/* ===================================================
   升國七家長講座 — Premium Parchment Landing Page
   =================================================== */

/* --- Custom Properties --- */
:root {
  --bg-parchment: #F2EDE6;
  --bg-warm: #EDE7DC;
  --bg-section-alt: #F5F0E9;
  --text-primary: #3A3226;
  --text-secondary: #5C5245;
  --text-light: #7A7062;
  --accent-gold: #8B7A2E;
  --accent-gold-light: #A89538;
  --accent-coral: #C25B4E;
  --accent-coral-light: #D4736A;
  --border-muted: rgba(58, 50, 38, 0.12);
  --border-light: rgba(58, 50, 38, 0.06);
  --shadow-soft: 0 2px 16px rgba(58, 50, 38, 0.07);
  --shadow-card: 0 1px 8px rgba(58, 50, 38, 0.06);
  --shadow-hover: 0 6px 24px rgba(58, 50, 38, 0.13);
  --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;

  /* Parchment base */
  background-color: var(--bg-parchment);

  /* CSS-only paper texture: layered fine gradients */
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(139, 122, 46, 0.013) 2px,
      rgba(139, 122, 46, 0.013) 3px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 3px,
      rgba(58, 50, 38, 0.009) 3px,
      rgba(58, 50, 38, 0.009) 4px
    ),
    repeating-linear-gradient(
      45deg,
      transparent,
      transparent 5px,
      rgba(139, 122, 46, 0.006) 5px,
      rgba(139, 122, 46, 0.006) 6px
    ),
    radial-gradient(ellipse at 20% 10%, rgba(200, 180, 140, 0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 90%, rgba(200, 180, 140, 0.08) 0%, transparent 45%),
    radial-gradient(ellipse at 50% 50%, transparent 40%, rgba(215, 205, 190, 0.08) 100%);
}

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(1.6rem, 4vw, 2.4rem);
  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);
}

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

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

/* Decorative divider */
.divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin: 0 auto;
  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: 0.6;
}

/* --- Navigation --- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(242, 237, 230, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  transition: box-shadow var(--transition);
}

.site-nav.scrolled {
  box-shadow: 0 1px 12px rgba(58, 50, 38, 0.08);
}

.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;
}

/* --- Hamburger button (hidden on desktop) --- */
.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 {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 1rem;
  }

  .site-nav .nav-title {
    font-family: var(--font-serif);
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-primary);
  }

  .nav-mobile-menu {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(242, 237, 230, 0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-muted);
    box-shadow: 0 4px 20px rgba(58, 50, 38, 0.1);
    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: rgba(139, 122, 46, 0.06);
  }

  .nav-mobile-cta {
    margin: 0.5rem 1.5rem 0.75rem;
    padding: 0.65rem 1.5rem !important;
    background: var(--accent-gold);
    color: #fff !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: #fff !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: #fff !important;
  padding: 0.45rem 1rem !important;
  border-radius: 20px;
  font-weight: 600;
  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: #fff !important;
  transform: translateY(-1px);
}

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

/* --- Hero Section --- */
.hero {
  padding: 2rem 1.5rem 3rem;
  overflow: hidden;
}

.hero-grid {
  max-width: var(--content-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}

.hero-text {
  order: 2;
}

.hero-tagline {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-gold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  padding: 0.3rem 0.8rem;
  border: 1px solid var(--accent-gold);
  border-radius: 20px;
}

.hero h1 {
  margin-bottom: 0.6rem;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-family: var(--font-serif);
}

.hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  margin-bottom: 1.8rem;
  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;
  gap: 1rem;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  background: var(--accent-gold);
  color: #fff;
  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: 0 2px 12px rgba(139, 122, 46, 0.25);
}

.btn-primary:hover {
  background: var(--accent-gold-light);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(139, 122, 46, 0.35);
}

.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 area */
.hero-portrait {
  order: 1;
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-portrait-frame {
  position: relative;
  width: 280px;
  max-width: 100%;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.hero-portrait-frame img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
}

/* Feathered gradient overlay to blend portrait into parchment */
.hero-portrait-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  background:
    linear-gradient(to bottom, transparent 88%, var(--bg-parchment) 100%),
    linear-gradient(to right, var(--bg-parchment) 0%, transparent 12%, transparent 88%, var(--bg-parchment) 100%);
  pointer-events: none;
}

/* --- Section: Audience (Designed for You) --- */
.audience {
  background: var(--bg-section-alt);
  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: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius);
  padding: 1.8rem 1.5rem;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-card);
}

.audience-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.audience-card .icon {
  width: 52px;
  height: 52px;
  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;
}

/* --- Comparison Sections --- */
.comparison {
  padding-top: 3.5rem;
  padding-bottom: 3.5rem;
}

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

.comparison h2 {
  margin-bottom: 2rem;
}

.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(0.95rem, 2vw, 1.2rem);
}

.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: #fff;
}

.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: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-sm);
  padding: 1rem 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;
  color: var(--accent-gold);
  margin-top: 2px;
}

.comparison-card.negative .row-icon {
  color: var(--accent-coral-light);
  opacity: 0.75;
}

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

/* Tiny VS divider between columns */
.vs-marker {
  display: none; /* show only on desktop if desired */
}

/* --- CTA / Signup Section --- */
.signup {
  padding: 4rem 1.5rem 3rem;
}

.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 .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-info .speaker-name {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.3rem;
}

.signup-info .lecture-title {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.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;
}

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

.signup-fallback {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-top: 0.5rem;
  text-align: center;
}

/* --- Speaker Story Section --- */
.story {
  background: var(--bg-section-alt);
  padding: 4rem 1.5rem;
}

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

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

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

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

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

.story-body strong {
  color: var(--text-primary);
  font-weight: 700;
}

/* --- What You'll Learn Section --- */
.learn {
  padding: 4rem 1.5rem;
}

.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: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.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: #fff;
  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;
}

/* --- Emotional Close Section --- */
.closing {
  padding: 4rem 1.5rem 3rem;
}

.closing-block {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
}

.closing-block h2 {
  margin-bottom: 1rem;
}

.closing-block p {
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 1rem;
}

.closing-invite {
  font-family: var(--font-serif);
  font-size: 1.05rem !important;
  font-weight: 600;
  color: var(--text-primary) !important;
  margin-bottom: 1.8rem !important;
}

.closing-block .btn-primary {
  margin-top: 0.5rem;
}

/* --- 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);
}

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

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

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

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

  .hero {
    padding: 4rem 2rem 4.5rem;
  }

  .hero-grid {
    grid-template-columns: 1fr 0.85fr;
    gap: 3rem;
  }

  .hero-text {
    order: 1;
  }

  .hero-portrait {
    order: 2;
  }

  .hero-portrait-frame {
    width: 320px;
  }

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

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

/* Desktop */
@media (min-width: 1024px) {
  .hero-portrait-frame {
    width: 360px;
  }

  .hero-grid {
    gap: 4rem;
  }

  .comparison-card {
    padding: 1.2rem 1.3rem;
  }

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

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

/* Small mobile tweaks */
@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: 0.9rem;
  }

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

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

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

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