/* =============================================
   MAIN.CSS — Base Styles & Utilities
   AkalApp — Platform Pembelajaran Digital
   ============================================= */

@import url('tokens.css');

/* ================================================
   CSS RESET / NORMALIZE
   ================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
  font-size: 16px;
  line-height: var(--leading-normal);
}

body {
  min-height: 100vh;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-weight: var(--weight-regular);
  line-height: var(--leading-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, svg, video, canvas {
  display: block;
  max-width: 100%;
  height: auto;
}

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

a:hover {
  color: var(--color-blue-light);
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

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

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p {
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
}

code, pre, kbd {
  font-family: var(--font-mono);
}

/* ================================================
   CUSTOM SCROLLBAR — Dark Mode
   ================================================ */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-bg-elevated);
  border-radius: var(--radius-full);
  border: 2px solid var(--color-bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}

/* Firefox scrollbar */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--color-bg-elevated) var(--color-bg);
}

/* ================================================
   LAYOUT
   ================================================ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--sp-6);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.container--wide {
  max-width: var(--container-wide);
}

#app-root {
  min-height: 100vh;
}

/* ================================================
   UTILITY CLASSES — Flexbox
   ================================================ */
.flex           { display: flex; }
.flex-col       { display: flex; flex-direction: column; }
.flex-row       { display: flex; flex-direction: row; }
.flex-wrap      { flex-wrap: wrap; }
.flex-1         { flex: 1; }
.flex-shrink-0  { flex-shrink: 0; }

.items-center   { align-items: center; }
.items-start    { align-items: flex-start; }
.items-end      { align-items: flex-end; }
.items-stretch  { align-items: stretch; }

.justify-center { justify-content: center; }
.justify-between{ justify-content: space-between; }
.justify-end    { justify-content: flex-end; }
.justify-start  { justify-content: flex-start; }

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

/* ================================================
   UTILITY CLASSES — Grid
   ================================================ */
.grid           { display: grid; }
.grid-cols-1    { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2    { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3    { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4    { grid-template-columns: repeat(4, 1fr); }

/* ================================================
   UTILITY CLASSES — Gap
   ================================================ */
.gap-1  { gap: var(--sp-1); }
.gap-2  { gap: var(--sp-2); }
.gap-3  { gap: var(--sp-3); }
.gap-4  { gap: var(--sp-4); }
.gap-5  { gap: var(--sp-5); }
.gap-6  { gap: var(--sp-6); }
.gap-8  { gap: var(--sp-8); }
.gap-10 { gap: var(--sp-10); }
.gap-12 { gap: var(--sp-12); }
.gap-16 { gap: var(--sp-16); }

/* ================================================
   UTILITY CLASSES — Text
   ================================================ */
.text-center    { text-align: center; }
.text-left      { text-align: left; }
.text-right     { text-align: right; }
.text-sm        { font-size: var(--text-sm); }
.text-base      { font-size: var(--text-base); }
.text-lg        { font-size: var(--text-lg); }
.text-xl        { font-size: var(--text-xl); }
.text-2xl       { font-size: var(--text-2xl); }
.text-muted     { color: var(--color-text-muted); }
.text-secondary { color: var(--color-text-secondary); }
.font-medium    { font-weight: var(--weight-medium); }
.font-semibold  { font-weight: var(--weight-semibold); }
.font-bold      { font-weight: var(--weight-bold); }

/* Gradient text utility */
.text-gradient {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ================================================
   UTILITY CLASSES — Spacing
   ================================================ */
.m-0  { margin: 0; }
.mt-1 { margin-top: var(--sp-1); }
.mt-2 { margin-top: var(--sp-2); }
.mt-4 { margin-top: var(--sp-4); }
.mt-6 { margin-top: var(--sp-6); }
.mt-8 { margin-top: var(--sp-8); }
.mb-2 { margin-bottom: var(--sp-2); }
.mb-4 { margin-bottom: var(--sp-4); }
.mb-6 { margin-bottom: var(--sp-6); }
.mb-8 { margin-bottom: var(--sp-8); }

.p-2 { padding: var(--sp-2); }
.p-4 { padding: var(--sp-4); }
.p-6 { padding: var(--sp-6); }
.p-8 { padding: var(--sp-8); }

/* ================================================
   UTILITY CLASSES — Display / Visibility
   ================================================ */
.hidden     { display: none !important; }
.block      { display: block; }
.inline     { display: inline; }

/* Screen-reader only */
.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;
}

/* ================================================
   UTILITY CLASSES — Misc
   ================================================ */
.w-full     { width: 100%; }
.h-full     { height: 100%; }
.rounded    { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.overflow-hidden { overflow: hidden; }
.relative   { position: relative; }
.absolute   { position: absolute; }
.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ================================================
   RESPONSIVE BREAKPOINTS
   ================================================ */
/* Mobile-first: default styles are for mobile
   sm: 640px, md: 768px, lg: 1024px, xl: 1280px */

@media (max-width: 639px) {
  .container {
    padding-inline: var(--sp-4);
  }

  h1 { font-size: var(--text-3xl); }
  h2 { font-size: var(--text-2xl); }
  h3 { font-size: var(--text-xl); }
}

@media (min-width: 640px) {
  .sm\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  .sm\:flex-row    { flex-direction: row; }
}

@media (min-width: 768px) {
  .md\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  .md\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .md\:flex-row    { flex-direction: row; }
  .md\:hidden      { display: none !important; }
  .md\:block       { display: block !important; }
  .md\:flex        { display: flex !important; }
}

@media (min-width: 1024px) {
  .lg\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .lg\:grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
  .lg\:flex-row    { flex-direction: row; }
}

@media (min-width: 1280px) {
  .xl\:grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
}

/* ================================================
   TRANSITIONS — Global
   ================================================ */
.transition {
  transition: all var(--transition-base);
}

.transition-fast {
  transition: all var(--transition-fast);
}

.transition-slow {
  transition: all var(--transition-slow);
}