/* Modern Optician Design System */
:root {
  /* Colors */
  --color-primary: #1a1a1a;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-background: #ffffff;
  --color-background-alt: #f9f9f9;
  --color-accent: #6B8E23;
  /* Sage Green */
  --color-accent-hover: #556B2F;
  --color-border: #e0e0e0;
  --color-error: #d32f2f;

  /* Typography */
  --font-heading: 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 8rem;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  /* Transitions */
  --transition-fast: 0.2s ease;
}

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

body {
  font-family: var(--font-body);
  color: var(--color-text);
  line-height: 1.6;
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  /* Prevent horizontal scroll */
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  color: var(--color-primary);
  line-height: 1.2;
}

img {
  max-width: 100%;
  display: block;
}

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

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

/* Utilities */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  background-color: var(--color-active, var(--color-primary));
  color: white;
  border-radius: var(--radius-sm);
  font-weight: 500;
  text-align: center;
  transition: background-color var(--transition-fast);
}

.btn:hover {
  background-color: var(--color-accent);
}

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: white;
}

/* Header & Nav */
header {
  padding: var(--spacing-sm) 0;
  position: sticky;
  top: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid var(--color-border);
}

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

.logo-container {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-primary);
}

.logo-icon {
  width: 48px;
  height: auto;
  color: var(--color-accent);
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.logo-main {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.logo-sub {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--color-text-light);
  text-transform: uppercase;
}

nav ul {
  display: flex;
  gap: var(--spacing-md);
  list-style: none;
  align-items: center;
}

nav a {
  font-size: 0.95rem;
  font-weight: 500;
}

nav a:hover,
nav a.active {
  color: var(--color-accent);
}

/* Mobile Menu Toggle */
.mobile-menu-btn {
  display: none;
  font-size: 1.5rem;
  z-index: 1001;
}

/* Hero Section */
.hero {
  min-height: 80vh;
  /* Changed to min-height for mobile */
  position: relative;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -1;
  filter: brightness(0.9);
}

.hero-content {
  background: rgba(255, 255, 255, 0.9);
  padding: var(--spacing-lg);
  max-width: 600px;
  margin-left: var(--spacing-md);
  backdrop-filter: blur(5px);
  border-radius: var(--radius-sm);
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-sm);
}

.hero p {
  font-size: 1.2rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
}

/* Section Common */
section {
  padding: var(--spacing-xl) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.section-title h2 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-xs);
}

.section-title p {
  color: var(--color-text-light);
}

/* Feature Grid (Relaxed Vision & Team) */
.feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  margin-bottom: 4rem;
}

.feature-grid img {
  border-radius: var(--radius-md);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  width: 100%;
}

/* Services */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
}

.service-card {
  padding: var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: transform var(--transition-fast);
}

.service-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
}

.service-icon {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-accent);
}

/* Calendar Section */
#booking {
  background-color: var(--color-background-alt);
}

.calendar-container {
  background: white;
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  max-width: 800px;
  margin: 0 auto;
}

.calendar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
  /* Wrap on small screens */
  gap: 1rem;
}

.dates-grid {
  display: flex;
  gap: var(--spacing-sm);
  overflow-x: auto;
  padding-bottom: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  -webkit-overflow-scrolling: touch;
  /* Smooth scrolling on iOS */
}

.date-card {
  min-width: 80px;
  padding: var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
  /* Prevent shrinking */
}

.date-card:hover {
  border-color: var(--color-accent);
}

.date-card.selected {
  background-color: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

.slots-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  /* Smaller slots for mobile */
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.time-slot {
  padding: var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  text-align: center;
  cursor: pointer;
  font-size: 0.9rem;
}

.time-slot:hover:not(.taken) {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.time-slot.selected {
  background-color: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

.time-slot.taken {
  background-color: #eee;
  color: #aaa;
  cursor: not-allowed;
  text-decoration: line-through;
}

.booking-form {
  display: none;
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-md);
  animation: fadeIn 0.3s ease;
}

.booking-form.active {
  display: block;
}

.form-group {
  margin-bottom: var(--spacing-sm);
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.form-group input {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: inherit;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

/* Footer */
footer {
  background-color: var(--color-primary);
  color: white;
  padding: var(--spacing-lg) 0;
}

footer .container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
}

footer h4 {
  color: white;
  margin-bottom: var(--spacing-sm);
}

footer ul {
  list-style: none;
}

footer li {
  margin-bottom: 0.5rem;
  color: #aaa;
}

/* Tabs */
.calendar-tabs {
  display: flex;
  margin-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--color-border);
}

.tab-btn {
  padding: 10px 20px;
  font-weight: 500;
  color: var(--color-text-light);
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  color: var(--color-primary);
}

.tab-btn.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-accent);
}

.tab-view {
  display: none;
  animation: fadeIn 0.3s ease;
}

.tab-view.active {
  display: block;
}

/* Manage View */
.manage-container {
  padding: var(--spacing-sm);
  max-width: 600px;
  margin: 0 auto;
}

.details-card {
  background: var(--color-background-alt);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin-top: var(--spacing-md);
  border: 1px solid var(--color-border);
}

.details-card h4 {
  margin-bottom: var(--spacing-sm);
  padding-bottom: var(--spacing-xs);
  border-bottom: 1px solid var(--color-border);
}

.details-grid p {
    margin-bottom: 0.5rem;
}

.status-badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 99px;
    font-size: 0.8rem;
    font-weight: bold;
    text-transform: uppercase;
}

.status-badge.confirmed {
    background-color: #e8f5e9;
    color: #2e7d32;
}

.status-badge.cancelled {
    background-color: #ffebee;
    color: #c62828;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  :root {
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
  }

  .mobile-menu-btn {
    display: block;
  }

  /* Full screen mobile menu */
  nav {
    position: fixed;
    top: 0;
    right: -100%;
    height: 100vh;
    width: 80%;
    background: white;
    padding: 2rem;
    transition: right 0.3s ease;
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  nav.active {
    right: 0;
  }

  nav ul {
    flex-direction: column;
    gap: 2rem;
    text-align: center;
  }

  nav a {
    font-size: 1.2rem;
  }

  /* Hero */
  .hero h1 {
    font-size: 2.2rem;
  }

  .hero-content {
    margin: 1rem;
    padding: 2rem;
  }

  /* Feature Grids (Relaxed Vision, Team) */
  .feature-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  /* Order manipulation if needed, e.g. Image first */
  .feature-grid.reverse-mobile div:first-child {
    order: 2;
  }

  .feature-grid.reverse-mobile img {
    order: 1;
  }

  /* Form */
  .form-grid {
    grid-template-columns: 1fr;
  }
}