/* =========================================================
   2026 AI × ESG × UAV Symposium - Global Stylesheet
   主色：深海藍 #0A2540 / 科技綠 #00E5A0 / 港都金 #F5B843
   ========================================================= */

:root {
  --deep-ocean: #0A2540;
  --deep-ocean-2: #0F3460;
  --tech-green: #00E5A0;
  --tech-green-soft: #7AF5C7;
  --harbor-gold: #F5B843;
  --mist: #F4F7FA;
  --fog: #E6EDF3;
  --ink: #1A1F2E;
  --ink-soft: #4A5568;
  --muted: #8A94A6;
  --white: #FFFFFF;
  --danger: #E53E3E;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --shadow-sm: 0 2px 8px rgba(10,37,64,0.06);
  --shadow-md: 0 8px 24px rgba(10,37,64,0.08);
  --shadow-lg: 0 16px 48px rgba(10,37,64,0.12);

  --font-sans: 'Noto Sans TC', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Inter', 'Noto Sans TC', sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; transition: all .2s ease; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

/* ---------- Navbar ---------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(10, 37, 64, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.nav-wrap {
  max-width: 1280px;
  margin: 0 auto;
  padding: 18px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--white);
  font-weight: 700;
}
.nav-brand-mark {
  width: 38px; height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--tech-green), var(--harbor-gold));
  display: grid; place-items: center;
  color: var(--deep-ocean);
  font-weight: 900;
  font-size: 18px;
}
.nav-brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.nav-brand-text .ja { font-size: 15px; letter-spacing: 1px; }
.nav-brand-text .en { font-size: 11px; color: var(--tech-green); letter-spacing: 1.5px; }

.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a {
  color: rgba(255,255,255,0.82);
  font-size: 15px;
  font-weight: 500;
  position: relative;
  padding: 6px 0;
}
.nav-links a:hover,
.nav-links a.active { color: var(--tech-green); }
.nav-links a.active::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -4px;
  height: 2px;
  background: var(--tech-green);
  border-radius: 2px;
}
.nav-cta {
  background: var(--tech-green);
  color: var(--deep-ocean) !important;
  padding: 10px 22px !important;
  border-radius: 999px;
  font-weight: 700 !important;
}
.nav-cta:hover {
  background: var(--tech-green-soft);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(0,229,160,0.3);
}
.nav-toggle { display: none; background: none; border: 0; color: white; font-size: 24px; cursor: pointer; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  border: 0;
  cursor: pointer;
  transition: all .25s ease;
}
.btn-primary {
  background: var(--tech-green);
  color: var(--deep-ocean);
}
.btn-primary:hover {
  background: var(--tech-green-soft);
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(0,229,160,0.35);
}
.btn-ghost {
  background: transparent;
  color: var(--white);
  border: 1.5px solid rgba(255,255,255,0.3);
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.08);
  border-color: var(--tech-green);
  color: var(--tech-green);
}
.btn-dark {
  background: var(--deep-ocean);
  color: var(--white);
}
.btn-dark:hover {
  background: var(--deep-ocean-2);
}
.btn-block { width: 100%; justify-content: center; }

/* ---------- Containers ---------- */
.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 32px;
}
.section { padding: 96px 0; }
.section-sm { padding: 64px 0; }

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px;
}
.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--tech-green);
  letter-spacing: 3px;
  background: rgba(0,229,160,0.08);
  padding: 6px 16px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.section-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--deep-ocean);
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}
.section-sub {
  font-size: 17px;
  color: var(--ink-soft);
  line-height: 1.7;
}

/* ---------- Hero (index.html) ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  padding: 160px 32px 120px;
  background:
    radial-gradient(ellipse at top right, rgba(0,229,160,0.18) 0%, transparent 50%),
    radial-gradient(ellipse at bottom left, rgba(245,184,67,0.12) 0%, transparent 45%),
    linear-gradient(135deg, #061828 0%, var(--deep-ocean) 50%, var(--deep-ocean-2) 100%);
  color: var(--white);
  overflow: hidden;
  display: flex;
  align-items: center;
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(0,229,160,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,229,160,0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  pointer-events: none;
}
.hero-content {
  position: relative;
  max-width: 1240px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 64px;
  align-items: center;
  width: 100%;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  letter-spacing: 3px;
  color: var(--tech-green);
  margin-bottom: 24px;
  font-weight: 600;
}
.hero-eyebrow::before {
  content: '';
  width: 32px; height: 1px;
  background: var(--tech-green);
}
.hero h1 {
  font-size: clamp(36px, 5.5vw, 64px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
}
.hero h1 .accent {
  background: linear-gradient(135deg, var(--tech-green), var(--harbor-gold));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-tagline {
  font-size: 18px;
  color: rgba(255,255,255,0.72);
  margin-bottom: 40px;
  max-width: 520px;
  line-height: 1.7;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  margin-bottom: 40px;
}
.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 12px;
  color: rgba(255,255,255,0.85);
}
.hero-meta-item i {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 10px;
  background: rgba(0,229,160,0.12);
  color: var(--tech-green);
}
.hero-meta-item strong { display: block; font-size: 15px; }
.hero-meta-item span { font-size: 13px; color: rgba(255,255,255,0.55); }

.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }

/* Hero Visual (right side) */
.hero-visual {
  position: relative;
  aspect-ratio: 1/1;
  display: grid;
  place-items: center;
}
.hero-orb {
  width: 100%;
  aspect-ratio: 1/1;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(0,229,160,0.4), transparent 60%);
  position: absolute;
  inset: 0;
  animation: float 6s ease-in-out infinite;
}
.hero-ring {
  position: absolute;
  border: 1px solid rgba(0,229,160,0.2);
  border-radius: 50%;
  animation: rotate 40s linear infinite;
}
.hero-ring.r1 { inset: 10%; }
.hero-ring.r2 { inset: 22%; border-color: rgba(245,184,67,0.2); animation-direction: reverse; animation-duration: 30s; }
.hero-ring.r3 { inset: 35%; border-color: rgba(0,229,160,0.3); animation-duration: 20s; }

.hero-stat-card {
  position: absolute;
  background: rgba(255,255,255,0.06);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 16px;
  padding: 16px 22px;
  min-width: 140px;
}
.hero-stat-card .num {
  font-size: 28px;
  font-weight: 800;
  color: var(--tech-green);
  letter-spacing: -1px;
}
.hero-stat-card .lbl {
  font-size: 12px;
  color: rgba(255,255,255,0.7);
  letter-spacing: 1px;
}
.hero-stat-card.s1 { top: 10%; right: -10%; }
.hero-stat-card.s2 { bottom: 18%; left: -8%; }
.hero-stat-card.s3 { bottom: 0; right: 10%; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}
@keyframes rotate {
  from { transform: rotate(0); }
  to { transform: rotate(360deg); }
}

/* Countdown */
.countdown-bar {
  position: relative;
  z-index: 2;
  background: rgba(255,255,255,0.04);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 20px;
  padding: 24px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1240px;
  margin: -60px auto 0;
  color: white;
  flex-wrap: wrap;
  gap: 20px;
}
.countdown-label strong {
  display: block;
  font-size: 18px;
  margin-bottom: 4px;
}
.countdown-label span {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
}
.countdown-timer { display: flex; gap: 18px; }
.countdown-unit { text-align: center; min-width: 64px; }
.countdown-unit .n {
  font-size: 32px;
  font-weight: 800;
  color: var(--tech-green);
  font-variant-numeric: tabular-nums;
}
.countdown-unit .u {
  font-size: 11px;
  letter-spacing: 2px;
  color: rgba(255,255,255,0.5);
}

/* ---------- Topics (議題亮點) ---------- */
.topics-section { background: var(--mist); }
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.topic-card {
  background: white;
  border-radius: var(--radius-md);
  padding: 28px 26px;
  box-shadow: var(--shadow-sm);
  transition: all .3s ease;
  position: relative;
  overflow: hidden;
  border: 1px solid transparent;
}
.topic-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--tech-green);
}
.topic-num {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--tech-green);
  letter-spacing: 2px;
  margin-bottom: 12px;
}
.topic-card h3 {
  font-size: 18px;
  line-height: 1.5;
  color: var(--deep-ocean);
  margin-bottom: 12px;
  font-weight: 700;
}
.topic-tag {
  display: inline-block;
  font-size: 12px;
  padding: 4px 10px;
  background: rgba(10,37,64,0.06);
  color: var(--ink-soft);
  border-radius: 6px;
  margin-right: 6px;
}
.topic-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--tech-green), var(--harbor-gold));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s ease;
}
.topic-card:hover::before { transform: scaleX(1); }

/* ---------- Highlights (三大主軸) ---------- */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.pillar-card {
  padding: 40px 32px;
  border-radius: var(--radius-lg);
  color: white;
  position: relative;
  overflow: hidden;
  min-height: 320px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}
.pillar-ai { background: linear-gradient(135deg, #0A2540 0%, #1e3a5f 100%); }
.pillar-esg { background: linear-gradient(135deg, #064E3B 0%, #00E5A0 100%); }
.pillar-uav { background: linear-gradient(135deg, #7C2D12 0%, #F5B843 100%); }
.pillar-icon {
  font-size: 56px;
  color: rgba(255,255,255,0.25);
  margin-bottom: 20px;
  position: absolute;
  top: 32px; right: 32px;
}
.pillar-card h3 {
  font-size: 26px;
  margin-bottom: 12px;
  font-weight: 800;
}
.pillar-card p {
  font-size: 15px;
  color: rgba(255,255,255,0.85);
  line-height: 1.7;
}

/* ---------- Speakers preview ---------- */
.speakers-section { background: var(--deep-ocean); color: white; }
.speakers-section .section-title { color: white; }
.speakers-section .section-sub { color: rgba(255,255,255,0.7); }
.speakers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}
.speaker-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  transition: all .3s ease;
}
.speaker-card:hover {
  background: rgba(0,229,160,0.08);
  border-color: var(--tech-green);
  transform: translateY(-4px);
}
.speaker-avatar {
  width: 96px; height: 96px;
  border-radius: 50%;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--tech-green), var(--harbor-gold));
  display: grid; place-items: center;
  font-size: 36px;
  font-weight: 800;
  color: var(--deep-ocean);
}
.speaker-card h4 { font-size: 18px; margin-bottom: 4px; }
.speaker-title { color: var(--tech-green); font-size: 13px; margin-bottom: 8px; }
.speaker-org { color: rgba(255,255,255,0.6); font-size: 13px; }
.speaker-sector-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 11px;
  margin-top: 10px;
  font-weight: 600;
}
.sector-government { background: rgba(245,184,67,0.2); color: var(--harbor-gold); }
.sector-industry { background: rgba(0,229,160,0.2); color: var(--tech-green); }
.sector-academia { background: rgba(99,179,237,0.2); color: #63B3ED; }
.sector-research { background: rgba(237,137,254,0.2); color: #ED89FE; }

/* ---------- Agenda Timeline ---------- */
.agenda-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.agenda-tab {
  padding: 14px 32px;
  background: white;
  border: 2px solid var(--fog);
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-soft);
  cursor: pointer;
  transition: all .2s ease;
}
.agenda-tab.active,
.agenda-tab:hover {
  background: var(--deep-ocean);
  color: white;
  border-color: var(--deep-ocean);
}
.agenda-timeline { max-width: 960px; margin: 0 auto; }
.agenda-item {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 32px;
  padding: 24px 0;
  border-bottom: 1px solid var(--fog);
  align-items: flex-start;
}
.agenda-time {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--tech-green);
  font-size: 15px;
  white-space: nowrap;
}
.agenda-time .duration {
  display: block;
  font-size: 12px;
  color: var(--muted);
  font-weight: 400;
  margin-top: 4px;
}
.agenda-content h4 {
  font-size: 18px;
  color: var(--deep-ocean);
  margin-bottom: 8px;
  font-weight: 700;
}
.agenda-content p { color: var(--ink-soft); font-size: 14px; }
.agenda-type {
  display: inline-block;
  padding: 3px 10px;
  font-size: 11px;
  font-weight: 600;
  border-radius: 6px;
  margin-bottom: 8px;
  letter-spacing: 1px;
}
.type-keynote { background: rgba(245,184,67,0.15); color: #B88430; }
.type-panel { background: rgba(0,229,160,0.15); color: #008A5C; }
.type-break { background: var(--fog); color: var(--muted); }
.type-ceremony { background: rgba(229,62,62,0.1); color: var(--danger); }
.type-networking { background: rgba(99,179,237,0.15); color: #3182CE; }

.agenda-day.hidden { display: none; }

/* ---------- Exhibition Zones ---------- */
.exh-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
.exh-card {
  background: white;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all .3s ease;
  border: 1px solid var(--fog);
}
.exh-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.exh-cover {
  aspect-ratio: 16/10;
  background: linear-gradient(135deg, var(--deep-ocean), var(--tech-green));
  display: grid;
  place-items: center;
  color: white;
  font-size: 64px;
  position: relative;
  overflow: hidden;
}
.exh-cover::after {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(circle at 30% 20%, rgba(255,255,255,0.2), transparent 50%);
}
.exh-letter {
  position: absolute;
  top: 16px; left: 20px;
  font-size: 14px;
  font-weight: 800;
  color: white;
  background: rgba(0,0,0,0.3);
  padding: 4px 10px;
  border-radius: 6px;
  backdrop-filter: blur(8px);
}
.exh-body { padding: 24px; }
.exh-body h3 {
  font-size: 19px;
  color: var(--deep-ocean);
  margin-bottom: 10px;
  font-weight: 700;
}
.exh-body p { color: var(--ink-soft); font-size: 14px; line-height: 1.7; margin-bottom: 16px; }
.exh-highlight {
  background: rgba(0,229,160,0.08);
  border-left: 3px solid var(--tech-green);
  padding: 10px 14px;
  font-size: 13px;
  color: var(--deep-ocean);
  border-radius: 6px;
}

/* Floor map placeholder */
.floor-map {
  background: white;
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-top: 48px;
  box-shadow: var(--shadow-md);
}
.floor-map-box {
  aspect-ratio: 16/7;
  background:
    linear-gradient(90deg, var(--fog) 1px, transparent 1px) 0 0 / 40px 40px,
    linear-gradient(0deg, var(--fog) 1px, transparent 1px) 0 0 / 40px 40px,
    linear-gradient(135deg, #E6F7F1, #F5F9FF);
  border: 2px dashed var(--tech-green);
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
}
.floor-zone {
  position: absolute;
  background: white;
  border: 2px solid var(--deep-ocean);
  border-radius: 8px;
  padding: 10px;
  font-size: 12px;
  font-weight: 700;
  color: var(--deep-ocean);
  text-align: center;
  box-shadow: var(--shadow-sm);
}

/* ---------- Registration Form ---------- */
.register-section {
  background: linear-gradient(180deg, var(--mist) 0%, white 100%);
  min-height: 80vh;
}
.register-wrap {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 48px;
  align-items: flex-start;
}
.ticket-panel { position: sticky; top: 100px; }
.ticket-card {
  background: white;
  border-radius: var(--radius-md);
  padding: 22px;
  margin-bottom: 14px;
  border: 2px solid var(--fog);
  cursor: pointer;
  transition: all .2s ease;
}
.ticket-card:hover {
  border-color: var(--tech-green);
}
.ticket-card.selected {
  border-color: var(--tech-green);
  background: rgba(0,229,160,0.04);
  box-shadow: 0 6px 20px rgba(0,229,160,0.15);
}
.ticket-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 10px;
}
.ticket-head h4 { font-size: 17px; color: var(--deep-ocean); }
.ticket-price {
  font-size: 22px;
  font-weight: 800;
  color: var(--tech-green);
}
.ticket-price small { font-size: 13px; color: var(--muted); font-weight: 500; }
.ticket-desc { color: var(--ink-soft); font-size: 13px; margin-bottom: 12px; }
.ticket-card ul { padding-left: 4px; }
.ticket-card li {
  font-size: 13px;
  color: var(--ink-soft);
  padding: 4px 0 4px 22px;
  position: relative;
}
.ticket-card li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--tech-green);
  font-weight: 800;
}

.form-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
}
.form-card h2 {
  font-size: 24px;
  color: var(--deep-ocean);
  margin-bottom: 8px;
}
.form-card > p { color: var(--ink-soft); margin-bottom: 32px; }

.form-group { margin-bottom: 22px; }
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.form-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--deep-ocean);
  margin-bottom: 8px;
}
.form-label .req { color: var(--danger); margin-left: 4px; }
.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--fog);
  border-radius: 10px;
  font-size: 15px;
  font-family: inherit;
  color: var(--ink);
  transition: border-color .2s ease, box-shadow .2s ease;
  background: white;
}
.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--tech-green);
  box-shadow: 0 0 0 4px rgba(0,229,160,0.1);
}
.form-textarea { resize: vertical; min-height: 100px; }
.form-help { font-size: 12px; color: var(--muted); margin-top: 6px; }

.chip-group { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  background: var(--mist);
  border: 1.5px solid transparent;
  border-radius: 999px;
  font-size: 13px;
  color: var(--ink-soft);
  cursor: pointer;
  transition: all .2s ease;
  user-select: none;
}
.chip.active {
  background: rgba(0,229,160,0.1);
  border-color: var(--tech-green);
  color: var(--deep-ocean);
  font-weight: 600;
}
.chip input { display: none; }

.check-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px;
  background: var(--mist);
  border-radius: 10px;
  margin-bottom: 10px;
  cursor: pointer;
}
.check-row input { margin-top: 3px; accent-color: var(--tech-green); }
.check-row strong { color: var(--deep-ocean); font-size: 15px; }
.check-row span { display: block; color: var(--ink-soft); font-size: 13px; margin-top: 2px; }

/* ---------- Sponsors ---------- */
.sponsor-tier {
  margin-bottom: 56px;
}
.sponsor-tier-head {
  text-align: center;
  margin-bottom: 28px;
}
.sponsor-tier-head h3 {
  font-size: 22px;
  color: var(--deep-ocean);
  margin-bottom: 6px;
}
.sponsor-tier-head .badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 10px;
}
.badge-diamond { background: linear-gradient(135deg, #B8E0FF, #6A9BD1); color: white; }
.badge-gold { background: linear-gradient(135deg, #F5B843, #C48512); color: white; }
.badge-silver { background: linear-gradient(135deg, #D5DBE1, #8A94A6); color: white; }
.badge-partner { background: var(--deep-ocean); color: white; }

.sponsor-grid {
  display: grid;
  gap: 20px;
}
.sponsor-grid.diamond { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.sponsor-grid.gold { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.sponsor-grid.silver { grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
.sponsor-logo-box {
  aspect-ratio: 16/9;
  background: white;
  border: 1px solid var(--fog);
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  padding: 20px;
  color: var(--muted);
  font-weight: 600;
  transition: all .2s ease;
}
.sponsor-logo-box:hover {
  border-color: var(--tech-green);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.sponsor-cta {
  background: linear-gradient(135deg, var(--deep-ocean), var(--deep-ocean-2));
  color: white;
  border-radius: var(--radius-lg);
  padding: 56px 48px;
  text-align: center;
  margin-top: 48px;
}
.sponsor-cta h3 { font-size: 28px; margin-bottom: 14px; }
.sponsor-cta p { color: rgba(255,255,255,0.8); margin-bottom: 28px; max-width: 560px; margin-left: auto; margin-right: auto; }

/* ---------- Footer ---------- */
.footer {
  background: #061828;
  color: rgba(255,255,255,0.7);
  padding: 64px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer h5 {
  color: white;
  font-size: 15px;
  margin-bottom: 18px;
  letter-spacing: 1px;
}
.footer-links li { margin-bottom: 10px; }
.footer-links a {
  color: rgba(255,255,255,0.6);
  font-size: 14px;
  transition: color .2s ease;
}
.footer-links a:hover { color: var(--tech-green); }
.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  margin-top: 16px;
  max-width: 380px;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: rgba(255,255,255,0.4);
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- Modal / Toast ---------- */
.toast {
  position: fixed;
  bottom: 30px; right: 30px;
  background: var(--deep-ocean);
  color: white;
  padding: 16px 24px;
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  z-index: 9999;
  transform: translateY(200%);
  transition: transform .3s ease;
  display: flex;
  align-items: center;
  gap: 12px;
}
.toast.show { transform: translateY(0); }
.toast.success { background: #008A5C; }
.toast.error { background: var(--danger); }

/* ---------- Page Banner (secondary pages) ---------- */
.page-banner {
  background:
    radial-gradient(ellipse at top right, rgba(0,229,160,0.15) 0%, transparent 50%),
    linear-gradient(135deg, #061828 0%, var(--deep-ocean) 100%);
  color: white;
  padding: 160px 32px 80px;
  text-align: center;
}
.page-banner h1 {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -1px;
}
.page-banner p {
  font-size: 17px;
  color: rgba(255,255,255,0.72);
  max-width: 680px;
  margin: 0 auto;
}
.breadcrumb {
  font-size: 13px;
  color: var(--tech-green);
  letter-spacing: 2px;
  margin-bottom: 18px;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero-content { grid-template-columns: 1fr; }
  .hero-visual { max-width: 400px; margin: 40px auto 0; }
  .pillars-grid { grid-template-columns: 1fr; }
  .register-wrap { grid-template-columns: 1fr; }
  .ticket-panel { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--deep-ocean);
    flex-direction: column;
    padding: 24px 32px;
    gap: 20px;
    border-top: 1px solid rgba(255,255,255,0.08);
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .form-row { grid-template-columns: 1fr; }
  .agenda-item { grid-template-columns: 1fr; gap: 8px; }
}
@media (max-width: 560px) {
  .section { padding: 64px 0; }
  .hero { padding: 130px 20px 80px; }
  .container { padding: 0 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .countdown-bar { flex-direction: column; text-align: center; }
  .hero-stat-card.s1, .hero-stat-card.s2, .hero-stat-card.s3 { display: none; }
  .form-card { padding: 28px 22px; }
}