/* ═══════════════ BASE ═══════════════ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  /* Telefónica Brand Colors */
  --primary: #031A34;
  --primary-90: rgba(3, 26, 52, 0.92);
  --accent: #0066FF;
  --accent-hover: #0052CC;
  --accent-soft: #3D8BFF;
  --accent-glow: rgba(0, 102, 255, 0.12);
  --accent-subtle: rgba(0, 102, 255, 0.05);
  --background: #FFFFFF;
  --surface: #F5F7FA;
  --surface-warm: #F8F9FC;
  --surface-elevated: #FFFFFF;
  --border: #E2E8F0;
  --border-light: #EEF2F6;
  --border-accent: rgba(0, 102, 255, 0.18);
  --text-primary: #031A34;
  --text-secondary: #4A5568;
  --text-tertiary: #718096;

  /* Spacing & Shape */
  --radius: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-pill: 50px;
  --space: 12px;
  --transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'TelefonicaLight', Arial, Helvetica, sans-serif;
  background: var(--background);
  color: var(--text-primary);
  overflow-x: hidden;
  line-height: 1.65;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'TelefonicaBold', Arial, Helvetica, sans-serif;
  font-weight: 700;
}

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

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 clamp(24px, 5vw, 56px);
  width: 100%;
}

/* ═══════════════ SECTIONS ═══════════════ */
.section {
  display: flex;
  align-items: center;
  position: relative;
  padding: 100px 0;
}

.section.hero {
  min-height: 100vh;
}

.section-label {
  font-family: 'TelefonicaBold', Arial, Helvetica, sans-serif;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--accent);
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}

.section-label::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.6rem);
  font-weight: 700;
  margin-bottom: 48px;
  line-height: 1.2;
  color: var(--primary);
}

/* ═══════════════ HERO ═══════════════ */
.hero {
  background: var(--primary);
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
}

.hero-bg-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('img/hero-bg.png');
  background-size: cover;
  background-position: center;
  opacity: 0.15;
  z-index: 0;
}

#particle-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 0 20px;
}

.hero-logo {
  margin-bottom: 40px;
  opacity: 0;
}

.telefonica-logo {
  height: 40px;
  opacity: 0.8;
  transition: opacity 0.3s;
}

.telefonica-logo:hover {
  opacity: 1;
}

.hero-label {
  font-family: 'TelefonicaLight', Arial, Helvetica, sans-serif;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
  margin-bottom: 32px;
  opacity: 0;
}

.hero-title {
  font-size: clamp(3.2rem, 10vw, 7.5rem);
  font-weight: 700;
  line-height: 0.92;
  margin-bottom: 32px;
  letter-spacing: -0.04em;
  color: #FFFFFF;
}

.hero-title .line {
  display: block;
  opacity: 0;
  transform: translateY(40px);
}

.hero-title .dot {
  color: var(--accent);
}

.hero-sub {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  font-weight: 400;
  color: rgba(255, 255, 255, 0.5);
  max-width: 520px;
  margin: 0 auto 64px;
  opacity: 0;
  line-height: 1.7;
}

.scroll-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  opacity: 0;
}

.scroll-indicator span {
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.25);
}

.scroll-line {
  width: 1px;
  height: 44px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2.5s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.15; transform: scaleY(0.5); }
  50% { opacity: 0.7; transform: scaleY(1); }
}

/* ═══════════════ QUOTE BANNER ═══════════════ */
.quote-banner {
  background: var(--accent);
  padding: 72px 0;
}

.big-quote {
  font-family: 'TelefonicaBold', Arial, Helvetica, sans-serif;
  font-size: clamp(1.3rem, 3vw, 2rem);
  font-weight: 700;
  color: #FFFFFF;
  line-height: 1.45;
  text-align: center;
  max-width: 780px;
  margin: 0 auto;
  position: relative;
}

.big-quote em {
  font-style: normal;
  text-decoration: underline;
  text-decoration-color: rgba(255, 255, 255, 0.35);
  text-underline-offset: 4px;
  text-decoration-thickness: 2px;
}

.quote-mark {
  font-size: 3em;
  line-height: 0;
  vertical-align: -0.15em;
  opacity: 0.3;
  margin-right: 4px;
}

/* ═══════════════ CHALLENGE ═══════════════ */
#challenge {
  background: var(--surface);
  background-image: radial-gradient(circle at 100% 0%, var(--accent-subtle) 0%, transparent 50%);
}

.challenge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.challenge-card {
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  opacity: 0;
  transform: translateY(24px);
  position: relative;
}

.challenge-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  opacity: 0;
  transition: opacity var(--transition);
}

.challenge-card:hover {
  transform: translateY(-4px) !important;
  border-color: var(--border-accent);
  box-shadow: 0 12px 40px rgba(0, 102, 255, 0.08);
}

.challenge-card:hover::before {
  opacity: 1;
}

.card-icon {
  color: var(--accent);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
}

.card-icon svg {
  width: 28px;
  height: 28px;
}

.challenge-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--primary);
}

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

/* ═══════════════ MATCH ═══════════════ */
#match {
  background: var(--background);
}

.match-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.match-row {
  display: grid;
  grid-template-columns: 200px 48px 1fr;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 20px 28px;
  opacity: 0;
  transform: translateX(-24px);
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.match-row:hover {
  border-color: var(--border-accent);
  background: var(--surface-elevated);
  box-shadow: 0 4px 24px rgba(0, 102, 255, 0.05);
}

.match-need {
  font-family: 'TelefonicaBold', Arial, Helvetica, sans-serif;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--accent);
}

.match-connector {
  display: flex;
  justify-content: center;
}

.connector-line {
  width: 32px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
  transform: scaleX(0);
  transform-origin: left;
  opacity: 0.4;
}

.match-bring {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ═══════════════ NUMBERS ═══════════════ */
#numbers {
  background: var(--primary);
  background-image:
    radial-gradient(ellipse 70% 50% at 30% 80%, rgba(0, 102, 255, 0.15) 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 80% 20%, rgba(0, 102, 255, 0.1) 0%, transparent 50%);
  color: #FFFFFF;
}

#numbers .section-label {
  color: var(--accent-soft);
}

#numbers .section-label::after {
  background: var(--accent-soft);
}

#numbers .section-title {
  color: #FFFFFF;
}

.numbers-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 36px 28px;
  text-align: center;
}

.number-card {
  opacity: 0;
  transform: scale(0.85);
  padding: 20px 0;
  border-radius: var(--radius-lg);
  transition: background 0.3s;
}

.number-card:hover {
  background: rgba(255, 255, 255, 0.04);
}

.number {
  font-family: 'TelefonicaBold', Arial, Helvetica, sans-serif;
  font-size: clamp(2.8rem, 6vw, 4rem);
  font-weight: 700;
  color: var(--accent-soft);
  line-height: 1;
  margin-bottom: 8px;
}

.number-label {
  font-size: 0.82rem;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.3px;
}

/* ═══════════════ TIMELINE ═══════════════ */
#timeline {
  background: var(--surface);
  background-image: radial-gradient(circle at 0% 100%, var(--accent-subtle) 0%, transparent 40%);
}

.timeline {
  position: relative;
  padding: 16px 0;
}

.timeline-line {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--border), var(--accent), var(--accent), var(--border));
  transform: translateX(-50%);
  opacity: 0.5;
}

.timeline-item {
  display: flex;
  width: 100%;
  margin-bottom: 28px;
  position: relative;
  opacity: 0;
  transform: translateY(24px);
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-item.left {
  justify-content: flex-start;
  padding-right: calc(50% + 32px);
}

.timeline-item.right {
  justify-content: flex-end;
  padding-left: calc(50% + 32px);
}

.timeline-dot {
  position: absolute;
  left: 50%;
  top: 22px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--border);
  border: 3px solid var(--surface);
  transform: translateX(-50%);
  z-index: 2;
  transition: background 0.3s;
}

.ai-dot {
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-glow);
}

.timeline-card {
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  width: 100%;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.timeline-card:hover {
  border-color: var(--border-accent);
  box-shadow: 0 6px 24px rgba(0, 102, 255, 0.06);
}

.timeline-year {
  font-family: 'TelefonicaBold', Arial, Helvetica, sans-serif;
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.timeline-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin: 4px 0;
  color: var(--primary);
}

.timeline-card p {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.ai-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 10px;
  font-family: 'TelefonicaBold', Arial, Helvetica, sans-serif;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: var(--accent-glow);
  color: var(--accent);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-accent);
}

/* ═══════════════ AI EXPERTISE ═══════════════ */
#ai {
  background: var(--background);
}

.ai-section-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 12px;
}

.ai-section-header .section-title {
  margin-bottom: 0;
}

.ai-hero-image {
  width: 260px;
  height: auto;
  flex-shrink: 0;
  border-radius: var(--radius-lg);
  opacity: 0.9;
  transition: opacity 0.3s;
}

.ai-hero-image:hover {
  opacity: 1;
}

.ai-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 48px;
}

.ai-card {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  opacity: 0;
  transform: translateY(20px);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.ai-card::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 80px;
  height: 80px;
  background: radial-gradient(circle at top right, var(--accent-subtle) 0%, transparent 70%);
  pointer-events: none;
}

.ai-card:hover {
  transform: translateY(-3px) !important;
  border-color: var(--border-accent);
  box-shadow: 0 8px 32px rgba(0, 102, 255, 0.06);
}

.ai-card-year {
  font-family: 'TelefonicaBold', Arial, Helvetica, sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
}

.ai-card h3 {
  font-weight: 700;
  margin-bottom: 6px;
  font-size: 0.95rem;
  color: var(--primary);
}

.ai-card p {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.ai-stack {
  text-align: center;
  padding-top: 8px;
}

.ai-stack h3 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 18px;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.stack-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.stack-tags span {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--text-secondary);
  transition: all 0.2s;
}

.stack-tags span:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}

/* ═══════════════ PITCH FOCUS ═══════════════ */
#pitch {
  background: var(--surface);
  background-image: radial-gradient(circle at 100% 100%, var(--accent-subtle) 0%, transparent 40%);
}

.pitch-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}

.pitch-card {
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  opacity: 0;
  transform: translateY(20px);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.pitch-card:hover {
  transform: translateY(-4px) !important;
  border-color: var(--border-accent);
  box-shadow: 0 12px 40px rgba(0, 102, 255, 0.08);
}

.pitch-number {
  font-family: 'TelefonicaBold', Arial, Helvetica, sans-serif;
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 12px;
  opacity: 0.3;
}

.pitch-card h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--primary);
}

.pitch-card p {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* ═══════════════ PHILOSOPHY ═══════════════ */
#philosophy {
  background: var(--background);
}

.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.quote-card {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  align-items: center;
  opacity: 0;
  transform: translateY(20px);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.quote-card:hover {
  transform: translateY(-3px) !important;
  border-color: var(--border-accent);
  box-shadow: 0 8px 32px rgba(0, 102, 255, 0.05);
}

.quote-card blockquote {
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.6;
  color: var(--text-primary);
  font-style: italic;
  border-left: 3px solid var(--accent);
  padding-left: 18px;
}

/* ═══════════════ CTA ═══════════════ */
#cta {
  background: var(--primary);
  background-image:
    radial-gradient(ellipse 80% 60% at 50% 100%, rgba(0, 102, 255, 0.18) 0%, transparent 60%);
  text-align: center;
  padding: 120px 0;
}

.cta-content {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.cta-logo {
  height: 36px;
  opacity: 0.5;
  margin-bottom: 40px;
}

.cta-title {
  font-size: clamp(2rem, 5.5vw, 3.6rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 40px;
  letter-spacing: -0.02em;
  color: #FFFFFF;
  opacity: 0;
}

.gradient-text {
  color: var(--accent-soft);
  -webkit-text-fill-color: var(--accent-soft);
  background: none;
  animation: none;
}

.cta-links {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
  justify-content: center;
  opacity: 0;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-family: 'TelefonicaBold', Arial, Helvetica, sans-serif;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}

.cta-btn:hover {
  transform: translateY(-2px);
}

.cta-btn.primary {
  background: var(--accent);
  color: #FFFFFF;
  box-shadow: 0 4px 24px rgba(0, 102, 255, 0.4);
}

.cta-btn.primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 8px 32px rgba(0, 102, 255, 0.5);
}

.cta-btn.secondary {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: #FFFFFF;
}

.cta-btn.secondary:hover {
  background: rgba(255, 255, 255, 0.13);
  border-color: rgba(255, 255, 255, 0.3);
}

.cta-note {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.38);
  opacity: 0;
}

/* ═══════════════ RESPONSIVE ═══════════════ */

@media (max-width: 1100px) {
  .pitch-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 1024px) {
  .challenge-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .numbers-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 28px 20px;
  }

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

  .pitch-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .section { padding: 72px 0; }

  .section-title {
    margin-bottom: 36px;
  }

  .ai-section-header {
    flex-direction: column;
  }

  .ai-hero-image {
    width: 100%;
    max-width: 320px;
  }

  .challenge-grid {
    grid-template-columns: 1fr;
  }

  .match-row {
    grid-template-columns: 1fr;
    gap: 4px;
    padding: 16px 22px;
  }

  .match-connector { display: none; }

  .match-need {
    font-size: 0.88rem;
    padding-bottom: 4px;
    border-bottom: 1px solid var(--border-accent);
  }

  .timeline-line { left: 18px; }

  .timeline-item.left,
  .timeline-item.right {
    padding-left: 44px;
    padding-right: 0;
    justify-content: flex-start;
  }

  .timeline-dot {
    left: 18px;
  }

  .timeline-item {
    margin-bottom: 20px;
  }

  .numbers-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .ai-grid {
    grid-template-columns: 1fr;
  }

  .philosophy-grid {
    grid-template-columns: 1fr;
  }

  .pitch-grid {
    grid-template-columns: 1fr 1fr;
  }

  #cta {
    padding: 80px 0;
  }

  .big-quote {
    font-size: 1.15rem;
  }

  .quote-banner {
    padding: 48px 0;
  }
}

@media (max-width: 480px) {
  .numbers-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .number {
    font-size: 2.2rem;
  }

  .match-row {
    padding: 14px 16px;
  }

  .timeline-card {
    padding: 16px;
  }

  .quote-card {
    padding: 22px;
  }

  .pitch-grid {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: 3rem;
  }

  .telefonica-logo {
    height: 28px;
  }
}