/* ========================================
   YUNTERA. — Styles
   ======================================== */

:root {
  --yellow: #FFD54F;
  --yellow-dark: #FFC107;
  --yellow-light: #FFECB3;
  --black: #0A0A0A;
  --black-soft: #141414;
  --white: #FAFAFA;
  --gray: #1E1E1E;
  --gray-light: #2A2A2A;
  --red: #E53935;
  --text-primary: #FAFAFA;
  --text-secondary: #999;
  --font-display: 'Syne', sans-serif;
  --font-body: 'Space Grotesk', sans-serif;
}

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

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

body {
  font-family: var(--font-body);
  background: var(--black);
  color: var(--text-primary);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

.dot-yellow {
  color: var(--yellow);
}

/* ========== Loader ========== */
.loader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--yellow);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.8s cubic-bezier(0.76, 0, 0.24, 1);
}

.loader.done {
  transform: translateY(-100%);
  pointer-events: none;
}

.loader-text {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 6vw, 4rem);
  color: var(--black);
  letter-spacing: -0.02em;
}

.loader-dot {
  color: var(--black);
}

/* ========== Navigation ========== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 3rem;
  mix-blend-mode: difference;
}

.nav-logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--white);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
}

.nav-links a {
  color: var(--white);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color 0.3s;
}

.nav-links a:hover {
  color: var(--yellow);
}

/* ========== Hero ========== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 6rem 3rem;
}

.hero-lines {
  position: absolute;
  inset: 0;
  opacity: 0.15;
  pointer-events: none;
}

.hero-lines svg {
  width: 100%;
  height: 100%;
}

.red-line {
  stroke: var(--red);
  stroke-width: 1.5;
  stroke-dasharray: 1200;
  stroke-dashoffset: 1200;
  animation: drawLine 2s ease-out forwards;
}

.line-1 { animation-delay: 0.5s; }
.line-2 { animation-delay: 0.8s; }
.line-3 { animation-delay: 1.1s; }
.line-4 { animation-delay: 1.4s; }

@keyframes drawLine {
  to { stroke-dashoffset: 0; }
}

.hero-content {
  flex: 1;
  max-width: 600px;
  z-index: 2;
}

.hero-badge {
  display: inline-block;
  padding: 0.4rem 1rem;
  border: 1px solid var(--yellow);
  color: var(--yellow);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 2rem;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease-out 1.8s forwards;
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.hero-line-1 {
  display: block;
  font-size: clamp(2.5rem, 6vw, 5rem);
  color: var(--text-primary);
  opacity: 0;
  transform: translateY(40px);
  animation: fadeUp 0.8s ease-out 2s forwards;
}

.hero-line-2 {
  display: block;
  font-size: clamp(3rem, 8vw, 7rem);
  color: var(--yellow);
  opacity: 0;
  transform: translateY(40px);
  animation: fadeUp 0.8s ease-out 2.2s forwards;
}

.hero-sub {
  margin-top: 1.5rem;
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 440px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease-out 2.4s forwards;
}

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Hero Phone */
.hero-phone {
  position: absolute;
  right: 8%;
  top: 50%;
  transform: translateY(-50%);
  width: clamp(260px, 22vw, 380px);
  z-index: 1;
  opacity: 0;
  animation: phoneReveal 1.2s ease-out 2.6s forwards;
}

@keyframes phoneReveal {
  from {
    opacity: 0;
    transform: translateY(-50%) translateY(60px) rotateY(-15deg);
  }
  to {
    opacity: 1;
    transform: translateY(-50%) translateY(0) rotateY(0);
  }
}

.phone-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 120%;
  height: 120%;
  background: radial-gradient(circle, rgba(255, 213, 79, 0.15) 0%, transparent 70%);
  pointer-events: none;
  animation: glowPulse 4s ease-in-out infinite;
}

@keyframes glowPulse {
  0%, 100% { opacity: 0.5; transform: translate(-50%, -50%) scale(1); }
  50% { opacity: 1; transform: translate(-50%, -50%) scale(1.1); }
}

.phone-img {
  width: 100%;
  display: block;
  border-radius: 20px;
  position: relative;
}

.phone-front {
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  transition: opacity 0.6s ease, transform 0.6s ease;
  transform: scale(0.95);
}

.hero-phone:hover .phone-front {
  opacity: 1;
  transform: scale(1);
}

.hero-phone:hover .phone-back {
  opacity: 0;
  transform: scale(1.05);
}

.phone-back {
  transition: opacity 0.6s ease, transform 0.6s ease;
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 3rem;
  left: 3rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  opacity: 0;
  animation: fadeUp 0.6s ease-out 3s forwards;
}

.scroll-indicator span {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-secondary);
}

.scroll-line {
  width: 60px;
  height: 1px;
  background: var(--gray-light);
  position: relative;
  overflow: hidden;
}

.scroll-line::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--yellow);
  animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
  0% { left: -100%; }
  100% { left: 100%; }
}

/* ========== Section Label ========== */
.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--yellow);
  margin-bottom: 3rem;
}

/* ========== Concept ========== */
.concept {
  padding: 8rem 3rem;
  background: var(--black);
  position: relative;
}

.concept-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.concept-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: center;
}

.concept-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 4vw, 3.5rem);
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.concept-tag {
  display: inline-block;
  margin-left: 0.75rem;
  padding: 0.2rem 0.6rem;
  background: var(--gray-light);
  border-radius: 4px;
  font-size: 0.6rem;
  font-family: var(--font-body);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  vertical-align: middle;
  color: var(--text-secondary);
}

.concept-desc {
  margin-top: 1.5rem;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.concept-specs {
  margin-top: 3rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.spec {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1rem;
  background: var(--gray);
  border-radius: 8px;
  border: 1px solid var(--gray-light);
}

.spec-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--yellow);
  font-weight: 600;
}

.spec-value {
  font-size: 0.95rem;
  color: var(--text-primary);
  font-weight: 500;
}

/* Concept Visual */
.concept-visual {
  display: flex;
  justify-content: center;
}

.phone-showcase {
  position: relative;
  width: 300px;
  height: 400px;
}

.showcase-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--yellow);
  opacity: 0.2;
}

.ring-1 {
  width: 110%;
  height: 110%;
  top: -5%;
  left: -5%;
  animation: rotateRing 20s linear infinite;
}

.ring-2 {
  width: 130%;
  height: 130%;
  top: -15%;
  left: -15%;
  animation: rotateRing 30s linear infinite reverse;
  opacity: 0.1;
}

@keyframes rotateRing {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.showcase-phone {
  width: 100%;
  height: 100%;
  object-fit: contain;
  position: relative;
  z-index: 2;
  filter: drop-shadow(0 20px 60px rgba(255, 213, 79, 0.2));
  animation: floatPhone 6s ease-in-out infinite;
}

@keyframes floatPhone {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
}

/* ========== Philosophy ========== */
.philosophy {
  padding: 8rem 3rem;
  background: var(--black-soft);
}

.philosophy-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.phil-card {
  padding: 2.5rem;
  background: var(--gray);
  border-radius: 12px;
  border: 1px solid var(--gray-light);
  transition: border-color 0.4s, transform 0.4s;
  opacity: 0;
  transform: translateY(40px);
}

.phil-card.revealed {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out, border-color 0.4s;
}

.phil-card:hover {
  border-color: var(--yellow);
  transform: translateY(-4px);
}

.phil-icon {
  width: 48px;
  height: 48px;
  color: var(--yellow);
  margin-bottom: 1.5rem;
}

.phil-card h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

.phil-card p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* ========== Collaborators ========== */
.collaborators {
  padding: 8rem 3rem;
  background: var(--black);
}

.collab-inner {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.collab-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.03em;
}

.collab-sub {
  margin-top: 1rem;
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.collab-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 3rem;
  text-align: left;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.collab-card {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1.5rem 2rem;
  background: var(--gray);
  border-radius: 12px;
  border: 1px solid var(--gray-light);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.4s, transform 0.3s;
  opacity: 0;
  transform: translateY(30px);
}

.collab-card.revealed {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out, border-color 0.4s;
}

.collab-card:hover {
  border-color: var(--yellow);
  transform: translateY(-2px);
}

.collab-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--yellow);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.collab-initial {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.4rem;
  color: var(--black);
}

.collab-info p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.15rem;
}

.collab-link {
  margin-left: auto;
  color: var(--text-secondary);
  transition: color 0.3s;
}

.collab-link svg {
  width: 20px;
  height: 20px;
}

.collab-card:hover .collab-link {
  color: var(--yellow);
}

/* ========== Footer ========== */
.footer {
  padding: 4rem 3rem 2rem;
  background: var(--black-soft);
  border-top: 1px solid var(--gray-light);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 3rem;
}

.footer-credits p {
  text-align: right;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer-credits strong {
  color: var(--yellow);
  font-weight: 600;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding-top: 2rem;
  border-top: 1px solid var(--gray-light);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.footer-dot {
  color: var(--yellow);
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .hero {
    flex-direction: column;
    justify-content: center;
    text-align: center;
    padding-top: 8rem;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-sub {
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
  }

  .hero-badge {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-phone {
    position: relative;
    right: auto;
    top: auto;
    transform: none;
    margin: 3rem auto 0;
    width: 220px;
  }

  @keyframes phoneReveal {
    from {
      opacity: 0;
      transform: translateY(60px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .scroll-indicator {
    left: 50%;
    transform: translateX(-50%);
  }

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

  .philosophy-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .nav {
    padding: 1.25rem 1.5rem;
  }

  .nav-links {
    gap: 1.5rem;
  }
}

@media (max-width: 640px) {
  .hero {
    padding: 6rem 1.5rem 4rem;
  }

  .concept, .philosophy, .collaborators {
    padding: 5rem 1.5rem;
  }

  .footer {
    padding: 3rem 1.5rem 1.5rem;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 0.5rem;
  }

  .footer-top {
    text-align: center;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 0.5rem;
  }

  .footer-dot {
    display: none;
  }

  .nav-links {
    display: none;
  }

  .concept-specs {
    grid-template-columns: 1fr;
  }
}

/* ========== Reduced Motion ========== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .loader {
    display: none;
  }

  .hero-badge,
  .hero-line-1,
  .hero-line-2,
  .hero-sub,
  .hero-phone,
  .scroll-indicator,
  .phil-card,
  .collab-card {
    opacity: 1;
    transform: none;
  }

  .red-line {
    stroke-dashoffset: 0;
  }
}