/* =========================================================
   KSK DESIGN SYSTEM
   मेरो संसार — Shared UI Foundation
   Version: 3.0
   Architecture: Single Design System
   Responsibility:
   Design Tokens, Themes, Typography, Utilities,
   Shared Components, Accessibility
========================================================= */


/* =========================================================
   01. DESIGN TOKENS — LIGHT THEME
========================================================= */

:root {
  color-scheme: light;

  /* Brand */
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-soft: #eff6ff;
  --color-primary-rgb: 37, 99, 235;

  /* Background */
  --color-background: #f4f7fb;
  --color-surface: #ffffff;
  --color-surface-secondary: #f8fafc;
  --color-surface-hover: #f1f5f9;

  /* Text */
  --color-text: #172033;
  --color-text-secondary: #475569;
  --color-muted: #64748b;
  --color-placeholder: #94a3b8;

  /* Borders */
  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;

  /* Status */
  --color-danger: #dc2626;
  --color-danger-soft: #fef2f2;

  --color-success: #15803d;
  --color-success-soft: #f0fdf4;

  --color-warning: #d97706;
  --color-warning-soft: #fffbeb;

  --color-info: #0284c7;
  --color-info-soft: #f0f9ff;

  /* Spacing */
  --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;

  /* Radius */
  --radius-xs: 5px;
  --radius-sm: 8px;
  --radius-md: 13px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-2xl: 30px;
  --radius-pill: 999px;

  /* Shadows */
  --shadow-xs: 0 1px 3px rgba(15, 23, 42, .04);
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, .05);
  --shadow-md: 0 5px 18px rgba(15, 23, 42, .08);
  --shadow-lg: 0 15px 45px rgba(0, 0, 0, .15);

  /* Typography */
  --font-main: "Noto Sans Devanagari", system-ui, sans-serif;

  --font-size-xs: 11px;
  --font-size-sm: 12px;
  --font-size-base: 14px;
  --font-size-md: 15px;
  --font-size-lg: 18px;
  --font-size-xl: 22px;
  --font-size-2xl: 28px;

  /* Shared Layout */
  --header-height: 64px;
  --nav-height: 68px;
  --content-width: 760px;
  --sidebar-width: 280px;

  /* Animation */
  --transition-fast: .15s ease;
  --transition-normal: .2s ease;
  --transition-slow: .3s ease;

  /* Layers */
  --z-header: 100;
  --z-dropdown: 200;
  --z-modal: 1000;
  --z-toast: 1100;

  /* Focus */
  --focus-ring: 0 0 0 3px rgba(var(--color-primary-rgb), .18);
}


/* =========================================================
   02. DARK THEME
========================================================= */

html[data-theme="dark"] {
  color-scheme: dark;

  --color-primary: #60a5fa;
  --color-primary-hover: #93c5fd;
  --color-primary-soft: #172e50;
  --color-primary-rgb: 96, 165, 250;

  --color-background: #0b1220;
  --color-surface: #111c2e;
  --color-surface-secondary: #172438;
  --color-surface-hover: #1e2d43;

  --color-text: #e5edf8;
  --color-text-secondary: #cbd5e1;
  --color-muted: #9aa9bd;
  --color-placeholder: #718096;

  --color-border: #26364d;
  --color-border-strong: #3b4c64;

  --color-danger: #f87171;
  --color-danger-soft: #3b1d27;

  --color-success: #4ade80;
  --color-success-soft: #153525;

  --color-warning: #fbbf24;
  --color-warning-soft: #392e16;

  --color-info: #38bdf8;
  --color-info-soft: #142f42;

  --shadow-xs: 0 1px 3px rgba(0, 0, 0, .12);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, .16);
  --shadow-md: 0 5px 18px rgba(0, 0, 0, .22);
  --shadow-lg: 0 15px 45px rgba(0, 0, 0, .35);
}


/* =========================================================
   03. GLOBAL RESET
========================================================= */

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

html {
  min-height: 100%;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--color-background);
  color: var(--color-text);
  font-family: var(--font-main);
  font-size: var(--font-size-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;

  transition:
    background-color var(--transition-normal),
    color var(--transition-normal);
}

button,
input,
textarea,
select {
  font: inherit;
}

button {
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

button:disabled {
  opacity: .55;
  cursor: not-allowed;
}

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

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

a:hover {
  text-decoration: none;
}

.hidden,
[hidden] {
  display: none !important;
}


/* =========================================================
   04. TYPOGRAPHY
========================================================= */

h1,
h2,
h3,
h4,
h5,
h6 {
  margin-top: 0;
  color: var(--color-text);
  line-height: 1.35;
}

p {
  margin-top: 0;
}

.text-primary {
  color: var(--color-primary) !important;
}

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

.text-danger {
  color: var(--color-danger) !important;
}

.text-success {
  color: var(--color-success) !important;
}

.text-small {
  font-size: var(--font-size-sm);
}

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

.section-title {
  margin: 0 0 var(--space-3);
  color: var(--color-text);
  font-size: var(--font-size-lg);
  font-weight: 800;
}


/* =========================================================
   05. COMMON LAYOUT UTILITIES
========================================================= */

.container {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

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

.gap-1 {
  gap: var(--space-1);
}

.gap-2 {
  gap: var(--space-2);
}

.gap-3 {
  gap: var(--space-3);
}

.gap-4 {
  gap: var(--space-4);
}

.w-full {
  width: 100%;
}


/* =========================================================
   06. SHARED CARDS
   Page-specific card layouts belong to app.css
========================================================= */

.card {
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow-sm);

  transition:
    background var(--transition-normal),
    border-color var(--transition-normal),
    box-shadow var(--transition-normal);
}

.card-hover:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-md);
}


/* =========================================================
   07. SHARED BUTTON SYSTEM
========================================================= */

.btn {
  min-height: 40px;
  padding: 8px 16px;

  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);

  border: 1px solid transparent;
  border-radius: var(--radius-pill);

  font-size: var(--font-size-base);
  font-weight: 700;
  line-height: 1.4;

  transition:
    background var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast);
}

.btn:active {
  transform: scale(.97);
}

.btn-primary {
  background: var(--color-primary);
  color: #ffffff;
}

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

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

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

.btn-danger {
  background: var(--color-danger);
  color: #ffffff;
}

.btn-success {
  background: var(--color-success);
  color: #ffffff;
}

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

.btn-ghost:hover {
  background: var(--color-surface-hover);
}

.btn-sm {
  min-height: 32px;
  padding: 5px 12px;
  font-size: var(--font-size-sm);
}

.btn-lg {
  min-height: 48px;
  padding: 12px 22px;
}

.btn-block {
  width: 100%;
}


/* =========================================================
   08. SHARED ICON BUTTONS
========================================================= */

.icon-button {
  width: 40px;
  height: 40px;
  padding: 0;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  border: 1px solid transparent;
  border-radius: 50%;

  background: transparent;
  color: var(--color-text-secondary);

  font-size: 20px;

  transition:
    background var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast);
}

.icon-button:hover {
  background: var(--color-surface-hover);
  color: var(--color-primary);
}

.icon-button-sm {
  width: 32px;
  height: 32px;
  font-size: 16px;
}


/* =========================================================
   09. SHARED INPUT SYSTEM
========================================================= */

.form-input,
.form-textarea,
.input-field,
select {
  width: 100%;
  min-height: 42px;
  padding: 10px 13px;

  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);

  outline: none;
  background: var(--color-surface);
  color: var(--color-text);

  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.form-input::placeholder,
.form-textarea::placeholder,
.input-field::placeholder {
  color: var(--color-placeholder);
}

.form-input:focus,
.form-textarea:focus,
.input-field:focus,
select:focus {
  border-color: var(--color-primary);
  box-shadow: var(--focus-ring);
}

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

.form-label {
  display: block;
  margin-bottom: var(--space-2);
  color: var(--color-text);
  font-weight: 700;
}

.form-group {
  margin-bottom: var(--space-4);
}


/* =========================================================
   10. SHARED AVATAR
========================================================= */

.avatar {
  width: 42px;
  height: 42px;
  flex: 0 0 42px;

  display: grid;
  place-items: center;
  overflow: hidden;

  border: 1px solid var(--color-border);
  border-radius: 50%;

  background: var(--color-primary-soft);
  color: var(--color-primary);

  font-weight: 800;
}

.avatar img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.avatar-sm {
  width: 32px;
  height: 32px;
  flex-basis: 32px;
}

.avatar-lg {
  width: 56px;
  height: 56px;
  flex-basis: 56px;
}

.avatar-xl {
  width: 90px;
  height: 90px;
  flex-basis: 90px;
}


/* =========================================================
   11. SHARED BADGES
========================================================= */

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;

  padding: 3px 9px;
  border-radius: var(--radius-pill);

  background: var(--color-surface-secondary);
  color: var(--color-text-secondary);

  font-size: var(--font-size-xs);
  font-weight: 700;
}

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

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

.badge-danger {
  background: var(--color-danger-soft);
  color: var(--color-danger);
}


/* =========================================================
   12. DIVIDERS
========================================================= */

.divider {
  width: 100%;
  height: 1px;
  margin-block: var(--space-4);
  border: 0;
  background: var(--color-border);
}


/* =========================================================
   13. SHARED DROPDOWN
========================================================= */

.dropdown-menu {
  position: absolute;
  z-index: var(--z-dropdown);

  min-width: 180px;
  padding: var(--space-2);

  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);

  background: var(--color-surface);
  box-shadow: var(--shadow-md);
}

.dropdown-item {
  width: 100%;
  padding: 10px 12px;

  display: flex;
  align-items: center;
  gap: var(--space-2);

  border: 0;
  border-radius: var(--radius-sm);

  background: transparent;
  color: var(--color-text);

  text-align: left;
  cursor: pointer;
}

.dropdown-item:hover {
  background: var(--color-surface-hover);
}


/* =========================================================
   14. SHARED MODAL SYSTEM
========================================================= */

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);

  display: flex;
  align-items: center;
  justify-content: center;

  padding: var(--space-4);

  background: rgba(0, 0, 0, .55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);

  animation: ksk-fade-in .18s ease;
}

.modal {
  width: 100%;
  max-width: 500px;
  max-height: min(85vh, 760px);

  display: flex;
  flex-direction: column;
  overflow: hidden;

  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);

  background: var(--color-surface);
  color: var(--color-text);

  box-shadow: var(--shadow-lg);

  animation: ksk-modal-in .2s ease;
}

.modal-header {
  min-height: 58px;
  padding: 12px 18px;

  display: flex;
  align-items: center;
  justify-content: space-between;

  border-bottom: 1px solid var(--color-border);
}

.modal-title {
  margin: 0;
  font-size: var(--font-size-lg);
  font-weight: 800;
}

.modal-body {
  min-height: 0;
  padding: var(--space-4);
  overflow-y: auto;
  overscroll-behavior: contain;
}

.modal-footer {
  padding: 12px 18px;

  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);

  border-top: 1px solid var(--color-border);
}


/* =========================================================
   15. SHARED TOAST SYSTEM
========================================================= */

#toastContainer {
  position: fixed;
  z-index: var(--z-toast);

  top: 20px;
  right: 20px;

  width: min(360px, calc(100% - 32px));

  display: flex;
  flex-direction: column;
  gap: var(--space-2);

  pointer-events: none;
}

.toast {
  padding: 13px 16px;

  display: flex;
  align-items: center;
  gap: var(--space-2);

  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-info);
  border-radius: var(--radius-md);

  background: var(--color-surface);
  color: var(--color-text);

  box-shadow: var(--shadow-md);

  pointer-events: auto;
  animation: ksk-toast-in .2s ease;
}

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

.toast-error {
  border-left-color: var(--color-danger);
}

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

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

.toast-hiding {
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity .2s ease, transform .2s ease;
}


/* =========================================================
   16. SHARED EMPTY STATES
========================================================= */

.empty-state {
  padding: var(--space-8) var(--space-4);
  color: var(--color-muted);
  text-align: center;
}

.empty-state-icon {
  margin-bottom: var(--space-3);
  font-size: 38px;
}

.empty-state-title {
  margin-bottom: var(--space-2);
  color: var(--color-text);
  font-size: var(--font-size-lg);
  font-weight: 800;
}


/* =========================================================
   17. SHARED LOADING STATES
========================================================= */

.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-6);
  color: var(--color-muted);
}

.spinner {
  width: 22px;
  height: 22px;

  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;

  animation: ksk-spin .7s linear infinite;
}


/* =========================================================
   18. SCROLLBAR
========================================================= */

* {
  scrollbar-width: thin;
  scrollbar-color: var(--color-border-strong) transparent;
}

::-webkit-scrollbar {
  width: 7px;
  height: 7px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  border-radius: var(--radius-pill);
  background: var(--color-border-strong);
}


/* =========================================================
   19. ACCESSIBILITY
========================================================= */

button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

::selection {
  background: var(--color-primary-soft);
  color: var(--color-text);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}


/* =========================================================
   20. SHARED ANIMATIONS
========================================================= */

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

@keyframes ksk-fade-in {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes ksk-modal-in {
  from {
    opacity: 0;
    transform: translateY(12px) scale(.98);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes ksk-toast-in {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}


/* =========================================================
   21. RESPONSIVE FOUNDATION
========================================================= */

@media (max-width: 600px) {

  :root {
    --header-height: 58px;
    --nav-height: 62px;
  }

  body {
    font-size: 13px;
  }

  .container {
    padding-inline: 12px;
  }

  .card {
    padding: 13px;
  }

  .modal-backdrop {
    padding: 10px;
  }

  .modal {
    max-height: 90vh;
    border-radius: var(--radius-lg);
  }

  .modal-header {
    padding: 10px 14px;
  }

  .modal-body {
    padding: 14px;
  }

  .modal-footer {
    padding: 10px 14px;
  }

  #toastContainer {
    top: 12px;
    right: 12px;
    width: calc(100% - 24px);
  }
}


/* =========================================================
   END — KSK SHARED DESIGN SYSTEM
========================================================= */