/* ===============================
   GENERAL RESET & BASE STYLES
=============================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-family: 'Roboto', sans-serif;
  scroll-behavior: smooth;
}

:root{
  --unit: 8px;
  --space-1: calc(var(--unit) * 0.5); /* 4px */
  --space-2: var(--unit);            /* 8px */
  --space-3: calc(var(--unit) * 2);  /* 16px */
  --space-4: calc(var(--unit) * 3);  /* 24px */
  --space-5: calc(var(--unit) * 4);  /* 32px */
  --color-primary: #6200EE;
  --color-primary-dark: #3700b3;
  --color-primary-light: #8c45ff;
  --color-secondary: #03DAC6;
  --color-secondary-light: #66fff9;
  --color-accent: #FF6B9D;
  --color-accent-light: #FF9CBE;
  --color-tertiary: #FFB703;
  --color-info: #0077B6;
  --surface: #FFFFFF;
  --surface-dark: #F3E5FF;
  --surface-accent: #E0F7FA;
  --surface-warm: #FFF3E0;
  --background: #F5F5F7;
  --background-gradient: linear-gradient(135deg, #F5F5F7 0%, #E8F5E9 100%);
  --text: #1F1F1F;
  --text-secondary: #555555;

  /* legacy aliases (kept for combined CSS compatibility) */
  --primary: var(--color-primary);
  --accent: var(--color-secondary);

  /* radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-1: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-4: 0 8px 16px rgba(0,0,0,0.08);
  --shadow-6: 0 12px 32px rgba(0,0,0,0.12);
  --motion-standard: 250ms;
  --motion-short: 160ms;
  --motion-easing: cubic-bezier(0.4, 0.0, 0.2, 1);
}

/* Stagger utilities for list/grid reveals - merged into main :root above */

body {
  background: linear-gradient(180deg, #ffffff 0%, #f0f4ff 50%, #fff0f5 100%);
  color: var(--text);
  line-height: 1.7;
  font-weight: 400;
}

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

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

/* ===============================
   HEADER & NAV
=============================== */
.app-bar {
  background: var(--surface);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 999;
  display: flex;
  align-items: center;
  box-shadow: var(--shadow-1);
  border-bottom: 1px solid rgba(0,0,0,0.04);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand .logo {
  width: 40px;
  height: 40px;
}

.main-nav a {
  margin-left: 2rem;
  font-weight: 500;
  transition: color var(--motion-standard) var(--motion-easing);
  color: var(--text-secondary);
  position: relative;
}

.main-nav a:hover {
  color: var(--color-primary);
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--motion-standard) var(--motion-easing);
}

.main-nav a:hover::after {
  width: 100%;
}

/* ===============================
   HERO SECTION
=============================== */
.hero {
  position: relative;
  background: linear-gradient(135deg, #FF6B9D 0%, #6200EE 50%, #03DAC6 100%);
  color: #ffffff;
  padding: 5rem 0;
  overflow: hidden;
}

.hero .hero-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2rem;
}

.hero h1 {
  font-size: 3.2rem;
  margin-bottom: 1.2rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.5px;
}

.hero p.lead {
  font-size: 1.1rem;
  margin-bottom: 2.5rem;
  line-height: 1.8;
  opacity: 0.95;
  max-width: 500px;
}

.hero .actions a {
  margin-right: 1rem;
  padding: 0.6rem 1.2rem;
  border-radius: 4px;
  font-weight: 500;
  transition: all 0.3s;
}

.btn-primary {
  background: linear-gradient(135deg, rgba(255,255,255,0.95) 0%, rgba(255,255,255,0.88) 100%);
  color: var(--color-primary);
  padding: 14px 28px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-4);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--motion-standard) var(--motion-easing);
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  background: linear-gradient(135deg, rgba(255,255,255,1) 0%, rgba(255,255,255,0.95) 100%);
  box-shadow: var(--shadow-6);
  transform: translateY(-2px);
}

.btn-primary:active {
  transform: scale(0.96);
  box-shadow: var(--shadow-2);
}

.btn-outline {
  border: 2px solid rgba(255,255,255,0.4);
  color: #ffffff;
  background: transparent;
  padding: 12px 26px;
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--motion-standard) var(--motion-easing);
  cursor: pointer;
}

.btn-outline:hover {
  background-color: rgba(255, 255, 255, 0.15);
  border-color: rgba(255,255,255,0.6);
  transform: translateY(-2px);
}

.btn-outline:active {
  transform: scale(0.96);
  background-color: rgba(255, 255, 255, 0.2);
}

/* Hero blobs */
.hero .blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.6;
}

.hero .b1 {
  width: 300px;
  height: 300px;
  background: #ff80ab;
  top: -50px;
  left: -100px;
}

.hero .b2 {
  width: 400px;
  height: 400px;
  background: #b388ff;
  bottom: -100px;
  right: -150px;
}

.hero .b3 {
  width: 200px;
  height: 200px;
  background: #ffab40;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/* ===============================
   SECTIONS
=============================== */
.section {
  padding: 5rem 0;
  position: relative;
}

.section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
  opacity: 0.3;
}

/* Section-specific background colors */
.palette-section {
  background: linear-gradient(135deg, rgba(98, 0, 238, 0.05) 0%, rgba(3, 218, 198, 0.05) 100%);
}

.about-section {
  background: linear-gradient(135deg, rgba(255, 107, 157, 0.05) 0%, rgba(255, 183, 3, 0.05) 100%);
}

.components-section {
  background: linear-gradient(135deg, rgba(0, 119, 182, 0.05) 0%, rgba(3, 218, 198, 0.05) 100%);
}

.gallery-section {
  background: linear-gradient(135deg, rgba(255, 183, 3, 0.05) 0%, rgba(255, 107, 157, 0.05) 100%);
}

.resources-section {
  background: linear-gradient(135deg, rgba(98, 0, 238, 0.08) 0%, rgba(255, 183, 3, 0.08) 100%);
}

.section-title {
  font-size: 2.8rem;
  margin-bottom: 3.5rem;
  text-align: center;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary), var(--color-accent));
  background-clip: text;
  /* stylelint-disable-next-line property-no-vendor-prefix */
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -1.2rem;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary), var(--color-accent));
  border-radius: 2px;
  box-shadow: 0 4px 12px rgba(98, 0, 238, 0.2);
}

/* ===============================
   GRID & CARDS
=============================== */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2.5rem;
}

.grid-3 .card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  padding: 1.5rem;
  position: relative;
  cursor: pointer;
  transition: all var(--motion-standard) var(--motion-easing);
  box-shadow: var(--shadow-1);
  border: 1px solid rgba(0,0,0,0.04);
}

.grid-3 .card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left var(--motion-standard) var(--motion-easing);
  pointer-events: none;
  z-index: 2;
}

.grid-3 .card:hover::before {
  left: 100%;
}

.grid-3 .card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-6);
}

.grid-3 .card img {
  max-width: 100%;
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  transition: all var(--motion-standard) var(--motion-easing);
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.grid-3 .card:hover img {
  transform: scale(1.08);
}

.grid-3 .card h3 {
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.grid-3 .card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ===============================
   ELEVATION
=============================== */
.elevation-1 { box-shadow: var(--shadow-1); }
.elevation-2 { box-shadow: var(--shadow-1); }
.elevation-4 { box-shadow: var(--shadow-4); }
.elevation-6 { box-shadow: var(--shadow-6); }

/* ===============================
   FOOTER
=============================== */
.footer {
  background: #ffffff;
  text-align: center;
  padding: 2rem 0;
  font-size: 0.9rem;
}

/* ===============================
   FAB (Back to top)
=============================== */
.fab {
  position: fixed;
  bottom: 2.5rem;
  right: 2.5rem;
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #ffffff;
  font-size: 1.5rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--motion-standard) var(--motion-easing);
  z-index: 100;
  box-shadow: var(--shadow-6);
  border: none;
  animation: float 3s ease-in-out infinite;
}

.fab:hover {
  box-shadow: var(--shadow-6);
  transform: scale(1.12) translateY(-3px);
  animation: none;
}

/* ===============================
   ANIMATIONS
=============================== */
.animate {
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--motion-standard) var(--motion-easing);
}

.animate.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===============================
   GALLERY / IMAGE CARDS
   Material-style image grid and large hero card
=============================== */
.gallery-hero {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 2rem;
  align-items: center;
}

.gallery-hero .hero-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-4);
  overflow: hidden;
  transition: all var(--motion-standard) var(--motion-easing);
  position: relative;
}

.gallery-hero .hero-card:hover {
  box-shadow: var(--shadow-6);
  transform: translateY(-4px);
}

.gallery-hero .hero-image {
  width: 100%;
  height: 320px;
  border-radius: 12px;
  object-fit: cover;
  display: block;
  transition: all var(--motion-standard) var(--motion-easing);
  filter: brightness(0.98);
}

.gallery-hero .hero-card:hover .hero-image {
  filter: brightness(1.02);
  transform: scale(1.02);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.image-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  box-shadow: var(--shadow-1);
  transition: all var(--motion-standard) var(--motion-easing);
  border: 1px solid rgba(0,0,0,0.04);
  cursor: pointer;
}

.image-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(98, 0, 238, 0);
  transition: background var(--motion-standard) var(--motion-easing);
  pointer-events: none;
  z-index: 2;
}

.image-card:hover {
  transform: translateY(-8px) scale(1.03);
  box-shadow: var(--shadow-6);
}

.image-card:hover::after {
  background: rgba(98, 0, 238, 0.08);
}

.image-card .img-aspect {
  width: 100%;
  height: 0;
  padding-bottom: 66.66%; /* 3:2 */
  position: relative;
  background: linear-gradient(135deg, rgba(98,0,238,0.05), rgba(3,218,198,0.05));
  overflow: hidden;
}

.image-card img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: all var(--motion-standard) var(--motion-easing);
}

.image-card:hover img {
  transform: scale(1.1);
  filter: brightness(1.05);
}

.image-card .caption {
  padding: 1rem 1.25rem;
  font-weight: 600;
  color: var(--text);
  font-size: 0.95rem;
}

/* subtle image placeholder effect for lazy load (if used) */
.img-blur {
  filter: blur(8px) saturate(0.9);
  transform: scale(1.02);
}

/* ===============================
   EXAMPLE CARD STYLES
=============================== */
.example-card .img-wrap {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-md);
  margin-bottom: 1.2rem;
  height: 200px;
}

.example-card .img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: all var(--motion-standard) var(--motion-easing);
  display: block;
}

.example-card:hover .img-wrap img {
  transform: scale(1.1) rotate(1deg);
  filter: brightness(1.05);
}

.example-card .img-overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(98, 0, 238, 0.9);
  color: white;
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 0.85rem;
  opacity: 0;
  transition: opacity var(--motion-standard) var(--motion-easing);
  pointer-events: none;
  backdrop-filter: blur(8px);
  z-index: 3;
  letter-spacing: 0.5px;
}

.example-card:hover .img-overlay {
  opacity: 1;
}

.example-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--text);
  font-weight: 700;
}

.example-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ===============================
   MINI CARD INTERACTIVE STYLES
=============================== */
.mini-card {
  transition: all var(--motion-standard) var(--motion-easing);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.mini-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle, rgba(255,255,255,0.2) 0%, transparent 70%);
  opacity: 0;
  transition: opacity var(--motion-standard) var(--motion-easing);
  pointer-events: none;
  z-index: 1;
}

.mini-card:hover {
  transform: translateY(-6px) scale(1.05);
  box-shadow: 0 16px 32px rgba(0,0,0,0.15) !important;
}

.mini-card:hover::after {
  opacity: 1;
}

/* ===============================
   RIPPLE EFFECT
=============================== */
.ripple {
  position: relative;
  overflow: hidden;
}

.ripple-effect {
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,0.5);
  transform: scale(0);
  animation: ripple var(--motion-short) linear;
  pointer-events: none;
}

@keyframes ripple {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* ===============================
   RESPONSIVE
=============================== */

/* Active nav state */
.main-nav a.active::after {
  width: 100%;
}

.main-nav a.active {
  color: var(--color-primary);
  font-weight: 600;
}

@media (max-width: 768px) {
  .hero .hero-inner {
    flex-direction: column;
    text-align: center;
  }

  .main-nav a {
    margin-left: 1rem;
  }
}

@media (max-width: 980px) {
  .gallery-hero {
    grid-template-columns: 1fr;
  }

  .gallery-hero .hero-image {
    height: 240px;
  }
}

@media (max-width: 560px) {
  .gallery-grid {
    gap: 0.75rem;
  }
}

/* ===============================
   ADDITIONAL MATERIAL ANIMATIONS
=============================== */

/* Floating animation for FAB */
@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-6px);
  }
}

/* Fab animation and hover styles defined above in main .fab declaration */

/* Icon box styling for about cards */
.icon-box {
  width: 100px;
  height: 100px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.5rem;
  margin-left: auto;
  margin-right: auto;
  transition: all var(--motion-standard) var(--motion-easing);
  box-shadow: var(--shadow-4);
}

.about-card:hover .icon-box {
  transform: scale(1.1) rotate(-5deg);
  box-shadow: var(--shadow-6);
}

  /* ===============================
     KEYBOARD FOCUS & ACCESSIBILITY
  =============================== */
  .btn-primary:focus-visible,
  .btn-outline:focus-visible,
  .fab:focus-visible,
  .main-nav a:focus-visible,
  .card:focus-visible,
  .ripple:focus-visible,
  button:focus-visible,
  a:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
    box-shadow: 0 0 0 3px rgba(98, 0, 238, 0.15);
  }

  /* Fallback for browsers without focus-visible */
  .btn-primary:focus,
  .btn-outline:focus,
  .fab:focus,
  .main-nav a:focus,
  button:focus {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
  }