/* ===================================================
   獵豹數學 家長講座 — Dark + Gold Power Theme
   =================================================== */

/* --- Custom Properties --- */
:root {
  --bg-dark: #2A2A48;
  --bg-card: #353558;
  --bg-section-alt: #262644;
  --bg-hero: #22223C;
  --text-primary: #F5F2EC;
  --text-secondary: #CFC7BB;
  --text-light: #A8A097;
  --accent-gold: #DBAF4C;
  --accent-gold-light: #E8C466;
  --accent-gold-dim: rgba(219, 175, 76, 0.16);
  --accent-coral: #E85858;
  --accent-coral-light: #EE7A7A;
  --accent-green: #56D47A;
  --border-muted: rgba(219, 175, 76, 0.15);
  --border-light: rgba(240, 237, 232, 0.08);
  --glass-bg: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.13);
  --shadow-soft: 0 2px 20px rgba(0, 0, 0, 0.25);
  --shadow-card: 0 1px 12px rgba(0, 0, 0, 0.18);
  --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.35);
  --shadow-gold: 0 4px 20px rgba(219, 175, 76, 0.28);
  --radius: 14px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-serif: Georgia, "Times New Roman", "Noto Serif TC", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --content-max: 1080px;
  --section-padding: 5rem 1.5rem;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 60px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  line-height: 1.75;
  font-size: 16px;
  min-height: 100vh;
  background-color: var(--bg-dark);

  /* Subtle grid texture on dark */
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 60px,
      rgba(212, 168, 67, 0.015) 60px,
      rgba(212, 168, 67, 0.015) 61px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 60px,
      rgba(212, 168, 67, 0.015) 60px,
      rgba(212, 168, 67, 0.015) 61px
    ),
    radial-gradient(ellipse at 20% 10%, rgba(212, 168, 67, 0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 90%, rgba(212, 168, 67, 0.03) 0%, transparent 45%);
}

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

a {
  color: var(--accent-gold);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--accent-gold-light);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-primary);
}

h1 {
  font-size: clamp(1.7rem, 4.5vw, 2.6rem);
  letter-spacing: -0.01em;
}

h2 {
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  text-align: center;
  margin-bottom: 0.5em;
}

h3 {
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
}

p {
  color: var(--text-secondary);
}

/* --- Layout Helpers --- */
.content-wrap {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  position: relative;
  padding: var(--section-padding);
}

/* Section fades */
.section-fade {
  display: block;
  width: 100%;
  height: 80px;
  background: linear-gradient(to bottom, var(--bg-dark), var(--bg-section-alt));
  pointer-events: none;
}

.section-fade--reverse {
  background: linear-gradient(to bottom, var(--bg-section-alt), var(--bg-dark));
}

/* Decorative divider */
.divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin: 0 auto 2rem;
  max-width: 200px;
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-gold), transparent);
}

.divider-diamond {
  width: 6px;
  height: 6px;
  background: var(--accent-gold);
  transform: rotate(45deg);
  flex-shrink: 0;
  opacity: 0.7;
}

/* --- Navigation --- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(26, 26, 46, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  transition: box-shadow var(--transition);
}

.site-nav.scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.4);
}

.nav-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  padding: 0 1rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.nav-inner::-webkit-scrollbar {
  display: none;
}

.nav-burger {
  display: none;
}

.nav-mobile-menu {
  display: none;
}

@media (max-width: 900px) {
  .nav-inner {
    display: none;
  }

  .nav-burger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 36px;
    height: 36px;
    padding: 6px;
    z-index: 3;
  }

  .nav-burger span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: transform 0.3s, opacity 0.3s;
  }

  .nav-burger.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-burger.open span:nth-child(2) {
    opacity: 0;
  }

  .nav-burger.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .site-nav {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 1rem;
  }

  .nav-mobile-menu {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(26, 26, 46, 0.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-muted);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
    padding: 0.5rem 0;
    z-index: 2;
  }

  .nav-mobile-menu.open {
    display: flex;
  }

  .nav-mobile-menu a {
    padding: 0.75rem 1.5rem;
    font-size: 0.92rem;
    color: var(--text-secondary);
    transition: background var(--transition), color var(--transition);
  }

  .nav-mobile-menu a:hover,
  .nav-mobile-menu a.active {
    color: var(--accent-gold);
    background: var(--accent-gold-dim);
  }

  .nav-mobile-cta {
    margin: 0.5rem 1.5rem 0.75rem;
    padding: 0.65rem 1.5rem !important;
    background: var(--accent-gold);
    color: var(--bg-dark) !important;
    border-radius: 50px;
    font-weight: 700;
    text-align: center;
    font-size: 0.92rem !important;
  }

  .nav-mobile-cta:hover {
    background: var(--accent-gold-light);
    color: var(--bg-dark) !important;
  }
}

.nav-inner a {
  display: block;
  padding: 0.75rem 0.45rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
  white-space: nowrap;
  transition: color var(--transition);
  position: relative;
  letter-spacing: 0.01em;
}

.nav-inner a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 2px;
  background: var(--accent-gold);
  transition: transform var(--transition);
  border-radius: 1px;
}

.nav-inner a:hover,
.nav-inner a.active {
  color: var(--accent-gold);
}

.nav-inner a.active::after {
  transform: translateX(-50%) scaleX(1);
}

.nav-cta {
  background: var(--accent-gold);
  color: var(--bg-dark) !important;
  padding: 0.45rem 1rem !important;
  border-radius: 20px;
  font-weight: 700;
  font-size: 0.78rem !important;
  margin-left: 0.5rem;
  transition: background var(--transition), transform var(--transition) !important;
}

.nav-cta:hover {
  background: var(--accent-gold-light);
  color: var(--bg-dark) !important;
  transform: translateY(-1px);
}

.nav-cta::after {
  display: none !important;
}

/* --- Hero Section — Editorial Portrait (王金平 style) --- */
.hero {
  position: relative;
  padding: 0;
  overflow: hidden;
  background: #1C1C36;
}

/* Portrait zone — capped width so framing stays consistent across all screens */
.hero-portrait-bg {
  position: relative;
  width: 100%;
  max-width: 960px;        /* lock framing — photo doesn't stretch beyond this */
  margin: 0 auto;          /* center on wide monitors */
  height: 70vh;
  min-height: 440px;
  max-height: 780px;
  overflow: hidden;
}

.hero-portrait-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 18%;
}

/* Bottom + side fades on the portrait container */
.hero-portrait-fade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to bottom, rgba(28,28,54,0.1) 0%, rgba(28,28,54,0) 20%, rgba(28,28,54,0.4) 80%, #1C1C36 100%),
    linear-gradient(to right, rgba(28,28,54,0.5) 0%, transparent 20%, transparent 80%, rgba(28,28,54,0.5) 100%);
  pointer-events: none;
}

/* On wide screens, add extra side fades on the hero itself for seamless blending */
.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 780px;
  background: linear-gradient(to right, #1C1C36 0%, transparent 15%, transparent 85%, #1C1C36 100%);
  z-index: 1;
  pointer-events: none;
}

/* Hero content — below the portrait */
.hero-content {
  position: relative;
  z-index: 2;
  max-width: var(--content-max);
  margin: -100px auto 0;
  padding: 0 1.5rem 3rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.5rem;
  /* Pull up slightly to overlap the fade zone */
  margin-top: -3rem;
}

.hero-tagline {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-gold);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 0.3rem 1rem;
  border: 1px solid rgba(212, 168, 67, 0.4);
  border-radius: 20px;
  background: rgba(212, 168, 67, 0.08);
}

/* Editorial title */
.hero-editorial {
  margin-bottom: 0.5rem;
}

.hero-title-main {
  font-size: clamp(2rem, 5.5vw, 3.2rem);
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.04em;
  margin-bottom: 0.3rem;
  text-shadow: 0 2px 30px rgba(0,0,0,0.5);
}

.hero-title-sub {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: var(--accent-gold-light);
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: 0.06em;
}

/* 王金平-style speaker info — clean, no card box */
.hero-speaker-info {
  text-align: center;
  width: 100%;
  max-width: 580px;
}

/* Tagline with red lines (王金平 style) */
.speaker-tagline-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  margin-bottom: 0.4rem;
}

.speaker-red-line {
  display: block;
  width: 40px;
  height: 1.5px;
  background: #B91C1C;
}

.speaker-tagline-text {
  font-family: var(--font-serif);
  font-size: 0.82rem;
  color: #D4D4D4;
  letter-spacing: 0.15em;
  white-space: nowrap;
}

.speaker-name-big {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: 0.08em;
  margin-bottom: 0.6rem;
  text-align: center;
}

.speaker-credentials {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.speaker-credentials p {
  font-size: 0.82rem;
  color: #BFBFBF;
  line-height: 1.5;
  letter-spacing: 0.02em;
}

/* Other speakers */
.hero-other-speakers {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}

.speaker-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.8rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 50px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.speaker-chip svg {
  width: 14px;
  height: 14px;
  color: var(--accent-gold);
}

.hero-facts {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.5rem;
  font-size: 0.88rem;
  color: var(--text-light);
}

.hero-facts li {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.hero-facts svg {
  width: 16px;
  height: 16px;
  color: var(--accent-gold);
  flex-shrink: 0;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  background: var(--accent-gold);
  color: var(--bg-dark);
  font-size: 1rem;
  font-weight: 700;
  border-radius: 50px;
  letter-spacing: 0.04em;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-gold);
}

.btn-primary:hover {
  background: var(--accent-gold-light);
  color: var(--bg-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(212, 168, 67, 0.4);
}

.btn-primary:focus-visible {
  outline: 3px solid var(--accent-gold-light);
  outline-offset: 3px;
}

.btn-primary svg {
  width: 18px;
  height: 18px;
}

.urgency {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-coral);
}

/* (portrait is now full-bleed hero background) */

/* --- Problem Statement Section --- */
.problem {
  background: var(--bg-section-alt);
  padding: 4rem 1.5rem;
}

.problem-block {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.problem-block h2 {
  margin-bottom: 0.3em;
}

.problem-subtitle {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--text-light);
  margin-bottom: 1.5rem;
}

.problem-body {
  text-align: left;
  margin-top: 1.5rem;
}

.problem-body p {
  margin-bottom: 1rem;
  font-size: 0.95rem;
  line-height: 1.85;
}

.problem-body strong {
  color: var(--accent-gold-light);
  font-weight: 700;
}

/* --- Section: Audience (Designed for You) --- */
.audience {
  background: var(--bg-dark);
  padding-bottom: 4rem;
}

.audience h2 {
  margin-bottom: 0.3em;
}

.audience-subtitle {
  text-align: center;
  color: var(--text-light);
  font-size: 0.92rem;
  margin-bottom: 2.5rem;
}

.audience-grid {
  max-width: 720px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.audience-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 1.8rem 1.5rem;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  box-shadow: var(--shadow-card);
}

.audience-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--accent-gold-dim);
}

.audience-card .icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 1rem;
  color: var(--accent-gold);
}

.audience-card p {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text-primary);
  font-weight: 500;
}

/* --- What You'll Learn --- */
.learn {
  padding: 4rem 1.5rem;
  background: var(--bg-dark);
}

.learn-intro {
  max-width: 720px;
  margin: 0 auto 2rem;
  text-align: center;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

.learn-points {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.learn-card {
  display: flex;
  align-items: flex-start;
  gap: 1.2rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.learn-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  border-color: var(--accent-gold-dim);
}

.learn-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  min-width: 36px;
  border-radius: 50%;
  background: var(--accent-gold);
  color: var(--bg-dark);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1rem;
}

.learn-card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.35em;
  color: var(--text-primary);
}

.learn-card p {
  font-size: 0.92rem;
  line-height: 1.65;
}

/* --- Comparison Sections --- */
.comparison {
  padding-top: 3.5rem;
  padding-bottom: 3.5rem;
  background: var(--bg-dark);
}

.comparison--alt {
  background: var(--bg-section-alt);
}

.comparison h2 {
  margin-bottom: 0.5rem;
}

.comparison-headers {
  max-width: 720px;
  margin: 0 auto 1.2rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.comparison-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.comparison-header h3 {
  font-size: clamp(0.85rem, 2vw, 1.15rem);
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  font-size: 0.85rem;
  font-weight: 800;
  flex-shrink: 0;
}

.badge-x {
  background: var(--accent-coral);
  color: #fff;
}

.badge-check {
  background: var(--accent-gold);
  color: var(--bg-dark);
}

.comparison-rows {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.comparison-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.comparison-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-card);
}

.comparison-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.comparison-card .row-icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  margin-top: 2px;
}

.comparison-card.negative .row-icon {
  color: var(--accent-coral-light);
  opacity: 0.7;
}

.comparison-card.positive .row-icon {
  color: var(--accent-gold);
}

.comparison-card .row-icon {
  color: var(--accent-gold);
}

.comparison-card p {
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text-primary);
}

.comparison-card.negative {
  border-color: rgba(224, 82, 82, 0.12);
}

.comparison-card.positive {
  border-color: rgba(212, 168, 67, 0.15);
}

/* --- Insider Section (Leslie) --- */
.insider {
  background: var(--bg-dark);
  padding: 4rem 1.5rem;
}

.insider-block {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

/* Leslie portrait + header layout */
.insider-header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  text-align: left;
  margin-bottom: 1.5rem;
}

.insider-portrait {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
  border: 2px solid rgba(219, 175, 76, 0.3);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  background: var(--bg-card);
}

.insider-portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 20%;
}

.insider-header-text {
  flex: 1;
}

.insider-block h2 {
  margin-bottom: 0.25em;
  text-align: left;
}

.insider-subtitle {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  color: var(--text-light);
  margin-bottom: 0.5rem;
  text-align: left;
}

.insider-speaker-name {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-gold);
  letter-spacing: 0.03em;
  padding: 0.2rem 0.7rem;
  background: var(--accent-gold-dim);
  border-radius: 20px;
}

.insider-body {
  text-align: left;
  margin-top: 1.5rem;
}

.insider-body p {
  margin-bottom: 1rem;
  font-size: 0.95rem;
  line-height: 1.85;
}

.insider-body strong {
  color: var(--accent-gold-light);
  font-weight: 700;
}

/* --- Social Proof Section --- */
/* --- Social Proof — Prestige Hall of Fame --- */
.proof {
  position: relative;
  background: var(--bg-section-alt);
  padding: 5rem 1.5rem 4rem;
  overflow: hidden;
}

/* Subtle radial glow behind section */
.proof::before {
  content: '';
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(ellipse, rgba(212,168,67,0.06) 0%, transparent 70%);
  pointer-events: none;
}

/* Gold accent line at top */
.proof-accent-line {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-gold), transparent);
}

/* Header block */
.proof-header {
  text-align: center;
  margin-bottom: 2.5rem;
  position: relative;
}

.proof-crown {
  display: inline-block;
  width: 48px;
  height: 32px;
  color: var(--accent-gold);
  margin-bottom: 0.6rem;
  opacity: 0.7;
}

.proof-logo {
  display: block;
  margin: 0 auto 1.4rem;
  height: 64px;
  width: auto;
  padding: 10px 20px;
  background: rgba(255, 255, 255, 0.95);
  border-radius: 10px;
  object-fit: contain;
}

.proof-header h2 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  color: #fff;
  margin-bottom: 1rem;
  letter-spacing: 0.06em;
}

/* AMC Banner */
.amc-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin: 1.2rem auto 1.5rem;
  padding: 1rem 2rem;
  max-width: 520px;
  background: linear-gradient(135deg, rgba(255, 215, 0, 0.15), rgba(255, 180, 0, 0.08));
  border: 1.5px solid var(--accent-gold);
  border-radius: 12px;
  position: relative;
  overflow: hidden;
  animation: amcGlow 3s ease-in-out infinite;
}

.amc-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent 40%, rgba(255, 215, 0, 0.1) 50%, transparent 60%);
  animation: amcShimmer 4s ease-in-out infinite;
}

.amc-star {
  font-size: 1.6rem;
  color: var(--accent-gold);
  filter: drop-shadow(0 0 6px rgba(255, 215, 0, 0.6));
  animation: amcPulse 2s ease-in-out infinite;
}

.amc-text {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: #fff;
  text-align: center;
  line-height: 1.6;
  letter-spacing: 0.08em;
  margin: 0;
  position: relative;
  z-index: 1;
}

.amc-text strong {
  color: var(--accent-gold);
  font-size: 1.15em;
  text-shadow: 0 0 12px rgba(255, 215, 0, 0.4);
}

@keyframes amcGlow {
  0%, 100% { box-shadow: 0 0 15px rgba(255, 215, 0, 0.15); }
  50% { box-shadow: 0 0 25px rgba(255, 215, 0, 0.3); }
}

@keyframes amcShimmer {
  0% { transform: translateX(-100%) rotate(45deg); }
  100% { transform: translateX(100%) rotate(45deg); }
}

@keyframes amcPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.15); }
}

.proof-subtitle {
  color: var(--text-light);
  font-size: 0.9rem;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.75;
}

/* Stat counters row */
.proof-stats {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2rem;
  max-width: 620px;
  margin: 0 auto 3rem;
  padding: 1.5rem 2rem;
  background: rgba(212,168,67,0.04);
  border: 1px solid rgba(212,168,67,0.15);
  border-radius: var(--radius);
}

.proof-stat {
  text-align: center;
  flex: 1;
}

.stat-number {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 700;
  color: var(--accent-gold);
  letter-spacing: 0.02em;
  line-height: 1.2;
}

.stat-label {
  display: block;
  font-size: 0.72rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-top: 0.3rem;
}

.proof-stat-divider {
  width: 1px;
  height: 40px;
  background: rgba(212,168,67,0.2);
  flex-shrink: 0;
}

/* Hall of Fame grid */
.proof-hall {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

/* School group */
.proof-school {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color var(--transition);
}

.proof-school:hover {
  border-color: rgba(212,168,67,0.2);
}

.school-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(212,168,67,0.12);
}

.school-crest {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(212,168,67,0.2), rgba(212,168,67,0.05));
  border: 1px solid rgba(212,168,67,0.3);
  font-family: var(--font-serif);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-gold);
  flex-shrink: 0;
}

.school-name {
  font-size: 1rem;
  color: var(--accent-gold);
  font-family: var(--font-serif);
  letter-spacing: 0.08em;
}

/* Student cards */
.proof-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
}

.proof-card {
  position: relative;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1.1rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  overflow: hidden;
}

.proof-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.3);
  border-color: rgba(212,168,67,0.15);
}

.card-top {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.35rem;
}

.proof-badge {
  display: inline-block;
  padding: 0.15rem 0.55rem;
  background: var(--accent-gold-dim);
  color: var(--accent-gold);
  font-size: 0.68rem;
  font-weight: 700;
  border-radius: 20px;
  white-space: nowrap;
  flex-shrink: 0;
  letter-spacing: 0.03em;
}

.proof-badge.intl {
  background: rgba(78, 203, 113, 0.12);
  color: var(--accent-green);
}

.proof-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-primary) !important;
  white-space: nowrap;
}

.proof-detail {
  font-size: 0.82rem;
  color: var(--text-secondary) !important;
  line-height: 1.55;
}

/* Medal icon for Olympiad medalists */
.card-medal {
  position: absolute;
  top: 0.7rem;
  right: 0.7rem;
  width: 22px;
  height: 22px;
  color: var(--accent-gold);
  opacity: 0.5;
}

/* Bottom prestige claims */
.proof-claims {
  max-width: 720px;
  margin: 2.5rem auto 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
}

.claim {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.2rem;
  background: linear-gradient(135deg, rgba(212,168,67,0.08), rgba(212,168,67,0.02));
  border: 1px solid rgba(212,168,67,0.2);
  border-radius: 50px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-gold);
  letter-spacing: 0.02em;
}

.claim-icon {
  font-size: 0.55rem;
  opacity: 0.6;
}

/* --- CTA / Signup Section --- */
.signup {
  padding: 4rem 1.5rem 3rem;
  background: var(--bg-dark);
}

.signup-wrap {
  max-width: var(--content-max);
  margin: 0 auto;
}

.signup h2 {
  margin-bottom: 0.3em;
}

.signup-urgency {
  text-align: center;
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent-coral);
  margin-bottom: 2.5rem;
}

.signup-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}

.signup-info {
  font-size: 0.92rem;
}

.signup-info .lecture-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.signup-info .info-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.7rem;
  color: var(--text-secondary);
}

.signup-info .info-item svg {
  width: 18px;
  height: 18px;
  color: var(--accent-gold);
  flex-shrink: 0;
}

.signup-cta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-top: 1.5rem;
}

.signup-qr {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.signup-qr-frame {
  width: 220px;
  height: 220px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-muted);
  box-shadow: var(--shadow-soft);
  background: #fff;
  position: relative;
}

.signup-qr-frame img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 0.5rem;
}

.placeholder-qr {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px dashed var(--border-muted);
}

.placeholder-qr p {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-light);
  opacity: 0.5;
}

.signup-qr-caption {
  font-size: 0.85rem;
  color: var(--text-light);
  text-align: center;
  max-width: 220px;
}

/* --- Footer --- */
.site-footer {
  text-align: center;
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--border-light);
  font-size: 0.8rem;
  color: var(--text-light);
  background: var(--bg-hero);
}

.site-footer span {
  margin: 0 0.3rem;
}

/* --- Scroll Reveal Animation --- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Focus states --- */
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--accent-gold-light);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ===================================================
   Responsive
   =================================================== */

@media (min-width: 520px) {
  .audience-grid {
    grid-template-columns: 1fr 1fr;
  }

  .proof-cards {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  }
}

@media (min-width: 768px) {
  :root {
    --section-padding: 5.5rem 2rem;
  }

  .hero-content {
    padding: 5rem 2rem 4rem;
  }

  .signup-grid {
    grid-template-columns: 1fr auto;
    gap: 3rem;
  }

  .nav-inner a {
    font-size: 0.88rem;
    padding: 0.75rem 0.9rem;
  }

  .proof-hall {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .comparison-card {
    padding: 1.2rem 1.3rem;
  }

  .comparison-card p {
    font-size: 0.92rem;
  }

  .nav-inner {
    gap: 0.5rem;
  }
}

/* Small mobile */
@media (max-width: 480px) {
  .comparison-card {
    padding: 0.7rem 0.6rem;
    gap: 0.35rem;
  }

  .comparison-card .row-icon {
    display: none;
  }

  .comparison-card p {
    font-size: 0.82rem;
  }

  .comparison-header h3 {
    font-size: 0.85rem;
  }

  .badge {
    width: 24px;
    height: 24px;
    font-size: 0.75rem;
  }

  .hero-tagline {
    font-size: 0.7rem;
  }

  .insider-header {
    flex-direction: column;
    text-align: center;
  }

  .insider-portrait {
    width: 90px;
    height: 90px;
  }

  .insider-block h2,
  .insider-subtitle {
    text-align: center;
  }

  .speaker-name-big {
    font-size: 1.6rem;
  }

  .speaker-credentials p {
    font-size: 0.75rem;
  }

  .speaker-red-line {
    width: 28px;
  }

  .hero-portrait-bg {
    height: 55vh;
    min-height: 340px;
  }

  .hero-content {
    margin-top: -80px;
    padding: 0 1rem 2rem;
    gap: 0.8rem;
  }

  .audience-card {
    padding: 1.3rem 1rem;
  }

  .signup-qr-frame {
    width: 180px;
    height: 180px;
  }

  .proof-school {
    padding: 1rem;
  }

  .proof-stats {
    flex-direction: column;
    gap: 1rem;
    padding: 1.2rem;
  }

  .proof-stat-divider {
    width: 60px;
    height: 1px;
  }

  .claim {
    font-size: 0.75rem;
    padding: 0.45rem 0.9rem;
  }

  .speaker-chip {
    font-size: 0.75rem;
    padding: 0.25rem 0.6rem;
  }
}