/* ================================================================
   YTEC NV — Young Travelling Entrepreneurs Convention
   Modern Event Website Styles
   ================================================================ */

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

:root {
  /* Color palette - Modern & Professional */
  --clr-primary:    #0f52ba;  /* Royal blue */
  --clr-primary-dk: #0a3d8f;
  --clr-primary-lt: #2b6dd1;
  --clr-accent:     #f59e0b;  /* Amber */
  --clr-accent-lt:  #fbbf24;
  --clr-navy:       #1e293b;
  --clr-navy-lt:    #334155;
  --clr-slate:      #64748b;
  --clr-slate-lt:   #94a3b8;
  --clr-white:      #ffffff;
  --clr-off-white:  #f8fafc;
  --clr-light-gray: #e2e8f0;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;

  /* Spacing scale */
  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  2rem;
  --space-lg:  3rem;
  --space-xl:  5rem;
  --space-2xl: 8rem;

  /* Layout */
  --max-width: 1200px;
  --radius:    12px;
  --radius-sm: 8px;
  --nav-h:     80px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.16);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--clr-navy);
  line-height: 1.6;
  overflow-x: hidden;
  background: var(--clr-white);
}

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

svg {
  display: block;
}

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

ul {
  list-style: none;
}

/* ─── Utilities ──────────────────────────────────────────────── */
.container {
  width: 92%;
  max-width: var(--max-width);
  margin-inline: auto;
}

.section {
  padding: var(--space-xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.section-eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--clr-primary);
  margin-bottom: var(--space-xs);
}

.section-header h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  color: var(--clr-navy);
  line-height: 1.2;
  font-weight: 700;
}

/* ─── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.02em;
  transition: all 0.25s ease;
  cursor: pointer;
  border: 2px solid transparent;
  text-align: center;
}

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

.btn-primary {
  background: var(--clr-primary);
  color: var(--clr-white);
}
.btn-primary:hover {
  background: var(--clr-primary-dk);
}

.btn-outline {
  background: transparent;
  color: var(--clr-primary);
  border-color: var(--clr-primary);
}
.btn-outline:hover {
  background: var(--clr-primary);
  color: var(--clr-white);
}

/* ─── Header / Navigation ────────────────────────────────────── */
.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 1000;
  height: var(--nav-h);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  transition: all 0.3s ease;
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 4%;
}

.nav-logo img {
  height: 50px;
  width: auto;
  transition: opacity 0.2s;
}
.nav-logo:hover img {
  opacity: 0.8;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav-links a {
  color: var(--clr-navy);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s;
  position: relative;
}

.nav-links a:not(.nav-cta)::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--clr-primary);
  transform: scaleX(0);
  transition: transform 0.2s;
}

.nav-links a:not(.nav-cta):hover {
  color: var(--clr-primary);
}

.nav-links a:not(.nav-cta):hover::after {
  transform: scaleX(1);
}

.nav-cta {
  background: var(--clr-accent);
  color: var(--clr-white);
  padding: 0.65rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: all 0.2s;
}
.nav-cta:hover {
  background: var(--clr-accent-lt);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

/* Mobile hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  display: block;
  width: 26px;
  height: 2.5px;
  background: var(--clr-navy);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

/* ─── Hero Section ───────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: var(--nav-h);
  background: linear-gradient(135deg, #0f52ba 0%, #1e3a8a 100%);
  overflow: hidden;
}

.hero-background {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(245,158,11,0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(255,255,255,0.08) 0%, transparent 50%),
    linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.15) 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--space-lg) var(--space-sm);
  max-width: 900px;
  margin-inline: auto;
}

.hero-logo {
  margin-bottom: var(--space-md);
}

.hero-logo img {
  height: 120px;
  width: auto;
  margin-inline: auto;
  filter: drop-shadow(0 4px 16px rgba(0,0,0,0.2));
}

.hero-content h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  color: var(--clr-white);
  line-height: 1.2;
  margin-bottom: var(--space-sm);
  letter-spacing: -0.02em;
}

.hero-tagline {
  color: rgba(255,255,255,0.9);
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  margin-bottom: var(--space-md);
  font-weight: 400;
}

.hero-details {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.detail-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--clr-white);
  font-size: 1.05rem;
  font-weight: 500;
}

.detail-item svg {
  width: 24px;
  height: 24px;
  color: var(--clr-accent);
}

.hero-actions {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
}

.hero .btn-outline {
  border-color: rgba(255,255,255,0.7);
  color: var(--clr-white);
}
.hero .btn-outline:hover {
  background: rgba(255,255,255,0.15);
  border-color: var(--clr-white);
}

/* ─── About Section ──────────────────────────────────────────── */
.about {
  background: var(--clr-white);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.about-text .lead {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--clr-navy);
  margin-bottom: var(--space-md);
  line-height: 1.5;
}

.about-text p {
  color: var(--clr-slate);
  margin-bottom: var(--space-sm);
  font-size: 1.05rem;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.stat-card {
  background: linear-gradient(135deg, var(--clr-primary) 0%, var(--clr-primary-dk) 100%);
  padding: var(--space-md);
  border-radius: var(--radius);
  text-align: center;
  color: var(--clr-white);
  box-shadow: var(--shadow-md);
  transition: transform 0.25s;
}

.stat-card:hover {
  transform: translateY(-4px);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 0.5rem;
  color: var(--clr-accent);
}

.stat-label {
  font-size: 0.95rem;
  font-weight: 500;
  opacity: 0.95;
}

/* ─── Schedule Section ───────────────────────────────────────── */
.schedule {
  background: var(--clr-off-white);
}

.schedule-tabs {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.tab-btn {
  background: var(--clr-white);
  border: 2px solid var(--clr-light-gray);
  color: var(--clr-navy);
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.25s;
}

.tab-btn:hover {
  border-color: var(--clr-primary);
  color: var(--clr-primary);
}

.tab-btn.active {
  background: var(--clr-primary);
  border-color: var(--clr-primary);
  color: var(--clr-white);
}

.schedule-content {
  position: relative;
}

.day-schedule {
  display: none;
  max-width: 800px;
  margin-inline: auto;
}

.day-schedule.active {
  display: block;
}

.schedule-item {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: var(--space-md);
  background: var(--clr-white);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-sm);
  border-left: 4px solid var(--clr-light-gray);
  transition: all 0.25s;
}

.schedule-item:hover {
  border-left-color: var(--clr-primary);
  box-shadow: var(--shadow-sm);
}

.schedule-item.highlight {
  border-left-color: var(--clr-accent);
  background: linear-gradient(135deg, rgba(245,158,11,0.05) 0%, rgba(245,158,11,0.02) 100%);
}

.schedule-time {
  font-weight: 700;
  color: var(--clr-primary);
  font-size: 0.95rem;
  padding-top: 0.2rem;
}

.schedule-details h3 {
  font-size: 1.1rem;
  color: var(--clr-navy);
  margin-bottom: 0.4rem;
  font-weight: 600;
}

.schedule-details .speaker {
  font-size: 0.9rem;
  color: var(--clr-accent);
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.schedule-details p {
  color: var(--clr-slate);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* ─── Speakers Section ───────────────────────────────────────── */
.speakers {
  background: var(--clr-white);
}

.speakers-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.speaker-card {
  background: var(--clr-white);
  border: 1px solid var(--clr-light-gray);
  border-radius: var(--radius);
  padding: var(--space-md);
  text-align: center;
  transition: all 0.3s;
}

.speaker-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--clr-primary);
}

.speaker-image {
  margin-bottom: var(--space-sm);
}

.placeholder-avatar {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--clr-primary-lt) 0%, var(--clr-primary) 100%);
  margin-inline: auto;
  position: relative;
  overflow: hidden;
}

.placeholder-avatar::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 65%;
  background: rgba(255,255,255,0.2);
  border-radius: 50% 50% 0 0;
}

.placeholder-avatar::before {
  content: '';
  position: absolute;
  top: 25%;
  left: 50%;
  transform: translateX(-50%);
  width: 35%;
  height: 35%;
  background: rgba(255,255,255,0.25);
  border-radius: 50%;
  z-index: 1;
}

.speaker-card h3 {
  font-size: 1.2rem;
  color: var(--clr-navy);
  margin-bottom: 0.4rem;
  font-weight: 600;
}

.speaker-title {
  color: var(--clr-primary);
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: var(--space-sm);
}

.speaker-bio {
  color: var(--clr-slate);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* ─── Venue Section ──────────────────────────────────────────── */
.venue {
  background: var(--clr-off-white);
}

.venue-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.venue-info .section-eyebrow {
  display: block;
  text-align: left;
}

.venue-info h2 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  color: var(--clr-navy);
  margin-bottom: var(--space-sm);
  text-align: left;
}

.venue-description {
  color: var(--clr-slate);
  font-size: 1.05rem;
  margin-bottom: var(--space-md);
  line-height: 1.6;
}

.venue-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.venue-detail {
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
}

.venue-detail svg {
  width: 24px;
  height: 24px;
  color: var(--clr-primary);
  flex-shrink: 0;
  margin-top: 2px;
}

.venue-detail strong {
  display: block;
  color: var(--clr-navy);
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.venue-detail p {
  color: var(--clr-slate);
  font-size: 0.95rem;
  line-height: 1.5;
}

.venue-map {
  aspect-ratio: 1;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.map-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--clr-primary-lt) 0%, var(--clr-primary) 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  color: var(--clr-white);
}

.map-placeholder svg {
  width: 64px;
  height: 64px;
}

.map-placeholder p {
  font-weight: 600;
  font-size: 1.1rem;
}

/* ─── Registration Section ───────────────────────────────────── */
.register {
  background: var(--clr-white);
}

.tickets-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.ticket-card {
  background: var(--clr-white);
  border: 2px solid var(--clr-light-gray);
  border-radius: var(--radius);
  padding: var(--space-lg) var(--space-md);
  text-align: center;
  position: relative;
  transition: all 0.3s;
}

.ticket-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.ticket-card.featured {
  border-color: var(--clr-primary);
  border-width: 3px;
  box-shadow: var(--shadow-md);
}

.ticket-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--clr-accent);
  color: var(--clr-white);
  padding: 0.4rem 1.2rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.ticket-card h3 {
  font-size: 1.5rem;
  color: var(--clr-navy);
  margin-bottom: var(--space-sm);
  font-weight: 700;
}

.ticket-price {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  margin-bottom: var(--space-xs);
}

.ticket-price .currency {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--clr-primary);
  margin-top: 0.5rem;
  margin-right: 0.2rem;
}

.ticket-price .amount {
  font-size: 4rem;
  font-weight: 800;
  line-height: 1;
  color: var(--clr-primary);
}

.ticket-subtitle {
  color: var(--clr-slate);
  font-size: 0.9rem;
  margin-bottom: var(--space-md);
  font-weight: 500;
}

.ticket-features {
  text-align: left;
  margin-bottom: var(--space-md);
  padding: var(--space-sm) 0;
  border-top: 1px solid var(--clr-light-gray);
  border-bottom: 1px solid var(--clr-light-gray);
}

.ticket-features li {
  color: var(--clr-slate);
  font-size: 0.95rem;
  padding: 0.5rem 0;
  position: relative;
  padding-left: 1.75rem;
}

.ticket-features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--clr-primary);
  font-weight: 700;
}

.register-note {
  text-align: center;
  color: var(--clr-slate);
  font-size: 1rem;
}

.register-note a {
  color: var(--clr-primary);
  font-weight: 600;
  text-decoration: underline;
}

.register-note a:hover {
  color: var(--clr-primary-dk);
}

/* ─── Footer ─────────────────────────────────────────────────── */
.site-footer {
  background: var(--clr-navy);
  color: rgba(255,255,255,0.7);
  padding: var(--space-xl) 0 var(--space-md);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-logo {
  height: 50px;
  width: auto;
  margin-bottom: var(--space-sm);
}

.footer-tagline {
  font-weight: 600;
  color: var(--clr-white);
  margin-bottom: 0.4rem;
  font-size: 0.95rem;
}

.footer-description {
  font-size: 0.9rem;
  line-height: 1.5;
}

.footer-nav h4,
.footer-contact h4 {
  color: var(--clr-white);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
}

.footer-nav ul li {
  margin-bottom: 0.6rem;
}

.footer-nav a {
  font-size: 0.95rem;
  transition: color 0.2s;
}

.footer-nav a:hover {
  color: var(--clr-white);
}

.footer-contact p {
  font-size: 0.95rem;
  margin-bottom: 0.4rem;
}

.footer-contact a {
  transition: color 0.2s;
}

.footer-contact a:hover {
  color: var(--clr-white);
}

.footer-social {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.footer-social a {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.1);
  border-radius: 50%;
  transition: all 0.2s;
}

.footer-social a:hover {
  background: var(--clr-primary);
  transform: translateY(-2px);
}

.footer-social svg {
  width: 18px;
  height: 18px;
}

.footer-bottom {
  padding-top: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.footer-bottom p {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
}

.footer-legal {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
  font-size: 0.85rem;
}

.footer-legal a {
  transition: color 0.2s;
}

.footer-legal a:hover {
  color: var(--clr-white);
}

/* ─── Responsive — Tablet ────────────────────────────────────── */
@media (max-width: 900px) {
  :root {
    --space-xl: 4rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .speakers-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .venue-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .tickets-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin-inline: auto;
    margin-bottom: var(--space-md);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

/* ─── Responsive — Mobile ────────────────────────────────────── */
@media (max-width: 600px) {
  :root {
    --space-xl: 3rem;
    --space-lg: 2rem;
    --nav-h: 70px;
  }

  /* Mobile navigation */
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    inset: 0;
    top: var(--nav-h);
    background: var(--clr-white);
    flex-direction: column;
    justify-content: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(.4,0,.2,1);
    box-shadow: -4px 0 16px rgba(0,0,0,0.1);
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .nav-links a {
    font-size: 1.25rem;
    text-align: center;
  }

  .hero-logo img {
    height: 80px;
  }

  .hero-details {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .about-stats {
    grid-template-columns: 1fr;
  }

  .schedule-item {
    grid-template-columns: 1fr;
    gap: var(--space-xs);
  }

  .schedule-time {
    font-size: 0.85rem;
  }

  .speakers-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin-inline: auto;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-social {
    justify-content: center;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* ─── Accessibility ──────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html {
    scroll-behavior: auto;
  }
}

:focus-visible {
  outline: 3px solid var(--clr-accent);
  outline-offset: 2px;
}

button:focus-visible {
  outline-offset: 4px;
}