/* ============================================================
   Variables
============================================================ */
:root {
  --bg:          #F5F3EE;
  --bg-alt:      #EDEAE3;
  --text:        #151210;
  --text-muted:  #7A7570;
  --text-inv:    #F5F3EE;
  --accent:      #2B5CE6;
  --accent-alt:  #E63E2B;
  --border:      rgba(21, 18, 16, 0.12);

  --font-head: 'DM Serif Display', serif;
  --font-ui:   'Syne', sans-serif;
  --font-body: 'Noto Sans JP', sans-serif;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ============================================================
   Reset & Base
============================================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.7;
  overflow-x: hidden;
  cursor: none;
}

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

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

ul {
  list-style: none;
}

/* ============================================================
   Noise Overlay
============================================================ */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9000;
  opacity: 0.5;
}

/* ============================================================
   Custom Cursor
============================================================ */
.js-cursor__dot {
  position: fixed;
  top: 0;
  left: 0;
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 9999;
  transition: width 0.3s, height 0.3s, background 0.3s;
}

.js-cursor__ring {
  position: fixed;
  top: 0;
  left: 0;
  width: 40px;
  height: 40px;
  border: 1.5px solid var(--text);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 9998;
  opacity: 0.3;
  transition: width 0.4s, height 0.4s, opacity 0.3s;
}

/* ============================================================
   Header
============================================================ */
.l-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding-block: 1.5rem;
  padding-inline: 3rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.p-header__logo {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text);
}

.p-header__nav {
  display: flex;
  gap: 2.5rem;
}

.p-header__nav a {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text);
  position: relative;
  padding-bottom: 2px;
}

.p-header__nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width 0.4s var(--ease-out);
}

@media (hover: hover) {
  .p-header__nav a:hover::after {
    width: 100%;
  }
}

.p-header__cta {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-inv);
  background: var(--text);
  padding-block: 0.6rem;
  padding-inline: 1.4rem;
  transition: background 0.3s;
}

@media (hover: hover) {
  .p-header__cta:hover {
    background: var(--accent);
  }
}

/* ============================================================
   Footer
============================================================ */
.l-footer {
  padding-block: 2.5rem;
  padding-inline: 3rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border);
}

.p-footer__copy {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.p-footer__links {
  display: flex;
  gap: 2rem;
}

.p-footer__links a {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color 0.3s;
}

@media (hover: hover) {
  .p-footer__links a:hover {
    color: var(--accent);
  }
}

/* ============================================================
   Button Component
============================================================ */
.c-btn {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  background: var(--text);
  color: var(--bg);
  padding-block: 1.2rem;
  padding-inline: 2.5rem;
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: background 0.3s, transform 0.3s var(--ease-out);
}

@media (hover: hover) {
  .c-btn:hover {
    background: var(--accent);
    transform: translateY(-3px);
  }
}

/* ============================================================
   Utility: Fade In (Intersection Observer)
============================================================ */
.u-fadeIn {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

.u-fadeIn.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.u-fadeIn--d1 { transition-delay: 0.1s; }
.u-fadeIn--d2 { transition-delay: 0.2s; }
.u-fadeIn--d3 { transition-delay: 0.3s; }
.u-fadeIn--d4 { transition-delay: 0.4s; }

/* ============================================================
   Responsive: SP
============================================================ */
@media screen and (max-width: 767px) {
  .l-header {
    padding-inline: 1.5rem;
  }

  .p-header__nav,
  .p-header__cta {
    display: none;
  }

  .l-footer {
    flex-direction: column;
    gap: 1.5rem;
    padding-inline: 1.5rem;
  }
}