:root {
  --bg: #0f172a;
  --card: #1e293b;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --accent: #6366f1;
  --water: #38bdf8;
  --done: #22c55e;
  --missed: #f59e0b;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
  position: relative;
}

/* Language Picker */
.language-picker {
  position: absolute;
  top: 1.5rem;
  right: 2rem;
  z-index: 100;
}

#languageSelect {
  background-color: var(--card);
  color: var(--text);
  border: 1px solid #334155;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s;
}

#languageSelect:hover, #languageSelect:focus {
  border-color: var(--accent);
}

@media (max-width: 768px) {
  .language-picker {
    position: relative;
    top: 1rem;
    right: 0;
    text-align: center;
    margin-bottom: -3rem;
  }
}

/* Hero Section */
.hero {
  padding: 4rem 0 4rem;
  text-align: center;
}

.hero-logo-top {
  position: absolute;
  top: 1.5rem;
  left: 2rem;
  z-index: 100;
}

.brand-logo-top {
  width: 48px;
  height: auto;
  filter: drop-shadow(0 0 12px rgba(99, 102, 241, 0.3));
}

@media (max-width: 768px) {
  .hero-logo-top {
    position: relative;
    top: 0;
    left: 0;
    margin-bottom: 2rem;
    display: flex;
    justify-content: center;
  }
}

.hero h1 {
  font-size: 4rem;
  font-weight: 800;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--text) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-tagline {
  font-size: 1.8rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.75rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.hero-no-nonsense {
  font-size: 1.1rem;
  color: var(--muted);
  margin-bottom: 3rem;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero-no-nonsense span {
  opacity: 0.8;
}

.hero-no-nonsense .emphasis {
  color: var(--accent);
  font-weight: 700;
  opacity: 1;
}

.cta-group {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  padding: 1rem 2rem;
  border-radius: 12px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.2s, opacity 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background-color: var(--accent);
  color: #fff;
}

.btn-secondary {
  background-color: var(--card);
  color: var(--text);
  border: 1px solid #334155;
}

/* Showcase Grid */
.showcase-section {
  padding: 6rem 0;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-header h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.section-header p {
  color: var(--muted);
  font-size: 1.2rem;
}

.showcase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2.5rem;
}

/* Flip Cards */
.flip-card {
  background-color: transparent;
  width: 100%;
  height: 450px;
  perspective: 1000px;
  cursor: pointer;
}

.flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.8s;
  transform-style: preserve-3d;
}

.flip-card.flipped .flip-card-inner {
  transform: rotateY(180deg);
}

.flip-card-front, .flip-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  border-radius: 32px;
  overflow: hidden;
  border: 1px solid #334155;
  box-shadow: 0 20px 40px -10px rgba(0,0,0,0.3);
}

.flip-card-front {
  background-color: var(--card);
}

.flip-card-front img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.8;
  transition: transform 0.5s ease;
}

.flip-card:hover .flip-card-front img {
  transform: scale(1.05);
}

.card-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(15,23,42,0.9) 0%, transparent 100%);
  padding: 2rem;
  text-align: left;
}

.card-overlay h3 {
  font-size: 1.75rem;
  font-weight: 800;
  color: #fff;
}

.flip-card-back {
  background-color: var(--card);
  color: var(--text);
  transform: rotateY(180deg);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 2.5rem;
  border: 2px solid var(--accent);
}

.flip-card-back h3 {
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
  color: var(--accent);
}

.flip-card-back p {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--muted);
}

.tap-hint {
  position: absolute;
  bottom: 1.5rem;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent);
  opacity: 0.6;
}

/* Privacy Section */
.privacy {
  background-color: var(--card);
  padding: 4rem;
  border-radius: 32px;
  margin: 4rem 0;
  text-align: center;
  border: 1px solid #334155;
}

.privacy h2 {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
}

.privacy p {
  font-size: 1.25rem;
  color: var(--muted);
  max-width: 800px;
  margin: 0 auto;
}

/* App Mockup */
.mockup-container {
  margin-top: 4rem;
  perspective: 1500px;
}

.mockup {
  width: 280px;
  height: 580px;
  background-color: #000;
  border: 12px solid #334155;
  border-radius: 44px;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
  box-shadow: 0 50px 100px -20px rgba(0,0,0,0.6);
  transform: rotateX(5deg) rotateY(-5deg);
  transition: transform 0.5s ease;
}

.mockup:hover {
  transform: rotateX(0deg) rotateY(0deg) scale(1.02);
}

.mockup-inner {
  width: 100%;
  height: 100%;
  background-color: var(--bg);
}

.mockup-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Gallery Section - 3D Carousel */
.gallery-section {
  padding: 8rem 0;
  text-align: center;
  overflow: hidden;
  background: radial-gradient(circle at center, #1e293b 0%, var(--bg) 70%);
}

.gallery-section h2 {
  font-size: 3rem;
  margin-bottom: 4rem;
  letter-spacing: -1px;
}

.carousel-viewport {
  position: relative;
  width: 100%;
  height: 650px;
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 2000px;
}

.carousel-container {
  position: relative;
  width: 300px;
  height: 600px;
  transform-style: preserve-3d;
  transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.carousel-item {
  position: absolute;
  width: 100%;
  height: 100%;
  left: 0;
  top: 0;
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  user-select: none;
}

/* Realistic iPhone Frame for Carousel */
.iphone-frame {
  width: 100%;
  height: 100%;
  background: #000;
  border: 10px solid #334155;
  border-radius: 40px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 30px 60px -12px rgba(0,0,0,0.5), 
              0 18px 36px -18px rgba(0,0,0,0.5);
}

.iphone-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.iphone-notch {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  height: 25px;
  background: #334155;
  border-bottom-left-radius: 15px;
  border-bottom-right-radius: 15px;
  z-index: 10;
}

/* Carousel States */
.carousel-item.active {
  transform: translate3d(0, 0, 100px) rotateY(0deg) scale(1.1);
  z-index: 10;
  opacity: 1;
  box-shadow: 0 0 50px rgba(99, 102, 241, 0.3);
}

.carousel-item.prev {
  transform: translate3d(-350px, 0, -400px) rotateY(35deg);
  z-index: 5;
  opacity: 0.6;
}

.carousel-item.next {
  transform: translate3d(350px, 0, -400px) rotateY(-35deg);
  z-index: 5;
  opacity: 0.6;
}

.carousel-item.hidden-left {
  transform: translate3d(-700px, 0, -800px) rotateY(45deg);
  opacity: 0;
  z-index: 1;
}

.carousel-item.hidden-right {
  transform: translate3d(700px, 0, -800px) rotateY(-45deg);
  opacity: 0;
  z-index: 1;
}

/* Navigation Controls */
.carousel-nav {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 3rem;
}

.nav-btn {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: 1px solid #334155;
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  transition: all 0.3s ease;
}

.nav-btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  transform: scale(1.1);
}

/* Footer */
footer {
  padding: 4rem 0;
  text-align: center;
  border-top: 1px solid #334155;
  margin-top: 4rem;
}

footer p {
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-links {
  margin-top: 1rem;
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--accent);
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .hero p {
    font-size: 1.1rem;
  }
  
  .privacy {
    padding: 2rem;
  }
}