:root {
  --header-bg: #343a40;
  --header-text: #ffffff;
  --brand-accent: #c5cbd0;

  --page-bg: #f2f3f3;
  --card-bg: #ffffff;

  --border: #d5d9dc;
  --border-dark: #c4c9cd;

  --text-main: #30373d;
  --text-sub: #5c6871;

  --button: #59636b;
  --button-hover: #434b52;
  --button-light: #edf0f2;

  --result-bg: #f8f9fa;

  --radius: 10px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  background: var(--page-bg);
  color: var(--text-main);
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "Yu Gothic UI",
    "Yu Gothic",
    Meiryo,
    sans-serif;
}

/* Header */

.site-header {
  background: var(--header-bg);
  color: var(--header-text);
}

.header-inner {
  width: 100%;
  max-width: 1100px;
  min-height: 96px;
  margin: 0 auto;
  padding: 20px 8px;

  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-title {
  font-size: 26px;
  line-height: 1.15;
  font-weight: 800;
}

.nikken {
  color: #fff;
}

.product-name {
  color: var(--brand-accent);
}

.brand-subtitle {
  margin-top: 5px;
  font-size: 14px;
}

.login-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

.login-user {
  text-align: right;
  font-size: 12px;
}

.login-user span,
.login-user strong {
  display: block;
}

.logout-button {
  padding: 10px 14px;
  color: #fff;
  background: transparent;
  border: 1px solid #879097;
  border-radius: 7px;
  font-weight: 700;
  cursor: pointer;
}

/* Main */

.page-container {
  width: 100%;
  max-width: 1100px;
  margin: 34px auto;
}

.main-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 26px 22px 22px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.page-heading h1 {
  margin: 0;
  font-size: 27px;
}

.page-heading p {
  margin: 9px 0 0;
  color: var(--text-sub);
}

/* Mode tabs */

.mode-tabs {
  display: flex;
  margin-top: 28px;
  border-bottom: 1px solid var(--border);
}

.mode-tab {
  appearance: none;
  border: 0;
  border-bottom: 3px solid transparent;
  background: transparent;
  padding: 12px 22px;
  color: var(--text-sub);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
}

.mode-tab.active {
  color: var(--text-main);
  border-bottom-color: var(--button);
}

/* Generator */

.generator-layout {
  display: grid;
  grid-template-columns: 42% 58%;
  gap: 20px;
  margin-top: 22px;
}

.settings-panel,
.result-panel {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.settings-panel h2,
.result-panel h2 {
  margin: 0;
  font-size: 19px;
}

.setting-group {
  margin-top: 22px;
}

.setting-label {
  display: block;
  margin-bottom: 9px;
  font-size: 14px;
  font-weight: 700;
}

.preset-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.preset-button,
.phrase-preset-button {
  padding: 8px 12px;
  background: #fff;
  border: 1px solid var(--border-dark);
  border-radius: 6px;
  color: var(--text-main);
  font-weight: 600;
  cursor: pointer;
}

.preset-button.active,
.phrase-preset-button.active {
  background: var(--button);
  border-color: var(--button);
  color: #fff;
}

/* Range */

.range-row {
  display: flex;
  gap: 12px;
  align-items: center;
}

.range-row input[type="range"] {
  flex: 1;
}

.range-row input[type="number"] {
  width: 72px;
  padding: 7px;
  border: 1px solid var(--border-dark);
  border-radius: 5px;
}

.range-labels {
  display: flex;
  justify-content: space-between;
  padding-right: 84px;
  color: var(--text-sub);
  font-size: 11px;
}

/* Options */

.check-row,
.radio-row {
  display: flex;
  align-items: center;
  gap: 7px;
  margin: 9px 0;
  cursor: pointer;
}

.symbol-options {
  margin-left: 26px;
  padding: 8px 12px;
  background: var(--button-light);
  border-radius: 6px;
}

.separator-options {
  display: flex;
  gap: 20px;
}

.sub-note {
  margin: 4px 0 0 26px;
  color: var(--text-sub);
  font-size: 12px;
}

code {
  font-family: Consolas, "Courier New", monospace;
}

select {
  min-width: 90px;
  padding: 8px;
  background: #fff;
  border: 1px solid var(--border-dark);
  border-radius: 5px;
}

/* Buttons */

.generate-button {
  width: 100%;
  margin-top: 26px;
  padding: 12px 18px;
  border: 0;
  border-radius: 7px;
  background: var(--button);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
}

.generate-button:hover,
.regenerate-button:hover {
  background: var(--button-hover);
}

.result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.regenerate-button {
  padding: 8px 13px;
  border: 0;
  border-radius: 6px;
  background: var(--button);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

/* Results */

.result-list {
  margin-top: 18px;
}

.result-item {
  display: flex;
  align-items: center;
  gap: 10px;

  margin-bottom: 10px;
  padding: 13px;

  background: var(--result-bg);
  border: 1px solid var(--border);
  border-radius: 7px;
}

.result-value {
  flex: 1;
  min-width: 0;
  overflow-wrap: anywhere;

  font-family: Consolas, "Courier New", monospace;
  font-size: 16px;
  line-height: 1.6;
}

.copy-button {
  flex: 0 0 auto;
  padding: 7px 11px;
  border: 1px solid var(--border-dark);
  border-radius: 5px;
  background: #fff;
  color: var(--text-main);
  font-weight: 700;
  cursor: pointer;
}

.copy-button:hover {
  background: var(--button-light);
}

.empty-result {
  padding: 35px 20px;
  color: var(--text-sub);
  text-align: center;
}

/* Security note */

.security-note {
  display: flex;
  gap: 14px;
  margin-top: 20px;
  padding: 13px 16px;
  border-radius: 7px;
  background: var(--button-light);
  color: var(--text-sub);
  font-size: 13px;
}

.security-note strong {
  color: var(--text-main);
  white-space: nowrap;
}

/* Toast */

.toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 1000;

  padding: 11px 18px;
  border-radius: 7px;
  background: #343a40;
  color: #fff;
  font-weight: 700;

  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;

  transition:
    opacity 0.2s ease,
    transform 0.2s ease;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */

@media (max-width: 1150px) {
  .header-inner,
  .page-container {
    width: calc(100% - 28px);
  }
}

@media (max-width: 800px) {
  .generator-layout {
    grid-template-columns: 1fr;
  }

  .header-inner {
    align-items: flex-start;
  }

  .login-area {
    display: none;
  }

  .main-card {
    padding: 20px 15px;
  }

  .security-note {
    display: block;
  }

  .security-note strong {
    display: block;
    margin-bottom: 5px;
  }
}

/* Login */

.login-screen {
  max-width: 520px;
  margin: 70px auto;
}

.login-card {
  padding: 36px;

  background: #fff;

  border: 1px solid var(--border);
  border-radius: 12px;

  box-shadow:
    0 2px 8px
    rgba(0, 0, 0, 0.04);

  text-align: center;
}

.login-card h1 {
  margin: 0 0 14px;
  font-size: 26px;
}

.login-card p {
  margin: 0 0 26px;

  color: var(--text-sub);

  line-height: 1.8;
}

/* Header login user area */

#loginArea {
  font-size: 15px;
}

#loginArea .login-label {
  font-size: 14px;
}

#loginUser {
  font-size: 16px;
  font-weight: 600;
}

.logout-button {
  font-size: 15px;
  padding: 8px 14px;
}