frontend/src/styles.css

:root {
  --bg1: #F6F9FF;
  --bg2: #FFFFFF;
  --accent: #3A6FF8;
  --text: #0F172A;
  --muted: #64748B;
  --border: #E7EAF3;
  --shadow: 0 10px 30px rgba(0,0,0,0.06);
  --radius: 14px;
}

html, body, #root { height: 100%; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: linear-gradient(180deg, var(--bg1) 0%, var(--bg2) 60%);
  color: var(--text);
}

.nav {
  position: sticky;
  top: 0;
  backdrop-filter: blur(10px);
  background: rgba(255,255,255,0.7);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  z-index: 10;
}
.logo { font-weight: 600; letter-spacing: 0.2px; }
.icon-btn {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 10px;
  background: #fff;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}
.icon-btn:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(58,111,248,0.1);
}
.icon-btn:active {
  transform: translateY(0);
}

.container { max-width: 960px; margin: 0 auto; padding: 24px; }

.hero { position: relative; padding: 36px 20px 20px; }
.hero h1 { margin: 0 0 8px; font-size: 32px; }
.hero p { margin: 0; color: var(--muted); }
.hero .illus { position: absolute; right: 12px; top: 0; opacity: 0.12; }

.steps { display: flex; align-items: center; gap: 12px; padding: 12px 0 0; }
.step {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  transition: color 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.step .dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--border);
  box-shadow: inset 0 0 0 1px var(--border);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.step.active { color: var(--text); }
.step.active .dot { background: var(--accent); box-shadow: 0 0 12px rgba(58,111,248,0.7); }
.step-line { height: 1px; flex: 1; background: var(--border); transition: background-color 0.3s ease; }

.grid { display: grid; gap: 14px; margin-top: 16px; }
.bento { display: grid; grid-template-columns: 2fr 1fr; grid-auto-rows: minmax(120px, auto); gap: 14px; margin-top: 16px; }
.bento-a { grid-column: 1 / 2; }
.bento-b { grid-column: 2 / 3; }
.bento-c { grid-column: 2 / 3; }
.bento-full { grid-column: 1 / -1; }
.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px; }
.card h3 { margin: 0 0 10px; }

.pill-toggle { display: inline-flex; background: #F2F5FF; border-radius: 999px; padding: 4px; gap: 6px; }
.pill-btn {
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  background: transparent;
  transition: transform .15s ease-out, background-color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.pill-btn.active { background: #fff; border-color: var(--border); box-shadow: var(--shadow); }
.pill-btn:hover { transform: scale(1.03); }

.dropzone {
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 18px;
  background: rgba(250,250,255,0.6);
  text-align: center;
  transition: all 0.2s ease;
  cursor: pointer;
  display: block;
}
.dropzone:hover {
  border-color: var(--accent);
  background: rgba(58,111,248,0.02);
}
.dropzone input { display: none; }
.dz-label { color: var(--muted); margin: 0; line-height: 1.2; }

.boards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.board-tile { border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; background: #fff; cursor: pointer; transition: transform .15s ease-out, box-shadow .15s; }
.board-tile:hover { transform: scale(1.03); box-shadow: var(--shadow); }
.board-tile.active { outline: 2px solid var(--accent); }

.center { display: flex; justify-content: center; }
.primary {
  background: var(--accent);
  color: white;
  border: none;
  padding: 10px 18px;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}
.primary:hover {
  transform: scale(1.03);
  box-shadow: 0 4px 12px rgba(58,111,248,0.25);
}
.primary:active {
  transform: scale(0.98);
}
.primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.process-box { display: flex; flex-direction: column; gap: 10px; align-items: center; }
.paper-horiz { width: 100%; max-width: 560px; height: 180px; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); position: relative; overflow: hidden; padding: 14px 12px; display: flex; align-items: center; justify-content: center; }
.hlines { position: absolute; inset: 16px 16px; display: grid; grid-auto-rows: 1fr; row-gap: 10px; width: calc(100% - 32px); height: calc(100% - 32px); }
.hline { height: 10px; border-radius: 6px; background: #111; transform-origin: left center; transform: scaleX(0); animation: draw-line-slow 1800ms cubic-bezier(.25,1,.5,1) infinite; animation-delay: calc(var(--i) * 160ms); }
.hline:nth-child(odd) { height: 8px; opacity: 0.9; }
.hline:nth-child(3n) { width: 92%; }
.hline:nth-child(3n+1) { width: 78%; }
.hline:nth-child(3n+2) { width: 64%; }

@keyframes draw-line-slow {
  0%   { transform: scaleX(0); }
  55%  { transform: scaleX(1.06); }
  75%  { transform: scaleX(0.95); }
  100% { transform: scaleX(1); }
}

.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 10px; border-bottom: 1px solid #F5F7FB; }
thead th { text-align: left; background: #FAFBFF; }
.edit-input { width: 100%; padding: 6px 8px; border: 1px solid var(--border); border-radius: 8px; transition: border-color 0.15s ease, box-shadow 0.15s ease; }
.edit-input:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 3px rgba(58,111,248,0.15); }

.modal-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,0.25); display: flex; align-items: center; justify-content: center; }
.modal { width: 90%; max-width: 720px; background: #fff; border-radius: 16px; box-shadow: var(--shadow); padding: 16px; }

/* Smooth fade-in class */
.fade-in {
  animation: fadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Mobile responsiveness */
@media (max-width: 640px) {
  .nav { padding: 10px 14px; }
  .logo { font-size: 15px; }
  .container { padding: 16px; }
  .hero { padding: 24px 8px 12px; }
  .hero h1 { font-size: 22px; }
  .hero p { font-size: 13px; }
  .hero .illus { display: none; }

  .steps { gap: 8px; flex-wrap: wrap; }
  .step span { font-size: 12px; }

  .grid { gap: 10px; }
  .bento { grid-template-columns: 1fr; }
  .bento-a, .bento-b, .bento-c, .bento-full { grid-column: auto; }
  .card { padding: 12px; }

  .pill-btn { padding: 8px 12px; font-size: 14px; }

  .dropzone { padding: 14px; }
  .dz-label { font-size: 13px; }

  .boards { grid-template-columns: 1fr; }
  .board-tile { padding: 14px; }

  .center { padding: 4px 0 8px; }
  .primary { width: 100%; padding: 12px 14px; font-size: 15px; }

  table { font-size: 13px; }
  th, td { padding: 8px; }
}