/* ═══════════════════════════════════════
   HELLENGINEERS — LAYOUT
═══════════════════════════════════════ */

/* ─── TOPNAV ─── */
.topnav {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  border-bottom: 0.5px solid var(--border);
  display: flex; align-items: center;
  padding: 0 clamp(12px,3vw,32px);
  gap: 14px; z-index: 500;
  transition: background var(--trans), border-color var(--trans);
}
.nav-brand {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--font-h); font-weight: 700;
  font-size: 17px; letter-spacing: -.02em; color: var(--text);
  flex-shrink: 0; white-space: nowrap;
}
.brand-icon {
  width: 30px; height: 30px; background: var(--accent);
  border-radius: 8px; display: flex; align-items: center;
  justify-content: center; color: #fff; font-size: 15px;
  font-weight: 800; flex-shrink: 0;
}
.nav-search {
  flex: 1; max-width: 380px; position: relative;
  display: flex; align-items: center;
}
.nav-search input {
  width: 100%; background: var(--input-bg);
  border: 0.5px solid var(--border); border-radius: 30px;
  padding: 8px 16px 8px 38px; font-size: 13px;
  color: var(--text); outline: none;
  transition: border-color var(--trans);
}
.nav-search input:focus { border-color: var(--accent); }
.nav-search input::placeholder { color: var(--text3); }
.nav-search-icon {
  position: absolute; left: 12px; color: var(--text3);
  pointer-events: none; font-size: 14px;
}
.nav-right { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.icon-btn {
  width: 36px; height: 36px; border-radius: 50%;
  border: 0.5px solid var(--border); background: var(--surface2);
  color: var(--text2); display: flex; align-items: center;
  justify-content: center; font-size: 15px; cursor: pointer;
  transition: border-color var(--trans), color var(--trans);
}
.icon-btn:hover { border-color: var(--border2); color: var(--text); }
.theme-toggle {
  width: 58px; height: 29px; background: var(--surface2);
  border: 0.5px solid var(--border2); border-radius: 15px;
  position: relative; cursor: pointer; display: flex;
  align-items: center; padding: 3px; transition: background var(--trans);
}
.theme-thumb {
  width: 23px; height: 23px; border-radius: 50%;
  background: var(--accent); display: flex; align-items: center;
  justify-content: center; font-size: 12px;
  transition: transform var(--trans);
}
[data-theme="light"] .theme-thumb { transform: translateX(29px); }
.nav-avatar {
  width: 33px; height: 33px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--blue));
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 600; color: #fff; cursor: pointer;
  border: 2px solid transparent; transition: border-color var(--trans);
  flex-shrink: 0;
}
.nav-avatar:hover { border-color: var(--accent); }
.hamburger {
  display: none; background: none; border: 0.5px solid var(--border);
  color: var(--text); width: 36px; height: 36px;
  border-radius: var(--radius); align-items: center;
  justify-content: center; font-size: 18px;
}
.mobile-drawer {
  display: none; position: fixed; top: var(--nav-h);
  left: 0; right: 0; background: var(--bg2);
  border-bottom: 0.5px solid var(--border);
  padding: 14px; z-index: 490; flex-direction: column; gap: 4px;
}
.mobile-drawer.open { display: flex; }
.mobile-drawer a {
  color: var(--text2); font-size: 14px;
  padding: 11px 16px; border-radius: var(--radius); transition: all var(--trans);
}
.mobile-drawer a:hover { background: var(--surface2); color: var(--text); }
.mobile-drawer .m-cta { background: var(--accent); color: #fff !important; }
.sidebar-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,0.5); z-index: 399;
}
.sidebar-overlay.show { display: block; }

/* ─── SIDEBAR ─── */
.sidebar {
  width: var(--sidebar-w); flex-shrink: 0;
  position: fixed; top: var(--nav-h); left: 0; bottom: 0;
  background: var(--bg2); border-right: 0.5px solid var(--border);
  padding: 18px 12px; overflow-y: auto;
  transition: transform var(--trans), background var(--trans);
  z-index: 400; display: flex; flex-direction: column; gap: 3px;
}
.sidebar-section {
  font-size: 10px; font-weight: 600; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--text3);
  padding: 14px 12px 6px;
}
.nav-item {
  display: flex; align-items: center; gap: 11px;
  padding: 10px 12px; border-radius: var(--radius);
  color: var(--text2); font-size: 14px; cursor: pointer;
  transition: background var(--trans), color var(--trans);
  border: none; background: none; width: 100%; text-align: left;
  font-family: var(--font-b); text-decoration: none;
}
.nav-item:hover { background: var(--surface2); color: var(--text); }
.nav-item.active {
  background: var(--accent-dim); color: var(--accent);
  font-weight: 500; border: 0.5px solid var(--accent-border);
}
.nav-icon { font-size: 16px; width: 20px; text-align: center; flex-shrink: 0; }
.nav-badge {
  margin-left: auto; background: var(--accent); color: #fff;
  font-size: 10px; font-weight: 600; padding: 1px 6px;
  border-radius: 10px;
}

/* ─── SHELL & MAIN ─── */
.shell { display: flex; min-height: 100vh; padding-top: var(--nav-h); }
.main { margin-left: var(--sidebar-w); flex: 1; min-width: 0; }
.page-inner {
  max-width: 1100px; margin: 0 auto;
  padding: 28px clamp(16px,3vw,36px) 48px;
}
.page-header { margin-bottom: 20px; }
.page-title {
  font-family: var(--font-h); font-size: clamp(22px,4vw,32px);
  font-weight: 800; letter-spacing: -.03em; color: var(--text);
}
.page-sub { font-size: 14px; color: var(--text2); margin-top: 5px; font-weight: 300; }

/* ─── TWO COLUMN FEED LAYOUT ─── */
.feed-grid {
  display: grid; grid-template-columns: 1fr 300px;
  gap: 20px; max-width: 1100px;
  margin: 0 auto; padding: 20px clamp(16px,3vw,36px) 40px;
}
.discuss-grid {
  display: grid; grid-template-columns: 1fr 260px;
  gap: 20px; max-width: 1100px;
  margin: 0 auto; padding: 20px clamp(16px,3vw,36px) 40px;
}

/* ─── FILTER BAR ─── */
.filter-bar {
  display: flex; gap: 8px; flex-wrap: wrap;
  padding: 0 0 20px;
}
.filter-chip {
  padding: 7px 16px; border-radius: 30px; font-size: 13px;
  font-weight: 500; border: 0.5px solid var(--border2);
  background: var(--card-bg); color: var(--text2);
  cursor: pointer; transition: all var(--trans); font-family: var(--font-b);
}
.filter-chip:hover { border-color: var(--accent); color: var(--accent); }
.filter-chip.active { background: var(--accent); border-color: var(--accent); color: #fff; }