@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+JP:wght@300;400;500;600;700&family=Inter:wght@300;400;700&display=swap');

/* === Modern CSS Reset & Base Styling === */
:root {
  /* Colors */
  --color-primary: #1c1c1c;
  --color-primary-dark: #989898;
  --color-secondary: #6c757d;
  --color-success: #28a745;
  --color-danger: #dc3545;
  --color-warning: #ffc107;
  --color-info: #17a2b8;
  --color-light: #f8f9fa;
  --color-dark: #343a40;
  --color-text: #212529;
  --color-text-muted: #6c757d;
  --color-background: #ffffff;
  --color-border: #dee2e6;

  /* Typography */
  --font-family-sans-serif: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  --font-size-base: 16px;
  --font-size-lg: 1.25rem;
  --font-size-sm: 0.875rem;
  --font-weight-normal: 400;
  --font-weight-bold: 700;
  --line-height-base: 1.5;

  /* Spacing */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 1rem;
  --spacing-4: 1.5rem;
  --spacing-5: 3rem;

  /* Borders */
  --border-width: 1px;
  --border-radius: 0.375rem;
  --border-radius-sm: 0.25rem;
  --border-radius-lg: 0.5rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

  --bg: #fafaf9;
  --text: #1c1c1c;
  --accent: #1c1c1c;
  --soft: #e7e5e4;
}

*,
::after,
::before {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  border-width: 0;
  border-style: solid;
  border-color: #e5e7eb;
}

html {
  font-size: var(--font-size-base);
}

body {
  font-family: var(--font-family-sans-serif);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-light);
  transition: background-color 1s ease;
}

a {
  cursor: pointer;
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.15s ease-in-out, opacity 0.15s ease-in-out;
  -webkit-tap-highlight-color: transparent;
}

a:hover {
  color: var(--color-primary-dark);
  opacity: 0.9;
}

a:active {
  opacity: 0.7;
}

ul,
ol {
  list-style: none;
}

/* === Common Components === */
.card {
  background-color: var(--color-background);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  padding: var(--spacing-4);
}

/* === Forms === */

.form-group {
  margin-bottom: var(--spacing-3);
}

.form-label {
  display: inline-block;
  margin-bottom: var(--spacing-2);
  font-weight: var(--font-weight-bold);
}

.form-control {
  display: block;
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-background);
  background-clip: padding-box;
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius);
  transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus {
  color: var(--color-text);
  background-color: var(--color-background);
  border-color: #86b7fe;
  outline: 0;
  box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

.form-control:disabled {
  background-color: var(--color-light);
  opacity: 0.7;
}

textarea.form-control {
  min-height: 120px;
  resize: vertical;
}

.error-message {
  color: var(--color-danger);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-1);
}

/* === Buttons === */

.btn {
  padding: 12px 30px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.5em;
  border: 1px solid var(--text);
  transition: all 0.4s ease;
  background-color: transparent;
  cursor: pointer;
  user-select: none;
}

button {
  background: unset;
  border: unset;
  cursor: pointer;
  color: inherit;
  -webkit-tap-highlight-color: transparent;
}

button:hover {
  color: var(--color-primary-dark);
  opacity: 0.9;
}

button:active {
  opacity: 0.7;
}

.btn:hover {
  background: var(--text);
  color: var(--bg);
  opacity: 1.0;
}

.btn:active {
  opacity: 0.7;
  transform: scale(0.98);
}

.btn-secondary {
  background-color: var(--color-secondary);
  border-color: var(--color-secondary);
}

.btn-secondary:hover {
  background-color: #5a6268;
  border-color: #545b62;
}

.btn-outline-primary {
  color: var(--color-primary);
  background-color: transparent;
  border-color: var(--color-primary);
}

.btn-outline-primary:hover {
  color: var(--color-background);
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: var(--font-size-lg);
  border-radius: var(--border-radius-lg);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: var(--font-size-sm);
  border-radius: var(--border-radius-sm);
}

.user-welcome {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-weight: 500;
}

.flex-container {
  display: flex;
  justify-content: left;
  align-items: stretch;
}

.flex-grow {
  flex-grow: 1;
}

.font-serif {
  font-family: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
}

input[type="text"]::selection,
textarea::selection {
  color: rgb(255 255 255 / 1);
  background-color: rgb(28 28 28 / 1);
}

input[type="text"],
textarea {
  font-family: 'Noto Serif JP', serif;
}