/* ── APP PAGE STYLES ── */

.app-hero {
  min-height: 52vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 140px 5% 80px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(160deg, #eef4ff 0%, #f7f9ff 40%, #e8f6ff 100%);
}
[data-theme="dark"] .app-hero {
  background: radial-gradient(ellipse 70% 55% at 20% 20%, rgba(0,80,180,0.22), transparent 60%),
              radial-gradient(ellipse 60% 50% at 80% 80%, rgba(0,120,212,0.14), transparent 60%),
              var(--bg);
}
.app-hero-grid {
  position: absolute; inset: 0;
  background-image: linear-gradient(var(--border) 1px, transparent 1px),
                    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 80%);
  pointer-events: none; opacity: 0.5;
}
.app-hero-content {
  position: relative; z-index: 1;
  max-width: 700px;
  display: flex; flex-direction: column; align-items: center;
}
.app-hero-icon {
  width: 88px; height: 88px;
  object-fit: contain;
  margin: 0 auto 28px;
  filter: drop-shadow(0 8px 24px rgba(0,0,0,0.12));
  transition: transform 0.3s;
}
.app-hero-icon:hover { transform: scale(1.08) rotate(-4deg); }
.app-breadcrumb {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; color: var(--muted); font-weight: 600;
  margin-bottom: 20px;
  text-decoration: none;
}
.app-breadcrumb:hover { color: var(--blue); }
.app-breadcrumb span { color: var(--blue); }
.app-hero h1 {
  font-size: clamp(30px, 5vw, 56px);
  font-weight: 900; letter-spacing: -2px;
  line-height: 1.08; margin-bottom: 16px;
  color: var(--text);
}
.app-hero h1 em {
  font-style: normal;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.app-hero-desc {
  font-size: clamp(15px, 1.8vw, 18px);
  color: var(--muted); line-height: 1.7;
  max-width: 560px; margin: 0 auto 36px;
}
.app-hero-cta {
  background: var(--blue); color: #fff;
  padding: 13px 28px; border-radius: var(--r-pill);
  font-size: 14px; font-weight: 700; border: none;
  cursor: pointer; text-decoration: none;
  box-shadow: 0 4px 20px rgba(0,120,212,0.35);
  transition: all 0.22s; display: inline-block;
}
.app-hero-cta:hover { background: var(--blue-dark); transform: translateY(-2px); }

/* ── TOPICS SECTION ── */
.topics-section {
  padding: 90px 5%;
  background: var(--bg3);
  transition: background 0.4s;
}
.topics-section .s-header { margin-bottom: 52px; }
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  max-width: 1100px;
  margin: 0 auto;
}
.topic-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--r-xl);
  padding: 28px 26px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.22s, box-shadow 0.22s, border-color 0.22s, background 0.4s;
  position: relative; overflow: hidden;
}
.topic-card::after {
  content: '';
  position: absolute; bottom: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--app-accent, var(--blue)), var(--cyan));
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.35s cubic-bezier(0.16,1,0.3,1);
}
.topic-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--border2); }
.topic-card:hover::after { transform: scaleX(1); }
.topic-icon {
  width: 48px; height: 48px; border-radius: 14px;
  background: var(--tag-bg);
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; margin-bottom: 16px;
  transition: transform 0.3s;
}
.topic-card:hover .topic-icon { transform: scale(1.12) rotate(-5deg); }
.topic-title { font-size: 15px; font-weight: 800; margin-bottom: 6px; color: var(--text); }
.topic-desc { font-size: 13px; color: var(--muted); line-height: 1.7; }

/* ── BACK BANNER ── */
.back-banner {
  background: linear-gradient(160deg, #004fa3 0%, #0078d4 55%, #00a4d4 100%);
  padding: 60px 5%; text-align: center; position: relative; overflow: hidden;
}
[data-theme="dark"] .back-banner {
  background: linear-gradient(160deg, #001a3d 0%, #003a7a 55%, #005a9e 100%);
}
.back-banner-dots {
  position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255,255,255,0.1) 1px, transparent 1px);
  background-size: 32px 32px; pointer-events: none;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black, transparent);
}
.back-banner h2 {
  font-size: clamp(22px, 3vw, 36px); font-weight: 900;
  color: #fff; margin-bottom: 10px; letter-spacing: -1px;
}
.back-banner p { color: rgba(255,255,255,0.8); font-size: 16px; margin-bottom: 28px; }
.back-banner-btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn-white {
  background: #fff; color: var(--blue);
  padding: 12px 24px; border-radius: var(--r-pill);
  font-size: 14px; font-weight: 800; border: none; cursor: pointer;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
  text-decoration: none; display: inline-block;
  transition: all 0.22s;
}
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(0,0,0,0.2); }
.btn-ghost {
  background: rgba(255,255,255,0.15); color: #fff;
  padding: 12px 24px; border-radius: var(--r-pill);
  font-size: 14px; font-weight: 700;
  border: 1px solid rgba(255,255,255,0.3);
  text-decoration: none; display: inline-block;
  transition: all 0.22s; backdrop-filter: blur(10px);
}
.btn-ghost:hover { background: rgba(255,255,255,0.25); }

/* ── AGENDA ── */
.agenda-section {
  padding: 90px 5%;
  background: var(--bg2);
  transition: background 0.4s;
}
.agenda-section .s-header { max-width: 800px; margin: 0 auto 52px; }
.agenda-timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}
.agenda-timeline::before {
  content: '';
  position: absolute;
  left: 100px; top: 8px; bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--blue), var(--cyan));
  opacity: 0.18;
  border-radius: 2px;
}
.agenda-item {
  display: grid;
  grid-template-columns: 84px 32px 1fr;
  gap: 0 20px;
  align-items: flex-start;
  margin-bottom: 28px;
  position: relative;
}
.agenda-time {
  font-size: 12px; font-weight: 800;
  color: var(--blue); text-align: right;
  padding-top: 3px; letter-spacing: 0.2px;
  white-space: nowrap;
}
.agenda-dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--blue);
  border: 2px solid var(--bg2);
  box-shadow: 0 0 0 2px var(--blue);
  margin: 3px auto 0;
  position: relative; z-index: 1; flex-shrink: 0;
  transition: background 0.4s, border-color 0.4s, box-shadow 0.4s;
}
.agenda-content { padding-bottom: 4px; }
.agenda-title {
  font-size: 14px; font-weight: 700;
  color: var(--text); margin-bottom: 3px;
}
.agenda-desc { font-size: 13px; color: var(--muted); line-height: 1.6; }
.agenda-item.is-break .agenda-dot {
  background: var(--subtle);
  box-shadow: 0 0 0 2px var(--subtle);
}
.agenda-item.is-break .agenda-time,
.agenda-item.is-break .agenda-title { color: var(--muted); }
.agenda-item.is-break .agenda-title { font-weight: 500; font-style: italic; }

/* ── ABOUT THIS APP ── */
.app-about {
  padding: 80px 5% 20px;
  background: var(--bg);
  transition: background 0.4s;
}
.app-about-inner {
  max-width: 820px;
  margin: 0 auto;
}
.app-about h2 {
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 900;
  letter-spacing: -1px;
  color: var(--text);
  margin-bottom: 18px;
  line-height: 1.2;
}
.app-about p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text2);
  margin-bottom: 14px;
}
.app-about p:last-child { margin-bottom: 0; }
.app-about p strong { color: var(--text); font-weight: 700; }

/* ── SESSIONS (bullet-point format) ── */
.sessions-section {
  padding: 90px 5%;
  background: var(--bg2);
  transition: background 0.4s;
}
.sessions-header {
  max-width: 820px;
  margin: 0 auto 52px;
}
.sessions-grid {
  max-width: 820px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.session-card-wrap {
  max-width: 820px;
  margin: 0 auto;
}
.session-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--r-xl);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.22s, box-shadow 0.22s, border-color 0.22s, background 0.4s;
  position: relative; overflow: hidden;
}
.session-card::after {
  content: '';
  position: absolute; bottom: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.35s cubic-bezier(0.16,1,0.3,1);
}
.session-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--border2); }
.session-card:hover::after { transform: scaleX(1); }
.session-title {
  font-size: 15px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.session-bullets {
  list-style: none;
  padding: 0; margin: 0;
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.session-bullets li {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
  padding-left: 16px;
  position: relative;
}
.session-bullets li::before {
  content: '';
  position: absolute;
  left: 0; top: 6px;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--blue);
  flex-shrink: 0;
}

@media (max-width: 720px) {
  .topics-grid { grid-template-columns: 1fr; }
  .app-hero { padding: 120px 5% 60px; }
  .agenda-timeline::before { left: 76px; }
  .agenda-item { grid-template-columns: 60px 28px 1fr; gap: 0 12px; }
  .agenda-time { font-size: 11px; }
  .sessions-grid { grid-template-columns: 1fr; }
  .sessions-header { flex-direction: column; }
}