/* ==========================================
   CHARLIE CROWLEY PORTFOLIO - DESIGN SYSTEM
   Modern EdTech Aesthetic with Full Design Principles
   ========================================== */

/* ==========================================
   1. CSS CUSTOM PROPERTIES (Design Tokens)
   ========================================== */

:root {
  /* Primary Color - Vibrant Orange (10% of interface) */
  --orange-50: #FFE5CA;
  --orange-100: #FFCC95;
  --orange-200: #FFB260;
  --orange-300: #FF982B;
  --orange-400: #FC8B09;
  --orange-500: #f77f00; /* Primary brand color - EdTech energy */
  --orange-600: #C46500;
  --orange-700: #934C00;
  --orange-800: #623300;
  --orange-900: #311900;

  /* Secondary Color - Golden Xanthous (Part of 30%) */
  --yellow-50: #FEF3DB;
  --yellow-100: #FEE6B7;
  --yellow-200: #FDDA92;
  --yellow-300: #FDCD6E;
  --yellow-400: #FCC758;
  --yellow-500: #fcbf49; /* Secondary brand color - Achievement/learning */
  --yellow-600: #FBAB0A;
  --yellow-700: #C18203;
  --yellow-800: #815602;
  --yellow-900: #402B01;

  /* Accent Color - Fire Red (Important CTAs) */
  --red-50: #F7D4D4;
  --red-100: #EFA9A9;
  --red-200: #E77E7E;
  --red-300: #DF5353;
  --red-400: #DC3C3C;
  --red-500: #d62828; /* Accent brand color - Energy/alerts */
  --red-600: #AC2020;
  --red-700: #811818;
  --red-800: #561010;
  --red-900: #2B0808;

  /* Neutral Colors - Warm Tones (60% of interface) */
  --neutral-50: #FBF9F1;   /* Page background - Shade 1 (lightest vanilla) */
  --neutral-100: #F7F4E3;  /* Container backgrounds - Shade 2 */
  --neutral-200: #F3EED4;  /* Light borders, dividers */
  --neutral-300: #EEE8C6;  /* Subtle backgrounds */
  --neutral-400: #EAE2B7;  /* Base vanilla color */
  --neutral-500: #B8A34D;  /* Medium neutral - darker for better contrast */
  --neutral-600: #8B7420;  /* Text on light backgrounds - much darker */
  --neutral-700: #5A4D15;  /* Secondary text - darker for readability */
  --neutral-800: #3D3410;  /* Primary text - much darker */
  --neutral-900: #1F1A08;  /* Darkest text - near black for maximum contrast */

  /* Prussian Blue - Information & Trust */
  --blue-50: #A7E0FF;
  --blue-100: #50C2FF;
  --blue-200: #00A0F7;
  --blue-300: #00679F;
  --blue-400: #004A73;
  --blue-500: #003049; /* Prussian blue - Professional depth */
  --blue-600: #002539;
  --blue-700: #001C2B;
  --blue-800: #00131D;
  --blue-900: #00090E;

  /* Semantic Colors */
  --color-success: #10B981; /* Keep green for success */
  --color-warning: var(--yellow-500); /* Xanthous for warnings */
  --color-info: var(--blue-500); /* Prussian blue for info */
  --color-error: var(--red-500); /* Fire red for errors */

  /* Color Layering Shades (4-layer depth system) */
  --shade-1: var(--neutral-50);      /* Deepest - page background (warm vanilla) */
  --shade-2: #FFFFFF;                /* Medium - containers */
  --shade-3: var(--neutral-100);     /* Light - interactive elements */
  --shade-4: var(--orange-50);       /* Lightest - hover/selected (warm orange tint) */

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

  /* Font Sizes */
  --text-display: 4.5rem;    /* 72px */
  --text-h1: 3rem;           /* 48px */
  --text-h2: 2.25rem;        /* 36px */
  --text-h3: 1.875rem;       /* 30px */
  --text-h4: 1.5rem;         /* 24px */
  --text-h5: 1.25rem;        /* 20px */
  --text-body-lg: 1.125rem;  /* 18px */
  --text-body: 1rem;         /* 16px */
  --text-body-sm: 0.875rem;  /* 14px */
  --text-caption: 0.75rem;   /* 12px */

  /* Font Weights */
  --weight-light: 300;
  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;

  /* Spacing */
  --space-xs: 0.25rem;   /* 4px */
  --space-sm: 0.5rem;    /* 8px */
  --space-md: 1rem;      /* 16px */
  --space-lg: 1.5rem;    /* 24px */
  --space-xl: 2rem;      /* 32px */
  --space-2xl: 3rem;     /* 48px */
  --space-3xl: 4rem;     /* 64px */
  --space-4xl: 6rem;     /* 96px */
  --space-5xl: 8rem;     /* 128px */

  /* Two-Layer Shadow System */
  --shadow-small:
    inset 0 1px 0 rgba(255, 255, 255, 0.1),
    0 1px 2px rgba(0, 0, 0, 0.1);

  --shadow-medium:
    inset 0 1px 0 rgba(255, 255, 255, 0.15),
    0 3px 6px rgba(0, 0, 0, 0.15);

  --shadow-large:
    inset 0 2px 0 rgba(255, 255, 255, 0.2),
    0 6px 12px rgba(0, 0, 0, 0.2);

  --shadow-xl:
    inset 0 2px 0 rgba(255, 255, 255, 0.25),
    0 10px 20px rgba(0, 0, 0, 0.25);

  /* Border Radius */
  --radius-sm: 0.375rem;   /* 6px */
  --radius-md: 0.5rem;     /* 8px */
  --radius-lg: 0.75rem;    /* 12px */
  --radius-xl: 1rem;       /* 16px */
  --radius-2xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-medium: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
  --transition-spring: 300ms cubic-bezier(0.68, -0.55, 0.265, 1.55);

  /* Responsive Breakpoints */
  --breakpoint-mobile: 640px;
  --breakpoint-tablet: 1024px;
  --breakpoint-desktop: 1440px;

  /* Layout */
  --container-max: 1280px;
  --container-padding: var(--space-xl);
}

/* ==========================================
   2. RESET & BASE STYLES
   ========================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-body);
  font-weight: var(--weight-regular);
  line-height: 1.6;
  color: var(--neutral-700);
  background-color: var(--shade-1); /* Color layering: Shade 1 (deepest) */
  overflow-x: hidden;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--weight-bold);
  line-height: 1.2;
  color: var(--neutral-900);
}

h1 { font-size: var(--text-h1); }
h2 { font-size: var(--text-h2); }
h3 { font-size: var(--text-h3); }
h4 { font-size: var(--text-h4); }
h5 { font-size: var(--text-h5); }

/* Links */
a {
  color: var(--orange-600);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--orange-700);
}

a:focus-visible {
  outline: 2px solid var(--orange-500);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Lists */
ul, ol {
  list-style: none;
}

/* Skip Link for Accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--orange-600);
  color: white;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  z-index: 100;
  font-weight: var(--weight-semibold);
}

.skip-link:focus {
  top: var(--space-sm);
  left: var(--space-sm);
}

/* ==========================================
   3. LAYOUT UTILITIES
   ========================================== */

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* ==========================================
   4. NAVIGATION
   ========================================== */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.9); /* Shade 2 with transparency */
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-small);
  height: 4rem;
  display: flex;
  align-items: center;
}

.nav__container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav__logo-text {
  font-size: var(--text-h5);
  font-weight: var(--weight-bold);
  color: var(--neutral-900);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav__toggle-line {
  width: 24px;
  height: 2px;
  background: var(--neutral-700);
  transition: all var(--transition-fast);
}

.nav__menu {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
}

.nav__link {
  font-weight: var(--weight-medium);
  color: var(--neutral-700);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav__link:hover {
  color: var(--orange-600);
  background: var(--shade-3); /* Color layering: Shade 3 (interactive) */
}

.nav__link--cta {
  background: var(--orange-600);
  color: white;
  padding: var(--space-sm) var(--space-lg);
}

.nav__link--cta:hover {
  background: var(--orange-700);
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
}

/* ==========================================
   5. HERO SECTION
   ========================================== */

.hero {
  padding: var(--space-5xl) 0 var(--space-4xl);
  background: linear-gradient(135deg, var(--orange-50) 0%, var(--shade-1) 50%, var(--orange-50) 100%);
}

.hero__container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.hero__label {
  font-size: var(--text-body);
  font-weight: var(--weight-medium);
  color: var(--orange-600);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
}

.hero__title {
  margin-bottom: var(--space-lg);
}

.hero__name {
  display: block;
  font-size: var(--text-display);
  color: var(--neutral-900);
  line-height: 1;
}

.hero__subtitle {
  display: block;
  font-size: var(--text-h2);
  color: var(--orange-600);
  font-weight: var(--weight-semibold);
  margin-top: var(--space-md);
}

.hero__description {
  font-size: var(--text-body-lg);
  color: var(--neutral-600);
  margin-bottom: var(--space-2xl);
  max-width: 600px;
}

.hero__actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.hero__visual {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: var(--space-lg);
  position: relative;
}

.hero__card {
  background: var(--shade-2); /* Shade 2: Container */
  padding: var(--space-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-medium);
  transition: all var(--transition-medium);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.hero__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-large);
}

.hero__card--1 {
  grid-column: 1 / 3;
}

.hero__card--2 {
  grid-column: 1;
}

.hero__card--3 {
  grid-column: 2;
}

.hero__card-icon {
  font-size: 2.5rem;
  flex-shrink: 0;
  color: var(--orange-600);
}

.hero__card-icon svg,
.hero__card-icon i {
  display: block;
}

.hero__card-label {
  font-size: var(--text-caption);
  color: var(--neutral-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: var(--weight-medium);
}

.hero__card-value {
  font-size: var(--text-h4);
  font-weight: var(--weight-bold);
  color: var(--neutral-900);
}

/* ==========================================
   6. BUTTONS (Component with Two-Layer Shadows)
   ========================================== */

.button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--text-body);
  font-weight: var(--weight-semibold);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  font-family: inherit;
}

.button--primary {
  background: var(--orange-600);
  color: white;
  box-shadow: var(--shadow-medium);
}

.button--primary:hover {
  background: var(--orange-700);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-large);
}

.button--primary:active {
  background: var(--orange-800);
  color: white;
  transform: translateY(0);
  box-shadow: var(--shadow-small);
}

.button--primary:focus {
  color: white;
  outline: 2px solid var(--orange-600);
  outline-offset: 2px;
}

.button--primary:visited {
  color: white;
}

.button--secondary {
  background: var(--shade-2);
  color: var(--neutral-700);
  box-shadow: var(--shadow-small);
  border: 1px solid var(--neutral-200);
}

.button--secondary:hover {
  background: var(--shade-3); /* Shade 3: Interactive */
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
}

.button--large {
  padding: var(--space-md) var(--space-2xl);
  font-size: var(--text-body-lg);
}

.button__icon {
  flex-shrink: 0;
}

/* ==========================================
   7. SECTION HEADERS
   ========================================== */

.section__header {
  margin-bottom: var(--space-3xl);
}

.section__header--center {
  text-align: center;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--space-3xl);
}

.section__label {
  display: inline-block;
  font-size: var(--text-body-sm);
  font-weight: var(--weight-semibold);
  color: var(--orange-600);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-md);
}

.section__title {
  margin-bottom: var(--space-md);
}

.section__description {
  font-size: var(--text-body-lg);
  color: var(--neutral-600);
}

/* ==========================================
   8. ABOUT SECTION
   ========================================== */

.about {
  padding: var(--space-5xl) 0;
  background: var(--shade-2); /* Shade 2: Container on Shade 1 background */
}

.about__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
  gap: var(--space-xl);
}

.about__card {
  background: var(--shade-3); /* Shade 3: One level up for emphasis */
  padding: var(--space-2xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-small);
  transition: all var(--transition-medium);
}

.about__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-large);
  background: var(--shade-4); /* Shade 4: Hover state */
}

.about__card-icon {
  font-size: 3rem;
  margin-bottom: var(--space-lg);
  color: var(--orange-600);
}

.about__card-icon svg,
.about__card-icon i {
  display: block;
}

.about__card-title {
  font-size: var(--text-h4);
  margin-bottom: var(--space-md);
  color: var(--neutral-900);
}

.about__card-text {
  color: var(--neutral-600);
  line-height: 1.7;
}

.about__focus {
  margin-top: var(--space-3xl);
  padding: var(--space-2xl);
  background: var(--shade-3); /* Same as cards above */
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-small);
  transition: all var(--transition-medium);
}

.about__focus:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-large);
  background: var(--shade-4);
}

.about__focus-icon {
  font-size: 3rem;
  margin-bottom: var(--space-lg);
  color: var(--orange-600);
}

.about__focus-icon svg,
.about__focus-icon i {
  display: block;
}

.about__focus-title {
  font-size: var(--text-h4);
  margin-bottom: var(--space-md);
  color: var(--neutral-900);
}

.about__focus-text {
  color: var(--neutral-600);
  line-height: 1.7;
}

/* ==========================================
   9. ESL ECOSYSTEM SECTION
   ========================================== */

.ecosystem {
  padding: var(--space-5xl) 0;
  background: var(--shade-1);
}

.ecosystem__architecture {
  background: var(--shade-2);
  padding: var(--space-3xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-medium);
  margin-bottom: var(--space-3xl);
}

.ecosystem__arch-card {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.ecosystem__arch-card--database {
  background: linear-gradient(135deg, #FDB976, #F59E52);
  color: var(--neutral-900);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-large);
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

.ecosystem__arch-title {
  font-size: var(--text-h3);
  margin-bottom: var(--space-sm);
}

.ecosystem__arch-text {
  font-size: var(--text-body);
  opacity: 0.9;
  margin-bottom: var(--space-md);
}

.ecosystem__arch-badge {
  display: inline-block;
  background: rgba(0, 0, 0, 0.1);
  color: var(--neutral-800);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  font-size: var(--text-body-sm);
  font-weight: var(--weight-semibold);
}

.ecosystem__arch-apps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 180px), 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

.ecosystem__arch-app {
  background: var(--shade-3);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: var(--weight-medium);
  box-shadow: var(--shadow-small);
  transition: all var(--transition-fast);
}

.ecosystem__arch-app:hover {
  background: var(--shade-4);
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
}

.ecosystem__arch-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--orange-500);
  flex-shrink: 0;
}

.ecosystem__arch-features {
  display: flex;
  justify-content: center;
  gap: var(--space-2xl);
  flex-wrap: wrap;
}

.ecosystem__arch-feature {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--neutral-700);
  font-weight: var(--weight-medium);
}

.ecosystem__arch-icon {
  color: var(--orange-600);
}

.ecosystem__features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
  gap: var(--space-lg);
}

.ecosystem__feature {
  background: var(--shade-2);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-small);
}

.ecosystem__feature-title {
  font-size: var(--text-h5);
  margin-bottom: var(--space-sm);
  color: var(--neutral-900);
}

.ecosystem__feature-text {
  color: var(--neutral-600);
}

/* ==========================================
   10. PROJECTS SECTION
   ========================================== */

.projects {
  padding: var(--space-5xl) 0;
  background: var(--shade-2);
}

.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 400px), 1fr));
  gap: var(--space-xl);
}

.project-card {
  background: var(--shade-3);
  padding: var(--space-2xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-medium);
  transition: all var(--transition-medium);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-large);
}

.project-card--featured {
  grid-column: span 1;
  background: linear-gradient(to bottom, var(--shade-4), var(--shade-3));
  border: 2px solid var(--yellow-200);
}

.project-card__header-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
}

.project-card__title {
  font-size: var(--text-h3);
  color: var(--neutral-900);
}

.project-card__subtitle {
  font-size: var(--text-body);
  color: var(--neutral-600);
  font-weight: var(--weight-medium);
}

.project-card__description {
  color: var(--neutral-600);
  line-height: 1.7;
}

.project-card__features {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.project-card__feature {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--neutral-700);
  font-size: var(--text-body-sm);
}

.project-card__feature-icon {
  flex-shrink: 0;
  color: var(--color-success);
}

.project-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: auto;
}

.tech-badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  background: var(--orange-50);
  color: var(--orange-700);
  border-radius: var(--radius-full);
  font-size: var(--text-caption);
  font-weight: var(--weight-medium);
  border: 1px solid var(--yellow-200);
}

.project-card__footer {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  padding-top: var(--space-md);
  border-top: 1px solid var(--neutral-200);
}

.project-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--neutral-700);
  font-size: var(--text-body-sm);
  font-weight: var(--weight-medium);
  transition: color var(--transition-fast);
}

.project-card__link:hover {
  color: var(--orange-600);
}

.project-card__link--primary {
  color: var(--orange-600);
  font-weight: var(--weight-semibold);
}

.project-card__link--primary:hover {
  color: var(--orange-700);
}

.project-card__link-icon {
  width: 16px;
  height: 16px;
}

/* ==========================================
   11. BADGES (Status Indicators)
   ========================================== */

.badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  font-size: var(--text-caption);
  font-weight: var(--weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge--success {
  background: rgba(16, 185, 129, 0.1);
  color: #047857;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge--info {
  background: rgba(252, 191, 73, 0.15);
  color: var(--yellow-700);
  border: 1px solid var(--yellow-300);
}

.badge--concept {
  background: rgba(130, 116, 38, 0.1);
  color: var(--neutral-700);
  border: 1px solid var(--neutral-400);
}

/* ==========================================
   12. SKILLS SECTION
   ========================================== */

.skills {
  padding: var(--space-5xl) 0;
  background: var(--shade-1);
}

.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 350px), 1fr));
  gap: var(--space-xl);
}

.skill-card {
  background: var(--shade-2);
  padding: var(--space-2xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-medium);
  transition: all var(--transition-medium);
}

.skill-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-large);
}

.skill-card__icon {
  font-size: 3rem;
  margin-bottom: var(--space-lg);
  color: var(--orange-600);
}

.skill-card__icon svg,
.skill-card__icon i {
  display: block;
}

.skill-card__title {
  font-size: var(--text-h4);
  margin-bottom: var(--space-lg);
  color: var(--neutral-900);
}

.skill-card__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.skill-card__list li {
  color: var(--neutral-600);
  padding-left: var(--space-lg);
  position: relative;
}

.skill-card__list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--orange-600);
  font-weight: var(--weight-bold);
}

/* ==========================================
   13. CONTACT SECTION
   ========================================== */

.contact {
  padding: var(--space-5xl) 0;
  background: var(--shade-2);
}

.contact__content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.contact__header {
  margin-bottom: var(--space-3xl);
}

.contact__actions {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-2xl);
}

.contact__info {
  display: flex;
  justify-content: center;
  gap: var(--space-2xl);
  flex-wrap: wrap;
}

.contact__info-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--neutral-600);
  font-size: var(--text-body-sm);
}

.contact__info-icon {
  color: var(--orange-600);
  flex-shrink: 0;
}

/* ==========================================
   14. FOOTER
   ========================================== */

.footer {
  background: var(--neutral-900);
  color: var(--neutral-400);
  padding: var(--space-2xl) 0;
}

.footer__content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-lg);
}

.footer__text {
  font-size: var(--text-body-sm);
}

.footer__links {
  display: flex;
  gap: var(--space-lg);
}

.footer__link {
  color: var(--neutral-400);
  font-size: var(--text-body-sm);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: white;
}

/* ==========================================
   15. RESPONSIVE DESIGN
   ========================================== */

/* Tablet (641-1024px) */
@media (max-width: 1024px) {
  :root {
    --container-padding: var(--space-lg);
    --text-display: 3.5rem;
    --text-h1: 2.5rem;
    --text-h2: 2rem;
  }

  .hero__container {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .hero__name {
    font-size: 3.5rem;
  }

  .hero__visual {
    grid-template-columns: 1fr;
  }

  .hero__card--1 {
    grid-column: 1;
  }

  .projects__grid {
    grid-template-columns: 1fr;
  }

  .skills__grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }
}

/* Mobile (0-640px) */
@media (max-width: 640px) {
  :root {
    --container-padding: var(--space-md);
    --text-display: 2.5rem;
    --text-h1: 2rem;
    --text-h2: 1.75rem;
    --text-h3: 1.5rem;
    --text-h4: 1.25rem;
    --space-4xl: 3rem;
    --space-5xl: 4rem;
  }

  /* Navigation - Mobile optimized */
  .nav__toggle {
    display: flex;
    padding: var(--space-md); /* Larger touch target */
  }

  .nav__menu {
    position: fixed;
    top: 4rem;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: var(--space-xl);
    box-shadow: var(--shadow-large);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-medium);
  }

  .nav__menu.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav__item {
    padding: var(--space-sm) 0;
  }

  .nav__link {
    display: block;
    padding: var(--space-md);
    font-size: var(--text-body-lg);
  }

  /* Hero - Mobile optimized */
  .hero {
    padding: var(--space-4xl) 0 var(--space-3xl);
  }

  .hero__name {
    font-size: 2.5rem;
    line-height: 1.1;
  }

  .hero__subtitle {
    font-size: var(--text-h3);
  }

  .hero__description {
    font-size: var(--text-body);
    margin-bottom: var(--space-xl);
  }

  .hero__actions {
    flex-direction: column;
    gap: var(--space-md);
  }

  /* Buttons - Full width with better touch targets */
  .button {
    width: 100%;
    justify-content: center;
    padding: var(--space-md) var(--space-lg);
    font-size: var(--text-body);
  }

  /* Hero cards - Single column on mobile */
  .hero__visual {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .hero__card {
    padding: var(--space-lg);
  }

  .hero__card--1,
  .hero__card--2,
  .hero__card--3 {
    grid-column: 1;
  }

  .hero__card-icon {
    font-size: 2rem;
  }

  .hero__card-value {
    font-size: var(--text-h5);
  }

  /* Cards - Reduce padding on mobile */
  .about__card,
  .project-card,
  .skill-card {
    padding: var(--space-xl);
  }

  .ecosystem__architecture {
    padding: var(--space-xl);
  }

  .ecosystem__arch-card--database {
    padding: var(--space-lg);
  }

  .ecosystem__feature {
    padding: var(--space-lg);
  }

  /* Grid layouts - Force single column */
  .about__grid,
  .ecosystem__arch-apps,
  .ecosystem__features,
  .projects__grid,
  .skills__grid {
    grid-template-columns: 1fr;
  }

  .ecosystem__arch-features {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
  }

  /* Project cards - Better mobile layout */
  .project-card__header-top {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }

  .project-card__title {
    font-size: var(--text-h4);
  }

  .project-card__badges {
    flex-wrap: wrap;
  }

  /* Contact section */
  .contact__actions {
    flex-direction: column;
    width: 100%;
    gap: var(--space-md);
  }

  .contact__info {
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
  }

  /* Footer */
  .footer__content {
    flex-direction: column;
    text-align: center;
    gap: var(--space-lg);
  }

  .footer__links {
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
  }
}

/* ==========================================
   16. ANIMATIONS & INTERACTIONS
   ========================================== */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Scroll reveal animations (applied via JS) */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all var(--transition-slow);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================
   17. UTILITY CLASSES
   ========================================== */

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

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }