/* =============== */
/* 🎨 DESIGN SYSTEM */
/* =============== */
:root {
  --color-bg: #f7f7fb;
  --color-surface: #ffffff;
  --color-accent: #9c27ff;
  --color-border: #d8d8e0;
  --color-text: #1e1e1e;
  --color-muted: #6b6b6b;
  --color-hint-bg: #f0e6ff;
  --radius: 10px;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  --font: "Inter", "Segoe UI", Roboto, system-ui, sans-serif;
}

/* ======= */
/* ⚙ RESET */
/* ======= */
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family: var(--font);
  color: var(--color-text);
  background-color: var(--color-bg);
  height: 100vh;
  display: flex;
  flex-direction: column;
}
h1, h2, h3, h4, p {
  margin: 0;
}

/* =============== */
/* 🔝 TOP BAR */
/* =============== */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-surface);
  padding: 14px 20px;
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow);
}

.topbar h1 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-accent);
}

.files {
  display: flex;
  align-items: center;
  gap: 8px;
}

.file-btn {
  position: relative;
  overflow: hidden;
  background: #f2f2f8;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 6px 12px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s ease;
}
.file-btn:hover {
  background: #ebe7ff;
}
.file-btn input {
  position: absolute;
  left: 0;
  top: 0;
  opacity: 0;
  width: 100%;
  height: 100%;
  cursor: pointer;
}

.primary {
  background: var(--color-accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  padding: 8px 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 2px 6px rgba(156, 39, 255, 0.3);
}
.primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

/* =================== */
/* 📑 MAIN GRID LAYOUT */
/* =================== */
.main {
  display: grid;
  grid-template-columns: 280px 1fr 300px;
  gap: 16px;
  padding: 20px;
  flex: 1;
  overflow: hidden;
}
.question-text {
  font-size: 15px;
  font-weight: 500;
  margin: 8px 0 4px;
  color: var(--color-text);
}
.sub-questions {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sub-block {
  background: #f9f9ff;
  border-radius: 8px;
  padding: 10px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.variant-select {
  width: 100%;
  padding: 8px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  font-size: 14px;
  background-color: #fff;
}

.variant-select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px rgba(156, 39, 255, 0.15);
}

/* =============== */
/* 📋 SIDEBAR TREE */
/* =============== */
.sidebar {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 10px;
}

.tree ul {
  list-style: none;
  padding-left: 8px;
  margin: 0;
}
.tree li {
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
  color: var(--color-muted);
  font-size: 14px;
  transition: all 0.15s ease;
}
.tree li:hover {
  background: #f2ecff;
}
.tree li.active {
  background: var(--color-accent);
  color: #fff;
  font-weight: 600;
}

/* =================== */
/* 💬 CENTER STEP CARD */
/* =================== */
.center {
  display: flex;
  justify-content: center;
}
.card {
  width: 100%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.big-hint {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
}
.hint {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 4px;
}
.comment {
  background: var(--color-accent);
  color: #fff;
  padding: 12px;
  border-radius: var(--radius);
  font-size: 13px;
  line-height: 1.5;
  box-shadow: 0 2px 6px rgba(156, 39, 255, 0.3);
}

/* Input zone */
.input-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 6px;
}
.input-row label {
  font-size: 13px;
  color: var(--color-muted);
}
.input-row input {
  padding: 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--color-text);
  outline: none;
  transition: 0.2s;
}
.input-row input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px rgba(156, 39, 255, 0.15);
}

/* Buttons under step */
.controls {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  margin-top: 8px;
}
.controls button {
  border: 1px solid var(--color-border);
  background: #f5f5fa;
  color: var(--color-text);
  border-radius: var(--radius);
  padding: 8px 14px;
  cursor: pointer;
  font-size: 13px;
  transition: all 0.2s;
}
.controls button:hover {
  background: #ece4ff;
}
.controls .primary {
  background: var(--color-accent);
  color: #fff;
  border: none;
}

/* =============== */
/* 🧾 SUMMARY BOX */
/* =============== */
.summary {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px;
}
.summary h3 {
  font-size: 15px;
  margin-bottom: 10px;
}
.summary-box {
  background: #f9f8ff;
  border-radius: var(--radius);
  padding: 10px;
  overflow-y: auto;
  max-height: 70vh;
}
.summary-row {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px dashed var(--color-border);
  padding: 6px 0;
  font-size: 13px;
}
.summary-row .stepid {
  color: var(--color-accent);
  font-weight: 600;
  width: 60px;
}
.summary-row .val {
  flex: 1;
  text-align: right;
  color: var(--color-text);
}

/* =============== */
/* ⚓ FOOTER */
/* =============== */
.footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-muted);
  text-align: center;
  padding: 10px;
  font-size: 13px;
}