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

:root {
    /* Typography */
    --font-primary: 'Inter', sans-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 */
    
    /* Spacing */
    --spacing-1: 0.25rem;  /* 4px */
    --spacing-2: 0.5rem;   /* 8px */
    --spacing-3: 0.75rem;  /* 12px */
    --spacing-4: 1rem;     /* 16px */
    --spacing-5: 1.25rem;  /* 20px */
    --spacing-6: 1.5rem;   /* 24px */
    --spacing-8: 2rem;     /* 32px */
    --spacing-10: 2.5rem;  /* 40px */
    --spacing-12: 3rem;    /* 48px */
    --spacing-16: 4rem;    /* 64px */
    --spacing-20: 5rem;    /* 80px */
    --spacing-24: 6rem;    /* 96px */
    
    /* Border radius */
    --radius-sm: 0.125rem; /* 2px */
    --radius: 0.25rem;     /* 4px */
    --radius-md: 0.375rem; /* 6px */
    --radius-lg: 0.5rem;   /* 8px */
    --radius-xl: 0.75rem;  /* 12px */
    --radius-2xl: 1rem;    /* 16px */
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 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);
    
    /* Transitions */
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

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

body {
  font-family: 'Inter', sans-serif;
  background: #f8fafc;
  color: #1e293b;
  margin: 0;
  padding: 0;
  line-height: 1.7;
}

/* Container utility */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2vw;
}

@media (min-width: 640px) {
    .container {
        padding: 0 var(--spacing-6);
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--spacing-8);
    }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-4);
}

h1 {
    font-size: var(--font-size-4xl);
}

h2 {
    font-size: var(--font-size-3xl);
}

h3 {
    font-size: var(--font-size-2xl);
}

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

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 2rem;
  color: #10b981;
  letter-spacing: 1px;
  text-align: center;
  position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background-color: currentColor;
    margin: var(--spacing-4) auto 0;
    border-radius: var(--radius);
}

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

a:hover, a:focus {
    outline: none;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-3) var(--spacing-6);
    border-radius: var(--radius);
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.btn-primary {
    background-color: #064e3b;
    color: white;
}

.btn-primary:hover, .btn-primary:focus {
    background-color: #043828;
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    border-color: currentColor;
    color: inherit;
}

.btn-outline:hover, .btn-outline:focus {
    background-color: currentColor;
    color: white;
}

.filter-btn {
  background: #f3f4f6;
  color: #1e293b;
  border: none;
  border-radius: 2rem;
  padding: 0.5rem 1.5rem;
  font-weight: 700;
  margin: 0 0.5rem;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.filter-btn:hover {
  background: #10b981;
  color: #fff;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: var(--spacing-4) 0;
    transition: var(--transition);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.header.scrolled {
    padding: var(--spacing-2) 0;
    box-shadow: var(--shadow-md);
}

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

.logo {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: #064e3b;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-6);
}

.nav-menu a {
    position: relative;
    font-weight: 500;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: currentColor;
    transition: var(--transition);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-2);
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: #333;
    margin: 2px 0;
    transition: var(--transition);
}

/* Footer */
.footer {
    background-color: #1a1a1a;
    color: white;
    padding: var(--spacing-16) 0 var(--spacing-8);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-10);
    margin-bottom: var(--spacing-10);
}

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

@media (min-width: 1024px) {
    .footer-content {
        grid-template-columns: repeat(3, 1fr);
    }
}

.footer-brand h3 {
    font-size: var(--font-size-2xl);
    color: #10b981;
}

.footer-links h4,
.footer-social h4 {
    margin-bottom: var(--spacing-4);
    color: #10b981;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-2);
}

.footer-links a:hover {
    color: #10b981;
}

.social-icons {
    display: flex;
    gap: var(--spacing-4);
}

.social-icons a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: #333;
    border-radius: 50%;
    transition: var(--transition);
}

.social-icons a:hover {
    background-color: #10b981;
    transform: translateY(-3px);
}

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: var(--spacing-6);
    text-align: center;
}

/* Page Hero */
.page-hero {
    padding: var(--spacing-20) 0 var(--spacing-12);
    text-align: center;
    background-color: #f8fafc;
    margin-top: 76px; /* Account for fixed header */
}

.page-hero h1 {
    font-size: var(--font-size-5xl);
    margin-bottom: var(--spacing-4);
}

/* Accessibility */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus styles */
button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid #064e3b;
    outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    .btn,
    .nav-menu a,
    .social-icons a {
        transition: none;
    }
    
    .btn:hover,
    .btn:focus,
    .social-icons a:hover,
    .social-icons a:focus {
        transform: none;
    }
}

/* Responsive navigation */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        flex-direction: column;
        background-color: white;
        padding: var(--spacing-6);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        z-index: 999;
        gap: var(--spacing-4);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
}

/* General layout improvements */
img {
  border-radius: 1.2rem;
  box-shadow: 0 2px 12px rgba(16,185,129,0.10);
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
}

img:hover {
  transform: scale(1.04) rotate(-1deg);
  box-shadow: 0 6px 32px rgba(16,185,129,0.18);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 2.5vw;
  background: #fff;
  box-shadow: 0 2px 12px rgba(16,185,129,0.08);
  border-radius: 0 0 1.5rem 1.5rem;
}

.navbar a {
  color: #1e293b;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.1rem;
  transition: color 0.2s;
}

.navbar a:hover {
  color: #10b981;
}

#darkModeToggle {
  margin-left: 2vw;
  background: #f3f4f6;
  border: none;
  padding: 0.7rem 1.2rem;
  border-radius: 2rem;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(16,185,129,0.10);
  transition: background 0.3s;
}

#darkModeToggle:hover {
  background: #10b981;
  color: #fff;
}

/* Dark mode styles */
body.dark-mode {
  background: #18181b !important;
  color: #f3f4f6 !important;
}

body.dark-mode .header, body.dark-mode nav, body.dark-mode .navbar {
  background: #23272f !important;
  color: #f3f4f6 !important;
  box-shadow: 0 2px 12px rgba(16,185,129,0.18) !important;
}

body.dark-mode .section-title, body.dark-mode h2, body.dark-mode h1, body.dark-mode h3, body.dark-mode h4 {
  color: #10b981 !important;
}

body.dark-mode .gallery-masonry, body.dark-mode .timeline, body.dark-mode .container {
  background: #23272f !important;
  color: #f3f4f6 !important;
}

body.dark-mode .masonry-item {
  box-shadow: 0 2px 12px rgba(16,185,129,0.22) !important;
}

body.dark-mode #chat-widget {
  background: #23272f !important;
  color: #f3f4f6 !important;
}

body.dark-mode .filter-btn {
  background: #18181b !important;
  color: #10b981 !important;
}

body.dark-mode #darkModeToggle {
  background: #18181b !important;
  color: #f3f4f6 !important;
}

/* Utility classes */
.text-center {
    text-align: center;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}