@font-face {
  font-family: "The Last Shuriken";
  src: url("../fonts/TheLastShuriken.ttf") format("truetype");
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}

:root,
[data-theme="light"] {
  --bg: #F5F0E8;
  --fg: #111111;
  --ink: #341c1c;
  --paper: #f5ece8;
  --accent: #ff5353;
  --accent-glow: #C41E3A;
  --item-bg: #FFFDF5;
  --muted: #888888;
  --halftone-opacity: 0.07;
  --screentone-opacity: 0.04;
  --ink-border-width: 3px;
  --gutter-color: #111111;
  --font-display: "The Last Shuriken", "Rampart One", "Darumadrop One", serif;
  --font-body: "Zen Kaku Gothic New", "Plus Jakarta Sans", "Noto Sans JP", sans-serif;
  color-scheme: light;
}

[data-theme="dark"] {
  --bg: #000000;
  --fg: #F0EDE6;
  --ink: #F0EDE6;
  --paper: #000000;
  --accent: #b30707;
  --accent-glow: #FFFFFF;
  --item-bg: #000000;
  --muted: #888888;
  --halftone-opacity: 0.05;
  --screentone-opacity: 0.03;
  --ink-border-width: 2px;
  --gutter-color: #F0EDE6;
  color-scheme: dark;
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  scroll-behavior: smooth;
  background-color: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  transition: background-color 0.4s ease, color 0.4s ease;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
  background-color: var(--bg);
}

::selection {
  background-color: var(--accent);
  color: #FFFFFF;
}

::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg);
}
::-webkit-scrollbar-thumb {
  background: var(--ink);
  border: 2px solid var(--bg);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

[data-theme="dark"] .show-light-only { display: none !important; }
[data-theme="light"] .show-dark-only { display: none !important; }

.ink-border {
  border: var(--ink-border-width) solid var(--ink);
  position: relative;
}

.halftone-overlay {
  position: relative;
}
.halftone-overlay::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background-image: radial-gradient(circle, var(--ink) 1px, transparent 1px);
  background-size: 8px 8px;
  opacity: var(--halftone-opacity);
}

.screentone {
  position: relative;
}
.screentone::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background-image: repeating-linear-gradient(
    45deg,
    var(--ink) 0px,
    var(--ink) 1px,
    transparent 1px,
    transparent 6px
  );
  opacity: var(--screentone-opacity);
}

.bg-items {
  position: relative;
  background: var(--item-bg);
  border: var(--ink-border-width) solid var(--ink);
  overflow: hidden;
}

.bg-items-gutter {
  box-shadow:
    4px 4px 0 0 var(--gutter-color),
    -1px -1px 0 0 var(--gutter-color);
}

.section {
  position: relative;
  background: transparent;
  border: 2px solid var(--ink);
  color: var(--fg);
  padding: 0.5rem 1.5rem;
  font-family: var(--font-display);
  font-size: 0.95rem;
  cursor: pointer;
  clip-path: polygon(8% 0%, 100% 0%, 92% 100%, 0% 100%);
  transition: background 0.2s ease, color 0.2s ease;
}
.section:hover {
  background: var(--ink);
  color: var(--bg);
}
.section-active {
  background: var(--accent);
  color: #FFFFFF;
  border-color: var(--accent);
}

.ink-button {
  display: inline-block;
  padding: 0.4rem 1rem;
  background: transparent;
  border: 2px solid var(--ink);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  position: relative;
}
.ink-button:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translate(-2px, -2px);
}

.ink-ring {
  border: 3px solid var(--ink);
  border-radius: 50%;
  padding: 3px;
}

@keyframes ink-wobble {
  0%   { clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 0% 100%); }
  25%  { clip-path: polygon(0.5% 0.3%, 99.5% 0.5%, 100% 99.5%, 0.3% 100%); }
  50%  { clip-path: polygon(0% 0.5%, 100% 0%, 99.5% 100%, 0.5% 99.5%); }
  75%  { clip-path: polygon(0.3% 0%, 100% 0.3%, 99.8% 99.8%, 0% 100%); }
  100% { clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 0% 100%); }
}

.hover-ink-wobble:hover {
  animation: ink-wobble 0.4s ease-in-out;
}

@keyframes float-idle {
  0%, 100% { transform: translateY(0px); }
  50%      { transform: translateY(-8px); }
}

.float-idle {
  animation: float-idle 3s ease-in-out infinite;
}

@keyframes item-pop {
  0%   { transform: translate(0, 0); box-shadow: 4px 4px 0 0 var(--gutter-color); }
  50%  { transform: translate(-3px, -3px); box-shadow: 7px 7px 0 0 var(--gutter-color); }
  100% { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 0 var(--gutter-color); }
}

.hover-item-pop {
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.hover-item-pop:hover {
  animation: item-pop 0.25s forwards;
}

.nav-container {
  position: fixed;
  bottom: 24px;
  left: 0;
  right: 0;
  z-index: 90;
  display: flex;
  justify-content: center;
  transition: transform 0.4s ease, opacity 0.4s ease;
}
.nav-container.hidden {
  transform: translateY(80px);
  opacity: 0;
  pointer-events: none;
}

.navbar {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 12px;
  border-radius: 24px;
  background-color: var(--item-bg);
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
  opacity: 0.9;
  transition: background-color 0.4s ease, border-color 0.4s ease;
}

.nav-btn {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  border: none;
  background: transparent;
  color: var(--fg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}
.nav-btn:hover {
  transform: scale(1.1);
}
.nav-btn:active {
  transform: scale(0.9);
}
.nav-btn.active {
  background: var(--accent);
  color: #FFFFFF;
}

.nav-divider {
  width: 2px;
  height: 24px;
  background: var(--ink);
  margin: 0 4px;
  opacity: 0.3;
}