/**
 * Common CSS - Design System v2.0
 * Modern, minimal, functional design tokens and shared styles
 */

/* CSS Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Design Tokens */
:root {
  /* Primary */
  --primary: #0062CC;
  --primary-hover: #004FA3;
  --primary-pressed: #003D80;
  --primary-light: rgba(0, 98, 204, 0.08);
  --focus-ring: rgba(0, 98, 204, 0.2);

  /* Semantic */
  --success: #1E8E3E;
  --success-bg: #E6F4EA;
  --warning: #E37400;
  --warning-bg: #FEF7E0;
  --danger: #D93025;
  --danger-hover: #B3261E;
  --danger-bg: #FCE8E6;
  --info: #1A73E8;
  --info-bg: #E8F0FE;

  /* Surfaces */
  --surface: #FFFFFF;
  --bg: #F0F0EC;
  --bg-card: #FAFAF8;

  /* Text */
  --text-primary: #1A1A1A;
  --text-secondary: #6B6B6B;
  --text-tertiary: #9B9B9B;
  --text-placeholder: #BCBCBC;
  --text-caption: #ABABAB;

  /* Borders */
  --border: #E0E0DC;
  --border-light: #EBEBEB;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 50px;

  /* Shadows */
  --shadow-0: none;
  --shadow-1: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-2: 0 4px 12px rgba(0,0,0,0.08), 0 1px 4px rgba(0,0,0,0.04);
  --shadow-3: 0 8px 24px rgba(0,0,0,0.12), 0 2px 8px rgba(0,0,0,0.06);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.2s ease;
  --transition-slow: 0.3s ease;

  /* Typography */
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 2rem;      /* 32px */

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 40px;

  /* ── Backward-compatible aliases ── */
  --color-primary: var(--primary);
  --color-primary-dark: var(--primary-hover);
  --color-secondary: var(--primary-pressed);
  --color-background: var(--bg);
  --color-surface: var(--surface);
  --color-text-primary: var(--text-primary);
  --color-text-secondary: var(--text-secondary);
  --color-border: var(--border);
  --color-error: var(--danger);
  --color-success: var(--success);

  --shadow-sm: var(--shadow-1);
  --shadow-md: var(--shadow-2);
  --shadow-lg: var(--shadow-3);
  --shadow-xl: var(--shadow-3);

  --transition-base: var(--transition-normal);
  --radius-xl: var(--radius-lg);
}

/* ── Dark Theme ── */
[data-theme="dark"] {
  /* Primary */
  --primary: #4D9AFF;
  --primary-hover: #3A87F0;
  --primary-pressed: #2B74D9;
  --primary-light: rgba(77, 154, 255, 0.12);
  --focus-ring: rgba(77, 154, 255, 0.3);

  /* Semantic */
  --success: #4CAF50;
  --success-bg: rgba(76, 175, 80, 0.15);
  --warning: #FFB74D;
  --warning-bg: rgba(255, 183, 77, 0.15);
  --danger: #EF5350;
  --danger-hover: #E53935;
  --danger-bg: rgba(239, 83, 80, 0.15);
  --info: #42A5F5;
  --info-bg: rgba(66, 165, 245, 0.15);

  /* Surfaces */
  --surface: #1E1E2E;
  --bg: #13131D;
  --bg-card: #252538;

  /* Text */
  --text-primary: #E4E4EF;
  --text-secondary: #9B9BB0;
  --text-tertiary: #8E8EA0;
  --text-placeholder: #55556A;
  --text-caption: #6B6B80;

  /* Borders */
  --border: #2E2E42;
  --border-light: #262638;

  /* Shadows */
  --shadow-1: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-2: 0 4px 12px rgba(0, 0, 0, 0.35), 0 1px 4px rgba(0, 0, 0, 0.2);
  --shadow-3: 0 8px 24px rgba(0, 0, 0, 0.4), 0 2px 8px rgba(0, 0, 0, 0.25);

  /* Backward-compatible aliases */
  --color-primary: var(--primary);
  --color-primary-dark: var(--primary-hover);
  --color-secondary: var(--primary-pressed);
  --color-background: var(--bg);
  --color-surface: var(--surface);
  --color-text-primary: var(--text-primary);
  --color-text-secondary: var(--text-secondary);
  --color-border: var(--border);
  --color-error: var(--danger);
  --color-success: var(--success);

  --shadow-sm: var(--shadow-1);
  --shadow-md: var(--shadow-2);
  --shadow-lg: var(--shadow-3);
  --shadow-xl: var(--shadow-3);

  color-scheme: dark;
}

/* Skip Navigation Link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--spacing-md);
  z-index: 10000;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--primary);
  color: #fff;
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.skip-link:focus {
  top: var(--spacing-sm);
  opacity: 1;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Body */
body {
  font-family: 'Pretendard Variable', Pretendard, -apple-system, 'Helvetica Neue', system-ui, sans-serif;
  background-color: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Links */
a {
  color: inherit;
  text-decoration: none;
}

/* Buttons */
button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.35;
}

/* Material Icons */
.material-icons {
  vertical-align: middle;
}

/* Utility Classes */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

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

.hidden {
  display: none !important;
}

/* Screen reader only (visually hidden) */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Loading Spinner */
.spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl) 0;
}

.spinner__icon {
  width: 48px;
  height: 48px;
  border: 3px solid var(--border-light);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spinner-rotate 0.8s linear infinite;
}

.spinner__text {
  margin-top: var(--spacing-md);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

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

/* Loading Overlay */
.loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

[data-theme="dark"] .loading-overlay {
  background: rgba(19, 19, 29, 0.85);
}

[data-theme="dark"] .header__button:active {
  background-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .confirm-overlay {
  background: rgba(0, 0, 0, 0.65);
}

/* Header Component */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  padding: 0 var(--spacing-sm);
  background-color: var(--surface);
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header__left {
  display: flex;
  align-items: center;
  min-width: 48px;
  z-index: 1;
}

.header__center {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  max-width: calc(100% - 200px);
  text-align: center;
  pointer-events: none;
}

.header__right {
  display: flex;
  align-items: center;
  min-width: 48px;
  justify-content: flex-end;
  z-index: 1;
}

.header__title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.header__button {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  color: var(--text-primary);
  transition: background-color var(--transition-normal);
}

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

.header__button:active {
  background-color: rgba(0, 0, 0, 0.08);
}

.header__button .material-icons {
  font-size: 24px;
}

.header__button--badge {
  position: relative;
}

.header__badge {
  position: absolute;
  top: 4px;
  right: 4px;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  font-size: 11px;
  font-weight: 600;
  line-height: 18px;
  text-align: center;
  color: var(--surface);
  background-color: var(--danger);
  border-radius: 9px;
}

/* Header Logo (home) */
.header__logo {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}

.header__logo .material-icons {
  font-size: 28px;
}

/* Hamburger Button */
.header__hamburger {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  color: var(--text-primary);
  position: relative;
  transition: background-color var(--transition-normal);
}

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

.header__hamburger:active {
  background-color: rgba(0, 0, 0, 0.08);
}

.header__hamburger .material-icons {
  font-size: 24px;
}

/* Unread notification dot on hamburger */
.header__hamburger-dot {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 8px;
  height: 8px;
  background: var(--danger);
  border-radius: 50%;
  border: 2px solid var(--surface);
}

/* Menu Backdrop */
.header-menu-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0);
  z-index: 200;
  transition: background 0.25s ease;
}

.header-menu-backdrop--visible {
  background: rgba(0, 0, 0, 0.4);
}

/* Menu Panel — desktop: dropdown, mobile: side sheet */
.header-menu {
  position: fixed;
  z-index: 201;
  background: var(--surface);
  overflow-y: auto;
  /* Mobile: right side sheet */
  top: 0;
  right: 0;
  width: 70%;
  max-width: 320px;
  height: 100vh;
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
  box-shadow: var(--shadow-3);
  padding: var(--spacing-lg) 0 var(--spacing-md);
  transform: translateX(100%);
  transition: transform 0.25s ease-out;
}

.header-menu--visible {
  transform: translateX(0);
}

/* Desktop: dropdown style */
@media (min-width: 768px) {
  .header-menu {
    top: 56px;
    right: 16px;
    width: 280px;
    height: auto;
    max-height: calc(100vh - 72px);
    border-radius: var(--radius-lg);
    padding: var(--spacing-sm) 0;
    transform: none;
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 0.2s ease, transform 0.2s ease;
  }

  .header-menu--visible {
    opacity: 1;
    transform: scale(1);
  }
}

/* Menu Items */
.header-menu__item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  height: 48px;
  padding: 0 var(--spacing-lg);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  font-weight: 400;
  cursor: pointer;
  transition: background var(--transition-fast);
  text-decoration: none;
  border: none;
  background: transparent;
  width: 100%;
  font-family: inherit;
}

.header-menu__item:hover {
  background: var(--primary-light);
}

.header-menu__item--active {
  color: var(--primary);
  font-weight: 500;
}

.header-menu__item .material-icons {
  font-size: 22px;
  flex-shrink: 0;
}

/* Notification badge inside menu */
.header-menu__badge {
  margin-left: auto;
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  font-size: 11px;
  font-weight: 600;
  line-height: 20px;
  text-align: center;
  color: #fff;
  background: var(--danger);
  border-radius: 10px;
}

/* Divider */
.header-menu__divider {
  height: 1px;
  background: var(--border-light);
  margin: var(--spacing-xs) var(--spacing-lg);
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  .header-menu,
  .header-menu-backdrop {
    transition-duration: 0.01ms !important;
  }
}

[data-theme="dark"] .header__hamburger:active {
  background-color: rgba(255, 255, 255, 0.08);
}

/* Focus visible for accessibility */
:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--focus-ring);
}

/* Responsive */
@media (max-width: 767px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .container {
    padding: 0 var(--spacing-md);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--spacing-lg);
  }
}

/* Confirm Dialog */
.confirm-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.15s ease;
}
.confirm-dialog {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-3);
  padding: 24px;
  width: 90%;
  max-width: 380px;
  animation: slideUp 0.2s ease;
}
.confirm-dialog__title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.confirm-dialog__message {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
}
.confirm-dialog__buttons {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}
.confirm-dialog__btn {
  padding: 9px 20px;
  font-size: 13px;
  font-weight: 500;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-family: inherit;
  border: 1.5px solid transparent;
  transition: background var(--transition-fast);
}
.confirm-dialog__btn--cancel {
  background: transparent;
  color: var(--text-secondary);
  border-color: var(--border);
}
.confirm-dialog__btn--cancel:hover { background: var(--bg-card); }
.confirm-dialog__btn--confirm {
  background: var(--primary);
  color: #fff;
}
.confirm-dialog__btn--confirm:hover { background: var(--primary-hover); }
.confirm-dialog__btn--danger { background: var(--danger); }
.confirm-dialog__btn--danger:hover { background: var(--danger-hover); }

/* Report Dialog */
.report-dialog { max-width: 420px; }
.report-dialog__reasons {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 16px;
}
.report-dialog__reason {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-primary);
  cursor: pointer;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}
.report-dialog__reason:hover { background: var(--bg-card); }
.report-dialog__reason input[type="radio"] { accent-color: var(--primary); }
.report-dialog__detail {
  width: 100%;
  padding: 10px 12px;
  font-size: 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  font-family: inherit;
  resize: vertical;
  min-height: 72px;
  margin-bottom: 16px;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.report-dialog__detail:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }

/* Image Placeholder (이미지 로드 실패 시 대체) */
.image-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  min-height: 60px;
  background-color: var(--bg-card);
  border-radius: var(--radius-md);
  color: var(--text-tertiary);
}

.image-placeholder .material-icons {
  font-size: 32px;
}

@media (hover: none) and (pointer: coarse) {
  .podium-item:hover,
  .game-card:hover,
  .trending-card:hover,
  .faq-question:hover,
  .post-card:hover {
    transform: none !important;
  }
}

/* Skeleton Loading */
.skeleton {
  background: var(--bg-secondary, #f0f0f0);
  border-radius: 8px;
  position: relative;
  overflow: hidden;
}

.skeleton::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  animation: skeleton-shimmer 1.5s infinite;
}

@keyframes skeleton-shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

[data-theme="dark"] .skeleton {
  background: var(--bg-tertiary, #2a2a3e);
}

[data-theme="dark"] .skeleton::after {
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.08), transparent);
}

.skeleton-text {
  height: 14px;
  margin-bottom: 8px;
}

.skeleton-text--title {
  height: 20px;
  width: 60%;
}

.skeleton-image {
  aspect-ratio: 2/1;
  width: 100%;
}

.skeleton-card {
  padding: var(--spacing-md, 16px);
}

/* Toast Notifications */
.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  padding: 12px 24px;
  border-radius: 8px;
  color: white;
  font-size: 14px;
  font-weight: 500;
  z-index: 10000;
  opacity: 0;
  transition: opacity 0.3s;
}

.toast--error {
  background-color: var(--color-error, #D32F2F);
}

.toast--success {
  background-color: var(--color-success, #388E3C);
}

.toast--info {
  background-color: var(--color-primary, #018ABE);
}