/* ==========================================================================
   Design tokens (promotion-management-tool と共通)
   ========================================================================== */
:root {
  color-scheme: light dark;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;

  --text-xs: 11px;
  --text-sm: 12.5px;
  --text-base: 14px;
  --text-md: 15px;
  --text-lg: 17px;
  --text-xl: 24px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 999px;

  --transition-fast: 120ms ease;
  --transition-base: 180ms ease;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, .07), 0 1px 2px rgba(0, 0, 0, .04);
  --shadow-md: 0 6px 16px rgba(0, 0, 0, .09);
  --shadow-lg: 0 16px 32px rgba(0, 0, 0, .14);

  --color-bg: #f4f5f7;
  --color-surface: #ffffff;
  --color-surface-raised: #fafbfc;
  --color-border: #dde1e6;
  --color-border-strong: #c2c8d1;
  --color-text: #1f2328;
  --color-text-muted: #656d78;
  --color-text-subtle: #97a0ab;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-active: #1e40af;
  --color-primary-subtle: #eaf0ff;
  --color-warning: #b45309;
  --color-warning-subtle: #fef3e2;
  --color-danger: #dc2626;
  --color-danger-subtle: #fdedec;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #14161a;
    --color-surface: #1c1f26;
    --color-surface-raised: #242832;
    --color-border: #333844;
    --color-border-strong: #454b58;
    --color-text: #e8eaed;
    --color-text-muted: #9aa1ab;
    --color-text-subtle: #6d7480;
    --color-primary: #6d97fb;
    --color-primary-hover: #8bacfc;
    --color-primary-active: #517fe8;
    --color-primary-subtle: #1c2a4d;
    --color-warning: #fbbf24;
    --color-warning-subtle: #3a2707;
    --color-danger: #f87171;
    --color-danger-subtle: #3a1414;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, .4);
    --shadow-md: 0 6px 16px rgba(0, 0, 0, .45);
    --shadow-lg: 0 16px 32px rgba(0, 0, 0, .55);
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  font-size: var(--text-base);
  line-height: 1.6;
}
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.icon { width: 16px; height: 16px; display: inline-block; vertical-align: -3px; flex-shrink: 0; }
.icon-sm { width: 13px; height: 13px; vertical-align: -2px; }
.icon-lg { width: 26px; height: 26px; vertical-align: -6px; }

/* ==========================================================================
   Buttons
   ========================================================================== */
button, .button-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  font-size: var(--text-sm);
  font-family: inherit;
  line-height: 1.4;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}
button:hover, .button-link:hover { text-decoration: none; background: var(--color-surface-raised); border-color: var(--color-border-strong); }
button:active, .button-link:active { transform: translateY(1px); }
button.primary, .button-link.primary { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
button.primary:hover, .button-link.primary:hover { background: var(--color-primary-hover); border-color: var(--color-primary-hover); }
button.ghost, .button-link.ghost { border-color: transparent; background: transparent; }
button.ghost:hover, .button-link.ghost:hover { background: var(--color-surface-raised); }
.icon-button { padding: var(--space-2); border-radius: var(--radius-sm); line-height: 1; }

/* ==========================================================================
   Portal page
   ========================================================================== */
.page { max-width: 1000px; margin: 0 auto; padding: var(--space-8) var(--space-6) var(--space-12); }
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-8);
}
.page-header h1 { font-size: var(--text-xl); margin: 0; }

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-5);
}

.tool-card {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  color: var(--color-text);
  transition: box-shadow var(--transition-base), transform var(--transition-base), border-color var(--transition-base);
}
a.tool-card:hover {
  text-decoration: none;
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}
.tool-card-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-md);
  background: var(--color-primary-subtle);
  color: var(--color-primary);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: var(--space-4);
}
.tool-card h2 {
  font-size: var(--text-md);
  margin: 0 0 var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.tool-card p { margin: 0; font-size: var(--text-sm); color: var(--color-text-muted); }

.tool-card--placeholder { opacity: .7; }
.tool-card--placeholder .tool-card-icon { background: var(--color-surface-raised); color: var(--color-text-subtle); }
.badge {
  display: inline-block;
  margin-top: var(--space-3);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-full);
  background: var(--color-warning-subtle);
  color: var(--color-warning);
  font-size: var(--text-xs);
  font-weight: 600;
}

/* ==========================================================================
   Auth (login)
   ========================================================================== */
.auth-shell { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: var(--space-6); }
.auth-card {
  width: 100%;
  max-width: 380px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-8) var(--space-6);
}
.auth-icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-full);
  background: var(--color-primary-subtle);
  color: var(--color-primary);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto var(--space-4);
}
.auth-title { font-size: var(--text-lg); text-align: center; margin: 0 0 var(--space-6); }
.auth-field { position: relative; display: flex; flex-direction: column; gap: var(--space-1); }
.auth-field label { font-size: var(--text-xs); font-weight: 600; color: var(--color-text-muted); }
.auth-field input {
  padding: var(--space-3) var(--space-10) var(--space-3) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--text-base);
  background: var(--color-surface);
  color: var(--color-text);
  width: 100%;
}
.auth-toggle-visibility {
  position: absolute;
  right: var(--space-1);
  bottom: var(--space-1);
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  padding: var(--space-2);
}
.alert { display: flex; align-items: center; gap: var(--space-2); padding: var(--space-3); border-radius: var(--radius-sm); font-size: var(--text-sm); margin: var(--space-3) 0; }
.alert-danger { background: var(--color-danger-subtle); color: var(--color-danger); }
.auth-card .form-actions { margin-top: var(--space-4); }
.auth-card .form-actions button { width: 100%; justify-content: center; }