/* ============================================================
   style.css — kanba.pw · Global Styles
   ============================================================ */

/* ── Google Fonts ─────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=DM+Sans:wght@300;400;500;600&display=swap');

/* ── CSS Variables ────────────────────────────────────────── */
:root {
  /* colors - dark (default) */
  --bg:         #0a0a12;
  --surface:    #111120;
  --surface2:   #181828;
  --border:     #1e1e34;
  --border2:    #2a2a44;
  --accent:     #f7931a;
  --accent2:    #00d4aa;
  --text:       #e8e8f4;
  --text-muted: #8888aa;
  --text-dim:   #5555770;
  --nav-h:      60px;
  --radius:     14px;
  --radius-sm:  8px;
  --shadow:     0 4px 24px rgba(0,0,0,.45);
  --font-d:     'Syne', sans-serif;
  --font-b:     'DM Sans', sans-serif;
  --trans:      .25s ease;
}

[data-theme="light"] {
  --bg:         #f4f4fa;
  --surface:    #ffffff;
  --surface2:   #eeeef8;
  --border:     #dddded;
  --border2:    #ccccdd;
  --text:       #111124;
  --text-muted: #666688;
  --shadow:     0 4px 24px rgba(0,0,0,.10);
}

/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-b);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100dvh;
  transition: background var(--trans), color var(--trans);
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul { list-style: none; }
input, select, textarea { font-family: inherit; }

/* ── Scroll Progress Bar ──────────────────────────────────── */
#kn-scroll-bar {
  position: fixed; top: 0; left: 0; z-index: 9999;
  height: 3px; width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transition: width .1s linear;
  pointer-events: none;
}

/* ── Navigation ───────────────────────────────────────────── */
.kn-nav {
  position: sticky; top: 0; z-index: 900;
  height: var(--nav-h);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: background var(--trans);
}
.kn-nav-inner {
  max-width: 1100px; margin: 0 auto;
  height: 100%; padding: 0 1.25rem;
  display: flex; align-items: center; gap: 1rem;
}
.kn-nav-logo {
  display: flex; align-items: center; gap: .6rem;
  font-family: var(--font-d); font-weight: 800; font-size: 1.15rem;
  color: var(--text);
  flex-shrink: 0;
}
.kn-nav-logo img { border-radius: 6px; }
.kn-nav-links {
  display: flex; align-items: center; gap: .25rem;
  margin-left: auto;
}
.kn-nav-link {
  padding: .4rem .85rem;
  border-radius: var(--radius-sm);
  font-size: .9rem; font-weight: 500;
  color: var(--text-muted);
  transition: color var(--trans), background var(--trans);
}
.kn-nav-link:hover, .kn-nav-link.active {
  color: var(--text);
  background: var(--surface2);
}
.kn-nav-link.active { color: var(--accent); }

/* Theme toggle */
.kn-theme-btn {
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  color: var(--text-muted);
  border: 1px solid var(--border);
  transition: all var(--trans);
  flex-shrink: 0;
}
.kn-theme-btn:hover { color: var(--accent); border-color: var(--accent); }

/* Show/hide sun-moon icons */
[data-theme="dark"]  .icon-moon { display: none; }
[data-theme="light"] .icon-sun  { display: none; }
:not([data-theme])   .icon-moon { display: none; }

/* Mobile menu button */
.kn-menu-btn {
  display: none; flex-direction: column; justify-content: center;
  gap: 5px; width: 38px; height: 38px;
  padding: 0 8px;
  flex-shrink: 0;
}
.kn-menu-btn span {
  display: block; height: 2px; width: 100%;
  background: var(--text-muted);
  border-radius: 2px;
  transition: all var(--trans);
}
.kn-menu-btn.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.kn-menu-btn.open span:nth-child(2) { opacity: 0; }
.kn-menu-btn.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile menu */
.kn-mobile-menu {
  display: none; position: absolute; top: var(--nav-h); left: 0; right: 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1rem;
  flex-direction: column; gap: .25rem;
  transform: translateY(-10px); opacity: 0;
  transition: all var(--trans);
  pointer-events: none;
}
.kn-mobile-menu.open {
  transform: translateY(0); opacity: 1;
  pointer-events: auto;
  display: flex;
}
.kn-mob-link {
  display: block; padding: .7rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 500; color: var(--text-muted);
  transition: all var(--trans);
}
.kn-mob-link:hover, .kn-mob-link.active {
  background: var(--surface2); color: var(--text);
}
.kn-mob-link.active { color: var(--accent); }

/* ── Footer ───────────────────────────────────────────────── */
.kn-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 2.5rem 1.25rem;
  margin-top: 4rem;
}
.kn-footer-inner {
  max-width: 1100px; margin: 0 auto;
  display: flex; flex-wrap: wrap;
  align-items: center; justify-content: space-between;
  gap: 1.5rem;
}
.kn-footer-logo {
  font-family: var(--font-d); font-weight: 800; font-size: 1.25rem;
  color: var(--accent);
  display: block; margin-bottom: .25rem;
}
.kn-footer-brand p { font-size: .85rem; color: var(--text-muted); }
.kn-footer-brand a { color: var(--accent2); }
.kn-footer-nav {
  display: flex; gap: 1.5rem; flex-wrap: wrap;
}
.kn-footer-nav a {
  font-size: .9rem; color: var(--text-muted);
  transition: color var(--trans);
}
.kn-footer-nav a:hover { color: var(--accent); }
.kn-footer-copy { font-size: .8rem; color: var(--text-muted); width: 100%; }

/* ── Image Fullscreen Overlay ─────────────────────────────── */
#kn-overlay {
  position: fixed; inset: 0; z-index: 9999;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none;
  transition: opacity .3s ease;
}
#kn-overlay.active { opacity: 1; pointer-events: auto; }

.kn-ov-backdrop {
  position: absolute; inset: 0;
  background: rgba(0,0,0,.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.kn-ov-img {
  position: relative; z-index: 1;
  max-width: min(90vw, 680px);
  max-height: 90dvh;
  border-radius: var(--radius);
  box-shadow: 0 0 80px rgba(0,0,0,.8);
  transform: scale(.9);
  transition: transform .3s cubic-bezier(.34,1.56,.64,1);
}
#kn-overlay.active .kn-ov-img { transform: scale(1); }
.kn-ov-close {
  position: absolute; top: 1.25rem; right: 1.25rem; z-index: 2;
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  background: rgba(255,255,255,.1);
  color: white;
  border: 1px solid rgba(255,255,255,.2);
  transition: all var(--trans);
}
.kn-ov-close:hover { background: rgba(255,255,255,.2); transform: scale(1.1); }

/* ── Utility ──────────────────────────────────────────────── */
.seo-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 700px) {
  .kn-nav-links { display: none; }
  .kn-menu-btn  { display: flex; }
  .kn-mobile-menu { display: flex; }

  .kn-footer-inner { flex-direction: column; align-items: flex-start; }
}