/* =========================
   Custom 404 — Final, Portfolio-Aligned
   ========================= */

*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --page-bg: #f6f7f9;
  --text-main: #2e2e2e;
  --text-muted: rgba(46, 46, 46, 0.72);

  --demo-bg: #111111;
  --demo-text: #ffffff;
  --demo-muted: #9ca3af;

  --border-light: rgba(0, 0, 0, 0.08);
  --border-dark: rgba(255, 255, 255, 0.12);

  --accent: #6eced1;
  --accent-deep: #3fa6a3;

  --radius-lg: 24px;
}

/* ---------- Portfolio frame ---------- */

body {
  margin: 0;
  font-family: Inter, system-ui, sans-serif;
  background: var(--page-bg);
  color: var(--text-main);
}

.shell {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.projectHeader {
  padding: 56px 0 40px;
  border-bottom: 1px solid var(--border-light);
}

.projectNav {
  margin-bottom: 14px;
}

/* Shared back button */
.btnNav {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 999px;
  font-weight: 800;
  font-size: 0.92rem;
  text-decoration: none;
  border: 1px solid rgba(0, 0, 0, 0.12);
  background: rgba(0, 0, 0, 0.04);
  color: var(--text-main);
  transition:
    transform 0.15s ease,
    background 0.15s ease,
    box-shadow 0.15s ease;
}

.btnNav:hover {
  transform: translateY(-1px);
  background: rgba(0, 0, 0, 0.07);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.display {
  font-family: Fraunces, serif;
  font-size: clamp(2rem, 3vw, 2.6rem);
  margin-bottom: 10px;
}

.lead {
  max-width: 70ch;
  color: var(--text-muted);
}

/* ---------- Demo ---------- */

.demo-404 {
  min-height: 100vh;
  padding: 48px 20px;
  display: grid;
  place-items: center;
  background: var(--demo-bg);
  color: var(--demo-text);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.demoCard {
  max-width: 560px;
  text-align: center;
}

.demoCard img {
  width: 100%;
  max-width: 480px;
  margin-bottom: 24px;
}

.demoCard h2 {
  margin: 0 0 12px;
  font-size: 1.75rem;
}

.demoCard p {
  margin: 0 0 28px;
  color: var(--demo-muted);
  line-height: 1.6;
}

/* Primary recovery action */
.primaryAction {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border-radius: 999px;
  font-weight: 800;
  text-decoration: none;
  color: #0b0d10;
  background: linear-gradient(135deg, var(--accent-deep), var(--accent));
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.primaryAction:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
}

/* Responsive */
@media (max-width: 600px) {
  .demoCard h2 {
    font-size: 1.5rem;
  }

  .demoCard img {
    max-width: 360px;
  }
}