/* ============================================
   Bartlett Butter — Style
   Design System: Showcasy by Pixeflow (adapted)
   ============================================ */

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

:root {
  /* Neutral Palette (Showcasy) */
  --neutral-0: #FFFFFF;
  --neutral-10: #F9FAFB;
  --neutral-20: #E5E7EB;
  --neutral-30: #D1D5DB;
  --neutral-40: #AEB2BA;
  --neutral-50: #6B7280;
  --neutral-60: #4B5563;
  --neutral-70: #374151;
  --neutral-80: #1F2937;
  --neutral-90: #111827;
  --neutral-100: #030712;

  /* Semantic tokens */
  --color-bg: var(--neutral-0);
  --color-bg-subtle: var(--neutral-10);
  --color-text: var(--neutral-80);
  --color-text-muted: var(--neutral-50);
  --color-text-strong: var(--neutral-100);
  --color-border: var(--neutral-20);
  --color-panel-bg: var(--neutral-90);
  --color-panel-text: var(--neutral-0);

  /* Typography */
  --font: 'Inter Tight', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing scale */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 40px;
  --space-8: 48px;
  --space-9: 56px;
  --space-10: 64px;
  --space-11: 72px;
  --space-12: 80px;

  /* Transitions */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0.0, 0, 0.2, 1);
  --duration-fast: 200ms;
  --duration-normal: 400ms;
  --duration-slow: 600ms;

  /* Layout */
  --max-width: 1200px;
  --section-padding: var(--space-12);
  --section-padding-mobile: var(--space-8);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  font-size: 18px;
  line-height: 1.6;
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

ul { list-style: none; }

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

/* ─── Navigation ─── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-7);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.nav-logo img {
  width: 44px;
  height: 44px;
  border-radius: 10px;
}

.nav-logo span {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text-strong);
  letter-spacing: -0.02em;
}

.brand-text {
  font-size: 18px;
  font-weight: 300;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-strong);
}

.brand-text strong {
  font-weight: 700;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--duration-fast) ease;
}

.nav-link:hover {
  color: var(--color-text-strong);
}

.nav-link--cta {
  background: var(--neutral-90);
  color: var(--neutral-0);
  padding: 10px 20px;
  border-radius: 100px;
  font-size: 15px;
  font-weight: 500;
  transition: opacity var(--duration-fast) ease;
}

.nav-link--cta:hover {
  opacity: 0.85;
  color: var(--neutral-0);
}

/* ─── Hero Section ─── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--space-12) + 60px) var(--space-7) var(--space-12);
}

.hero-content {
  max-width: 800px;
}

.hero-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
  animation: fadeUp 0.8s var(--ease-out) both;
}

.hero-logo {
  position: relative;
  width: 220px;
  height: 220px;
  margin: 0 auto var(--space-7);
  border-radius: 48px;
  overflow: visible;
  animation: logoEntrance 1s var(--ease-out) both;
  animation-delay: 200ms;
}

.hero-logo img {
  position: relative;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 48px;
  filter: brightness(1.3) contrast(1.2);
  box-shadow:
    0 4px 12px rgba(0, 0, 0, 0.05),
    0 16px 48px rgba(0, 0, 0, 0.08),
    0 32px 80px rgba(0, 0, 0, 0.04);
  transition: transform var(--duration-normal) var(--ease), box-shadow var(--duration-normal) var(--ease);
}

.hero-logo:hover img {
  transform: scale(1.03) translateY(-2px);
  box-shadow:
    0 6px 16px rgba(0, 0, 0, 0.06),
    0 24px 56px rgba(0, 0, 0, 0.1),
    0 40px 96px rgba(0, 0, 0, 0.05);
}

.hero-logo-glow {
  position: absolute;
  inset: -24px;
  border-radius: 60px;
  background: radial-gradient(
    circle at center,
    rgba(107, 114, 128, 0.06) 0%,
    rgba(107, 114, 128, 0.02) 50%,
    transparent 70%
  );
  filter: blur(8px);
  z-index: -1;
  animation: glowPulse 4s ease-in-out infinite;
}

@keyframes logoEntrance {
  from {
    opacity: 0;
    transform: scale(0.9) translateY(12px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

@keyframes glowPulse {
  0%, 100% {
    opacity: 0.6;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.05);
  }
}

.hero-title {
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--color-text-strong);
  margin-bottom: var(--space-5);
  animation: fadeUp 0.8s var(--ease-out) both;
  animation-delay: 400ms;
}

.hero-subtitle {
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto var(--space-7);
  animation: fadeUp 0.8s var(--ease-out) both;
  animation-delay: 550ms;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--neutral-90);
  color: var(--neutral-0);
  padding: 14px 28px;
  border-radius: 100px;
  font-size: 16px;
  font-weight: 500;
  transition: opacity var(--duration-fast) ease, transform var(--duration-fast) ease;
  animation: fadeUp 0.8s var(--ease-out) both;
  animation-delay: 700ms;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-cta:hover {
  opacity: 0.85;
  transform: translateY(-1px);
  color: var(--neutral-0);
}

.hero-cta svg {
  width: 16px;
  height: 16px;
  transition: transform var(--duration-fast) ease;
}

.hero-cta:hover svg {
  transform: translateX(3px);
}

/* ─── Section Common ─── */
.section {
  padding: var(--section-padding) var(--space-7);
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--neutral-60);
  margin-bottom: var(--space-5);
}

.section-title {
  font-size: clamp(32px, 4vw, 56px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-text-strong);
  margin-bottom: var(--space-7);
}

/* ─── Works Section ─── */
.works {
  background: var(--color-bg-subtle);
}

.works-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-5);
}

.work-card {
  background: var(--color-bg);
  border-radius: 16px;
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  transition: transform var(--duration-fast) ease, box-shadow var(--duration-fast) ease;
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.work-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.work-card-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  overflow: hidden;
  flex-shrink: 0;
}

.work-card-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.work-card-body {
  min-width: 0;
  flex: 1;
}

.work-card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text-strong);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-1);
}

.work-card-desc {
  font-size: 15px;
  line-height: 1.55;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.work-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.work-card-tag {
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--neutral-60);
  background: var(--neutral-20);
  padding: 4px 10px;
  border-radius: 6px;
}

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

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-10);
  align-items: start;
}

.about-intro {
  position: sticky;
  top: 120px;
}

.about-intro-text {
  font-size: 22px;
  line-height: 1.6;
  color: var(--color-text);
  margin-bottom: var(--space-6);
}

.about-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.about-block-title {
  font-size: 13px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.about-block-content {
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
}

.about-block-content p {
  margin-bottom: var(--space-4);
}

.about-block-content p:last-child {
  margin-bottom: 0;
}

.about-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.about-list li {
  font-size: 14px;
  font-weight: 500;
  color: var(--neutral-60);
  background: var(--neutral-20);
  padding: 8px 16px;
  border-radius: 100px;
  border: 1px solid var(--neutral-30);
}

/* ─── How We Build Section ─── */
.how-we-build {
  background: var(--neutral-90);
  color: var(--neutral-0);
}

.how-we-build .section-label {
  color: rgba(255, 255, 255, 0.4);
}

.how-we-build .section-title {
  color: var(--neutral-0);
}

.build-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.build-item {
  padding: var(--space-6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  transition: border-color var(--duration-fast) ease;
}

.build-item:hover {
  border-color: rgba(255, 255, 255, 0.2);
}

.build-number {
  font-size: 13px;
  font-weight: 600;
  opacity: 0.3;
  margin-bottom: var(--space-4);
  font-variant-numeric: tabular-nums;
}

.build-item-title {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-3);
  opacity: 0.95;
}

.build-item-desc {
  font-size: 16px;
  line-height: 1.7;
  opacity: 0.6;
}

/* ─── Contact Section ─── */
.contact {
  background: var(--color-bg-subtle);
  text-align: center;
}

.contact-inner {
  max-width: 600px;
}

.contact .section-title {
  white-space: nowrap;
}

.contact-text {
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

.contact-email {
  display: inline-block;
  font-size: 20px;
  font-weight: 600;
  color: var(--neutral-60);
  padding: 14px 32px;
  background: var(--neutral-20);
  border: 1.5px solid var(--neutral-30);
  border-radius: 100px;
  transition: background var(--duration-fast) ease, border-color var(--duration-fast) ease, color var(--duration-fast) ease;
}

.contact-email:hover {
  background: var(--neutral-90);
  border-color: var(--neutral-90);
  color: var(--neutral-0);
}

/* ─── Footer ─── */
.footer {
  background: var(--neutral-100);
  color: var(--neutral-0);
  padding: var(--space-10) var(--space-7) var(--space-6);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-10);
  gap: var(--space-7);
}

.footer-brand {
  max-width: 360px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.footer-logo img {
  width: 44px;
  height: 44px;
  border-radius: 10px;
}

.footer-logo span {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.footer-logo .brand-text {
  font-size: 18px;
  font-weight: 300;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--neutral-0);
}

.footer-logo .brand-text strong {
  font-weight: 700;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  opacity: 0.5;
}

.footer-contact {
  text-align: right;
}

.footer-contact-label {
  font-size: 13px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  opacity: 0.4;
  margin-bottom: var(--space-3);
}

.footer-contact-email {
  font-size: 16px;
  font-weight: 500;
  opacity: 0.85;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: opacity var(--duration-fast) ease;
}

.footer-contact-email:hover {
  opacity: 1;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-copy {
  font-size: 13px;
  opacity: 0.35;
}

.footer-links {
  display: flex;
  gap: var(--space-5);
}

.footer-link {
  font-size: 13px;
  opacity: 0.5;
  transition: opacity var(--duration-fast) ease;
}

.footer-link:hover {
  opacity: 1;
}

/* ─── Scroll Animations ─── */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-slow) var(--ease), transform var(--duration-slow) var(--ease);
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── Responsive ─── */
@media (max-width: 1024px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .about-intro {
    position: static;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: var(--space-9);
  }

  .nav {
    padding: var(--space-4) var(--space-5);
  }

  .nav-logo .brand-text {
    font-size: 15px;
  }

  .nav-links {
    gap: var(--space-4);
  }

  .nav-link {
    font-size: 14px;
  }

  .nav-link--cta {
    padding: 8px 16px;
    font-size: 14px;
  }

  .hero {
    padding: calc(var(--space-12) + 40px) var(--space-5) var(--space-10);
  }

  .hero-logo {
    width: 160px;
    height: 160px;
    border-radius: 36px;
  }

  .hero-logo img {
    border-radius: 36px;
  }

  .hero-logo-glow {
    inset: -16px;
    border-radius: 48px;
  }

  .hero-subtitle {
    font-size: 17px;
  }

  .section {
    padding: var(--section-padding) var(--space-5);
  }

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

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

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

  .footer-top {
    flex-direction: column;
    gap: var(--space-6);
  }

  .footer-contact {
    text-align: left;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 36px;
  }

  .section-title {
    font-size: 28px;
  }

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

  .work-card {
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
  }
}

/* ─── Accessibility ─── */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--neutral-90);
  outline-offset: 3px;
  border-radius: 4px;
}

.nav-link--cta:focus-visible,
.hero-cta:focus-visible,
.contact-email:focus-visible {
  outline-color: var(--neutral-60);
  outline-offset: 4px;
}

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

  .fade-in {
    opacity: 1;
    transform: none;
  }

  html {
    scroll-behavior: auto;
  }
}