/* ============================================================
   DMHeader.css — Header & Navigation
   ============================================================ */

/* ── Header ──────────────────────────────────────────────── */
.dm-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--dm-header-h);
  display: flex;
  align-items: center;
  transition: background-color var(--dm-dur-base) var(--dm-ease),
              box-shadow var(--dm-dur-base) var(--dm-ease),
              transform var(--dm-dur-base) var(--dm-ease);
}

.dm-header.dm-header--scrolled {
  background: var(--dm-glass-bg);
  backdrop-filter: blur(var(--dm-glass-blur));
  -webkit-backdrop-filter: blur(var(--dm-glass-blur));
  border-bottom: 1px solid var(--dm-glass-border);
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.dm-header.dm-header--hidden {
  transform: translateY(-100%);
}

.dm-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

/* ── Logo ────────────────────────────────────────────────── */
.dm-header__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  transition: transform var(--dm-dur-base) var(--dm-ease-spring);
}
.dm-header__logo:hover { transform: scale(1.03); }

.dm-logo-icon {
  width: 36px;
  height: 36px;
  background: var(--dm-grad-1);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px var(--dm-accent-glow);
}

.dm-logo-text {
  font-size: var(--dm-fs-lg);
  font-weight: 800;
  background: var(--dm-grad-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

/* ── Nav ─────────────────────────────────────────────────── */
.dm-nav {
  display: flex;
  align-items: center;
  gap: var(--dm-space-md);
}

.dm-nav__link {
  font-size: var(--dm-fs-sm);
  font-weight: 500;
  color: var(--dm-text-2);
  padding: 6px 4px;
  position: relative;
  transition: color var(--dm-dur-base) var(--dm-ease);
  text-decoration: none;
}

.dm-nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--dm-grad-1);
  border-radius: 1px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dm-dur-base) var(--dm-ease);
}

.dm-nav__link:hover,
.dm-nav__link.active {
  color: var(--dm-text);
}
.dm-nav__link:hover::after,
.dm-nav__link.active::after {
  transform: scaleX(1);
}

/* ── Header Actions ──────────────────────────────────────── */
.dm-header__actions {
  display: flex;
  align-items: center;
  gap: var(--dm-space-sm);
}

/* ── Theme Toggle ────────────────────────────────────────── */
.dm-theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--dm-radius-md);
  border: 1px solid var(--dm-border-2);
  background: transparent;
  color: var(--dm-text-2);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--dm-dur-base) var(--dm-ease);
  position: relative;
  overflow: hidden;
}
.dm-theme-toggle:hover {
  border-color: var(--dm-accent);
  color: var(--dm-accent-2);
  background: rgba(124,58,237,0.08);
}
.dm-theme-toggle .dm-icon-moon,
.dm-theme-toggle .dm-icon-sun {
  position: absolute;
  transition: all var(--dm-dur-base) var(--dm-ease);
}
[data-theme="light"] .dm-theme-toggle .dm-icon-moon { opacity: 0; transform: rotate(90deg) scale(0); }
[data-theme="light"] .dm-theme-toggle .dm-icon-sun  { opacity: 1; transform: rotate(0) scale(1); }
[data-theme="dark"]  .dm-theme-toggle .dm-icon-moon { opacity: 1; transform: rotate(0) scale(1); }
[data-theme="dark"]  .dm-theme-toggle .dm-icon-sun  { opacity: 0; transform: rotate(-90deg) scale(0); }
/* default dark */
.dm-theme-toggle .dm-icon-sun  { opacity: 0; transform: rotate(-90deg) scale(0); }
.dm-theme-toggle .dm-icon-moon { opacity: 1; transform: rotate(0) scale(1); }

/* ── Hamburger ───────────────────────────────────────────── */
.dm-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border-radius: var(--dm-radius-md);
  transition: background var(--dm-dur-fast);
}
.dm-hamburger:hover { background: rgba(124,58,237,0.08); }

.dm-hamburger__line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--dm-text);
  border-radius: 1px;
  transition: all var(--dm-dur-base) var(--dm-ease);
  transform-origin: center;
}
.dm-hamburger.active .dm-hamburger__line:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.dm-hamburger.active .dm-hamburger__line:nth-child(2) { opacity: 0; transform: scaleX(0); }
.dm-hamburger.active .dm-hamburger__line:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ── Mobile Menu ─────────────────────────────────────────── */
.dm-mobile-menu {
  display: none;
  position: fixed;
  top: var(--dm-header-h);
  left: 0;
  right: 0;
  background: var(--dm-glass-bg);
  backdrop-filter: blur(var(--dm-glass-blur));
  -webkit-backdrop-filter: blur(var(--dm-glass-blur));
  border-bottom: 1px solid var(--dm-glass-border);
  padding: var(--dm-space-lg) var(--dm-space-xl);
  z-index: 999;
  flex-direction: column;
  gap: var(--dm-space-sm);
  transform: translateY(-20px);
  opacity: 0;
  transition: opacity var(--dm-dur-base), transform var(--dm-dur-base) var(--dm-ease);
}
.dm-mobile-menu.open {
  opacity: 1;
  transform: translateY(0);
}

.dm-mobile-menu__link {
  font-size: var(--dm-fs-md);
  font-weight: 600;
  color: var(--dm-text-2);
  padding: var(--dm-space-sm) 0;
  border-bottom: 1px solid var(--dm-border-2);
  transition: color var(--dm-dur-fast);
}
.dm-mobile-menu__link:hover { color: var(--dm-accent-2); }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 900px) {
  .dm-nav { display: none; }
  .dm-hamburger { display: flex; }
  .dm-mobile-menu { display: flex; }
}