:root {
  --bg: #08080c;
  --bg-2: #0e0e15;
  --bg-3: #13131c;
  --fg: #f5f0e8;
  --fg-muted: #9a9486;
  --fg-dim: #5a5650;
  --accent: #4f6ef7;
  --accent-warm: #e8854f;
  --border: #1c1c27;
  --success: #34d399;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'DM Sans', system-ui, sans-serif;
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── NAV ── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 0 clamp(1.5rem, 5vw, 4rem);
  border-bottom: 1px solid var(--border);
  background: rgba(8,8,12,0.85);
  backdrop-filter: blur(20px);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto; height: 64px;
  display: flex; align-items: center; gap: 1rem;
}
.nav-logo {
  font-family: 'DM Mono', monospace; font-size: 0.95rem;
  font-weight: 500; letter-spacing: 0.08em;
  color: var(--fg); text-transform: uppercase;
}
.nav-badge {
  font-size: 0.7rem; letter-spacing: 0.12em; color: var(--accent);
  text-transform: uppercase; border: 1px solid rgba(79,110,247,0.3);
  padding: 0.2rem 0.6rem; border-radius: 2rem;
}
.nav-spacer { flex: 1; }
.nav-link {
  font-size: 0.85rem; color: var(--fg-muted); text-decoration: none;
  transition: color 0.15s;
}
.nav-link:hover { color: var(--fg); }
.nav-link.active { color: var(--accent); }

@media (max-width: 600px) {
  .nav-link { display: none; }
}

/* ── LAYOUT ── */
.container {
  max-width: 900px; margin: 0 auto; padding: 0 clamp(1.5rem, 5vw, 3rem);
}

/* ── HERO SECTION ── */
.tool-hero {
  min-height: 100vh; display: flex; flex-direction: column;
  justify-content: center; padding: 120px clamp(1.5rem, 5vw, 3rem) 80px;
  position: relative; overflow: hidden;
}
.tool-hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse 80% 60% at 20% 30%, rgba(79,110,247,0.07) 0%, transparent 70%),
              radial-gradient(ellipse 60% 80% at 80% 70%, rgba(232,133,79,0.04) 0%, transparent 70%);
  pointer-events: none;
}
.tool-hero-inner { max-width: 700px; margin: 0 auto; width: 100%; position: relative; }
.tool-eyebrow {
  display: flex; align-items: center; gap: 1rem; margin-bottom: 2rem;
  animation: fadeUp 0.5s ease both;
}
.eyebrow-line {
  display: block; width: 32px; height: 1px;
  background: var(--accent);
}
.eyebrow-text {
  font-family: 'DM Mono', monospace; font-size: 0.75rem;
  letter-spacing: 0.15em; color: var(--accent); text-transform: uppercase;
}
.tool-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem); font-weight: 600; line-height: 1.05;
  letter-spacing: -0.03em; margin-bottom: 1.5rem;
  animation: fadeUp 0.5s ease 0.1s both;
}
.tool-title em {
  font-style: normal;
  background: linear-gradient(135deg, var(--accent) 0%, #8b9fff 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.tool-subtitle {
  font-size: 1.1rem; color: var(--fg-muted); margin-bottom: 3rem;
  max-width: 540px; animation: fadeUp 0.5s ease 0.2s both;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── INPUT FORM ── */
.thumbnail-form { animation: fadeUp 0.5s ease 0.3s both; }
.input-row {
  display: flex; gap: 0.75rem; max-width: 600px;
}
.topic-input {
  flex: 1; padding: 0.9rem 1.25rem; font-size: 1rem; font-family: inherit;
  background: var(--bg-2); color: var(--fg); border: 1px solid var(--border);
  border-radius: 8px; outline: none; transition: border-color 0.15s, box-shadow 0.15s;
}
.topic-input::placeholder { color: var(--fg-dim); }
.topic-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79,110,247,0.15);
}
.generate-btn {
  padding: 0.9rem 2rem; font-size: 0.95rem; font-weight: 600;
  font-family: inherit; background: var(--accent); color: #fff;
  border: none; border-radius: 8px; cursor: pointer; white-space: nowrap;
  transition: background 0.15s, transform 0.1s;
}
.generate-btn:hover { background: #3d5af7; transform: translateY(-1px); }
.generate-btn:active { transform: translateY(0); }
.generate-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.input-hint { font-size: 0.8rem; color: var(--fg-dim); margin-top: 0.75rem; }

/* ── LOADING STATE ── */
.loading-state {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: 1.5rem;
  padding: 6rem 2rem; animation: fadeUp 0.4s ease;
}
.loading-spinner {
  width: 48px; height: 48px; border: 3px solid var(--border);
  border-top-color: var(--accent); border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-label { font-size: 0.9rem; color: var(--fg-muted); text-align: center; }
.loading-steps {
  display: flex; gap: 2rem; margin-top: 0.5rem;
}
.loading-step {
  display: flex; align-items: center; gap: 0.5rem;
  font-size: 0.8rem; color: var(--fg-dim);
}
.loading-step.active { color: var(--accent); }
.loading-step-dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--border);
}
.loading-step.active .loading-step-dot { background: var(--accent); }

/* ── GALLERY GRID ── */
.gallery-section { padding: 3rem 0 6rem; animation: fadeUp 0.5s ease; }
.gallery-heading {
  font-size: 1.5rem; font-weight: 600; margin-bottom: 2rem;
  display: flex; align-items: center; gap: 1rem;
}
.gallery-heading span {
  font-size: 0.85rem; color: var(--fg-muted); font-weight: 400;
}
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}
.thumbnail-card {
  background: var(--bg-2); border: 1px solid var(--border);
  border-radius: 12px; overflow: hidden;
  transition: border-color 0.2s, transform 0.2s;
}
.thumbnail-card:hover {
  border-color: rgba(79,110,247,0.4);
  transform: translateY(-2px);
}
.thumbnail-img {
  width: 100%; aspect-ratio: 16/9; object-fit: cover;
  display: block; background: var(--bg-3);
}
.thumbnail-footer {
  padding: 0.875rem 1rem; display: flex;
  align-items: center; justify-content: space-between;
}
.thumbnail-num {
  font-family: 'DM Mono', monospace; font-size: 0.75rem;
  color: var(--fg-dim); letter-spacing: 0.1em;
}
.download-btn {
  display: flex; align-items: center; gap: 0.4rem;
  padding: 0.5rem 1rem; font-size: 0.8rem; font-weight: 600;
  font-family: inherit; background: var(--bg-3); color: var(--fg);
  border: 1px solid var(--border); border-radius: 6px; cursor: pointer;
  text-decoration: none; transition: background 0.15s, border-color 0.15s;
}
.download-btn:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ── ERROR STATE ── */
.error-banner {
  background: rgba(239,68,68,0.1); border: 1px solid rgba(239,68,68,0.3);
  border-radius: 8px; padding: 1rem 1.25rem; margin-top: 1.5rem;
  color: #fca5a5; font-size: 0.9rem; animation: fadeUp 0.4s ease;
}

/* ── REGENERATE ── */
.regenerate-row {
  margin-top: 3rem; display: flex; justify-content: center;
  animation: fadeUp 0.5s ease;
}
.regenerate-btn {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.75rem 1.75rem; font-size: 0.9rem; font-weight: 600;
  font-family: inherit; background: transparent; color: var(--fg-muted);
  border: 1px solid var(--border); border-radius: 8px; cursor: pointer;
  transition: all 0.15s;
}
.regenerate-btn:hover { color: var(--fg); border-color: var(--fg-dim); }

/* ── FOOTER ── */
.tool-footer {
  padding: 2rem clamp(1.5rem, 5vw, 3rem);
  border-top: 1px solid var(--border);
  text-align: center; font-size: 0.8rem; color: var(--fg-dim);
}