/* ============================================================================
 * 토칼리 (Tocally) - Toss Design System (TDS) 기반 스타일시트
 * ============================================================================ */

/* ============================================================================
 * 1. CSS Variables & Theme
 * ============================================================================ */

:root {
  /* Primary Colors */
  --color-primary: #0066ff;      /* Toss Blue */
  --color-primary-light: #e8f0ff;
  --color-primary-dark: #0052cc;

  /* Secondary Colors */
  --color-secondary: #00c896;    /* Toss Green */
  --color-secondary-light: #e8f9f3;
  --color-secondary-dark: #009a7a;

  /* Status Colors */
  --color-success: #00c896;
  --color-error: #ff6b6b;
  --color-warning: #ffa500;
  --color-info: #0066ff;

  /* Neutral Colors */
  --color-white: #ffffff;
  --color-black: #000000;
  --color-gray-50: #f8f9fa;
  --color-gray-100: #f1f3f5;
  --color-gray-200: #e9ecef;
  --color-gray-300: #dee2e6;
  --color-gray-400: #ced4da;
  --color-gray-500: #adb5bd;
  --color-gray-600: #868e96;
  --color-gray-700: #495057;
  --color-gray-800: #212529;
  --color-gray-900: #000000;

  /* Typography */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', 'Noto Sans KR', sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 32px;

  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Line Height */
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-lg: 16px;
  --spacing-xl: 24px;
  --spacing-2xl: 32px;
  --spacing-3xl: 48px;

  /* Border Radius */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 16px 32px rgba(0, 0, 0, 0.2);

  /* Z-index */
  --z-base: 1;
  --z-dropdown: 100;
  --z-modal: 1000;
  --z-tooltip: 1001;
  --z-notification: 1100;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1a1a1a;
    --color-fg: #ffffff;
    --color-border: #333333;
  }
}

/* ============================================================================
 * 2. Reset & Base Styles
 * ============================================================================ */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-gray-800);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================================================
 * 3. Typography
 * ============================================================================ */

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-size-3xl);
}

h2 {
  font-size: var(--font-size-2xl);
}

h3 {
  font-size: var(--font-size-xl);
}

h4 {
  font-size: var(--font-size-lg);
}

h5 {
  font-size: var(--font-size-base);
}

h6 {
  font-size: var(--font-size-sm);
}

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* ============================================================================
 * 4. Forms
 * ============================================================================ */

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="tel"],
input[type="search"],
textarea,
select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
input[type="tel"]:focus,
input[type="search"]:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

input[type="text"]::placeholder,
input[type="email"]::placeholder,
input[type="password"]::placeholder,
input[type="number"]::placeholder,
input[type="tel"]::placeholder,
input[type="search"]::placeholder,
textarea::placeholder {
  color: var(--color-gray-500);
}

label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-700);
}

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

.form-error {
  color: var(--color-error);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
}

.form-help {
  color: var(--color-gray-500);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
}

/* ============================================================================
 * 5. Buttons
 * ============================================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-normal);
  text-align: center;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

/* Primary Button */
.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.btn-primary:disabled {
  background-color: var(--color-gray-300);
  cursor: not-allowed;
  opacity: 0.6;
}

/* Secondary Button */
.btn-secondary {
  background-color: var(--color-gray-100);
  color: var(--color-gray-800);
}

.btn-secondary:hover {
  background-color: var(--color-gray-200);
}

/* Success Button */
.btn-success {
  background-color: var(--color-success);
  color: var(--color-white);
}

.btn-success:hover {
  background-color: var(--color-secondary-dark);
}

/* Outline Button */
.btn-outline {
  border: 1px solid var(--color-primary);
  background-color: transparent;
  color: var(--color-primary);
}

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

/* Text Button */
.btn-text {
  background-color: transparent;
  color: var(--color-primary);
  padding: var(--spacing-xs) 0;
}

.btn-text:hover {
  color: var(--color-primary-dark);
}

/* Size Variants */
.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
}

/* Full Width */
.btn-block {
  width: 100%;
}

/* Loading State */
.btn:disabled,
.btn.loading {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ============================================================================
 * 6. Cards
 * ============================================================================ */

.card {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-gray-200);
}

.card-body {
  margin-bottom: var(--spacing-md);
}

.card-footer {
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-gray-200);
  display: flex;
  gap: var(--spacing-md);
}

/* ============================================================================
 * 7. Navigation
 * ============================================================================ */

.navbar {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  padding: var(--spacing-md) var(--spacing-lg);
  position: sticky;
  top: 0;
  z-index: var(--z-dropdown);
  box-shadow: var(--shadow-sm);
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
}

.navbar-brand {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  text-decoration: none;
}

.navbar-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-xl);
}

.navbar-menu a {
  color: var(--color-gray-700);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
}

.navbar-menu a:hover,
.navbar-menu a.active {
  color: var(--color-primary);
}

/* Mobile Menu Icon */
.navbar-toggle {
  display: none;
  background: none;
  border: none;
  font-size: var(--font-size-xl);
  cursor: pointer;
  color: var(--color-gray-700);
}

/* ============================================================================
 * 8. Alerts & Toast
 * ============================================================================ */

.alert {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.alert-success {
  background-color: var(--color-secondary-light);
  color: var(--color-secondary-dark);
  border: 1px solid var(--color-secondary);
}

.alert-error {
  background-color: #ffe6e6;
  color: var(--color-error);
  border: 1px solid var(--color-error);
}

.alert-warning {
  background-color: #fff0e6;
  color: #cc6600;
  border: 1px solid var(--color-warning);
}

.alert-info {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

/* Toast (임시 알림) */
.toast-container {
  position: fixed;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: var(--z-notification);
  pointer-events: none;
}

.toast {
  background-color: var(--color-gray-800);
  color: var(--color-white);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  animation: slideIn 300ms ease-out;
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.toast.success {
  background-color: var(--color-success);
}

.toast.error {
  background-color: var(--color-error);
}

.toast.warning {
  background-color: var(--color-warning);
}

.toast.info {
  background-color: var(--color-info);
}

/* ============================================================================
 * 8. Header & Navigation
 * ============================================================================ */

.header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  sticky: top;
  top: 0;
  z-index: var(--z-dropdown);
  box-shadow: var(--shadow-xs);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: var(--spacing-lg);
}

.header-logo {
  flex-shrink: 0;
}

.header-logo a {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-xl);
  color: var(--color-primary);
}

.logo-icon {
  font-size: 24px;
}

.logo-text {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-nav {
  flex: 1;
  display: none;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  margin: 0;
  padding: 0;
}

.nav-link {
  color: var(--color-gray-700);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background-color: var(--color-gray-100);
  color: var(--color-gray-800);
  text-decoration: none;
  font-size: 18px;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.btn-icon:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.btn-primary-sm,
.btn-secondary-sm {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  border: none;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary-sm {
  background-color: var(--color-primary);
  color: white;
}

.btn-primary-sm:hover {
  background-color: var(--color-primary-dark);
}

.btn-secondary-sm {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn-secondary-sm:hover {
  background-color: var(--color-primary-light);
}

/* Main Content */
.main-content {
  min-height: calc(100vh - 64px - 200px); /* header - footer */
  padding: var(--spacing-xl) 0;
}

/* Responsive Header */
@media (min-width: 768px) {
  .header-nav {
    display: block;
  }
}

/* ============================================================================
 * 9. Modals
 * ============================================================================ */

/* Modal: 중앙 완벽 정렬 */
.modal-overlay {
  position: fixed;
  inset: 0;  /* top, right, bottom, left 동시 설정 */
  background-color: rgba(0, 0, 0, 0.5);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;     /* 세로 중앙 */
  justify-content: center; /* 가로 중앙 */
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  max-width: 500px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  animation: modalSlide 300ms ease-out;
  margin: auto;  /* 확실한 중앙 정렬 */
}

@keyframes modalSlide {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-body {
  padding: var(--spacing-lg);
}

.modal-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--color-gray-200);
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
}

/* ============================================================================
 * 10. Containers & Layout
 * ============================================================================ */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-sm {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-md {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
  margin: calc(var(--spacing-lg) * -1);
}

.col {
  flex: 1;
  min-width: 0;
  padding: var(--spacing-lg);
}

.col-12 { width: calc(100% - var(--spacing-lg)); }
.col-6 { width: calc(50% - var(--spacing-lg)); }
.col-4 { width: calc(33.333% - var(--spacing-lg)); }
.col-3 { width: calc(25% - var(--spacing-lg)); }

/* ============================================================================
 * 11. Utilities
 * ============================================================================ */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--color-primary); }
.text-success { color: var(--color-success); }
.text-error { color: var(--color-error); }
.text-warning { color: var(--color-warning); }
.text-muted { color: var(--color-gray-500); }

.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }

.font-light { font-weight: var(--font-weight-light); }
.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

.mt-xs { margin-top: var(--spacing-xs); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.p-lg { padding: var(--spacing-lg); }
.p-xl { padding: var(--spacing-xl); }

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-full { border-radius: var(--radius-full); }

.shadow { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

.hidden { display: none !important; }
.show { display: block !important; }

.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }

/* ============================================================================
 * 12. Responsive Design
 * ============================================================================ */

@media (max-width: 768px) {
  :root {
    --font-size-3xl: 28px;
    --font-size-2xl: 22px;
    --font-size-xl: 18px;
    --font-size-lg: 16px;
    --font-size-base: 14px;
  }

  .navbar-menu {
    display: none;
  }

  .navbar-toggle {
    display: block;
  }

  .col-6 { width: calc(100% - var(--spacing-lg)); }
  .col-4 { width: calc(50% - var(--spacing-lg)); }
  .col-3 { width: calc(100% - var(--spacing-lg)); }

  .card {
    padding: var(--spacing-md);
  }

  .modal {
    width: 95%;
    max-height: 90vh;
  }
}

@media (max-width: 480px) {
  .navbar-container {
    gap: var(--spacing-md);
  }

  .card {
    padding: var(--spacing-md);
  }

  .btn {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .btn-lg {
    padding: var(--spacing-sm) var(--spacing-lg);
  }
}

/* ============================================================================
 * 13. Loading & Animation
 * ============================================================================ */

.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--color-gray-200);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.loader {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.loader-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-primary);
  animation: bounce 1.4s infinite;
}

.loader-dot:nth-child(1) {
  animation-delay: -0.32s;
}

.loader-dot:nth-child(2) {
  animation-delay: -0.16s;
}

@keyframes bounce {
  0%, 80%, 100% {
    opacity: 0.3;
    transform: scale(0.8);
  }
  40% {
    opacity: 1;
    transform: scale(1.2);
  }
}

/* ============================================================================
 * 14. Status Badges
 * ============================================================================ */

.badge {
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding: 0 var(--spacing-sm);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  white-space: nowrap;
}

.badge-primary {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.badge-success {
  background-color: var(--color-secondary-light);
  color: var(--color-secondary);
}

.badge-error {
  background-color: #ffe6e6;
  color: var(--color-error);
}

.badge-warning {
  background-color: #fff0e6;
  color: #cc6600;
}

/* ============================================================================
 * 15. Footer
 * ============================================================================ */

.footer {
  background-color: var(--color-gray-50);
  border-top: 1px solid var(--color-gray-200);
  padding: var(--spacing-2xl) var(--spacing-lg);
  margin-top: var(--spacing-3xl);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  color: var(--color-primary);
}

.footer-description {
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
  margin: 0;
}

.footer-title {
  margin: 0 0 var(--spacing-md) 0;
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-gray-800);
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
}

.footer-section {
  display: flex;
  flex-direction: column;
}

.footer-section a {
  display: block;
  color: var(--color-gray-600);
  text-decoration: none;
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-sm);
  transition: color var(--transition-fast);
}

.footer-section a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  text-align: center;
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--color-gray-200);
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}