:root {
  --bg: #0a0c12;
  --panel: #131720;
  --text: #e6f7ff;
  --muted: #9fb3c8;
  --accent: #00ffc8;
  --accent-secondary: #ff2da2;
  --border: rgba(0, 255, 200, 0.3);
  --shadow: 0 0 24px rgba(0, 255, 200, 0.25);
  --font: "Inter", "Segoe UI", sans-serif;
}

body.theme-m3 {
  --bg: #f6f6fa;
  --panel: #ffffff;
  --text: #1f1f1f;
  --muted: #5f6368;
  --accent: #6750a4;
  --accent-secondary: #7d5260;
  --border: rgba(103, 80, 164, 0.25);
  --shadow: 0 8px 24px rgba(103, 80, 164, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: linear-gradient(135deg, rgba(0, 255, 200, 0.08), rgba(255, 45, 162, 0.08)), var(--bg);
}

body.theme-m3 {
  background: linear-gradient(180deg, #f8f7ff, #f2f0ff 35%, #f6f6fa);
}

h1, h2, h3 {
  margin: 0 0 16px 0;
}

p {
  margin: 0 0 16px 0;
  color: var(--muted);
}

ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

a {
  color: inherit;
  text-decoration: none;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 32px;
  border-bottom: 1px solid var(--border);
  background: rgba(10, 12, 18, 0.92);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
}

body.theme-m3 .topbar {
  background: rgba(255, 255, 255, 0.9);
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.logo {
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--accent);
}

.title {
  font-size: 1.05rem;
}

.nav {
  display: flex;
  gap: 16px;
  align-items: center;
}

.nav a {
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid transparent;
}

.nav a.active,
.nav a:hover {
  border-color: var(--border);
  box-shadow: var(--shadow);
}

.theme-toggle {
  display: flex;
  gap: 8px;
}

.toggle-btn {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.toggle-btn.active {
  background: linear-gradient(120deg, var(--accent), var(--accent-secondary));
  color: #0a0c12;
  border-color: transparent;
  box-shadow: var(--shadow);
}

body.theme-m3 .toggle-btn.active {
  color: #ffffff;
}

.container {
  padding: 48px 32px;
}

.hero {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 32px;
  align-items: center;
}

.hero h1 {
  font-size: 2.3rem;
}

.hero-cta {
  display: flex;
  gap: 16px;
  margin-top: 24px;
  flex-wrap: wrap;
}

.btn {
  text-decoration: none;
  padding: 12px 20px;
  border-radius: 10px;
  font-weight: 600;
  display: inline-block;
}

.btn.primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-secondary));
  color: #0a0c12;
}

.btn.ghost {
  border: 1px solid var(--border);
  color: var(--text);
}

.stat-grid {
  display: grid;
  gap: 16px;
}

.stat-card {
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 18px;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.stat-label {
  color: var(--muted);
  font-size: 0.9rem;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
}

.section-header {
  margin-bottom: 24px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  box-shadow: var(--shadow);
}

.grid {
  display: grid;
  gap: 16px;
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.roadmap {
  display: grid;
  gap: 16px;
}

.phase-title {
  font-weight: 700;
  margin-bottom: 10px;
}

.architecture-diagram {
  margin-top: 24px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  overflow: auto;
}

.architecture-diagram svg {
  width: 100%;
  min-width: 780px;
  font-family: var(--font);
}

.architecture-diagram .box {
  fill: rgba(19, 23, 32, 0.9);
  stroke: var(--accent);
  stroke-width: 2;
}

body.theme-m3 .architecture-diagram .box {
  fill: #ffffff;
}

.architecture-diagram text {
  fill: var(--text);
  font-size: 14px;
}

.architecture-diagram .arrow {
  stroke: var(--accent);
  stroke-width: 3;
}

.wireframe-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.wireframe-grid figure {
  margin: 0;
  padding: 12px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.wireframe-grid img {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.wireframe-grid figcaption {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.9rem;
}

.hidden {
  display: none;
}

.footer {
  padding: 24px 32px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  color: var(--muted);
}

.mobile-nav {
  display: none;
}

@media (max-width: 960px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .nav {
    flex-wrap: wrap;
  }
}

@media (max-width: 720px) {
  .container {
    padding: 32px 20px;
  }

  .nav {
    display: none;
  }

  .mobile-nav {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
  }

  .footer {
    flex-direction: column;
    gap: 8px;
  }

  .hero h1 {
    font-size: 1.8rem;
  }
}


.editor-shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 20px;
}

.editor-panel {
  display: grid;
  gap: 12px;
}

.editor-canvas {
  min-height: 520px;
  background: var(--panel);
  border: 1px dashed var(--border);
  border-radius: 16px;
  padding: 16px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.editor-card {
  background: rgba(19, 23, 32, 0.85);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  min-height: 120px;
  cursor: grab;
}

body.theme-m3 .editor-card {
  background: #ffffff;
}

.editor-card:active {
  cursor: grabbing;
}

.editor-card h4 {
  margin: 0 0 8px 0;
}

.editor-card [contenteditable="true"] {
  outline: none;
  min-height: 60px;
  color: var(--muted);
}

.editor-toolbar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.editor-btn {
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  cursor: pointer;
}

.editor-hint {
  font-size: 0.85rem;
  color: var(--muted);
}

@media (max-width: 960px) {
  .editor-shell {
    grid-template-columns: 1fr;
  }
}


.editor-grid {
  min-height: 560px;
  background-image:
    linear-gradient(to right, rgba(0,0,0,0.0) 0%, rgba(0,0,0,0.0) 100%),
    linear-gradient(to right, var(--border) 1px, transparent 1px),
    linear-gradient(to bottom, var(--border) 1px, transparent 1px);
  background-size: 100% 100%, 40px 40px, 40px 40px;
  background-position: 0 0, 0 0, 0 0;
  border: 1px dashed var(--border);
  border-radius: 16px;
  padding: 16px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.editor-card.primary {
  grid-column: span 2;
  min-height: 220px;
  border: 1px solid var(--accent);
  box-shadow: var(--shadow);
}

.editor-card .tool-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  font-weight: 600;
}

.editor-card .tool-status {
  font-size: 0.85rem;
  color: var(--accent);
}

.editor-trash {
  position: sticky;
  top: 20px;
  background: rgba(255, 45, 162, 0.12);
  border: 1px solid rgba(255, 45, 162, 0.6);
  color: var(--text);
  border-radius: 12px;
  padding: 16px;
  text-align: center;
  min-height: 80px;
}

.editor-trash.drag-over {
  background: rgba(255, 45, 162, 0.28);
  border-color: rgba(255, 45, 162, 0.9);
}

@media (max-width: 960px) {
  .editor-card.primary {
    grid-column: span 1;
  }
}


.save-bar {
  position: fixed;
  right: 24px;
  bottom: 24px;
  display: none;
  gap: 10px;
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 16px;
  box-shadow: var(--shadow);
  z-index: 999;
}

.save-bar.visible {
  display: flex;
}

.save-bar .save-label {
  font-size: 0.9rem;
  color: var(--muted);
}

.save-bar .save-btn {
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  cursor: pointer;
}

.save-bar .save-btn.primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-secondary));
  color: #0a0c12;
  border-color: transparent;
}

body.theme-m3 .save-bar .save-btn.primary {
  color: #ffffff;
}


.timeline {
  display: grid;
  gap: 16px;
}

.timeline-track {
  position: relative;
  height: 12px;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.timeline-progress {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 45%;
  background: linear-gradient(120deg, var(--accent), var(--accent-secondary));
}

.timeline-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}

.timeline-step {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
}

.timeline-step .label {
  font-weight: 600;
}

.timeline-step .date {
  color: var(--muted);
  font-size: 0.85rem;
}

.user-pill {
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 0.85rem;
  margin-left: 8px;
  color: var(--muted);
}


.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-backdrop.visible {
  display: flex;
}

.modal {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  width: min(860px, 92vw);
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: var(--shadow);
}

.modal h3 {
  margin-top: 0;
}

.modal-close {
  float: right;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  border-radius: 10px;
  padding: 6px 10px;
  cursor: pointer;
}