/*
 * app.css — komponen & layout situs, Material Design 3 (M3 Expressive).
 *
 * Sumber spec yang dipakai (diverifikasi lewat skill material-design-3, 9 Sep 2026):
 *   App bars      https://m3.material.io/components/app-bars/specs            (small: 64 dp, on-scroll surface-container + level2)
 *   Nav bar       https://m3.material.io/components/navigation-bar/specs      (flexible 64 dp, indikator 56×32 full, label-medium)
 *   Nav rail      https://m3.material.io/components/navigation-rail/specs     (collapsed 96 dp / expanded 220–360 dp, top space 44)
 *   Buttons       https://m3.material.io/components/buttons/specs             (S 40 dp pad 16 · M 56 dp pad 24; pressed shape morph)
 *   Icon buttons  https://m3.material.io/components/icon-buttons/specs        (standard S 40 dp, ikon 24, target 48)
 *   FAB           https://m3.material.io/components/floating-action-button/specs (baseline 56 dp, corner large, level3 → level4)
 *   Cards         https://m3.material.io/components/cards/specs               (corner medium; elevated/filled/outlined)
 *   Chips         https://m3.material.io/components/chips/specs               (32 dp, corner small, outline-variant, ikon 18)
 *   Lists         https://m3.material.io/components/lists/specs               (56/72/88 dp, padding 16, avatar 40)
 *   Menus         https://m3.material.io/components/menus/specs               (112–280 dp, item 48, corner extra-small, level2)
 *   Divider       https://m3.material.io/components/divider/specs             (outline-variant 1 dp)
 *   States        https://m3.material.io/foundations/interaction/states/state-layers
 *   Layout        https://m3.material.io/foundations/layout/applying-layout/window-size-classes
 * Token: css/tokens/*.css (color dari seed #0071E3, tonal-spot, spec 2025).
 * Variabel situs memakai prefix --app-*; variabel privat komponen --_*.
 */
@layer tokens, base, components, utilities;

/* ---------------------------------------------------------------- base */
@layer base {
  :root {
    --md-ref-typeface-plain: "Roboto Flex", Roboto, system-ui, -apple-system, "Segoe UI", sans-serif;
    --md-ref-typeface-brand: var(--md-ref-typeface-plain);

    /* Layout M3: compact <600 (margin 16, navigation bar), medium/expanded 600–1199 (margin 24, rail 96),
       large ≥1200 (expanded rail 280 — dalam rentang 220–360). */
    --app-layout-margin: 16px;
    --app-layout-nav-inline: 0px;
    --app-layout-nav-bottom: 64px;
    --app-top-app-bar-height: 64px;
    --app-content-max: 1040px;
    --app-section-gap: 56px;
  }
  @media (width >= 600px) {
    :root {
      --app-layout-margin: 24px;
      --app-layout-nav-inline: 96px;
      --app-layout-nav-bottom: 0px;
      --app-section-gap: 72px;
    }
  }
  @media (width >= 1200px) {
    :root {
      --app-layout-nav-inline: 280px;
      --app-section-gap: 88px;
    }
  }

  *,
  *::before,
  *::after {
    box-sizing: border-box;
  }
  html {
    scroll-behavior: smooth;
    scroll-padding-block-start: calc(var(--app-top-app-bar-height) + 16px);
    -webkit-text-size-adjust: 100%;
  }
  @media (prefers-reduced-motion: reduce) {
    html {
      scroll-behavior: auto;
    }
  }
  body {
    margin: 0;
    min-height: 100dvh;
    background: var(--md-sys-color-surface);
    color: var(--md-sys-color-on-surface);
    font-family: var(--md-sys-typescale-body-large-font);
    font-size: var(--md-sys-typescale-body-large-size);
    line-height: var(--md-sys-typescale-body-large-line-height);
    font-weight: var(--md-sys-typescale-body-large-weight);
    letter-spacing: var(--md-sys-typescale-body-large-tracking);
    -webkit-font-smoothing: antialiased;
  }
  h1,
  h2,
  h3,
  h4,
  p,
  ul,
  ol,
  figure {
    margin: 0;
  }
  ul,
  ol {
    padding: 0;
    list-style: none;
  }
  a {
    color: var(--md-sys-color-primary);
    text-decoration-thickness: 1px;
    text-underline-offset: 0.15em;
  }
  button {
    font: inherit;
    color: inherit;
    background: none;
    border: 0;
    padding: 0;
    cursor: pointer;
  }
  img,
  svg {
    display: block;
    max-width: 100%;
  }
  /* Focus indicator M3: 3 dp secondary, offset 2 dp — mengikuti bentuk komponen. */
  :focus-visible {
    outline: 3px solid var(--md-sys-color-secondary);
    outline-offset: 2px;
  }
  /* Material Symbols Rounded (variable: FILL, wght, GRAD, opsz) — subset lewat parameter icon_names di Google Fonts. */
  .md-icon {
    font-family: "Material Symbols Rounded";
    font-weight: normal;
    font-style: normal;
    font-size: 24px;
    line-height: 1;
    inline-size: 1em;
    block-size: 1em;
    display: inline-block;
    letter-spacing: normal;
    text-transform: none;
    white-space: nowrap;
    word-wrap: normal;
    direction: ltr;
    overflow: hidden;
    flex-shrink: 0;
    -webkit-font-feature-settings: "liga";
    font-feature-settings: "liga";
    font-variation-settings: "FILL" 0, "wght" 400, "GRAD" 0, "opsz" 24;
    transition: font-variation-settings var(--md-sys-motion-spring-standard-fast-effects-duration)
      var(--md-sys-motion-spring-standard-fast-effects);
  }
  .md-icon[data-fill="1"],
  [aria-current="page"] > .md-icon,
  [aria-checked="true"] > .md-icon {
    font-variation-settings: "FILL" 1, "wght" 400, "GRAD" 0, "opsz" 24;
  }
  .md-icon[data-size="20"] {
    font-size: 20px;
    font-variation-settings: "FILL" 0, "wght" 400, "GRAD" 0, "opsz" 20;
  }
  .md-icon[data-size="18"] {
    font-size: 18px;
    font-variation-settings: "FILL" 0, "wght" 400, "GRAD" 0, "opsz" 20;
  }
  .md-icon[data-size="40"] {
    font-size: 40px;
    font-variation-settings: "FILL" 0, "wght" 400, "GRAD" 0, "opsz" 40;
  }
  .app-visually-hidden {
    position: absolute;
    inline-size: 1px;
    block-size: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
  }
}

/* ---------------------------------------------------------- components */
@layer components {
  /* ---------- Skip link (text button yang muncul saat fokus) ---------- */
  .app-skip {
    position: fixed;
    inset-block-start: 8px;
    inset-inline-start: 8px;
    z-index: 100;
    translate: 0 -200%;
    background: var(--md-sys-color-inverse-surface);
    color: var(--md-sys-color-inverse-on-surface);
    padding: 10px 16px;
    border-radius: var(--md-sys-shape-corner-full);
    text-decoration: none;
  }
  .app-skip:focus-visible {
    translate: 0 0;
  }

  /* ---------- Top app bar (small) ---------- */
  .md-top-app-bar {
    position: sticky;
    inset-block-start: 0;
    z-index: 40;
    block-size: var(--app-top-app-bar-height);
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 4px;
    padding-inline: 4px; /* LeadingSpace/TrailingSpace 4 dp */
    background: var(--md-sys-color-surface);
    color: var(--md-sys-color-on-surface);
    transition: background-color var(--md-sys-motion-spring-standard-default-effects-duration)
        var(--md-sys-motion-spring-standard-default-effects),
      box-shadow var(--md-sys-motion-spring-standard-default-effects-duration)
        var(--md-sys-motion-spring-standard-default-effects);
  }
  .md-top-app-bar[data-scrolled="true"] {
    background: var(--md-sys-color-surface-container);
    box-shadow: var(--md-sys-elevation-shadow-level2);
  }
  .md-top-app-bar__brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 4px 12px 4px 8px;
    border-radius: var(--md-sys-shape-corner-full);
    color: var(--md-sys-color-on-surface);
    text-decoration: none;
    min-block-size: 48px;
  }
  .md-top-app-bar__avatar {
    inline-size: 32px; /* AvatarSize 32 dp */
    block-size: 32px;
    border-radius: var(--md-sys-shape-corner-full);
    background: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    display: grid;
    place-items: center;
  }
  .md-top-app-bar__title {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .md-top-app-bar__actions {
    display: inline-flex;
    align-items: center;
    gap: 0; /* IconButtonSpace 0 dp */
  }

  /* ---------- Icon button (standard, S: 40 dp, target 48) ---------- */
  .md-icon-button {
    position: relative;
    isolation: isolate;
    inline-size: 40px;
    block-size: 40px;
    margin: 4px;
    border-radius: var(--md-sys-shape-corner-full);
    color: var(--md-sys-color-on-surface-variant);
    display: inline-grid;
    place-items: center;
    transition: border-radius var(--md-sys-motion-spring-standard-fast-spatial-duration)
      var(--md-sys-motion-spring-standard-fast-spatial);
  }
  .md-icon-button:active {
    border-radius: var(--md-sys-shape-corner-small); /* PressedContainerShape */
  }
  .md-icon-button[aria-expanded="true"] {
    color: var(--md-sys-color-primary);
  }

  /* ---------- Common buttons (S 40 dp default, M 56 dp) ---------- */
  .md-button {
    --_height: 40px;
    --_pad: 16px;
    --_radius: var(--md-sys-shape-corner-full);
    position: relative;
    isolation: isolate;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px; /* IconLabelSpace */
    min-block-size: var(--_height);
    padding-inline: var(--_pad);
    border-radius: var(--_radius);
    font-family: var(--md-sys-typescale-label-large-font);
    font-size: var(--md-sys-typescale-label-large-size);
    line-height: var(--md-sys-typescale-label-large-line-height);
    font-weight: var(--md-sys-typescale-label-large-weight);
    letter-spacing: var(--md-sys-typescale-label-large-tracking);
    text-decoration: none;
    white-space: nowrap;
    transition: border-radius var(--md-sys-motion-spring-standard-fast-spatial-duration)
        var(--md-sys-motion-spring-standard-fast-spatial),
      box-shadow var(--md-sys-motion-spring-standard-fast-effects-duration)
        var(--md-sys-motion-spring-standard-fast-effects);
  }
  .md-button .md-icon {
    font-size: 20px;
    font-variation-settings: "FILL" 0, "wght" 400, "GRAD" 0, "opsz" 20;
  }
  .md-button:active {
    border-radius: var(--md-sys-shape-corner-small); /* PressedContainerShape (XS/S) */
  }
  .md-button--m {
    --_height: 56px;
    --_pad: 24px;
    font-family: var(--md-sys-typescale-title-medium-font);
    font-size: var(--md-sys-typescale-title-medium-size);
    line-height: var(--md-sys-typescale-title-medium-line-height);
    font-weight: var(--md-sys-typescale-title-medium-weight);
    letter-spacing: var(--md-sys-typescale-title-medium-tracking);
  }
  .md-button--m .md-icon {
    font-size: 24px;
    font-variation-settings: "FILL" 0, "wght" 400, "GRAD" 0, "opsz" 24;
  }
  .md-button--m:active {
    border-radius: var(--md-sys-shape-corner-medium); /* PressedContainerShape (M) */
  }
  .md-button--filled {
    background: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
  }
  @media (hover: hover) {
    .md-button--filled:hover {
      box-shadow: var(--md-sys-elevation-shadow-level1); /* HoveredContainerElevation */
    }
    .md-button--tonal:hover {
      box-shadow: var(--md-sys-elevation-shadow-level1);
    }
  }
  .md-button--tonal {
    background: var(--md-sys-color-secondary-container);
    color: var(--md-sys-color-on-secondary-container);
  }
  .md-button--outlined {
    background: transparent;
    color: var(--md-sys-color-on-surface-variant);
    box-shadow: inset 0 0 0 1px var(--md-sys-color-outline-variant);
  }
  .md-button--text {
    --_pad: 12px;
    background: transparent;
    color: var(--md-sys-color-on-surface-variant);
  }

  /* ---------- FAB (baseline 56 dp, primary-container, level3) ---------- */
  .md-fab {
    position: fixed;
    z-index: 30;
    inset-inline-end: 16px;
    inset-block-end: calc(var(--app-layout-nav-bottom) + 16px);
    inline-size: 56px;
    block-size: 56px;
    border-radius: var(--md-sys-shape-corner-large);
    background: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    box-shadow: var(--md-sys-elevation-shadow-level3);
    display: grid;
    place-items: center;
    isolation: isolate;
    opacity: 0;
    visibility: hidden;
    translate: 0 8px;
    transition: opacity var(--md-sys-motion-spring-standard-default-effects-duration)
        var(--md-sys-motion-spring-standard-default-effects),
      translate var(--md-sys-motion-spring-standard-fast-spatial-duration)
        var(--md-sys-motion-spring-standard-fast-spatial),
      visibility 0s linear var(--md-sys-motion-spring-standard-default-effects-duration),
      box-shadow var(--md-sys-motion-spring-standard-fast-effects-duration)
        var(--md-sys-motion-spring-standard-fast-effects);
  }
  .md-fab[data-visible="true"] {
    opacity: 1;
    visibility: visible;
    translate: 0 0;
    transition-delay: 0s;
  }
  @media (hover: hover) {
    .md-fab:hover {
      box-shadow: var(--md-sys-elevation-shadow-level4);
    }
  }
  @media (width >= 600px) {
    .md-fab {
      inset-inline-end: 24px;
      inset-block-end: 24px;
    }
  }

  /* ---------- Navigation bar (compact only) ---------- */
  .md-navigation-bar {
    position: fixed;
    inset-inline: 0;
    inset-block-end: 0;
    z-index: 40;
    block-size: var(--app-layout-nav-bottom);
    background: var(--md-sys-color-surface-container);
    box-shadow: var(--md-sys-elevation-shadow-level2);
    padding-block-end: env(safe-area-inset-bottom);
  }
  .md-navigation-bar__list {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: 1fr;
    block-size: 64px;
  }
  .md-navigation-bar__item .md-nav-label {
    white-space: nowrap;
    text-align: center;
  }
  .md-navigation-bar__item,
  .md-navigation-rail__item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px; /* ActiveIndicatorIconLabelSpace */
    padding-block: 6px; /* ContainerBetweenSpace */
    color: var(--md-sys-color-on-surface-variant);
    text-decoration: none;
    font-family: var(--md-sys-typescale-label-medium-font);
    font-size: var(--md-sys-typescale-label-medium-size);
    line-height: var(--md-sys-typescale-label-medium-line-height);
    font-weight: var(--md-sys-typescale-label-medium-weight);
    letter-spacing: var(--md-sys-typescale-label-medium-tracking);
  }
  .md-nav-indicator {
    position: relative;
    isolation: isolate;
    inline-size: 56px; /* ActiveIndicatorWidth */
    block-size: 32px; /* ActiveIndicatorHeight */
    border-radius: var(--md-sys-shape-corner-full);
    display: grid;
    place-items: center;
    color: var(--md-sys-color-on-surface-variant);
    transition: background-color var(--md-sys-motion-spring-standard-fast-effects-duration)
      var(--md-sys-motion-spring-standard-fast-effects);
  }
  /* State layer nav item hidup di indikator (warna konten aktif = on-secondary-container). */
  .md-nav-indicator::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: var(--md-sys-color-on-secondary-container);
    opacity: 0;
    transition: opacity var(--md-sys-motion-spring-standard-fast-effects-duration)
      var(--md-sys-motion-spring-standard-fast-effects);
  }
  @media (hover: hover) {
    .md-navigation-bar__item:hover .md-nav-indicator::before,
    .md-navigation-rail__item:hover .md-nav-indicator::before {
      opacity: var(--md-sys-state-hover-state-layer-opacity);
    }
  }
  .md-navigation-bar__item:focus-visible .md-nav-indicator::before,
  .md-navigation-rail__item:focus-visible .md-nav-indicator::before {
    opacity: var(--md-sys-state-focus-state-layer-opacity);
  }
  .md-navigation-bar__item:active .md-nav-indicator::before,
  .md-navigation-rail__item:active .md-nav-indicator::before {
    opacity: var(--md-sys-state-pressed-state-layer-opacity);
  }
  .md-navigation-bar__item[aria-current="page"],
  .md-navigation-rail__item[aria-current="page"] {
    color: var(--md-sys-color-secondary); /* ItemActiveLabelTextColor */
    font-weight: var(--md-sys-typescale-emphasized-label-medium-weight);
  }
  .md-navigation-bar__item[aria-current="page"] .md-nav-indicator,
  .md-navigation-rail__item[aria-current="page"] .md-nav-indicator {
    background: var(--md-sys-color-secondary-container);
    color: var(--md-sys-color-on-secondary-container);
  }
  [aria-current="page"] .md-nav-indicator > .md-icon {
    font-variation-settings: "FILL" 1, "wght" 400, "GRAD" 0, "opsz" 24;
  }

  /* ---------- Navigation rail (collapsed ≥600, expanded ≥1200) ---------- */
  .md-navigation-rail {
    display: none;
    position: fixed;
    inset-block: var(--app-top-app-bar-height) 0;
    inset-inline-start: 0;
    z-index: 30;
    inline-size: var(--app-layout-nav-inline);
    background: var(--md-sys-color-surface);
    padding-block-start: 44px; /* TopSpace */
    overflow-y: auto;
  }
  .md-navigation-rail__list {
    display: flex;
    flex-direction: column;
    gap: 4px; /* ItemVerticalSpace */
  }
  .md-navigation-rail__item {
    padding-inline: 16px; /* LeadingSpace/TrailingSpace */
    text-align: center;
    text-wrap: balance;
  }
  @media (width >= 600px) {
    .md-navigation-bar {
      display: none;
    }
    .md-navigation-rail {
      display: block;
    }
  }
  /* Expanded rail: item horizontal 56 dp, indikator selebar item, label-large. */
  @media (width >= 1200px) {
    .md-navigation-rail {
      padding-inline: 20px;
    }
    .md-navigation-rail__item {
      flex-direction: row;
      justify-content: flex-start;
      padding: 0;
      font-family: var(--md-sys-typescale-label-large-font);
      font-size: var(--md-sys-typescale-label-large-size);
      line-height: var(--md-sys-typescale-label-large-line-height);
      font-weight: var(--md-sys-typescale-label-large-weight);
      letter-spacing: var(--md-sys-typescale-label-large-tracking);
    }
    .md-navigation-rail__item[aria-current="page"] {
      font-weight: var(--md-sys-typescale-emphasized-label-large-weight);
      color: var(--md-sys-color-on-secondary-container);
    }
    .md-navigation-rail__item .md-nav-indicator {
      inline-size: 100%;
      block-size: 56px; /* ActiveIndicatorHeight (horizontal) */
      grid-template-columns: auto 1fr;
      justify-items: start;
      gap: 8px; /* IconLabelSpace */
      padding-inline: 16px;
    }
    .md-navigation-rail__item .md-nav-label {
      display: none; /* label pindah ke dalam indikator */
    }
    .md-navigation-rail__item .md-nav-indicator > .md-nav-label--inline {
      display: inline;
    }
  }
  .md-nav-label--inline {
    display: none;
  }

  /* ---------- Menu (Popover API) ---------- */
  .md-menu {
    position: fixed;
    inset: auto;
    margin: 0;
    min-inline-size: 112px;
    max-inline-size: 280px;
    inline-size: 200px;
    padding: 8px 0;
    border: 0;
    border-radius: var(--md-sys-shape-corner-extra-small);
    background: var(--md-sys-color-surface-container);
    color: var(--md-sys-color-on-surface);
    box-shadow: var(--md-sys-elevation-shadow-level2);
    opacity: 0;
    translate: 0 -4px;
    transition: opacity var(--md-sys-motion-spring-standard-fast-effects-duration)
        var(--md-sys-motion-spring-standard-fast-effects),
      translate var(--md-sys-motion-spring-standard-fast-spatial-duration)
        var(--md-sys-motion-spring-standard-fast-spatial),
      display var(--md-sys-motion-spring-standard-fast-effects-duration) allow-discrete,
      overlay var(--md-sys-motion-spring-standard-fast-effects-duration) allow-discrete;
  }
  .md-menu:popover-open {
    opacity: 1;
    translate: 0 0;
  }
  @starting-style {
    .md-menu:popover-open {
      opacity: 0;
      translate: 0 -4px;
    }
  }
  .md-menu__item {
    position: relative;
    isolation: isolate;
    display: flex;
    align-items: center;
    gap: 12px;
    inline-size: 100%;
    block-size: 48px;
    padding-inline: 12px;
    color: var(--md-sys-color-on-surface);
    text-align: start;
    font-family: var(--md-sys-typescale-body-large-font);
    font-size: var(--md-sys-typescale-body-large-size);
    line-height: var(--md-sys-typescale-body-large-line-height);
    letter-spacing: var(--md-sys-typescale-body-large-tracking);
  }
  .md-menu__item > .md-icon {
    color: var(--md-sys-color-on-surface-variant);
  }
  /* Ikon check hanya untuk item terpilih (menuitemradio). */
  .md-menu__item[aria-checked="false"] > .md-icon {
    visibility: hidden;
  }
  .md-menu__item[aria-checked="true"] {
    background: var(--md-sys-color-secondary-container);
    color: var(--md-sys-color-on-secondary-container);
  }
  .md-menu__item[aria-checked="true"] > .md-icon {
    color: var(--md-sys-color-on-secondary-container);
  }
  .md-menu__item:focus-visible {
    outline-offset: -3px;
  }

  /* ---------- Cards ---------- */
  .md-card {
    border-radius: var(--md-sys-shape-corner-medium);
    padding: 16px;
    color: var(--md-sys-color-on-surface);
    transition: box-shadow var(--md-sys-motion-spring-standard-fast-effects-duration)
      var(--md-sys-motion-spring-standard-fast-effects);
  }
  .md-card--elevated {
    background: var(--md-sys-color-surface-container-low);
    box-shadow: var(--md-sys-elevation-shadow-level1);
  }
  .md-card--filled {
    background: var(--md-sys-color-surface-container-highest);
  }
  .md-card--outlined {
    background: var(--md-sys-color-surface);
    box-shadow: inset 0 0 0 1px var(--md-sys-color-outline-variant);
  }
  .md-card__icon {
    color: var(--md-sys-color-primary); /* IconColor */
  }
  .app-card--list {
    padding: 8px 0;
  }
  .app-card--flush {
    padding: 0;
  }
  .app-step {
    min-block-size: auto;
  }

  /* ---------- Chips (assist, statis) ---------- */
  .md-chip-set {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }
  .md-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    block-size: 32px;
    padding-inline: 16px;
    border-radius: var(--md-sys-shape-corner-small);
    box-shadow: inset 0 0 0 1px var(--md-sys-color-outline-variant);
    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);
    line-height: var(--md-sys-typescale-label-large-line-height);
    font-weight: var(--md-sys-typescale-label-large-weight);
    letter-spacing: var(--md-sys-typescale-label-large-tracking);
    white-space: nowrap;
  }
  .md-chip > .md-icon {
    font-size: 18px;
    font-variation-settings: "FILL" 0, "wght" 400, "GRAD" 0, "opsz" 20;
    color: var(--md-sys-color-primary);
    margin-inline-start: -8px; /* padding 8 dp di sisi ikon */
  }
  .md-chip--selected {
    box-shadow: none;
    background: var(--md-sys-color-secondary-container);
    color: var(--md-sys-color-on-secondary-container);
  }
  .md-chip--selected > .md-icon {
    color: var(--md-sys-color-on-secondary-container);
  }
  .md-chip--elevated {
    box-shadow: var(--md-sys-elevation-shadow-level1);
    background: var(--md-sys-color-surface-container-low);
  }

  /* ---------- Lists ---------- */
  .md-list {
    display: flex;
    flex-direction: column;
  }
  .md-list-item {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: start;
    column-gap: 16px;
    min-block-size: 56px;
    padding: 12px 16px; /* ItemTopSpace/BottomSpace ≈ 10–12 */
    color: var(--md-sys-color-on-surface);
  }
  .md-list-item--two-line {
    min-block-size: 72px;
  }
  .md-list-item--three-line {
    min-block-size: 88px;
  }
  .md-list-item__leading {
    color: var(--md-sys-color-on-surface-variant);
    padding-block-start: 2px;
  }
  .md-list-item__avatar {
    inline-size: 40px;
    block-size: 40px;
    border-radius: var(--md-sys-shape-corner-full);
    background: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    display: grid;
    place-items: center;
  }
  .md-list-item__overline {
    color: var(--md-sys-color-on-surface-variant);
  }
  .md-list-item__supporting {
    color: var(--md-sys-color-on-surface-variant);
  }
  .md-list-item__trailing {
    color: var(--md-sys-color-on-surface-variant);
    padding-block-start: 2px;
    text-align: end;
  }
  .md-list-item--interactive {
    position: relative;
    isolation: isolate;
    text-decoration: none;
    border-radius: var(--md-sys-shape-corner-extra-small);
    transition: border-radius var(--md-sys-motion-spring-standard-fast-spatial-duration)
      var(--md-sys-motion-spring-standard-fast-spatial);
  }
  @media (hover: hover) {
    .md-list-item--interactive:hover {
      border-radius: var(--md-sys-shape-corner-medium); /* ItemHoveredContainerExpressiveShape */
    }
  }
  .md-list-item--interactive:active {
    border-radius: var(--md-sys-shape-corner-large); /* ItemPressedContainerExpressiveShape */
  }
  .md-divider {
    border: 0;
    border-block-start: 1px solid var(--md-sys-color-outline-variant);
    margin: 0 16px; /* inset divider */
  }
  /* Divider inset di antara item list — digambar sebagai pseudo-element agar role="list"
     hanya berisi listitem (axe: aria-required-children). */
  .md-list--divided > li {
    position: relative;
  }
  .md-list--divided > li + li::before {
    content: "";
    position: absolute;
    inset-block-start: 0;
    inset-inline: 16px;
    border-block-start: 1px solid var(--md-sys-color-outline-variant);
  }

  /* ---------- Layout halaman ---------- */
  .app-main {
    padding-inline-start: var(--app-layout-nav-inline);
    padding-block-end: calc(var(--app-layout-nav-bottom) + 24px);
  }
  .app-container {
    max-inline-size: var(--app-content-max);
    margin-inline: auto;
    padding-inline: var(--app-layout-margin);
  }
  .app-section {
    padding-block: var(--app-section-gap) 0;
    scroll-margin-block-start: calc(var(--app-top-app-bar-height) + 8px);
  }
  .app-section__header {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-block-end: 24px;
    max-inline-size: 64ch;
  }
  .app-section__tag {
    color: var(--md-sys-color-primary);
  }
  .app-section__subtitle {
    color: var(--md-sys-color-on-surface-variant);
  }
  .app-grid {
    display: grid;
    gap: 16px;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr));
  }
  .app-grid--2 {
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr));
  }
  .app-grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
  @media (width >= 840px) {
    .app-grid--4 {
      grid-template-columns: repeat(4, 1fr);
    }
  }
  .app-stack {
    display: flex;
    flex-direction: column;
    gap: 16px;
  }

  /* ---------- Hero (komposisi type scale + buttons + chips + filled cards) ---------- */
  .app-hero {
    padding-block: 32px 0;
    display: flex;
    flex-direction: column;
    gap: 24px;
    align-items: flex-start;
  }
  @media (width >= 840px) {
    .app-hero {
      padding-block-start: 56px;
    }
  }
  .app-hero__title {
    max-inline-size: 18ch;
    text-wrap: balance;
  }
  .app-hero__title em {
    font-style: normal;
    color: var(--md-sys-color-primary);
  }
  @media (width < 840px) {
    .app-hero__title {
      --_size: var(--md-sys-typescale-display-medium-size);
      --_line-height: var(--md-sys-typescale-display-medium-line-height);
    }
  }
  @media (width < 600px) {
    .app-hero__title {
      --_size: var(--md-sys-typescale-display-small-size);
      --_line-height: var(--md-sys-typescale-display-small-line-height);
    }
  }
  .app-hero__subtitle {
    color: var(--md-sys-color-on-surface-variant);
    max-inline-size: 62ch;
  }
  .app-hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
  }
  .app-stats {
    inline-size: 100%;
    margin-block-start: 16px;
  }
  .app-stat {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }
  .app-stat__value {
    color: var(--md-sys-color-primary);
  }
  .app-stat__label {
    color: var(--md-sys-color-on-surface-variant);
  }

  /* ---------- About ---------- */
  .app-about {
    display: grid;
    gap: 16px;
  }
  @media (width >= 840px) {
    .app-about {
      grid-template-columns: 1.6fr 1fr;
      align-items: start;
    }
  }
  .app-about__summary strong {
    font-weight: var(--md-sys-typescale-emphasized-body-large-weight);
    color: var(--md-sys-color-on-surface);
  }
  .app-about__summary {
    color: var(--md-sys-color-on-surface-variant);
  }

  /* ---------- Impact / process cards ---------- */
  .app-feature {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }
  .app-feature__desc {
    color: var(--md-sys-color-on-surface-variant);
  }

  /* ---------- Experience ---------- */
  .app-role {
    display: grid;
    gap: 12px;
    padding: 16px;
  }
  @media (width >= 840px) {
    .app-role {
      grid-template-columns: 200px 1fr;
      gap: 24px;
      padding: 24px 16px;
    }
  }
  .app-role__meta {
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: flex-start;
    color: var(--md-sys-color-on-surface-variant);
  }
  .app-role__body {
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  .app-role__org {
    color: var(--md-sys-color-on-surface-variant);
  }
  .app-role dl {
    margin: 0;
    display: grid;
    grid-template-columns: auto 1fr;
    column-gap: 12px;
    row-gap: 6px;
  }
  .app-role dt {
    color: var(--md-sys-color-primary);
  }
  .app-role dd {
    margin: 0;
    color: var(--md-sys-color-on-surface-variant);
  }
  .app-role__links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-block-start: 4px;
  }

  /* ---------- Case studies ---------- */
  .app-case {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 24px 16px;
  }
  @media (width >= 600px) {
    .app-case {
      padding: 24px;
    }
  }
  .app-case__role {
    color: var(--md-sys-color-on-surface-variant);
  }
  .app-case__grid {
    display: grid;
    gap: 16px;
  }
  @media (width >= 840px) {
    .app-case__grid {
      grid-template-columns: 1fr 1fr;
    }
  }
  .app-case__block {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }
  .app-case__block h4 {
    color: var(--md-sys-color-primary);
  }
  .app-case__block p {
    color: var(--md-sys-color-on-surface-variant);
  }
  .app-case__lessons {
    background: var(--md-sys-color-tertiary-container);
    color: var(--md-sys-color-on-tertiary-container);
    border-radius: var(--md-sys-shape-corner-medium);
    padding: 16px;
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 12px;
    align-items: start;
  }
  .app-case__lessons h4 {
    color: inherit;
  }
  .app-case__lessons p {
    color: inherit;
  }
  .app-result {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }
  .app-result__value {
    color: var(--md-sys-color-primary);
  }
  .app-result__label {
    color: var(--md-sys-color-on-surface-variant);
  }

  /* ---------- Projects ---------- */
  .app-project {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }
  .app-project__head {
    display: flex;
    align-items: center;
    gap: 12px;
  }
  .app-project__desc {
    color: var(--md-sys-color-on-surface-variant);
    flex: 1;
  }
  .app-project__foot {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
  }

  /* ---------- Tech stack ---------- */
  .app-stack-cat {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }
  .app-stack-cat__title {
    display: flex;
    align-items: center;
    gap: 12px;
  }
  .app-stack-sub {
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  .app-stack-sub__title {
    color: var(--md-sys-color-on-surface-variant);
  }

  /* ---------- Contact ---------- */
  .app-contact {
    display: grid;
    gap: 16px;
  }
  @media (width >= 840px) {
    .app-contact {
      grid-template-columns: 1fr 1fr;
      align-items: start;
    }
  }
  .app-contact__list .md-list-item__headline {
    color: var(--md-sys-color-on-surface);
  }
  .app-contact__header {
    margin: 0;
  }
  .app-contact__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-block-start: 8px;
  }

  /* ---------- Footer ---------- */
  .app-footer {
    margin-block-start: var(--app-section-gap);
    padding-block: 24px 88px; /* ruang untuk FAB */
    color: var(--md-sys-color-on-surface-variant);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 8px;
  }
}