:root {
  --bg: #07111a;
  --bg-2: #0b1722;
  --card: rgba(17, 25, 40, 0.52);
  --card-2: rgba(13, 20, 32, 0.54);
  --text: #edf5fb;
  --muted: #9db0bf;
  --accent: #57d6ff;
  --accent-2: #86f1ff;
  --border: rgba(255, 255, 255, 0.09);
  --danger: #ff6b6b;
  --danger-soft: rgba(255, 107, 107, 0.14);
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.30);
}

body.light {
  --bg: #edf4fb;
  --bg-2: #e6eef8;
  --card: rgba(255, 255, 255, 0.62);
  --card-2: rgba(255, 255, 255, 0.52);
  --text: #18222c;
  --muted: #657789;
  --accent: #0f8fa5;
  --accent-2: #0bc5ea;
  --border: rgba(24, 34, 44, 0.08);
  --danger: #c84641;
  --danger-soft: rgba(200, 70, 65, 0.10);
  --shadow: 0 20px 60px rgba(18, 38, 63, 0.10);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(87,214,255,0.18), transparent 24%),
    radial-gradient(circle at bottom right, rgba(87,214,255,0.12), transparent 22%),
    linear-gradient(135deg, var(--bg), var(--bg-2));
  color: var(--text);
  transition: background 0.35s ease, color 0.35s ease;
}

.hidden {
  display: none !important;
}

.page {
  min-height: 100vh;
  padding: 88px 20px 32px;
  animation: pageFade 0.35s ease;
}

@keyframes pageFade {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.center-page {
  display: flex;
  align-items: center;
  justify-content: center;
}

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(10, 16, 24, 0.45);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
  z-index: 20;
}

body.light .topbar {
  background: rgba(255, 255, 255, 0.45);
}

.logo {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.2px;
}

#logoSub {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
}

.brand-mark {
  position: fixed;
  left: 18px;
  bottom: 14px;
  font-size: 18px;
  font-weight: 700;
  color: var(--accent);
  opacity: 0.85;
  pointer-events: none;
}

.glass-card,
.card,
.tool-btn,
.setting-item,
.result-box,
.shape-preview-wrap,
.converter-block,
.converter-output,
.history-item {
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
}

.card {
  position: relative;
  width: 100%;
  max-width: 560px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 30px;
  padding: 28px;
  box-shadow: var(--shadow);
}

.auth-card {
  text-align: center;
  overflow: hidden;
}

.hero-orb {
  position: absolute;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  filter: blur(24px);
  opacity: 0.34;
  pointer-events: none;
}

.hero-orb-1 {
  top: -50px;
  left: -40px;
  background: rgba(87, 214, 255, 0.24);
}

.hero-orb-2 {
  right: -40px;
  bottom: -60px;
  background: rgba(134, 241, 255, 0.20);
}

.auth-card h1 {
  margin: 0 0 12px;
  font-size: 44px;
  background: linear-gradient(90deg, var(--accent), #ffffff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.auth-card p {
  margin: 0 0 24px;
  color: var(--muted);
  line-height: 1.6;
}

.home-wrap {
  width: 100%;
  max-width: 760px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.tool-btn {
  width: 100%;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  border-radius: 26px;
  padding: 24px;
  text-align: left;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}

.tool-btn:hover {
  transform: translateY(-3px);
  border-color: rgba(87, 214, 255, 0.30);
  background: var(--card-2);
}

.tool-btn.disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.tool-title {
  display: block;
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
}

.tool-sub {
  display: block;
  font-size: 14px;
  color: var(--muted);
}

.profile-card {
  max-width: 640px;
}

.profile-top {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-bottom: 24px;
}

.profile-top img {
  width: 84px;
  height: 84px;
  border-radius: 50%;
  border: 1px solid var(--border);
  object-fit: cover;
}

.profile-top h2 {
  margin: 0 0 6px;
  font-size: 24px;
}

.profile-top p {
  margin: 0;
  color: var(--muted);
  word-break: break-word;
}

.settings-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 20px;
}

.setting-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--card-2);
}

.setting-item label,
.setting-item span {
  font-weight: 600;
}

.setting-item select {
  min-width: 160px;
  padding: 12px 14px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.05);
  color: var(--text);
  outline: none;
}

.setting-item option,
.converter-field option {
  color: #111;
}

.profile-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

.btn {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 13px 17px;
  background: var(--card-2);
  color: var(--text);
  cursor: pointer;
  font-weight: 600;
  transition: transform 0.18s ease, filter 0.18s ease, box-shadow 0.18s ease;
}

.btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.03);
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  width: 100%;
  background: linear-gradient(135deg, rgba(87,214,255,0.18), rgba(134,241,255,0.10));
  color: var(--text);
  box-shadow: 0 10px 30px rgba(87, 214, 255, 0.12);
}

.btn-ghost {
  background: rgba(255,255,255,0.03);
}

.btn-danger {
  background: var(--danger-soft);
  color: var(--danger);
  border-color: rgba(255, 107, 107, 0.24);
}

.area-card,
.converter-card {
  max-width: 760px;
}

.area-back-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.area-hint {
  margin-top: 10px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.coords-textarea {
  width: 100%;
  min-height: 220px;
  resize: vertical;
  margin-top: 18px;
  padding: 15px 16px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--card-2);
  color: var(--text);
  font-size: 15px;
  line-height: 1.6;
  outline: none;
}

.coords-textarea::placeholder {
  color: var(--muted);
}

.area-actions,
.converter-actions {
  margin-top: 14px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.area-actions .btn,
.converter-actions .btn {
  flex: 1;
}

.area-error {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 16px;
  background: var(--danger-soft);
  color: var(--danger);
  border: 1px solid rgba(255, 107, 107, 0.20);
  font-size: 14px;
}

.shape-preview-wrap {
  margin-top: 18px;
  border: 1px solid var(--border);
  border-radius: 22px;
  background: var(--card-2);
  padding: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

#shapeCanvas {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 16px;
  background: transparent;
}

.area-result {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.result-box {
  padding: 18px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--card-2);
}

.result-box span {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 8px;
}

.result-box strong {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  word-break: break-word;
}

.converter-block {
  margin-top: 18px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 22px;
  background: var(--card-2);
}

.converter-block h3 {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 18px;
}

.converter-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.converter-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 14px;
}

.converter-field label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.converter-field input,
.converter-field select {
  padding: 13px 14px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.04);
  color: var(--text);
  outline: none;
}

.converter-output {
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--card);
}

.converter-output span {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 8px;
}

.converter-output strong {
  font-size: 22px;
  color: var(--text);
  word-break: break-word;
}

.history-section {
  margin: 22px 0;
}

.history-section h3 {
  margin: 0 0 12px;
  color: var(--accent);
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.history-item {
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--card-2);
}

.history-item-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.history-type {
  font-weight: 700;
  color: var(--accent);
}

.history-date {
  font-size: 12px;
  color: var(--muted);
}

.history-text {
  font-size: 14px;
  color: var(--text);
  line-height: 1.5;
  word-break: break-word;
}

.history-empty {
  padding: 14px 16px;
  border: 1px dashed var(--border);
  border-radius: 18px;
  color: var(--muted);
}

@media (max-width: 640px) {
  .auth-card h1 {
    font-size: 34px;
  }

  .tool-title {
    font-size: 19px;
  }

  .profile-top {
    flex-direction: column;
    text-align: center;
  }

  .setting-item {
    flex-direction: column;
    align-items: stretch;
  }

  .setting-item select {
    width: 100%;
  }

  .profile-actions,
  .area-actions,
  .converter-actions {
    flex-direction: column;
  }

  .area-result,
  .converter-grid {
    grid-template-columns: 1fr;
  }

  .card {
    padding: 22px;
    border-radius: 24px;
  }

  .tool-btn,
  .result-box,
  .converter-block,
  .setting-item {
    border-radius: 18px;
  }
}