/**
 * topnav.css — flowxapi Universal Top Navigation & Mobile Drawer
 * Stack: plain HTML + CSS + vanilla JS
 * Conforms strictly to DESIGN.md — flowxapi
 */

@import './tokens.css';

/* Universal Fixed/Sticky Topnav Bar */
.topnav {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: 64px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  transition: border-color var(--ease);
}

/* Left Brand Area */
.topnav__left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.topnav__brand {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: -0.01em;
  user-select: none;
}

.topnav__brand:hover {
  opacity: 0.9;
}

/* Search Trigger Button */
.topnav__search {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  color: var(--text-muted);
  font-size: 13px;
  cursor: pointer;
  transition: border-color var(--ease), color var(--ease);
}

.topnav__search:hover {
  border-color: var(--border-strong);
  color: var(--text);
}

.topnav__search kbd {
  font-family: var(--font-mono);
  font-size: 11px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 2px 6px;
  color: var(--text-subtle);
}

/* Desktop Navigation Links */
.topnav__links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.topnav__link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  transition: color var(--ease), background var(--ease);
  white-space: nowrap;
}

.topnav__link:hover,
.topnav__link--active {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
}

/* Right Actions (Console, Sign in, Get started, Sign out) */
.topnav__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Mobile Hamburger Toggle Button */
.topnav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0;
  transition: border-color var(--ease), background var(--ease);
}

.topnav__hamburger:hover {
  background: var(--surface-1);
  border-color: var(--border-strong);
}

.topnav__hamburger .hamburger-line {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--text);
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* Hamburger active animation */
.topnav__hamburger.is-active .hamburger-line:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.topnav__hamburger.is-active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.topnav__hamburger.is-active .hamburger-line:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Mobile Drawer Overlay / Dropdown */
.topnav__drawer {
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  z-index: 999;
  display: flex;
  flex-direction: column;
  padding: 24px;
  gap: 20px;
  overflow-y: auto;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.topnav__drawer.is-open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.topnav__drawer-links {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.topnav__drawer-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: background var(--ease), color var(--ease), border-color var(--ease);
}

.topnav__drawer-link:hover,
.topnav__drawer-link--active {
  color: var(--text);
  background: var(--surface-1);
  border-color: var(--border);
}

.topnav__drawer-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.topnav__drawer-actions .btn {
  width: 100%;
  justify-content: center;
  padding: 12px 20px;
}

/* Responsive Media Queries */
@media (max-width: 960px) {
  .topnav__links {
    display: none;
  }

  .topnav__search {
    display: none;
  }

  .topnav__actions {
    display: none;
  }

  .topnav__hamburger {
    display: flex;
  }
}

@media (max-width: 600px) {
  .topnav {
    padding: 0 16px;
  }
}