/* ==========================================================================
   PEN 11 DESIGN SYSTEM - 01-LAYOUT.CSS
   Adaptive Layout, Breakpoints, Navigation Bars/Rails/Drawers & Bento Grids
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Modern Reset & Box Model
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
  overflow-x: hidden; /* prevent any element from causing horizontal page gap */
}

body {
  font-family: var(--md-sys-typescale-font-plain);
  background-color: var(--md-sys-color-background);
  color: var(--md-sys-color-on-background);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
  transition: background-color var(--md-sys-motion-duration-medium2) var(--md-sys-motion-easing-standard),
              color var(--md-sys-motion-duration-medium2) var(--md-sys-motion-easing-standard);
}

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

a {
  color: inherit;
  text-decoration: none;
}

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

/* --- Ambient Topographic Silky Waves Background Layer --- */
.m3-ambient-waves-bg {
  position: fixed;
  inset: 0; /* covers all edges — width/height: 100vw/vh not needed and 100vw causes scrollbar gap */
  z-index: 0;
  pointer-events: none;
}

.m3-layout-root {
  display: flex;
  min-height: 100vh;
  width: 100%;
  position: relative;
  z-index: 1;
}

.m3-main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  width: 100%;
  padding-bottom: 84px; /* Space for mobile bottom navigation bar (<600px) */
}

@media (max-width: 599px) {
  .m3-display-medium {
    font-size: 1.85rem !important;
    line-height: 1.22 !important;
  }
  .m3-headline-large {
    font-size: 1.45rem !important;
    line-height: 1.25 !important;
  }
}

@media (min-width: 600px) {
  .m3-main-content {
    padding-bottom: 0;
  }
}

/* Standard Content Container */
.m3-container {
  width: 100%;
  max-width: 1320px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 16px;
  padding-right: 16px;
}

@media (min-width: 600px) {
  .m3-container {
    padding-left: 24px;
    padding-right: 24px;
  }
}

@media (min-width: 840px) {
  .m3-container {
    padding-left: 32px;
    padding-right: 32px;
  }
}

@media (min-width: 1200px) {
  .m3-container {
    padding-left: 48px;
    padding-right: 48px;
  }
}

/* Section Spacing */
.m3-section {
  padding-top: 64px;
  padding-bottom: 64px;
  position: relative;
  scroll-margin-top: 72px;
}

@media (min-width: 840px) {
  .m3-section {
    padding-top: 96px;
    padding-bottom: 96px;
  }
}

/* --------------------------------------------------------------------------
   3. Adaptive Navigation System
   - Mobile (<600px): Bottom Navigation Bar
   - Tablet (600px - 840px): Navigation Rail
   - Desktop (>840px): Navigation Drawer / Top App Bar
   -------------------------------------------------------------------------- */

/* --- A. TOP APP BAR (Desktop / Standard) --- */
.m3-top-app-bar {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px; /* explicit gap so flex children don't touch on narrow screens */
  padding: 0 16px;
  background-color: var(--md-sys-color-surface);
  transition: background-color var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard),
              box-shadow var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
}

.m3-top-app-bar.scrolled {
  background-color: var(--md-sys-color-surface-container);
  box-shadow: var(--md-sys-elevation-level2);
}

.m3-top-app-bar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--md-sys-typescale-font-brand);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--md-sys-color-on-surface);
  white-space: nowrap;
  flex-shrink: 0;
}

.m3-top-app-bar-brand span {
  white-space: nowrap;
  display: inline-block;
}

.m3-top-app-bar-brand img,
.m3-top-app-bar-brand svg {
  width: 32px;
  height: 32px;
  border-radius: var(--md-sys-shape-corner-small);
  flex-shrink: 0;
}

.m3-top-app-bar-nav {
  display: none;
  align-items: center;
  gap: 8px;
}

@media (min-width: 840px) {
  .m3-top-app-bar-nav {
    display: flex;
  }
}

.m3-top-app-bar-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0; /* actions row must not collapse — but we reduce its contents at breakpoints */
}

/* ≤599px: hide button text labels, shrink padding */
@media (max-width: 599px) {
  .m3-top-app-bar {
    padding: 0 12px;
    gap: 6px;
  }
  .m3-top-app-bar-brand {
    gap: 8px;
    font-size: 1.1rem;
  }
  .m3-top-app-bar-actions {
    gap: 4px;
  }
  .m3-top-app-bar-actions .m3-btn span:not(.material-symbols-rounded) {
    display: none;
  }
  .m3-top-app-bar-actions .m3-btn {
    padding: 0 10px;
    min-width: 40px;
    height: 38px;
  }
}

/* ≤480px: also hide inactive theme-mode buttons to save space (keep only active + icon-only download) */
@media (max-width: 480px) {
  .m3-top-app-bar-actions .m3-btn {
    padding: 0 8px;
    min-width: 36px;
    height: 36px;
  }
  /* Compact theme switcher: reduce icon button size */
  .m3-top-app-bar-actions .m3-icon-btn,
  .m3-top-app-bar-actions .m3-icon-btn[data-theme-mode] {
    width: 30px;
    height: 30px;
  }
  /* Tighten segmented group padding */
  .m3-top-app-bar-actions .m3-theme-segmented-group {
    padding: 2px;
    gap: 1px;
  }
}

/* ≤360px: hide GitHub button, further compress */
@media (max-width: 360px) {
  .m3-top-app-bar {
    padding: 0 8px;
    gap: 4px;
  }
  .m3-top-app-bar-brand {
    gap: 6px;
    font-size: 1rem;
  }
  .m3-top-app-bar-actions a[aria-label="GitHub Repository"] {
    display: none !important;
  }
  .m3-top-app-bar-actions .m3-btn {
    padding: 0 6px;
    min-width: 32px;
  }
}

/* --- B. NAVIGATION BAR (Mobile & Tablet Bottom Nav - <840px) --- */
.m3-nav-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: calc(68px + env(safe-area-inset-bottom, 0px));
  z-index: 1050;
  background-color: var(--md-sys-color-surface-container);
  border-top: 1px solid var(--md-sys-color-outline-variant);
  display: flex;
  justify-content: space-around;
  align-items: center;
  padding: 0 8px env(safe-area-inset-bottom, 0px) 8px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  touch-action: manipulation;
}

@media (min-width: 840px) {
  .m3-nav-bar {
    display: none !important;
  }
}

.m3-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  text-decoration: none;
  color: var(--md-sys-color-on-surface-variant);
  padding: 6px 8px;
  min-width: 64px;
  cursor: pointer;
  user-select: none;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

@media (max-width: 360px) {
  .m3-nav-item {
    min-width: 0;
    flex: 1;
    padding: 4px 2px;
  }
  .m3-nav-pill {
    width: 48px !important;
  }
}

.m3-nav-pill {
  width: 64px;
  height: 32px;
  border-radius: var(--md-sys-shape-corner-full);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: background-color var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard),
              color var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
}

.m3-nav-item.active .m3-nav-pill {
  background-color: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
}

.m3-nav-item.active .m3-nav-pill .material-symbols-rounded {
  font-variation-settings: 'FILL' 1, 'wght' 400, 'GRAD' 0, 'opsz' 24;
}

.m3-nav-label {
  font-family: var(--md-sys-typescale-label-small-font);
  font-size: var(--md-sys-typescale-label-small-size);
  font-weight: var(--md-sys-typescale-label-small-weight);
  letter-spacing: var(--md-sys-typescale-label-small-tracking);
  color: var(--md-sys-color-on-surface-variant);
  transition: color var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard),
              font-weight var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
}

.m3-nav-item.active .m3-nav-label {
  font-weight: 700;
  color: var(--md-sys-color-on-surface);
}

/* --- C. NAVIGATION RAIL (Tablet 600px - 840px) --- */
.m3-nav-rail {
  display: none;
  width: 80px;
  height: 100vh;
  position: sticky;
  top: 0;
  background-color: var(--md-sys-color-surface);
  border-right: 1px solid var(--md-sys-color-outline-variant);
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0 16px;
  z-index: 95;
}

@media (min-width: 600px) and (max-width: 839px) {
  .m3-nav-rail {
    display: flex;
  }
}

.m3-nav-rail-top {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  width: 100%;
}

.m3-nav-rail-destinations {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: 100%;
}

.m3-nav-rail-bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

/* --- D. NAVIGATION DRAWER (Desktop >840px / Extended Flyout) --- */
.m3-nav-drawer {
  display: none;
  width: 280px;
  height: 100vh;
  position: sticky;
  top: 0;
  background-color: var(--md-sys-color-surface-container-low);
  border-right: 1px solid var(--md-sys-color-outline-variant);
  flex-direction: column;
  padding: 16px 12px;
  overflow-y: auto;
  z-index: 95;
}

.m3-nav-drawer-header {
  padding: 16px 16px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--md-sys-typescale-font-brand);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--md-sys-color-on-surface);
}

.m3-nav-drawer-section-title {
  padding: 16px 16px 8px;
  font-family: var(--md-sys-typescale-title-small-font);
  font-size: var(--md-sys-typescale-title-small-size);
  font-weight: 700;
  color: var(--md-sys-color-on-surface-variant);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.m3-drawer-item {
  display: flex;
  align-items: center;
  gap: 16px;
  height: 56px;
  padding: 0 16px;
  border-radius: var(--md-sys-shape-corner-full);
  color: var(--md-sys-color-on-surface-variant);
  font-family: var(--md-sys-typescale-label-large-font);
  font-size: var(--md-sys-typescale-label-large-size);
  font-weight: var(--md-sys-typescale-label-large-weight);
  text-decoration: none;
  transition: background-color var(--md-sys-motion-duration-short2) var(--md-sys-motion-easing-standard),
              color var(--md-sys-motion-duration-short2) var(--md-sys-motion-easing-standard);
  position: relative;
  overflow: hidden;
}

.m3-drawer-item.active {
  background-color: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
}

.m3-drawer-item.active .material-symbols-rounded {
  font-variation-settings: 'FILL' 1, 'wght' 400, 'GRAD' 0, 'opsz' 24;
}

/* --------------------------------------------------------------------------
   4. Bento-Grid Layout System
   Optimized for hardware benchmarks, feature showcases, and interactive modules
   -------------------------------------------------------------------------- */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 16px;
  width: 100%;
}

@media (min-width: 840px) {
  .bento-grid {
    gap: 24px;
  }
}

/* Column Span Utilities */
.bento-col-12 { grid-column: span 12; }
.bento-col-8  { grid-column: span 12; }
.bento-col-7  { grid-column: span 12; }
.bento-col-6  { grid-column: span 12; }
.bento-col-5  { grid-column: span 12; }
.bento-col-4  { grid-column: span 12; }
.bento-col-3  { grid-column: span 12; }

@media (min-width: 600px) and (max-width: 839px) {
  .bento-col-4 { grid-column: span 6; }
  .bento-col-3 { grid-column: span 6; }
  .bento-col-6 { grid-column: span 6; }
  .bento-col-md-6 { grid-column: span 6; }
  .bento-col-md-12 { grid-column: span 12; }
}

@media (min-width: 840px) {
  .bento-col-8 { grid-column: span 8; }
  .bento-col-7 { grid-column: span 7; }
  .bento-col-6 { grid-column: span 6; }
  .bento-col-5 { grid-column: span 5; }
  .bento-col-4 { grid-column: span 4; }
  .bento-col-3 { grid-column: span 3; }
}

/* Bento Card Base Container */
.bento-card {
  background-color: var(--md-sys-color-surface-container-low);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-extra-large);
  padding: 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  transition: transform var(--md-sys-motion-duration-medium1) var(--md-sys-motion-easing-emphasized),
              box-shadow var(--md-sys-motion-duration-medium1) var(--md-sys-motion-easing-emphasized),
              border-color var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard),
              background-color var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
}

@media (min-width: 840px) {
  .bento-card {
    padding: 32px;
  }
}

.bento-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--md-sys-elevation-level3);
  border-color: var(--md-sys-color-primary);
  background-color: var(--md-sys-color-surface-container);
}

.bento-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 16px;
}

.bento-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--md-sys-shape-corner-medium);
  background-color: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  display: flex;
  align-items: center;
  justify-content: center;
}

.bento-card-title {
  font-family: var(--md-sys-typescale-title-large-font);
  font-size: var(--md-sys-typescale-title-large-size);
  font-weight: 700;
  color: var(--md-sys-color-on-surface);
  margin-bottom: 8px;
}

.bento-card-description {
  font-family: var(--md-sys-typescale-body-medium-font);
  font-size: var(--md-sys-typescale-body-medium-size);
  color: var(--md-sys-color-on-surface-variant);
  line-height: 1.5;
  margin-bottom: 20px;
}

.bento-card-content {
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* --------------------------------------------------------------------------
   5. Flex & Grid Helper Utilities
   -------------------------------------------------------------------------- */
.m3-flex-row {
  display: flex;
  flex-direction: row;
  align-items: center;
}

.m3-flex-col {
  display: flex;
  flex-direction: column;
}

.m3-gap-xs { gap: 4px; }
.m3-gap-sm { gap: 8px; }
.m3-gap-md { gap: 16px; }
.m3-gap-lg { gap: 24px; }
.m3-gap-xl { gap: 32px; }

.m3-align-center { align-items: center; }
.m3-justify-between { justify-content: space-between; }
.m3-justify-center { justify-content: center; }