/*
 * Landgreen Lawncare Design System
 * Plain CSS | Mobile-First | Accessible | No Frameworks
 */

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

:root {
  /* Colors - Natural Greens */
  --color-primary: #2d5016;        /* Deep forest green */
  --color-primary-light: #4a7c2c;  /* Medium green */
  --color-primary-dark: #1a3009;   /* Darker green */
  --color-accent: #6b9f3e;         /* Bright lawn green */
  --color-accent-red: #b91c1c;     /* Deep red accent */
  
  /* Colors - Snow Neutrals */
  --color-neutral-50: #fafafa;
  --color-neutral-100: #f5f5f5;
  --color-neutral-200: #e5e5e5;
  --color-neutral-300: #d4d4d4;
  --color-neutral-400: #a3a3a3;
  --color-neutral-500: #737373;
  --color-neutral-600: #525252;
  --color-neutral-700: #404040;
  --color-neutral-800: #262626;
  --color-neutral-900: #171717;
  
  /* Semantic Colors */
  --color-bg: #ffffff;
  --color-bg-alt: var(--color-neutral-50);
  --color-text: var(--color-neutral-900);
  --color-text-muted: var(--color-neutral-600);
  --color-border: var(--color-neutral-200);
  
  /* CTA Colors */
  --color-cta-primary: var(--color-primary);
  --color-cta-primary-hover: var(--color-primary-dark);
  --color-cta-secondary: var(--color-accent);
  --color-cta-secondary-hover: var(--color-primary-light);
  
  /* Alert/Status */
  --color-success: #16a34a;
  --color-warning: #ea580c;
  --color-error: #dc2626;
  
  /* Typography */
  --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-heading: Georgia, "Times New Roman", serif;
  
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Spacing */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  
  /* Layout */
  --max-width-content: 1200px;
  --max-width-text: 65ch;
  --border-radius-sm: 4px;
  --border-radius: 8px;
  --border-radius-lg: 12px;
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.header__nav-link {
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition-fast);
  text-decoration: none;
}

.header__nav-link:hover,
.header__nav-link:focus {
  border-bottom-color: var(--color-accent-red);
  text-decoration: none;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-heading);
  font-weight: 700;
  line-height: var(--line-height-tight);
  color: var(--color-primary-dark);
  margin-bottom: var(--space-4);
}

h1 { font-size: var(--font-size-4xl); }
h2 { 
  font-size: var(--font-size-3xl); 
  border-bottom: 2px solid var(--color-accent-red);
  padding-bottom: var(--space-2);
}
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

@media (max-width: 768px) {
  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-2xl); }
  h3 { font-size: var(--font-size-xl); }
}

p {
  margin-bottom: var(--space-4);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-light);
  text-decoration: underline;
}

a:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

strong { font-weight: 700; }
em { font-style: italic; }

/* ============================================
   LAYOUT & GRID
   ============================================ */

.container {
  width: 100%;
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-6);
  }
}

.section {
  padding: var(--space-12) 0;
}

.section--alt {
  background-color: var(--color-bg-alt);
}

.section--primary {
  background-color: var(--color-primary-dark);
  color: #ffffff;
}

.section--primary h1,
.section--primary h2,
.section--primary h3 {
  color: #ffffff;
}

.grid {
  display: grid;
  gap: var(--space-6);
}

.grid--2 {
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

.grid--3 {
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.grid--4 {
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid--4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */

.header {
  background-color: #ffffff;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: none;
}

.header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-4);
  max-width: var(--max-width-content);
  margin: 0 auto;
}

.header__logo {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.header__logo:hover {
  color: var(--color-primary-light);
  text-decoration: none;
}

.header__nav {
  display: none;
}

@media (min-width: 768px) {
  .header__logo img {
    height: 36px;
  }
  .header__nav {
    display: flex;
    align-items: center;
    gap: var(--space-6);
  }
}

.header__nav-list {
  display: flex;
  gap: var(--space-6);
  list-style: none;
}

.mobile-nav {
  display: none; /* hidden by default */
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  background: #ffffff;
  border-top: 1px solid var(--color-border);
  box-shadow: var(--shadow);
  z-index: 999;
}

.mobile-nav.is-open,
.mobile-nav.open,
#mobile-nav.is-open,
#mobile-nav.open {
  display: block;
}

@media (min-width: 768px) {
  .mobile-nav {
    display: none !important; /* never show on desktop */
  }
}

.header__logo img {
  display: block;
  height: 28px;
  width: auto;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border: 2px solid transparent;
  border-radius: var(--border-radius);
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--transition-fast),
              color var(--transition-fast),
              border-color var(--transition-fast),
              box-shadow var(--transition-fast);
}

.btn:hover { text-decoration: none; }

.btn--primary {
  background-color: var(--color-cta-primary);
  border-color: var(--color-cta-primary);
  color: #ffffff;
}
.btn--primary:hover {
  background-color: var(--color-cta-primary-hover);
  border-color: var(--color-cta-primary-hover);
}

.btn--secondary {
  background-color: var(--color-cta-secondary);
  border-color: var(--color-cta-secondary);
  color: #ffffff;
}
.btn--secondary:hover {
  background-color: var(--color-cta-secondary-hover);
  border-color: var(--color-cta-secondary-hover);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn--outline:hover {
  background-color: var(--color-primary);
  color: #ffffff;
}

.btn--white {
  background-color: transparent;
  color: #ffffff;
  border-color: #ffffff;
}
.btn--white:hover {
  background-color: #ffffff;
  color: var(--color-primary-dark);
  border-color: #ffffff;
}

.btn--large { padding: var(--space-4) var(--space-8); font-size: var(--font-size-lg); }
.btn--block { display: block; width: 100%; }

.btn:focus-visible {
  outline: 3px solid rgba(255,255,255,0.6);
  outline-offset: 2px;
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  color: #ffffff;
  padding: var(--space-16) 0;
  text-align: center;
}

.hero__title {
  color: #ffffff;
  margin-bottom: var(--space-4);
  font-size: var(--font-size-4xl);
}

@media (min-width: 768px) {
  .hero__title {
    font-size: var(--font-size-5xl);
  }
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--space-6);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero__cta {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: center;
  margin-top: var(--space-8);
}

@media (min-width: 640px) {
  .hero__cta {
    flex-direction: row;
    justify-content: center;
  }
}

.hero__trust {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-6);
  font-size: var(--font-size-sm);
  opacity: 0.9;
}

@media (min-width: 640px) {
  .hero__trust {
    flex-direction: row;
    justify-content: center;
    gap: var(--space-8);
  }
}

/* ============================================
   ALERT BANNER
   ============================================ */

.alert-banner {
  background-color: var(--color-warning);
  color: #ffffff;
  padding: var(--space-3) var(--space-4);
  text-align: center;
  font-weight: 600;
}

.alert-banner--success {
  background-color: var(--color-success);
}

.alert-banner--info {
  background-color: var(--color-primary);
}

/* ============================================
   CARDS
   ============================================ */

.card {
  background-color: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-6);
  transition: box-shadow var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-lg);
}

.card__title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-3);
}

.card__content {
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

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

/* ============================================
   TESTIMONIALS
   ============================================ */

.testimonial {
  background-color: #ffffff;
  padding: var(--space-6);
  border-left: 4px solid var(--color-accent);
  margin-bottom: var(--space-6);
}

.testimonial__text {
  font-style: italic;
  margin-bottom: var(--space-4);
  line-height: var(--line-height-relaxed);
}

.testimonial__author {
  font-weight: 600;
  color: var(--color-primary);
}

.testimonial__location {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* Carousel controls */
.testimonial-carousel {
  position: relative;
}

.testimonial-carousel__controls {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.testimonial-carousel__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--color-neutral-300);
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.testimonial-carousel__dot.is-active,
.testimonial-carousel__dot:hover {
  background-color: var(--color-primary);
}

/* ============================================
   FORMS
   ============================================ */

.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--space-2);
  color: var(--color-text);
}

.form-label--required::after {
  content: " *";
  color: var(--color-error);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-base);
  font-family: var(--font-family-base);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  background-color: #ffffff;
  transition: border-color var(--transition-fast);
  min-height: 48px;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(45, 80, 22, 0.1);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-checkbox-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.form-checkbox {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.form-checkbox input[type="checkbox"] {
  width: 20px;
  height: 20px;
  cursor: pointer;
}

.form-error {
  color: var(--color-error);
  font-size: var(--font-size-sm);
  margin-top: var(--space-2);
}

.form-help {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-2);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  background-color: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.9);
  padding: var(--space-12) 0 var(--space-6) 0;
}

.footer a {
  color: rgba(255, 255, 255, 0.9);
}

.footer a:hover {
  color: #ffffff;
}

.footer__grid {
  display: grid;
  gap: var(--space-8);
  grid-template-columns: 1fr;
  margin-bottom: var(--space-8);
}

@media (min-width: 768px) {
  .footer__grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

.footer__title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: #ffffff;
  margin-bottom: var(--space-4);
}

.footer__list {
  list-style: none;
}

.footer__list-item {
  margin-bottom: var(--space-2);
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  padding-top: var(--space-6);
  text-align: center;
  font-size: var(--font-size-sm);
}

/* ============================================
   UTILITIES
   ============================================ */

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

.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.hidden { display: none; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ============================================
   ACCESSIBILITY
   ============================================ */

/* Skip link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: var(--space-2) var(--space-4);
  text-decoration: none;
  z-index: 1000;
}

.skip-link:focus {
  top: 0;
}

/* Focus visible for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
  .header, .footer, .btn, .mobile-nav {
    display: none;
  }
}