/* ── Theme Variables ──────────────────────────────────── */

:root {
  --bg: #fff;
  --text: #111;
  --text-secondary: #444;
  --text-muted: #555;
  --text-faint: #888;
  --text-ghost: #999;
  --text-dim: #bbb;
  --nav-bg: rgba(255, 255, 255, 0.92);
  --nav-border: rgba(0, 0, 0, 0.06);
  --border: rgba(0, 0, 0, 0.1);
  --rule: #ddd;
  --btn-bg: #111;
  --btn-text: #fff;
  --ascii-color: #000;
  --ascii-expert: #333;
  --accent: #FF991C;
  --nav-link: #555;
  --nav-link-hover: #000;
  --cta-bg: #111;
  --cta-text: #fff;
}

[data-theme="dark"] {
  --bg: #0e0e0e;
  --text: #e0e0e0;
  --text-secondary: #bbb;
  --text-muted: #aaa;
  --text-faint: #777;
  --text-ghost: #666;
  --text-dim: #555;
  --nav-bg: rgba(14, 14, 14, 0.92);
  --nav-border: rgba(255, 255, 255, 0.08);
  --border: rgba(255, 255, 255, 0.12);
  --rule: #2a2a2a;
  --btn-bg: #e0e0e0;
  --btn-text: #0e0e0e;
  --ascii-color: #ccc;
  --ascii-expert: #aaa;
  --accent: #FF991C;
  --nav-link: #999;
  --nav-link-hover: #fff;
  --cta-bg: #e0e0e0;
  --cta-text: #0e0e0e;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e0e0e;
    --text: #e0e0e0;
    --text-secondary: #bbb;
    --text-muted: #aaa;
    --text-faint: #777;
    --text-ghost: #666;
    --text-dim: #555;
    --nav-bg: rgba(14, 14, 14, 0.92);
    --nav-border: rgba(255, 255, 255, 0.08);
    --border: rgba(255, 255, 255, 0.12);
    --rule: #2a2a2a;
    --btn-bg: #e0e0e0;
    --btn-text: #0e0e0e;
    --ascii-color: #ccc;
    --ascii-expert: #aaa;
    --accent: #FF991C;
    --nav-link: #999;
    --nav-link-hover: #fff;
    --cta-bg: #e0e0e0;
    --cta-text: #0e0e0e;
  }
}

/* ── Reset & Base ─────────────────────────────────────── */

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  background: var(--bg);
}

body {
  font-family: "Fira Code", monospace;
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--bg);
  background-position: 0 0, 100% 0;
  background-repeat: no-repeat, no-repeat;
  background-size: 22px 100%, 22px 100%;
  background-image:
    linear-gradient(
      to right,
      var(--rule) 0, var(--rule) 1px, transparent 1px,
      transparent 20px, var(--rule) 20px, var(--rule) 21px, transparent 21px
    ),
    linear-gradient(
      to right,
      var(--rule) 0, var(--rule) 1px, transparent 1px,
      transparent 20px, var(--rule) 20px, var(--rule) 21px, transparent 21px
    );
}

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

.link--accent {
  color: var(--accent);
}

ul {
  list-style: none;
}

/* ── Nav ─────────────────────────────────────────────── */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--nav-border);
}

.nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 32px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 32px;
}

.nav-link {
  font-size: 14px;
  letter-spacing: 0.01em;
  color: var(--nav-link);
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--nav-link-hover);
}

.nav-link--cta {
  display: inline-block;
  padding: 4px 12px;
  background: var(--cta-bg);
  color: var(--cta-text);
  font-weight: 400;
  font-size: 14px;
}

.nav-link--cta:hover {
  color: var(--cta-text);
}

/* ── Hero ────────────────────────────────────────────── */

.hero {
  max-width: 1080px;
  margin: 0 auto;
  padding: 80px 32px 64px;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  align-items: center;
  gap: 16px 48px;
}

.hero-text {
  grid-column: 1;
  grid-row: 1;
  min-width: 0;
}

.hero-cta {
  grid-column: 1;
  grid-row: 2;
  justify-self: start;
  margin-top: 8px;
}

.hero-title {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: clamp(17px, 2.2vw, 22px);
  font-weight: 400;
  color: var(--text-secondary);
  line-height: 1.5;
}

.hero-ascii-wrap {
  grid-column: 2;
  grid-row: 1 / 3;
  display: flex;
  justify-content: center;
  align-self: center;
}

.hero-ascii {
  font-family: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", "Courier New", monospace;
  font-size: 5px;
  line-height: 6px;
  letter-spacing: 0.5px;
  color: var(--ascii-color);
  user-select: none;
  white-space: pre;
  text-align: left;
}

/* ── Buttons ─────────────────────────────────────────── */

.btn {
  display: inline-block;
  padding: 8px 20px;
  border: none;
  border-radius: 0;
  background: var(--btn-bg);
  color: var(--btn-text);
  font-size: 19px;
  font-weight: 400;
  letter-spacing: 0.01em;
  cursor: pointer;
}

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

.btn--large {
  padding: 10px 24px;
  font-size: 21px;
  margin-top: 24px;
}

/* ── Sections ────────────────────────────────────────── */

.section {
  position: relative;
  overflow: visible;
}

/* Full-width horizontal separator at top of each section */
.section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  height: 1px;
  background: var(--rule);
  pointer-events: none;
}

.section-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 64px 32px;
  display: grid;
  grid-template-columns: 209px 1fr;
  gap: 48px;
  align-items: start;
}

.section-heading {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
  position: sticky;
  top: 80px;
  padding-bottom: 12px;
  border-bottom: 3px solid var(--accent);
  margin-right: 40px;
}

.section-body p {
  margin-bottom: 16px;
}

.section-body .label {
  font-weight: 600;
  margin-top: 24px;
}

.section-body ul {
  margin-bottom: 16px;
}

.section-body li {
  margin-bottom: 8px;
}

/* ── Schedule ────────────────────────────────────────── */

.schedule {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.schedule-month {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.schedule-label {
  font-weight: 700;
  font-size: 22px;
  color: var(--text);
  letter-spacing: -0.02em;
  padding-bottom: 8px;
  border-bottom: 3px solid var(--accent);
  align-self: flex-start;
}

.schedule-events {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.schedule-event {
  padding-bottom: 24px;
  border-bottom: 1px solid var(--nav-border);
}

.schedule-event:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.schedule-event-title {
  font-weight: 600;
  margin-bottom: 4px;
}

.schedule-event-speaker {
  font-size: 14px;
  color: var(--text-faint);
  margin-bottom: 8px;
}

.schedule-event-desc {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.55;
}

.schedule-tbd {
  color: var(--text-dim);
  font-size: 15px;
}

/* ── Experts ─────────────────────────────────────────── */

.experts-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.expert-card {
  border: 1px solid var(--border);
  padding: 24px 16px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.expert-photo {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  filter: grayscale(100%);
  margin-bottom: 16px;
}

.expert-name {
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.01em;
  margin-bottom: 2px;
}

.expert-company {
  font-size: 13px;
  color: var(--text-faint);
}

.experts-note {
  margin-top: 24px;
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.55;
}

/* ── Join section ────────────────────────────────────── */

.section--join .section-body {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.price-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  width: 100%;
  margin-top: 8px;
}

.price-card {
  border: 1px solid var(--border);
  padding: 24px;
  text-align: center;
}

.price-card-amount {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.price-card-period {
  font-size: 18px;
  font-weight: 400;
  color: var(--text-muted);
}

.price-card-detail {
  margin-top: 8px;
  font-size: 14px;
  color: var(--text-faint);
}

.disclaimer {
  margin-top: 12px;
  font-size: 13px;
  color: var(--text-faint);
  line-height: 1.5;
}

/* ── FAQ ────────────────────────────────────────────── */

.faq {
  display: flex;
  flex-direction: column;
}

.faq-item {
  border-top: 1px solid var(--border);
  padding: 16px 0;
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-summary {
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  list-style: none;
  letter-spacing: -0.01em;
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-summary::after {
  content: "▾";
  font-size: 1.2em;
  margin-left: 16px;
  transition: transform 0.2s;
  flex-shrink: 0;
}

.faq-item[open] > .faq-summary::after {
  transform: rotate(180deg);
}

.faq-body {
  margin-top: 12px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ── Theme Toggle ────────────────────────────────────── */

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-family: "Fira Code", monospace;
  font-size: 19px;
  line-height: 1;
  padding: 4px 8px;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  margin-right: -24px;
}

.theme-toggle:hover {
  color: var(--text);
  border-color: var(--text-muted);
}

/* ── Responsive ──────────────────────────────────────── */

@media (max-width: 768px) {
  body {
    background-position: 10px 0, calc(100% - 10px) 0;
    background-size: 1px 100%, 1px 100%;
    background-image:
      linear-gradient(to right, var(--rule) 0, var(--rule) 1px, transparent 1px),
      linear-gradient(to right, var(--rule) 0, var(--rule) 1px, transparent 1px);
  }

  .nav-inner {
    padding: 8px 20px;
    height: auto;
    gap: 12px 20px;
    flex-wrap: wrap;
    justify-content: center;
  }

  .hero {
    padding: 48px 20px 40px;
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
  }

  .hero-text {
    grid-column: 1;
    grid-row: 1;
    order: 1;
  }

  .hero-ascii-wrap {
    grid-column: 1;
    grid-row: 2;
    justify-content: flex-start;
    order: 2;
  }

  .hero-cta {
    grid-column: 1;
    grid-row: 3;
    order: 3;
    font-size: 17px;
    padding: 8px 20px;
  }

  .btn--large {
    font-size: 17px;
    padding: 8px 20px;
  }

  .hero-ascii {
    font-size: 4px;
    line-height: 4.8px;
    letter-spacing: 0.4px;
  }

  .section::before {
    width: 100%;
    left: 0;
    transform: none;
  }

  .section-inner {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 40px 20px;
  }

  .section-heading {
    position: static;
  }

  .schedule-month {
    gap: 12px;
  }

  .experts-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
}

@media (max-width: 480px) {
  .hero-ascii {
    font-size: 2.5px;
    line-height: 3px;
    letter-spacing: 0.25px;
  }
}