/* ============================================================
   appcrelog Design System — style.css
   @TASK P0-T0.3
   @SPEC docs/planning/05-design-system.md
   ============================================================ */

/* ------------------------------------------------------------
   1. CSS Custom Properties
   ------------------------------------------------------------ */
:root {
  /* --- Primary --- */
  --color-primary:       #6366F1;
  --color-primary-hover: #4F46E5;

  /* --- Status Colors --- */
  --color-completed:   #10B981;
  --color-in-progress: #F59E0B;
  --color-abandoned:   #6B7280;

  /* --- Neutral (Light Mode) --- */
  --color-bg:               #FFFFFF;
  --color-bg-secondary:     #F9FAFB;
  --color-border:           #E5E7EB;
  --color-text:             #111827;
  --color-text-secondary:   #6B7280;
  --color-text-muted:       #9CA3AF;

  /* --- Dark Mode Tokens (applied via @media prefers-color-scheme) --- */
  --color-bg-dark:               #0F0F0F;
  --color-bg-secondary-dark:     #1A1A1A;
  --color-border-dark:           #2D2D2D;
  --color-text-dark:             #F9FAFB;
  --color-text-secondary-dark:   #9CA3AF;

  /* --- Typography --- */
  --font-sans: 'Geist', 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Geist Mono', 'Fira Code', 'Cascadia Code', monospace;

  --text-xs:   0.75rem;    /* 12px */
  --text-sm:   0.875rem;   /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg:   1.125rem;   /* 18px */
  --text-xl:   1.25rem;    /* 20px */
  --text-2xl:  1.5rem;     /* 24px */
  --text-3xl:  1.875rem;   /* 30px */

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

  /* --- Spacing (8-point-ish grid) --- */
  --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;
  --space-16: 64px;

  /* --- Shadows --- */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.10);

  /* --- Transitions --- */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;

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

/* Dark mode: override surface/text tokens */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg:             var(--color-bg-dark);
    --color-bg-secondary:   var(--color-bg-secondary-dark);
    --color-border:         var(--color-border-dark);
    --color-text:           var(--color-text-dark);
    --color-text-secondary: var(--color-text-secondary-dark);
    --color-text-muted:     #6B7280;
  }
}

/* ------------------------------------------------------------
   2. Reset / Base
   ------------------------------------------------------------ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
video {
  display: block;
  max-width: 100%;
}

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

a:hover {
  text-decoration: underline;
}

button {
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
}

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

ul,
ol {
  list-style: none;
}

/* ------------------------------------------------------------
   3. Buttons
   ------------------------------------------------------------ */
.btn-primary,
.btn-secondary,
.btn-danger {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition:
    background-color var(--transition-fast),
    border-color     var(--transition-fast),
    color            var(--transition-fast),
    box-shadow       var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

/* Primary */
.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  text-decoration: none;
}

.btn-primary:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.35);
}

.btn-primary:active {
  background-color: #4338CA;
}

/* Secondary */
.btn-secondary {
  background-color: transparent;
  color: #374151;
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--color-bg-secondary);
  text-decoration: none;
}

.btn-secondary:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.20);
}

@media (prefers-color-scheme: dark) {
  .btn-secondary {
    color: var(--color-text);
  }
}

/* Danger */
.btn-danger {
  background-color: #FEF2F2;
  color: #DC2626;
  border-color: #FCA5A5;
}

.btn-danger:hover {
  background-color: #FEE2E2;
  text-decoration: none;
}

.btn-danger:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.25);
}

/* Disabled state (all button variants) */
.btn-primary:disabled,
.btn-secondary:disabled,
.btn-danger:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ------------------------------------------------------------
   4. Input
   ------------------------------------------------------------ */
.input {
  width: 100%;
  padding: 10px 14px;
  font-size: var(--text-sm);
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition:
    border-color var(--transition-fast),
    box-shadow   var(--transition-fast);
  outline: none;
}

.input::placeholder {
  color: var(--color-text-muted);
}

.input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.10);
}

.input.error,
.input[aria-invalid="true"] {
  border-color: #EF4444;
  box-shadow: none;
}

.input.error:focus,
.input[aria-invalid="true"]:focus {
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

.input:disabled {
  background-color: var(--color-bg-secondary);
  opacity: 0.6;
  cursor: not-allowed;
}

.input-error-message {
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  color: #DC2626;
}

/* ------------------------------------------------------------
   5. Status Badge
   ------------------------------------------------------------ */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px 10px;
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  white-space: nowrap;
}

.status-badge.completed {
  background-color: #ECFDF5;
  color: #059669;
  border-color: #A7F3D0;
}

.status-badge.in-progress {
  background-color: #FFFBEB;
  color: #D97706;
  border-color: #FCD34D;
}

.status-badge.abandoned {
  background-color: #F3F4F6;
  color: #6B7280;
  border-color: #D1D5DB;
}

/* ------------------------------------------------------------
   6. App Card
   ------------------------------------------------------------ */
.card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition:
    box-shadow    var(--transition-base),
    border-color  var(--transition-base),
    transform     var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: #D1D5DB;
  transform: translateY(-2px);
}

.card-thumbnail {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background-color: var(--color-bg-secondary);
}

.card-thumbnail-placeholder {
  width: 100%;
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-secondary);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.card-body {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-4);
  flex: 1;
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-2);
}

.card-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-text);
  line-height: 1.3;
}

.card-description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: auto;
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
}

/* ------------------------------------------------------------
   7. Tag (기술 스택)
   ------------------------------------------------------------ */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  font-family: var(--font-mono);
  color: var(--color-text-secondary);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

/* ------------------------------------------------------------
   8. App Card Grid (반응형 1 → 2 → 3열)
   ------------------------------------------------------------ */
.app-card-grid {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;          /* Mobile: 1열 */
}

@media (min-width: 640px) {
  .app-card-grid {
    grid-template-columns: repeat(2, 1fr);  /* Tablet: 2열 */
  }
}

@media (min-width: 1024px) {
  .app-card-grid {
    grid-template-columns: repeat(3, 1fr);  /* Desktop: 3열 */
  }
}

/* ------------------------------------------------------------
   9. Navbar
   ------------------------------------------------------------ */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  padding: 0 var(--space-6);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.navbar-brand {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.navbar-brand:hover {
  text-decoration: none;
  color: var(--color-primary);
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* ------------------------------------------------------------
   10. Filter Tab
   ------------------------------------------------------------ */
.filter-tab-group {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.filter-tab {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  background-color: transparent;
  border: none;
  border-radius: var(--radius-sm);
  transition:
    background-color var(--transition-fast),
    color            var(--transition-fast);
  cursor: pointer;
}

.filter-tab:hover {
  color: var(--color-text);
}

.filter-tab.active {
  background-color: var(--color-primary);
  color: #ffffff;
}

/* ------------------------------------------------------------
   11. Empty State
   ------------------------------------------------------------ */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  padding: var(--space-16) var(--space-6);
  text-align: center;
}

.empty-state-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
  background-color: var(--color-bg-secondary);
  color: var(--color-text-muted);
}

.empty-state-title {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: var(--color-text);
}

.empty-state-description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  max-width: 360px;
  line-height: 1.6;
}

/* ------------------------------------------------------------
   12. Toast (알림 메시지)
   ------------------------------------------------------------ */
#toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  border: 1px solid transparent;
  pointer-events: auto;
  min-width: 240px;
  max-width: 360px;

  /* Slide-in animation */
  animation: toast-in var(--transition-slow) ease forwards;
}

.toast.removing {
  animation: toast-out var(--transition-slow) ease forwards;
}

.toast.success {
  background-color: #ECFDF5;
  color: #065F46;
  border-color: #A7F3D0;
}

.toast.error {
  background-color: #FEF2F2;
  color: #991B1B;
  border-color: #FCA5A5;
}

.toast.info {
  background-color: #EFF6FF;
  color: #1E40AF;
  border-color: #BFDBFE;
}

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

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

/* ------------------------------------------------------------
   13. Overlay + Modal
   ------------------------------------------------------------ */
.overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  animation: overlay-in var(--transition-base) ease;
}

.overlay.hidden {
  display: none;
}

@keyframes overlay-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.modal {
  position: relative;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 520px;
  max-height: calc(100vh - var(--space-8));
  overflow-y: auto;
  animation: modal-in var(--transition-slow) ease;
}

@keyframes modal-in {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.modal-title {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: var(--color-text);
}

.modal-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.modal-close:hover {
  background-color: var(--color-bg-secondary);
  color: var(--color-text);
}

.modal-body {
  padding: var(--space-6);
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
}

/* ------------------------------------------------------------
   14. Utility Classes
   ------------------------------------------------------------ */
.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;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.text-muted {
  color: var(--color-text-secondary);
}

.text-mono {
  font-family: var(--font-mono);
}

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}