  --section-gap: 88px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-family);
  font-display: swap;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

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

/* ===== Buttons ===== */
.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 14px 24px;
  border-radius: 12px;
  background-color: var(--color-btn-bg);
  border: 1px solid var(--color-btn-border);
  color: var(--color-text);
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  transition: background-color var(--transition), border-color var(--transition);
}

.btn:hover {
  background-color: var(--color-btn-bg-hover);
}

.btn--cta {
  margin-top: 32px;
  padding-left: 32px;
  padding-right: 32px;
}

.btn--channel {
  width: 100%;
  min-height: 52px;
}

.btn--book {
  width: 100%;
  min-height: 52px;
  border-color: var(--color-accent-gold);
  color: var(--color-accent-gold);
}

.btn--book:hover {
  background-color: #17140d;
}

/* ===== Hero ===== */
.hero {
  padding: 96px 0 64px;
}

.hero__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.hero__brand {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.avatar {
  position: relative;
  width: 108px;
  height: 108px;
  border-radius: 50%;
  overflow: hidden;
  margin-top: 28px;
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  display: flex;
  align-items: center;
  justify-content: center;
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.avatar__fallback {
  display: none;
  position: absolute;
  inset: 0;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  font-weight: 700;
  color: var(--color-text-secondary);
}

.avatar.is-empty img {
  display: none;
}

.avatar.is-empty .avatar__fallback {
  display: flex;
}

.hero__intro {
  margin-top: 28px;
  color: var(--color-text-secondary);
  font-size: 15px;
}

/* ===== Sections (shared) ===== */
.section {
  padding: var(--section-gap) 0 0;
}

.section__title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: 16px;
  padding: 28px 24px;
}

/* ===== About ===== */
.about__card p {
  color: var(--color-text-secondary);
  font-size: 15px;
}

.about__card p + p {
  margin-top: 16px;
}

/* ===== Book ===== */
.card--book {
  text-align: center;
}

.book__cover {
  width: 140px;
  aspect-ratio: 3 / 4;
  margin: 0 auto;
  border-radius: 8px;
  overflow: hidden;
  background-color: #1A1A1A;
  border: 1px solid var(--color-card-border);
}

.book__cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.book__cover.is-empty img {
  display: none;
}

.book__title {
  margin-top: 24px;
  font-size: 22px;
  font-weight: 700;
  color: var(--color-accent-gold);
}

.book__divider {
  width: 40px;
  height: 1px;
  background-color: var(--color-accent-gold);
  opacity: 0.6;
  margin: 18px auto;
}

.book__desc {
  color: var(--color-text-secondary);
  font-size: 14.5px;
  padding: 0 4px;
}

.book__links {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 26px;
}

/* ===== Channels ===== */
.channels__list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* ===== Footer ===== */
.footer {
  padding: var(--section-gap) 0 56px;
  text-align: center;
}

.footer__statement {
  font-size: 19px;
  font-weight: 600;
  line-height: 1.5;
}

.footer__copyright {
  margin-top: 20px;
  font-size: 12px;
  color: var(--color-text-secondary);
}

/* ===== Responsive ===== */
@media (min-width: 560px) {
  .hero {
    padding-top: 120px;
  }

  .avatar {
    width: 120px;
    height: 120px;
  }
}