/* proj.css — Shared Layout D shell for all portfolio project pages */
/* Defines: fixed nav + left sidebar + layout wrapper only.
   Page-specific content styles remain inline per page. */

:root {
  --bg:           #03030a;
  --surface:      #0d0d1a;
  --surface2:     #121224;
  --line:         #18182e;
  --line-mid:     #242440;
  --text:         #f0f0f8;
  --text-2:       #c4c4d8;
  --text-3:       #5c5c7a;
  --accent:       #4a7cff;
  --accent-light: #8aaaff;
  --accent-bg:    rgba(74,124,255,0.09);
  --accent-bdr:   rgba(74,124,255,0.25);
  --green:        #4ee89a;
  --green-bg:     rgba(78,232,154,0.07);
  --green-bdr:    rgba(78,232,154,0.22);
  --orange:       #f59e0b;
  --orange-bg:    rgba(245,158,11,0.08);
  --orange-bdr:   rgba(245,158,11,0.25);
  --purple:       #a78bfa;
  --purple-bg:    rgba(167,139,250,0.08);
  --purple-bdr:   rgba(167,139,250,0.25);
  --red:          #f87171;
  --red-bg:       rgba(248,113,113,0.08);
  --red-bdr:      rgba(248,113,113,0.22);
  --cyan:         #22d3ee;
  --cyan-bg:      rgba(34,211,238,0.08);
  --cyan-bdr:     rgba(34,211,238,0.22);
  --sidebar-w:    60px;
  --nav-h:        56px;
}

/* ═══════════════════════════════
   TOP NAV
═══════════════════════════════ */
.p-top-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 500;
  height: var(--nav-h);
  background: rgba(3,3,10,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--line);
  display: flex; align-items: center;
  padding: 0 1.25rem 0 calc(var(--sidebar-w) + 1rem);
  gap: 0.6rem;
  font-family: 'Inter', system-ui, sans-serif;
}
.p-nav-logo {
  font-size: 0.82rem; font-weight: 700; letter-spacing: -0.01em;
  color: var(--text-3); text-decoration: none;
  transition: color 0.15s; flex-shrink: 0;
}
.p-nav-logo:hover { color: var(--text-2); }
.p-nav-sep { color: var(--line-mid); font-size: 1rem; flex-shrink: 0; user-select: none; }
.p-nav-badge {
  font-size: 0.6rem; font-weight: 700; letter-spacing: 0.15em;
  text-transform: uppercase; color: var(--accent-light);
  background: var(--accent-bg); border: 1px solid var(--accent-bdr);
  border-radius: 4px; padding: 0.11rem 0.48rem; white-space: nowrap;
  flex-shrink: 0; line-height: 1.6;
}
.p-nav-badge.g { color: var(--green);  background: var(--green-bg);  border-color: var(--green-bdr); }
.p-nav-badge.o { color: var(--orange); background: var(--orange-bg); border-color: var(--orange-bdr); }
.p-nav-badge.p { color: var(--purple); background: var(--purple-bg); border-color: var(--purple-bdr); }
.p-nav-badge.r { color: var(--red);    background: var(--red-bg);    border-color: var(--red-bdr); }
.p-nav-badge.c { color: var(--cyan);   background: var(--cyan-bg);   border-color: var(--cyan-bdr); }
.p-nav-title {
  font-size: 0.8rem; font-weight: 600; color: var(--text-2);
  flex: 1; min-width: 0;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.p-nav-back {
  display: flex; align-items: center; gap: 0.3rem;
  font-size: 0.74rem; font-weight: 500; color: var(--text-3);
  text-decoration: none; padding: 0.28rem 0.72rem;
  border: 1px solid var(--line); border-radius: 6px;
  transition: all 0.15s; white-space: nowrap; flex-shrink: 0;
}
.p-nav-back:hover { color: var(--text-2); border-color: var(--line-mid); background: var(--surface); }
.p-nav-back svg {
  width: 12px; height: 12px;
  stroke: currentColor; fill: none;
  stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}

/* ═══════════════════════════════
   SIDEBAR
═══════════════════════════════ */
.d-sidebar {
  position: fixed; left: 0; top: var(--nav-h); bottom: 0; z-index: 400;
  width: var(--sidebar-w);
  background: var(--surface);
  border-right: 1px solid var(--line);
  display: flex; flex-direction: column; align-items: center;
  padding: 0.75rem 0; gap: 0.15rem;
  overflow-y: auto; overflow-x: hidden;
  font-family: 'Inter', system-ui, sans-serif;
}
.d-sidebar::-webkit-scrollbar { display: none; }
.d-nav-item {
  position: relative;
  width: 40px; height: 40px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; text-decoration: none;
  color: var(--text-3);
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  border: 1px solid transparent;
  flex-shrink: 0;
}
.d-nav-item svg {
  width: 15px; height: 15px;
  stroke: currentColor; fill: none;
  stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round;
  pointer-events: none;
}
.d-nav-item:hover { background: var(--surface2); color: var(--text-2); }
.d-nav-item.active {
  background: var(--accent-bg);
  color: var(--accent-light);
  border-color: var(--accent-bdr);
}
/* Tooltip label on hover */
.d-nav-item::after {
  content: attr(data-tip);
  position: absolute; left: calc(100% + 12px); top: 50%;
  transform: translateY(-50%);
  background: var(--surface2); border: 1px solid var(--line-mid);
  color: var(--text-2);
  font-size: 0.69rem; font-weight: 500; line-height: 1;
  padding: 0.32rem 0.65rem; border-radius: 5px;
  white-space: nowrap; pointer-events: none;
  opacity: 0; transition: opacity 0.15s; z-index: 600;
  box-shadow: 0 4px 14px rgba(0,0,0,0.45);
}
.d-nav-item:hover::after { opacity: 1; }
.d-sb-sep {
  width: 22px; height: 1px;
  background: var(--line); margin: 0.25rem 0; flex-shrink: 0;
}

/* ═══════════════════════════════
   LAYOUT WRAPPER
═══════════════════════════════ */
.d-layout {
  display: flex;
  min-height: calc(100vh - var(--nav-h));
  margin-top: var(--nav-h);
}
.d-main {
  margin-left: var(--sidebar-w);
  flex: 1; min-width: 0;
}

/* ═══════════════════════════════
   SHARED SECTION HEADER PATTERN
   (optional — pages may or may not use these)
═══════════════════════════════ */
.sec-kicker {
  font-size: 0.65rem; font-weight: 700; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--green);
  margin-bottom: 0.65rem; display: block;
}
.sec-title {
  font-size: clamp(1.4rem, 3vw, 2rem); font-weight: 800;
  letter-spacing: -0.025em; line-height: 1.08;
  color: var(--text); margin-bottom: 0.9rem;
}
.sec-desc {
  font-size: 0.88rem; color: var(--text-2);
  line-height: 1.8; max-width: 760px; margin-bottom: 2rem;
}

/* ═══════════════════════════════
   RESPONSIVE
═══════════════════════════════ */
@media (max-width: 640px) {
  .d-sidebar { display: none; }
  .d-main { margin-left: 0; }
  .p-top-nav { padding-left: 1rem; }
  .p-nav-title { display: none; }
}