/* =============================================== */
/* FONT IMPORTS & DEFINITIONS
/* =============================================== */

/* Material Symbols (Icons) */
@font-face {
  font-family: 'Material Symbols Outlined';
  font-style: normal;
  font-weight: 100 700;
  font-display: block;
  src: url('/fonts/material-symbols-outlined-v284-latin-regular.woff2') format('woff2');
}

/* Roboto (UI Text) */
@font-face {
  font-display: swap;
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 400;
  src: url('/fonts/roboto-v49-latin-regular.woff2') format('woff2');
}
@font-face {
  font-display: swap;
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 500;
  src: url('/fonts/roboto-v49-latin-500.woff2') format('woff2');
}
@font-face {
  font-display: swap;
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 700;
  src: url('/fonts/roboto-v49-latin-700.woff2') format('woff2');
}


/* =============================================== */
/* ROOT VARIABLES (THEME)
/* =============================================== */

:root {
  color-scheme: dark;

  /* Typeface */
  --md-ref-typeface-brand: 'Roboto', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', 'Apple Color Emoji', 'Segoe UI Emoji';
  --md-ref-typeface-plain: var(--md-ref-typeface-brand);

  /* Dark color scheme */
  --md-sys-color-primary: rgb(130 211 227);
  --md-sys-color-surface-tint: rgb(130 211 227);
  --md-sys-color-on-primary: rgb(0 54 62);
  --md-sys-color-primary-container: rgb(0 78 89);
  --md-sys-color-on-primary-container: rgb(160 239 255);
  --md-sys-color-secondary: rgb(177 203 209);
  --md-sys-color-on-secondary: rgb(28 52 57);
  --md-sys-color-secondary-container: rgb(51 75 79);
  --md-sys-color-on-secondary-container: rgb(205 231 237);
  --md-sys-color-tertiary: rgb(188 197 235);
  --md-sys-color-on-tertiary: rgb(38 47 77);
  --md-sys-color-tertiary-container: rgb(60 70 101);
  --md-sys-color-on-tertiary-container: rgb(219 225 255);
  --md-sys-color-error: rgb(255 180 171);
  --md-sys-color-on-error: rgb(105 0 5);
  --md-sys-color-error-container: rgb(147 0 10);
  --md-sys-color-on-error-container: rgb(255 218 214);
  --md-sys-color-background: rgb(14 20 22);
  --md-sys-color-on-background: rgb(222 227 229);
  --md-sys-color-surface: rgb(14 20 22);
  --md-sys-color-on-surface: rgb(222 227 229);
  --md-sys-color-surface-variant: rgb(63 72 74);
  --md-sys-color-on-surface-variant: rgb(191 200 202);
  --md-sys-color-outline: rgb(137 146 149);
  --md-sys-color-outline-variant: rgb(63 72 74);
  --md-sys-color-shadow: rgb(0 0 0);
  --md-sys-color-scrim: rgb(0 0 0);
  --md-sys-color-inverse-surface: rgb(222 227 229);
  --md-sys-color-inverse-on-surface: rgb(43 49 51);
  --md-sys-color-inverse-primary: rgb(0 104 118);
  --md-sys-color-primary-fixed: rgb(160 239 255);
  --md-sys-color-on-primary-fixed: rgb(0 31 37);
  --md-sys-color-primary-fixed-dim: rgb(130 211 227);
  --md-sys-color-on-primary-fixed-variant: rgb(0 78 89);
  --md-sys-color-secondary-fixed: rgb(205 231 237);
  --md-sys-color-on-secondary-fixed: rgb(5 31 35);
  --md-sys-color-secondary-fixed-dim: rgb(177 203 209);
  --md-sys-color-on-secondary-fixed-variant: rgb(51 75 79);
  --md-sys-color-tertiary-fixed: rgb(219 225 255);
  --md-sys-color-on-tertiary-fixed: rgb(16 26 55);
  --md-sys-color-tertiary-fixed-dim: rgb(188 197 235);
  --md-sys-color-on-tertiary-fixed-variant: rgb(60 70 101);
  --md-sys-color-surface-dim: rgb(14 20 22);
  --md-sys-color-surface-bright: rgb(52 58 60);
  --md-sys-color-surface-container-lowest: rgb(9 15 16);
  --md-sys-color-surface-container-low: rgb(23 29 30);
  --md-sys-color-surface-container: rgb(27 33 34);
  --md-sys-color-surface-container-high: rgb(37 43 44);
  --md-sys-color-surface-container-highest: rgb(48 54 55);

  /* MD3 Spacing Scale */
  --md-spacing-base: 4px;
  --space-1: calc(var(--md-spacing-base) * 1);  /* 4px */
  --space-2: calc(var(--md-spacing-base) * 2);  /* 8px */
  --space-3: calc(var(--md-spacing-base) * 3);  /* 12px */
  --space-4: calc(var(--md-spacing-base) * 4);  /* 16px */
  --space-5: calc(var(--md-spacing-base) * 5);  /* 20px */
  --space-6: calc(var(--md-spacing-base) * 6);  /* 24px */
  --space-7: calc(var(--md-spacing-base) * 7);  /* 28px */
  --space-8: calc(var(--md-spacing-base) * 8);  /* 32px */
  
  /* MD3 Border Radius */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-xxl: 28px;
  --radius-full: 1000px;

  /* MD3 Elevation (Dark Theme) */
  --md-elev-0: none;
  --md-elev-1: 0px 1px 2px 0px rgba(0, 0, 0, 0.30), 0px 1px 3px 1px rgba(0, 0, 0, 0.15);
  --md-elev-2: 0px 1px 2px 0px rgba(0, 0, 0, 0.30), 0px 2px 6px 2px rgba(0, 0, 0, 0.15);
  --md-elev-3: 0px 1px 3px 0px rgba(0, 0, 0, 0.30), 0px 4px 8px 3px rgba(0, 0, 0, 0.15);
  --md-elev-4: 0px 2px 3px 0px rgba(0, 0, 0, 0.30), 0px 6px 10px 4px rgba(0, 0, 0, 0.15);
  --md-elev-5: 0px 4px 4px 0px rgba(0, 0, 0, 0.30), 0px 8px 12px 6px rgba(0, 0, 0, 0.15);

  /* MD3 Motion */
  --md-motion-duration-short1: 50ms;
  --md-motion-duration-short2: 100ms;
  --md-motion-duration-short3: 150ms;
  --md-motion-duration-short4: 200ms;
  --md-motion-duration-medium1: 250ms;
  --md-motion-duration-medium2: 300ms;
  --md-motion-duration-medium3: 350ms;
  --md-motion-duration-medium4: 400ms;
  --md-motion-duration-long1: 450ms;
  --md-motion-duration-long2: 500ms;
  --md-motion-duration-long3: 550ms;
  --md-motion-duration-long4: 600ms;
  
  /* MD3 Easing Functions */
  --md-motion-easing-standard: cubic-bezier(0.2, 0, 0, 1);
  --md-motion-easing-standard-decelerate: cubic-bezier(0, 0, 0, 1);
  --md-motion-easing-standard-accelerate: cubic-bezier(0.3, 0, 1, 1);
  --md-motion-easing-emphasized: cubic-bezier(0.2, 0, 0, 1);
  --md-motion-easing-emphasized-decelerate: cubic-bezier(0.05, 0.7, 0.1, 1);
  --md-motion-easing-emphasized-accelerate: cubic-bezier(0.3, 0, 0.8, 0.15);
}

/* =============================================== */
/* MATERIAL DESIGN 3 TYPOGRAPHY SCALE
/* =============================================== */

.md-typescale-display-large {
  font-family: var(--md-ref-typeface-brand);
  font-size: clamp(3.5rem, 8vw, 4rem);
  font-weight: 400;
  line-height: 1.12;
  letter-spacing: -0.25px;
}

.md-typescale-display-medium {
  font-family: var(--md-ref-typeface-brand);
  font-size: clamp(2.5rem, 6vw, 3.5rem);
  font-weight: 400;
  line-height: 1.16;
  letter-spacing: 0;
}

.md-typescale-display-small {
  font-family: var(--md-ref-typeface-brand);
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 400;
  line-height: 1.22;
  letter-spacing: 0;
}

.md-typescale-headline-large {
  font-family: var(--md-ref-typeface-brand);
  font-size: clamp(1.75rem, 4vw, 2rem);
  font-weight: 400;
  line-height: 1.25;
  letter-spacing: 0;
}

.md-typescale-headline-medium {
  font-family: var(--md-ref-typeface-brand);
  font-size: clamp(1.5rem, 3.5vw, 1.75rem);
  font-weight: 400;
  line-height: 1.29;
  letter-spacing: 0;
}

.md-typescale-headline-small {
  font-family: var(--md-ref-typeface-brand);
  font-size: 1.5rem;
  font-weight: 400;
  line-height: 1.33;
  letter-spacing: 0;
}

.md-typescale-title-large {
  font-family: var(--md-ref-typeface-brand);
  font-size: 1.375rem;
  font-weight: 500;
  line-height: 1.27;
  letter-spacing: 0;
}

.md-typescale-title-medium {
  font-family: var(--md-ref-typeface-plain);
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0.15px;
}

.md-typescale-title-small {
  font-family: var(--md-ref-typeface-plain);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.43;
  letter-spacing: 0.1px;
}

.md-typescale-body-large {
  font-family: var(--md-ref-typeface-plain);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0.5px;
}

.md-typescale-body-medium {
  font-family: var(--md-ref-typeface-plain);
  font-size: 0.875rem;
  font-weight: 400;
  line-height: 1.43;
  letter-spacing: 0.25px;
}

.md-typescale-body-small {
  font-family: var(--md-ref-typeface-plain);
  font-size: 0.75rem;
  font-weight: 400;
  line-height: 1.33;
  letter-spacing: 0.4px;
}

.md-typescale-label-large {
  font-family: var(--md-ref-typeface-plain);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.43;
  letter-spacing: 0.1px;
}

.md-typescale-label-medium {
  font-family: var(--md-ref-typeface-plain);
  font-size: 0.75rem;
  font-weight: 500;
  line-height: 1.33;
  letter-spacing: 0.5px;
}

.md-typescale-label-small {
  font-family: var(--md-ref-typeface-plain);
  font-size: 0.6875rem;
  font-weight: 500;
  line-height: 1.45;
  letter-spacing: 0.5px;
}


/* =============================================== */
/* GLOBAL STYLES & RESETS
/* =============================================== */

/* Modern box-sizing reset */
html {
  box-sizing: border-box;
}
*, *::before, *::after {
  box-sizing: inherit;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  margin: 0;
  background-color: var(--md-sys-color-surface);
  color: var(--md-sys-color-on-surface);
  font-family: var(--md-ref-typeface-plain);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Visually hidden class for accessibility */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Global container */
.container {
  width: min(1080px, 100%);
  margin-inline: auto;
  padding-inline: clamp(var(--space-4), 4vw, var(--space-6));
}


/* =============================================== */
/* LAYOUT: HEADER, MAIN, FOOTER
/* =============================================== */

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in oklab, var(--md-sys-color-surface) 70%, transparent);
  backdrop-filter: saturate(120%) blur(20px);
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
}
.header-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding-block: var(--space-4);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: inherit;
  border-radius: var(--radius-sm);
  transition: background-color var(--md-motion-duration-short4) var(--md-motion-easing-standard);
}
.brand-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #FFFFFF 0%, #F0F0F0 100%);
  box-shadow: var(--md-elev-1);
}
.brand-logo {
  width: 24px;
  height: 24px;
}
.brand-title {
  margin: 0;
  font-family: var(--md-ref-typeface-brand);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.27;
  letter-spacing: 0;
}
.brand-title-accent {
  color: var(--md-sys-color-primary);
}
.brand:focus-visible {
  outline: 3px solid var(--md-sys-color-primary);
  outline-offset: 2px;
}
.brand:hover {
  background-color: color-mix(in oklab, var(--md-sys-color-on-surface) 8%, transparent);
}
.nav-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

@media (min-width: 600px) {
  .header-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

/* --- Main Content --- */
main {
  flex-grow: 1;
  padding-block: clamp(var(--space-6), 8vh, var(--space-8));
}

/* --- Footer --- */
.site-footer {
  padding-block: var(--space-8);
  border-top: 1px solid var(--md-sys-color-outline-variant);
  background: var(--md-sys-color-surface-container-low);
}
.footer-content {
  display: grid;
  gap: var(--space-3);
}
.footer-chips {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}
/* --- Footer Attribution Component --- */
.footer-copyright {
  font-size: 14px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-3); /* Vertical and horizontal gap */
}
.footer-copyright a {
  color: var(--md-sys-color-primary);
  text-decoration: none;
}
.footer-copyright a:hover {
  text-decoration: underline;
}


/* =============================================== */
/* PAGE SECTIONS
/* =============================================== */

/* --- Hero Section --- */
.hero {
  position: relative;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  align-items: center;
  gap: clamp(var(--space-4), 4vw, var(--space-8));
  padding-block: clamp(var(--space-8), 6vw, 72px);
}
.hero-title {
  margin: 0 0 var(--space-3);
}
.hero-subtitle {
  margin: 0 0 var(--space-5);
  color: var(--md-sys-color-on-surface-variant);
}
.chip-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}
.button-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.hero-visual {
  display: grid;
  place-items: center;
  position: relative;
  isolation: isolate;
}
.glow {
  position: absolute;
  inset: 1%;
  z-index: -1;
  background:
    radial-gradient(100% 75% at 70% 30%, color-mix(in oklab, var(--md-sys-color-primary) 25%, transparent), transparent 60%),
    radial-gradient(75% 100% at 20% 70%, color-mix(in oklab, var(--md-sys-color-tertiary) 20%, transparent), transparent 70%);
  filter: blur(20px) saturate(120%);
  opacity: 0.7;
  animation: glowShift 24s var(--md-motion-easing-emphasized) infinite alternate;
}
.phone {
  width: min(320px, 80vw);
  aspect-ratio: 9 / 19.5;
  border-radius: 32px;
  background:
    linear-gradient(135deg, var(--md-sys-color-surface-container-highest), var(--md-sys-color-surface-container)),
    radial-gradient(120% 80% at 30% 10%, color-mix(in oklab, var(--md-sys-color-primary) 8%, transparent), transparent 60%);
  box-shadow: var(--md-elev-3);
  border: 1px solid color-mix(in oklab, var(--md-sys-color-outline-variant) 50%, transparent);
  position: relative;
  overflow: hidden;
  animation: float 6s var(--md-motion-easing-emphasized) infinite;
  transition: transform var(--md-motion-duration-medium2) var(--md-motion-easing-standard);
}
.phone::after {
  content: '';
  position: absolute;
  inset: 2px;
  border-radius: 30px;
  border: 1px solid color-mix(in oklab, black 50%, transparent);
  pointer-events: none;
}

.phone:hover {
  transform: scale(1.02) translateY(-4px);
}
.phone-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-logo-wrapper {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 150px;
  height: 150px;
  margin-bottom: var(--space-4);
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, #FFFFFF 0%, #F0F0F0 100%);
  box-shadow: var(--md-elev-2);
}

.hero-logo {
  width: 96px;
  height: 96px;
}

/* --- Features Section --- */
.features-section {
  padding-block: var(--space-6) var(--space-8);
}
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-8);
}
.feature {
  padding: var(--space-6);
  border-radius: var(--radius-xxl);
  background: 
    radial-gradient(circle at 10% 10%, color-mix(in oklab, var(--md-sys-color-on-surface) 3%, transparent) 0%, transparent 40%),
    var(--md-sys-color-surface-container);
  border: 1px solid var(--md-sys-color-outline-variant);
  box-shadow: var(--md-elev-0);
  transition: transform var(--md-motion-duration-medium1) var(--md-motion-easing-emphasized),
              background-color var(--md-motion-duration-short4) var(--md-motion-easing-standard),
              box-shadow var(--md-motion-duration-short4) var(--md-motion-easing-standard);
  will-change: transform;
}
.feature:hover {
  transform: translateY(-4px) scale(1.01);
  background-color: var(--md-sys-color-surface-container-high);
  box-shadow: var(--md-elev-2);
}
.feature-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}
.feature-header .material-symbols-outlined {
  color: var(--md-sys-color-primary);
  font-size: 28px;
}
.feature-title {
  margin: 0;
}
.feature-description {
  margin: 0;
  color: var(--md-sys-color-on-surface-variant);
  line-height: 1.5;
}

@media (max-width: 900px) {
  .hero { 
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-copy {
    order: 1;
  }
  .hero-visual {
    order: 2;
    margin-top: var(--space-6);
    margin-bottom: var(--space-6);
  }
  .chip-group,
  .button-group {
    justify-content: center;
  }
}

/* --- privacy policy and license page--- */

.content-card {
  background-color: var(--md-sys-color-surface-container-low);
  border: 1px solid var(--md-sys-color-outline-variant);
  padding: clamp(var(--space-6), 6vw, var(--space-8));
  border-radius: 28px; /* --radius-xxl */
}

.content-card h1 {
  margin: 0 0 var(--space-4) 0;
  color: var(--md-sys-color-on-surface);
}

.content-card .intro-text {
  color: var(--md-sys-color-on-surface-variant);
  margin: 0;
}
.intro-text a {
  color: var(--md-sys-color-primary)
}
.intro-text a:hover,
.intro-text a:focus-visible {
  text-decoration: underline;
}

.policy-section {
  margin-block-start: var(--space-8);
}

.policy-section h2 {
  margin: 0 0 var(--space-3) 0;
  color: var(--md-sys-color-on-surface);
}

.policy-section p {
  margin: 0;
  color: var(--md-sys-color-on-surface-variant);
}

/* Add space between consecutive paragraphs inside a section */
.policy-section p + p {
  margin-block-start: var(--space-4);
}

.effective-date {
  color: var(--md-sys-color-on-surface-variant);
  font-style: italic;
}

.content-card a {
  color: var(--md-sys-color-primary);
  text-decoration: none;
  font-weight: 500;
}

.content-card a:hover,
.content-card a:focus-visible {
  text-decoration: underline;
}

.content-card hr {
  border: none;
  height: 1px;
  background-color: var(--md-sys-color-outline-variant);
  margin: var(--space-8) 0;
}
.attribution {
  text-align: center;
  color: var(--md-sys-color-on-surface-variant);
  margin-top: var(--space-6);
}
.content-card pre {
  background-color: var(--md-sys-color-surface-container-high);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  font-family: 'Courier New', Courier, monospace; /* Standard monospace font */
  white-space: pre-wrap; /* Allows long lines to wrap neatly */
  overflow-x: auto; /* Horizontal scroll for overflow */
  color: var(--md-sys-color-on-surface-variant);
}
/* Styling for the license summary list */
.summary-list {
  list-style: none;
  padding-left: 0;
  margin-block-start: var(--space-4);
  display: grid;
  gap: var(--space-3);
}

.summary-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  color: var(--md-sys-color-on-surface-variant);
  font-size: 1rem; /* md-typescale-body-large font-size */
  line-height: 1.5;
}

.summary-list .material-symbols-outlined {
  color: var(--md-sys-color-primary);
  font-size: 24px;
  margin-top: 1px; /* Minor alignment adjustment */
}

/* Trademark Policy Table */
.content-card table {
  width: 100%;
  margin-block-start: var(--space-4);
  border-collapse: collapse;
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--radius-lg);
  overflow: hidden; /* Ensures border-radius is respected by child elements */
}

.content-card th,
.content-card td {
  padding: var(--space-4);
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
}

.content-card th {
  background-color: var(--md-sys-color-surface-container-high);
  font-weight: 500;
  color: var(--md-sys-color-on-surface);
}

.content-card tbody tr:last-child td {
  border-bottom: none;
}

.content-card td .icon-permitted {
  color: var(--md-sys-color-primary); /* Using primary theme color for positive */
  font-weight: 700;
}

.content-card td .icon-restricted {
  color: var(--md-sys-color-error); /* Using error theme color for negative */
  font-weight: 700;
}

.content-card code {
  background-color: var(--md-sys-color-surface-container-low);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  font-family: 'Courier New', Courier, monospace;
}

/* =============================================== */
/* ANIMATIONS & REDUCED MOTION
/* =============================================== */

@keyframes glowShift {
  from { transform: translateY(0) rotate(0deg) scale(1); }
  to   { transform: translateY(-12px) rotate(2deg) scale(1.05); }
}
@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0); }
  50% { transform: translateY(-20px) rotate(0); }
}

@media (prefers-reduced-motion: reduce) {
  .glow, .phone, .feature {
    animation: none;
    transition: none;
  }
  .feature:hover {
    transform: none;
  }
  .phone:hover {
    transform: none;
  }
}


@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(40px) scale(1.05);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/*  Apply the animation and link it to the scroll timeline */
.reveal {
  /* Attach the animation */
  animation: fade-up linear;
  
  /* Link it to the element's visibility in the viewport */
  animation-timeline: view();
  
  /* Define the range: animation starts when the element is 10% visible and ends when it's 30% visible. */
  animation-range: entry 10% cover 30%;
}

/* =============================================== */
/* MATERIAL DESIGN COMPONENTS
/* =============================================== */

/* --- Base Component Styles --- */
.md-assist-chip,
.md-filled-button,
.md-outlined-button,
.md-tonal-button,
.md-text-button {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  box-sizing: border-box;
  font-family: var(--md-ref-typeface-plain);
  font-weight: 500;
  text-decoration: none;
  border: none;
  cursor: pointer;
  outline: none;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  overflow: hidden; /* For ripple effect */
  isolation: isolate;
}

/* Ripple Effect Container */
.md-assist-chip::before,
.md-filled-button::before,
.md-outlined-button::before,
.md-tonal-button::before,
.md-text-button::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--md-motion-duration-short3) var(--md-motion-easing-standard);
  z-index: -1;
}

/* Hover State Layer */
.md-assist-chip:hover::before {
  opacity: 1;
  background-color: color-mix(in oklab, var(--md-sys-color-on-surface) 8%, transparent);
}

.md-filled-button:hover::before {
  opacity: 1;
  background-color: color-mix(in oklab, var(--md-sys-color-on-primary) 8%, transparent);
}

.md-tonal-button:hover::before {
  opacity: 1;
  background-color: color-mix(in oklab, var(--md-sys-color-on-secondary-container) 8%, transparent);
}

.md-outlined-button:hover::before,
.md-text-button:hover::before {
  opacity: 1;
  background-color: color-mix(in oklab, var(--md-sys-color-primary) 8%, transparent);
}

/* Active/Pressed State Layer */
.md-assist-chip:active::before {
  background-color: color-mix(in oklab, var(--md-sys-color-on-surface) 12%, transparent);
}

.md-filled-button:active::before {
  background-color: color-mix(in oklab, var(--md-sys-color-on-primary) 12%, transparent);
}

.md-tonal-button:active::before {
  background-color: color-mix(in oklab, var(--md-sys-color-on-secondary-container) 12%, transparent);
}

.md-outlined-button:active::before,
.md-text-button:active::before {
  background-color: color-mix(in oklab, var(--md-sys-color-primary) 12%, transparent);
}

/* Focus states for keyboard navigation */
.md-assist-chip:focus-visible,
.md-filled-button:focus-visible,
.md-outlined-button:focus-visible,
.md-tonal-button:focus-visible,
.md-text-button:focus-visible {
  outline: 3px solid var(--md-sys-color-primary);
  outline-offset: 2px;
}

/* --- Material Icons Base --- */
.material-symbols-outlined {
  font-family: 'Material Symbols Outlined';
  font-weight: normal;
  font-style: normal;
  font-size: 20px;
  line-height: 1;
  letter-spacing: normal;
  text-transform: none;
  white-space: nowrap;
  direction: ltr;
  display: inline-block;
  vertical-align: middle;
  -webkit-font-feature-settings: 'liga';
  -webkit-font-smoothing: antialiased;
  user-select: none;
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 20;
}

/* Utility class for filled icons */
.material-symbols-outlined.filled {
  font-variation-settings: 'FILL' 1, 'wght' 400, 'GRAD' 0, 'opsz' 20;
}

/* --- Chips --- */
.md-assist-chip {
  height: 32px;
  padding-inline: var(--space-4);
  padding-inline-start: var(--space-2);
  border-radius: var(--radius-sm);
  border: 1px solid var(--md-sys-color-outline);
  background-color: transparent;
  color: var(--md-sys-color-on-surface);
  font-size: 0.875rem;
  line-height: 20px;
  letter-spacing: 0.1px;
  transition: all var(--md-motion-duration-short4) var(--md-motion-easing-standard);
}

.md-assist-chip .material-symbols-outlined {
  font-size: 18px;
  margin-inline-end: -2px;
}

/* Chip active state */
.md-assist-chip:active {
  transform: scale(0.96);
}

/* Active navigation chip */
.nav-chips a.md-assist-chip.active {
  background-color: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
  border-color: transparent;
}

.nav-chips a.md-assist-chip.active::before {
  background-color: color-mix(in oklab, var(--md-sys-color-on-secondary-container) 8%, transparent);
}

/* --- Buttons --- */
.md-filled-button,
.md-outlined-button,
.md-tonal-button,
.md-text-button {
  height: 40px;
  padding-inline: var(--space-6);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  line-height: 20px;
  letter-spacing: 0.1px;
  transition: all var(--md-motion-duration-short4) var(--md-motion-easing-standard);
}

/* Button with icons */
.md-filled-button .material-symbols-outlined,
.md-outlined-button .material-symbols-outlined,
.md-tonal-button .material-symbols-outlined {
  margin-inline-start: -8px;
  margin-inline-end: -4px;
}

.md-text-button .material-symbols-outlined {
  margin-inline-end: -4px;
}

/* Filled Button */
.md-filled-button {
  background-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
  box-shadow: var(--md-elev-1);
  border: none;
}

.md-filled-button:hover {
  box-shadow: var(--md-elev-2);
}

.md-filled-button:active {
  box-shadow: var(--md-elev-1);
  transform: scale(0.96);
}

/* New Filled Tonal Button component */
.md-tonal-button {
  background-color: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
  box-shadow: var(--md-elev-0);
  border: none;
}

.md-tonal-button:hover {
  box-shadow: var(--md-elev-1);
}

.md-tonal-button:active {
  box-shadow: var(--md-elev-0);
  transform: scale(0.96);
}

/* Outlined Button */
.md-outlined-button {
  background-color: transparent;
  color: var(--md-sys-color-primary);
  border: 1px solid var(--md-sys-color-outline);
  box-shadow: none;
}

.md-outlined-button:active {
  transform: scale(0.96);
}

/* Text Button */
.md-text-button {
  background-color: transparent;
  color: var(--md-sys-color-primary);
  padding-inline: var(--space-3);
  border: none;
  box-shadow: none;
}

.md-text-button:active {
  transform: scale(0.96);
}

.md-text-button svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
  margin-inline-start: -2px;
}

/* Disabled state */
.md-filled-button:disabled,
.md-outlined-button:disabled,
.md-tonal-button:disabled,
.md-text-button:disabled,
.md-assist-chip:disabled {
  opacity: 0.38;
  cursor: not-allowed;
  pointer-events: none;
}

/* Ripple Effect Animation */
@keyframes ripple {
  from {
    transform: scale(0);
    opacity: 0.5;
  }
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* Ripple on click (requires JS for full implementation, this is CSS-only approximation) */
.md-filled-button:active::after,
.md-outlined-button:active::after,
.md-tonal-button:active::after,
.md-text-button:active::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  width: 100px;
  height: 100px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 70%);
  animation: ripple var(--md-motion-duration-medium4) var(--md-motion-easing-standard);
  pointer-events: none;
}