:root {
  --navy:    #1e3a5f;
  --blue:    #1e7fd4;
  --blue-lt: #3a9fe8;
  --orange:  #e8651a;
  --white:   #ffffff;
  --grid-bg: #eef5fc;
  --grid-ln: rgba(30,127,212,0.12);
  --grid-ln2:rgba(30,127,212,0.06);
  --text:    #1a2e45;
  --muted:   #5b7a9d;
  --border:  rgba(30,127,212,0.2);
  --card-bg: rgba(255,255,255,0.85);
  --shadow:  0 2px 12px rgba(30,63,95,0.10);
}

* { margin:0; padding:0; box-sizing:border-box; }

body {
  background-color: var(--grid-bg);
  background-image:
    linear-gradient(var(--grid-ln) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-ln) 1px, transparent 1px),
    linear-gradient(var(--grid-ln2) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-ln2) 1px, transparent 1px);
  background-size: 80px 80px, 80px 80px, 16px 16px, 16px 16px;
  color: var(--text);
  font-family: 'Nunito', sans-serif;
  min-height: 100vh;
}

/* ── TOP NAV BAR ── */
.topbar {
  background: var(--white);
  box-shadow: 0 2px 8px rgba(30,63,95,0.08);
  border-bottom: 1.5px solid var(--border);
  padding: 0 32px;
  display: flex;
  align-items: center;
  height: 96px;
  position: sticky;
  top: 0;
  z-index: 50;
}

.topbar-logo {
  height: 80px;
  width: auto;
  display: block;
}

.topbar-tagline {
  margin-left: 20px;
  font-family: 'DM Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
  border-left: 1px solid var(--border);
  padding-left: 20px;
}

.topbar-badge {
  margin-left: auto;
  background: var(--orange);
  color: white;
  font-family: 'DM Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 5px 14px;
  border-radius: 2px;
  font-weight: 500;
}

/* ── MAIN LAYOUT ── */
.app {
  max-width: 920px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

/* ── API KEY BAR ── */
.api-bar {
  background: var(--white);
  border: 1.5px solid var(--border);
  border-left: 4px solid var(--orange);
  border-radius: 4px;
  padding: 14px 18px;
  margin-bottom: 28px;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 14px;
}

.api-bar-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange);
  white-space: nowrap;
  font-weight: 500;
}

.api-bar input {
  flex: 1;
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text);
  font-family: 'DM Mono', monospace;
  font-size: 0.82rem;
  padding: 8px 12px;
  outline: none;
  letter-spacing: 0.04em;
  background: #f7fafd;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.api-bar input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(30,127,212,0.1);
}
.api-bar input::placeholder { color: #aabccc; }

/* ── SECTION LABELS ── */
.section-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--blue);
  font-weight: 600;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ── UPLOAD ZONE ── */
.upload-zone {
  background: var(--white);
  border: 2px dashed rgba(30,127,212,0.35);
  border-radius: 6px;
  padding: 56px 40px;
  text-align: center;
  cursor: pointer;
  transition: all 0.25s;
  position: relative;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
}
.upload-zone:hover, .upload-zone.drag-over {
  border-color: var(--blue);
  background: #f0f7ff;
  box-shadow: 0 4px 20px rgba(30,127,212,0.15);
}
.upload-zone.has-image {
  padding: 0;
  border-style: solid;
  border-color: var(--blue);
  overflow: hidden;
}

.upload-icon-svg { width: 52px; height: 52px; margin: 0 auto 18px; }

.upload-zone h2 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--navy);
  margin-bottom: 6px;
  letter-spacing: 0.01em;
}
.upload-zone p {
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.06em;
}

#fileInput { display: none; }

.preview-img {
  width: 100%;
  max-height: 420px;
  object-fit: contain;
  display: none;
  background: #0a0a14;
}
.preview-overlay {
  display: none;
  position: absolute;
  top: 12px; right: 12px;
  background: var(--navy);
  color: rgba(255,255,255,0.7);
  border-radius: 3px;
  padding: 5px 12px;
  font-family: 'DM Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.1em;
}

/* ── SETTINGS PANEL ── */
.settings-panel {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 14px;
  margin-bottom: 24px;
}

.setting-group {
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 4px;
  padding: 14px 16px;
  box-shadow: var(--shadow);
}

.setting-group label {
  display: block;
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
  font-weight: 600;
}

.setting-group select,
.setting-group input[type="text"],
.setting-group input[type="number"] {
  width: 100%;
  background: #f7fafd;
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text);
  font-family: 'Nunito', sans-serif;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 8px 10px;
  outline: none;
  appearance: none;
  transition: border-color 0.2s;
}
.setting-group select:focus,
.setting-group input[type="text"]:focus,
.setting-group input[type="number"]:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(30,127,212,0.1);
}
.setting-group input[type="text"]::placeholder { color: #aabccc; }

/* ── CONVERT / ACTION BUTTONS ── */
.convert-btn {
  width: 100%;
  padding: 18px;
  background: linear-gradient(135deg, var(--blue) 0%, var(--navy) 100%);
  border: none;
  border-radius: 5px;
  color: white;
  font-family: 'Nunito', sans-serif;
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
  margin-bottom: 24px;
  box-shadow: 0 4px 16px rgba(30,127,212,0.35);
  text-transform: uppercase;
}
.convert-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(30,127,212,0.45);
}
.convert-btn:active:not(:disabled) { transform: translateY(0); }
.convert-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

/* Secondary variant — slightly different shade */
.convert-btn--secondary {
  background: linear-gradient(135deg, #1a6bb5 0%, var(--navy) 100%);
  margin-top: 14px;
}

.convert-btn .progress-bar {
  position: absolute;
  bottom: 0; left: 0;
  height: 4px;
  background: var(--orange);
  width: 0%;
  transition: width 0.5s ease;
  border-radius: 0 2px 2px 0;
}

/* ── STATUS LOG ── */
.status-log {
  background: var(--navy);
  border-radius: 5px;
  margin-bottom: 24px;
  display: none;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.status-log.visible { display: block; }
.log-header {
  background: rgba(0,0,0,0.25);
  padding: 8px 16px;
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
}
.log-body {
  padding: 14px 16px;
  max-height: 200px;
  overflow-y: auto;
}
.log-line {
  display: flex; gap: 10px; margin-bottom: 5px;
  font-family: 'DM Mono', monospace; font-size: 0.74rem; line-height: 1.5;
  opacity: 0; animation: logIn 0.3s forwards;
}
@keyframes logIn { from{opacity:0;transform:translateX(-6px)} to{opacity:1;transform:translateX(0)} }
.log-line .ts  { color: rgba(255,255,255,0.25); flex-shrink: 0; }
.log-line .msg { color: rgba(255,255,255,0.8); }
.log-line.ok   .msg { color: #4ecb85; }
.log-line.err  .msg { color: #ff6b6b; }
.log-line.info .msg { color: var(--blue-lt); }

/* ── ERROR ── */
.error-section {
  display: none;
  padding: 14px 18px;
  background: #fff5f5;
  border: 1.5px solid #ffb3b3;
  border-left: 4px solid #e85555;
  border-radius: 4px;
  margin-bottom: 20px;
}
.error-section.visible { display: block; }
.error-section p { font-size: 0.85rem; color: #c0392b; font-weight: 600; }

/* ── CHAT SECTION ── */
.chat-section {
  display: none;
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 6px;
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
}
.chat-section.visible { display: block; }

.chat-log {
  min-height: 80px;
  max-height: 420px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
  padding-right: 4px;
}

.chat-bubble {
  max-width: 80%;
  padding: 12px 16px;
  border-radius: 6px;
  font-size: 0.92rem;
  line-height: 1.6;
  white-space: pre-wrap;
}
.chat-bubble--ai {
  background: var(--grid-bg);
  border: 1.5px solid var(--border);
  border-bottom-left-radius: 2px;
  color: var(--text);
  align-self: flex-start;
}
.chat-bubble--user {
  background: var(--navy);
  color: rgba(255,255,255,0.92);
  border-bottom-right-radius: 2px;
  align-self: flex-end;
}

.chat-input-row {
  display: flex;
  gap: 10px;
}
.chat-input-row input {
  flex: 1;
  background: #f7fafd;
  border: 1.5px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-family: 'Nunito', sans-serif;
  font-size: 0.9rem;
  padding: 11px 14px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.chat-input-row input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(30,127,212,0.1);
}
.chat-input-row input::placeholder { color: #aabccc; }

.chat-send-btn {
  background: var(--blue);
  color: white;
  border: none;
  border-radius: 4px;
  font-family: 'Nunito', sans-serif;
  font-size: 0.88rem;
  font-weight: 700;
  padding: 11px 22px;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
  white-space: nowrap;
}
.chat-send-btn:hover:not(:disabled) {
  background: var(--blue-lt);
  transform: translateY(-1px);
}
.chat-send-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── RESULTS ── */
.analysis-result { display: none; margin-bottom: 24px; }
.analysis-result.visible { display: block; }

.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}
.result-card {
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 4px;
  padding: 16px;
  text-align: center;
  box-shadow: var(--shadow);
}
.rc-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.58rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 6px;
}
.rc-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--navy);
  line-height: 1;
}

.rooms-list {
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.room-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 18px;
  border-bottom: 1px solid var(--border);
  transition: background 0.15s;
}
.room-item:last-child { border-bottom: none; }
.room-item:hover { background: #f5f9ff; }
.room-name {
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--navy);
}
.room-dim {
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  color: var(--muted);
}

/* ── DOWNLOAD ── */
.download-section {
  display: none;
  background: var(--white);
  border: 2px solid var(--blue);
  border-radius: 6px;
  padding: 36px 40px;
  text-align: center;
  margin-bottom: 36px;
  box-shadow: 0 4px 24px rgba(30,127,212,0.15);
}
.download-section.visible { display: block; }

.download-checkmark {
  font-size: 2.5rem;
  color: #4ecb85;
  margin-bottom: 10px;
}
.download-section h3 {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--navy);
  margin-bottom: 6px;
}
.download-section p {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 24px;
}
.download-btn {
  display: inline-block;
  background: var(--navy);
  color: white;
  font-family: 'DM Mono', monospace;
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 14px 36px;
  border-radius: 4px;
  text-decoration: none;
  transition: all 0.2s;
  box-shadow: 0 3px 12px rgba(30,63,95,0.25);
  margin-bottom: 20px;
}
.download-btn:hover {
  background: var(--blue);
  transform: translateY(-1px);
  box-shadow: 0 5px 18px rgba(30,127,212,0.35);
}
.import-steps {
  background: var(--grid-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 14px 18px;
  text-align: left;
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.7;
}
.import-steps strong { color: var(--navy); }

/* ── HOW TO USE ── */
.instructions { margin-top: 16px; }

.steps {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.step {
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 4px;
  padding: 20px;
  display: flex;
  gap: 16px;
  box-shadow: var(--shadow);
}
.step-num {
  font-family: 'DM Mono', monospace;
  font-size: 1.6rem;
  font-weight: 500;
  color: rgba(30,127,212,0.2);
  line-height: 1;
  flex-shrink: 0;
}
.step-text {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.6;
}
.step-text strong {
  display: block;
  color: var(--navy);
  font-size: 0.9rem;
  margin-bottom: 4px;
}

/* ── FOOTER ── */
footer {
  text-align: center;
  padding: 28px;
  font-family: 'DM Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(30,63,95,0.3);
  border-top: 1px solid var(--border);
  margin-top: 40px;
}

/* ── SPINNER ── */
.spinner {
  display: inline-block;
  width: 14px; height: 14px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* TOPBAR LOGOUT LINK */
.topbar-logout {
  margin-left: 20px;
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 3px;
  transition: all 0.2s;
}
.topbar-logout:hover {
  color: var(--navy);
  border-color: var(--navy);
}