/* Sprinkle Inc. — Global styles */

:root {
  --color-black:   #0A0A0A;
  --color-white:   #FAFAFA;
  --color-gray-1:  #F2F2F0;
  --color-gray-2:  #E0E0DC;
  --color-gray-3:  #A0A09A;
  --color-gray-4:  #5A5A55;
  --color-blue:    #004D6D;
  --color-blue-lt: #EFF6FF;

  --accent: var(--color-blue);
  --accent-lt: var(--color-blue-lt);

  --font-en: "DM Sans", "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-jp: "Noto Sans JP", "DM Sans", -apple-system, BlinkMacSystemFont, sans-serif;

  --pad-x: clamp(24px, 6vw, 96px);
  --pad-section: clamp(96px, 14vw, 200px);
  --max-w: 1440px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font-jp);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  color: var(--color-black);
  background: var(--color-white);
  text-rendering: optimizeLegibility;
}

/* -------- Type -------- */
.en { font-family: var(--font-en); letter-spacing: -0.02em; }
.jp { font-family: var(--font-jp); }

h1, h2, h3, h4 {
  font-family: var(--font-en);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.05;
  margin: 0;
  text-wrap: balance;
}

p { margin: 0; text-wrap: pretty; }

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

/* Links with sliding underline */
.hero-headline__dot {
  color: #004D6D;
  font-size: 1.5em;
  line-height: 0;
  vertical-align: -0.06em;
}
.link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  position: relative;
  padding-bottom: 2px;
  font-family: var(--font-en);
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0;
  color: var(--color-black);
  cursor: pointer;
}
.link::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 1px;
  background: currentColor;
  transform-origin: right center;
  transform: scaleX(0);
  transition: transform .5s cubic-bezier(.7,0,.2,1);
}
.link:hover::after { transform-origin: left center; transform: scaleX(1); }
.link .arrow { display: inline-block; transition: transform .4s cubic-bezier(.7,0,.2,1); }
.link:hover .arrow { transform: translateX(4px); }

/* -------- Layout helpers -------- */
.shell {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
}

.section {
  padding-top: var(--pad-section);
  padding-bottom: var(--pad-section);
  position: relative;
}
.section + .section { padding-top: 0; }

.section-divider {
  border: 0;
  border-top: 1px solid var(--color-gray-2);
  margin: 0;
}

.section-label {
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-gray-4);
  display: inline-block;
  margin-bottom: 32px;
}

.section-label::before {
  content: "";
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 10px;
  transform: translateY(-2px);
}

.section-title {
  font-size: clamp(32px, 4.5vw, 56px);
  font-weight: 400;
  letter-spacing: -0.025em;
  line-height: 1.1;
  margin-bottom: 48px;
  font-family: var(--font-jp);
}

.section-title .en {
  font-family: var(--font-en);
  font-weight: 500;
}

.section-title--stack {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: clamp(10px, 2vw, 16px);
  margin-bottom: 48px;
}

.section-title--stack .section-title__main {
  font-family: var(--font-en);
  font-size: clamp(32px, 4.5vw, 56px);
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--color-black);
}

.section-title--stack .section-title__sub {
  font-family: var(--font-jp);
  font-size: clamp(13px, 1.6vw, 15px);
  font-weight: 400;
  letter-spacing: 0.12em;
  line-height: 1.6;
  color: var(--color-gray-4);
}

.section-title--stack .section-title__sub::before {
  content: "（";
}

.section-title--stack .section-title__sub::after {
  content: "）";
}

/* -------- Navigation -------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 24px var(--pad-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: transparent;
  transition: background .3s ease, backdrop-filter .3s ease, border-color .3s ease, padding .3s ease;
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: rgba(250, 250, 250, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--color-gray-2);
  padding-top: 16px;
  padding-bottom: 16px;
}
.nav-logo {
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.03em;
  color: var(--color-black);
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
}
.nav-logo::after {
  content: "";
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  transform: translateY(-1px);
}
.nav-links {
  display: flex;
  gap: 36px;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-en);
  font-size: 14px;
  font-weight: 500;
}
.nav-links a {
  position: relative;
  padding-bottom: 4px;
  color: var(--color-black);
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform .4s cubic-bezier(.7,0,.2,1);
}
.nav-links a:hover::after,
.nav-links a.is-active::after { transform: scaleX(1); transform-origin: left center; }

.nav-burger {
  display: none;
  width: 40px; height: 40px;
  background: transparent;
  border: 0;
  cursor: pointer;
  padding: 0;
  position: relative;
}
.nav-burger span {
  position: absolute;
  left: 8px; right: 8px;
  height: 1.5px;
  background: var(--color-black);
  transition: transform .3s, top .3s, opacity .2s;
}
.nav-burger span:nth-child(1) { top: 14px; }
.nav-burger span:nth-child(2) { top: 24px; }
.nav-burger.is-open span:nth-child(1) { top: 19px; transform: rotate(45deg); }
.nav-burger.is-open span:nth-child(2) { top: 19px; transform: rotate(-45deg); opacity: 1; }

.nav-mobile {
  position: fixed;
  inset: 0;
  background: var(--color-white);
  z-index: 99;
  padding: 96px var(--pad-x) 48px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s;
}
.nav-mobile.is-open { opacity: 1; pointer-events: auto; }
.nav-mobile a {
  font-family: var(--font-en);
  font-size: 32px;
  font-weight: 400;
  letter-spacing: -0.02em;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-gray-2);
  color: var(--color-black);
}
.nav-mobile a small {
  display: block;
  font-family: var(--font-jp);
  font-size: 12px;
  font-weight: 400;
  color: var(--color-gray-4);
  margin-top: 4px;
}

/* -------- Footer -------- */
.footer {
  border-top: 1px solid var(--color-gray-2);
  padding: 96px var(--pad-x) 48px;
  background: var(--color-white);
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.footer-brand {
  font-family: var(--font-en);
  font-weight: 700;
  font-size: clamp(48px, 9vw, 120px);
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--color-black);
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.footer-brand::after {
  content: "";
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent);
}
.footer-tag {
  font-family: var(--font-jp);
  font-size: 14px;
  color: var(--color-gray-4);
  margin-top: 24px;
  margin-bottom: 64px;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-en);
  font-size: 14px;
  font-weight: 500;
  border-top: 1px solid var(--color-gray-2);
  padding-top: 32px;
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  margin-top: 48px;
  font-size: 12px;
  color: var(--color-gray-4);
  font-family: var(--font-en);
  flex-wrap: wrap;
  gap: 8px;
}

/* -------- Animations -------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .9s cubic-bezier(.2,.7,.2,1), transform .9s cubic-bezier(.2,.7,.2,1);
  transition-delay: var(--reveal-delay, 0s);
}
.reveal.is-in {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .reveal { transition: none !important; opacity: 1 !important; transform: none !important; }
}

/* -------- Buttons -------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 18px 32px;
  border: 1px solid var(--color-black);
  border-radius: 999px;
  background: transparent;
  color: var(--color-black);
  font-family: var(--font-en);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0;
  cursor: pointer;
  transition: background .3s, color .3s, transform .3s;
  text-decoration: none;
}
.btn .arrow { transition: transform .4s cubic-bezier(.7,0,.2,1); }
.btn:hover { background: var(--color-black); color: var(--color-white); }
.btn:hover .arrow { transform: translateX(4px); }

.btn-blue {
  border-color: var(--accent);
  color: var(--accent);
}
.btn-blue:hover { background: var(--accent); color: var(--color-white); }

/* -------- Tweaks panel hook -------- */
[data-accent="mono"] { --accent: #0A0A0A; --accent-lt: #F2F2F0; }
[data-accent="blue"] { --accent: #2563EB; --accent-lt: #EFF6FF; }
[data-accent="warm"] { --accent: #B7410E; --accent-lt: #FBF1EC; }

/* -------- Responsive -------- */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-burger { display: block; }
  body { font-size: 15px; }
}