:root {
  --bg-base: #0f1218;
  --bg-panel: #171d26;
  --bg-panel-soft: #1f2733;
  --line: #313d4f;
  --line-soft: #3f4d63;
  --text-main: #f4f7fb;
  --text-dim: #b2c0d7;
  --accent: #f7b500;
  --accent-soft: #ffcc4d;
  --danger: #ff6f59;
  --ok: #59d3a8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  color: var(--text-main);
  background:
    radial-gradient(circle at 10% 10%, #25364e 0%, transparent 35%),
    radial-gradient(circle at 90% 80%, #2f3e2f 0%, transparent 40%),
    linear-gradient(135deg, #0d1117 0%, #141b26 50%, #0b1018 100%);
  animation: fade-in 0.6s ease-out;
}

.app-shell {
  width: min(1400px, 96vw);
  margin: 18px auto;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(27, 35, 46, 0.9), rgba(17, 22, 30, 0.95));
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(5px);
}

.top-menu {
  display: flex;
  gap: 22px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
  background: rgba(10, 14, 22, 0.8);
}

.menu-item {
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  color: var(--text-dim);
}

.tool-ribbon {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(23, 30, 40, 0.95), rgba(17, 23, 31, 0.95));
}

.ribbon-btn,
.main-action {
  border: 1px solid var(--line-soft);
  background: linear-gradient(180deg, #202b39, #1a2330);
  color: var(--text-main);
  padding: 10px 14px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.85rem;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.2s ease;
}

.ribbon-btn:hover,
.main-action:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  background: linear-gradient(180deg, #273548, #1f2d3f);
}

.ribbon-btn:disabled,
.main-action:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.content-grid {
  display: grid;
  grid-template-columns: 1.05fr 1.35fr;
  gap: 14px;
  padding: 14px;
}

.panel {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(28, 36, 48, 0.88), rgba(20, 27, 36, 0.9));
  padding: 16px;
  animation: slide-up 0.5s ease-out;
}

.left-panel h1 {
  margin: 0 0 8px;
  font-size: clamp(1.35rem, 2.2vw, 2rem);
}

.left-panel p {
  margin: 0 0 14px;
  color: var(--text-dim);
  line-height: 1.4;
}

.key-block {
  margin-bottom: 12px;
}

label {
  display: block;
  margin-bottom: 6px;
  color: var(--text-dim);
  font-size: 0.88rem;
  letter-spacing: 0.02em;
}

textarea {
  width: 100%;
  min-height: 118px;
  resize: vertical;
  padding: 10px;
  border: 1px solid var(--line);
  background: var(--bg-base);
  color: var(--text-main);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.77rem;
  line-height: 1.35;
}

.file-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 10px 0;
}

.file-col {
  padding: 10px;
  border: 1px solid var(--line);
  background: rgba(15, 20, 28, 0.8);
}

input[type="file"] {
  width: 100%;
  color: var(--text-dim);
  font-size: 0.8rem;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.main-action {
  flex: 1;
  min-width: 200px;
}

.main-action.alt {
  border-color: #44618a;
}

.status-box {
  margin-top: 14px;
  border: 1px solid var(--line);
  background: #111822;
  color: var(--ok);
  padding: 10px;
  min-height: 44px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
  white-space: pre-wrap;
}

.preview-head h2 {
  margin: 0;
}

.preview-head p {
  margin: 4px 0 14px;
  color: var(--text-dim);
}

.canvas-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}

.canvas-card {
  border: 1px solid var(--line);
  background: var(--bg-panel-soft);
  padding: 10px;
}

.canvas-card h3 {
  margin: 0 0 8px;
  font-size: 0.9rem;
  color: #d8e4f3;
}

canvas {
  width: 100%;
  max-height: 280px;
  border: 1px solid #4e6078;
  background:
    linear-gradient(45deg, #1f2937 25%, transparent 25%),
    linear-gradient(-45deg, #1f2937 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #1f2937 75%),
    linear-gradient(-45deg, transparent 75%, #1f2937 75%),
    #0f141c;
  background-size: 22px 22px;
  background-position: 0 0, 0 11px, 11px -11px, -11px 0;
}

@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slide-up {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1000px) {
  .content-grid {
    grid-template-columns: 1fr;
  }

  .file-row {
    grid-template-columns: 1fr;
  }
}