/* Simulations With You - Main Stylesheet */
/* INSTRUCTION.md Color Palette & Design System */

/* ========================================
   CSS Variables
   ======================================== */
:root {
  /* Colors - INSTRUCTION.md */
  --color-bg: #1a202c;
  --color-text: #e5e7eb;
  --color-text-emphasis: #ffffff;
  --color-mint: #7dd3c0;
  --color-coral: #ffb4a2;
  --color-teal: #4a9b9b;

  /* Additional colors for gradients and UI */
  --color-soft-blue: #a0e7e5;
  --color-card-bg: #192b33;
  --color-subtle: #325567;
  --color-text-muted: #92b7c9;
  --color-border: rgba(255, 255, 255, 0.1);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;

  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;

  /* Typography */
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ========================================
   Reset & Base Styles
   ======================================== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  /* Prevent anchor links from hiding behind fixed header */
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* ========================================
   Layout Container
   ======================================== */
.container {
  width: 100%;
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

/* Reusable Page Containers */
.page-content {
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  width: 100%;
}

.page-hero {
  max-width: 80rem;
  margin: var(--spacing-lg) auto;
  padding: var(--spacing-xl) var(--spacing-md);
  text-align: center;
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
  width: 100%;
}

.page-main {
  display: block;
  padding: 7rem var(--spacing-sm) 3rem;
  max-width: 80rem;
  margin: 0 auto;
  width: 100%;
}

@media (min-width: 640px) {
  .page-main {
    padding: 8rem var(--spacing-md) 4rem;
  }
}

@media (min-width: 1024px) {
  .page-main {
    padding: 9rem var(--spacing-lg) 5rem;
  }
}

/* ========================================
   Header Styles
   ======================================== */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(26, 32, 44, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-sm) 0;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--color-text);
}

.logo-icon {
  width: 1.5rem;
  height: 1.5rem;
  color: var(--color-coral);
}

.logo-text {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--color-text);
}

.menu-button {
  display: none;
  background: none;
  border: none;
  padding: var(--spacing-xs);
  border-radius: 50%;
  cursor: pointer;
  color: var(--color-text);
  transition: background-color 0.2s;
}

.menu-button:hover {
  background-color: var(--color-subtle);
}

.menu-button:focus-visible {
  outline: 2px solid var(--color-mint);
  outline-offset: 2px;
}

@media (max-width: 640px) {
  .menu-button {
    display: block;
  }
}

/* Desktop Navigation */
.nav {
  display: none;
  align-items: center;
  gap: 1.5rem;
}

@media (min-width: 641px) {
  .nav {
    display: flex;
  }
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  transition: color 0.2s;
  position: relative;
}

.nav-link:hover {
  color: var(--color-coral);
}

.nav-link.active {
  font-weight: 700;
  color: var(--color-coral);
}

.nav-link:focus-visible {
  outline: 2px solid var(--color-mint);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ========================================
   Main Content
   ======================================== */
main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 7rem var(--spacing-sm) 4rem;
}

@media (min-width: 640px) {
  main {
    padding: 8rem var(--spacing-sm) 6rem;
  }
}

.hero-section {
  max-width: 80rem;
  width: 100%;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2.5rem;
}

@media (min-width: 640px) {
  .hero-section {
    gap: 4rem;
  }
}

/* ========================================
   Typography
   ======================================== */
.hero-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-width: 42rem;
}

h1 {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.033em;
  color: var(--color-text-emphasis);
}

@media (min-width: 640px) {
  h1 {
    font-size: 2.5rem;
  }
}

.hero-description {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-text-muted);
}

@media (min-width: 640px) {
  .hero-description {
    font-size: 1.25rem;
  }
}

/* ========================================
   Buttons
   ======================================== */
.buttons-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  width: 100%;
  max-width: 32rem;
}

/* Base Button Styles */
.btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  border-radius: var(--radius-md);
  color: white;
  width: 100%;
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.015em;
  text-decoration: none;
  border: none;
  cursor: pointer;
  min-height: 150px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

@media (min-width: 640px) {
  .btn {
    font-size: 1.25rem;
  }
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
}

.btn:focus-visible {
  outline: 3px solid var(--color-text-emphasis);
  outline-offset: 3px;
}

.btn:active {
  transform: translateY(0);
}

/* Button Variants */
.btn-immerse {
  background: linear-gradient(135deg, var(--color-mint) 0%, var(--color-soft-blue) 100%);
}

.btn-immerse:hover {
  box-shadow: 0 15px 35px rgba(125, 211, 192, 0.4);
}

.btn-play {
  background: linear-gradient(135deg, var(--color-coral) 0%, var(--color-soft-blue) 100%);
}

.btn-play:hover {
  box-shadow: 0 15px 35px rgba(255, 180, 162, 0.4);
}

.btn-reflect {
  background: linear-gradient(135deg, var(--color-subtle) 0%, var(--color-mint) 100%);
}

.btn-reflect:hover {
  box-shadow: 0 15px 35px rgba(74, 155, 155, 0.4);
}

/* Button Icon */
.btn-icon {
  width: 3rem;
  height: 3rem;
  margin-bottom: 0.5rem;
}

.btn-title {
  display: block;
  margin-bottom: 0.5rem;
}

.btn-description {
  font-size: 0.875rem;
  font-weight: 400;
  opacity: 0.9;
}

/* ========================================
   Footer
   ======================================== */
footer {
  border-top: 1px solid var(--color-border);
  margin-top: 4rem;
}

.footer-content {
  max-width: 80rem;
  margin: 0 auto;
  padding: 3rem var(--spacing-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
}

@media (min-width: 640px) {
  .footer-content {
    padding: 3rem 1.5rem;
  }
}

@media (min-width: 1024px) {
  .footer-content {
    padding: 3rem 2rem;
  }
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--color-text);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem 1.5rem;
}

.footer-link {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-link:hover {
  color: var(--color-coral);
}

.footer-link:focus-visible {
  outline: 2px solid var(--color-mint);
  outline-offset: 2px;
  border-radius: 2px;
}

.footer-copyright {
  margin-top: var(--spacing-sm);
  text-align: center;
  font-size: 0.75rem;
  color: rgba(146, 183, 201, 0.6);
}

/* ========================================
   Accessibility
   ======================================== */

/* Motion Sensitivity */
@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Focus Visible Support */
:focus-visible {
  outline: 2px solid var(--color-mint);
  outline-offset: 2px;
}

/* ========================================
   Mobile Navigation (Common Styles)
   ======================================== */
.mobile-nav {
  position: fixed;
  top: 0;
  left: -100%;
  width: 80%;
  max-width: 20rem;
  height: 100vh;
  background-color: var(--color-card-bg);
  transition: left 0.3s ease;
  z-index: 1001;
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  box-shadow: 2px 0 10px rgba(0, 0, 0, 0.3);
}

.mobile-nav.active {
  left: 0;
}

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav-close {
  background: none;
  border: none;
  color: var(--color-text);
  cursor: pointer;
  padding: var(--spacing-xs);
  border-radius: 50%;
  transition: background-color 0.2s;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mobile-nav-close:hover {
  background-color: var(--color-subtle);
}

.mobile-nav-close:focus-visible {
  outline: 2px solid var(--color-mint);
  outline-offset: 2px;
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.mobile-nav-link {
  color: var(--color-text);
  text-decoration: none;
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all 0.2s;
  font-weight: 500;
  min-height: 44px;
  display: flex;
  align-items: center;
}

.mobile-nav-link:hover {
  background-color: var(--color-subtle);
  color: var(--color-coral);
}

.mobile-nav-link:focus-visible {
  outline: 2px solid var(--color-mint);
  outline-offset: 2px;
}

.mobile-nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  display: none;
}

.mobile-nav-overlay.active {
  display: block;
}