/* ============================================
   SAJAL ARYAN — DESIGN SYSTEM
   Dark cinematic aesthetic for wildlife photography
   ============================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,500;0,600;0,700;0,800;1,400;1,500&family=Inter:wght@300;400;500;600;700&display=swap');

/* ============================================
   CSS CUSTOM PROPERTIES
   ============================================ */
:root {
  /* --- Color Palette --- */
  --color-bg:             #0a0a0a;
  --color-bg-alt:         #0e0e0e;
  --color-surface:        #141414;
  --color-surface-hover:  #1a1a1a;
  --color-surface-elevated: #1e1e1e;
  --color-border:         #2a2a2a;
  --color-border-light:   #333333;

  --color-text-primary:   #f5f5f5;
  --color-text-secondary: #a0a0a0;
  --color-text-muted:     #666666;
  --color-text-inverse:   #0a0a0a;

  /* Accent: Warm Amber (Golden Hour) */
  --color-accent:         #d4a574;
  --color-accent-hover:   #e8b88a;
  --color-accent-dark:    #b8895c;
  --color-accent-light:   #f0d4b8;
  --color-accent-glow:    rgba(212, 165, 116, 0.15);
  --color-accent-glow-strong: rgba(212, 165, 116, 0.3);

  /* Nature Greens */
  --color-green:          #4a7c59;
  --color-green-dark:     #2d5a27;
  --color-green-light:    #6b9e7a;

  /* Status Colors */
  --color-success:        #4caf50;
  --color-warning:        #ff9800;
  --color-error:          #ef5350;
  --color-info:           #42a5f5;

  /* --- Typography --- */
  --font-heading:         'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-body:            'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:            'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  /* Font Sizes (fluid) */
  --text-xs:    clamp(0.7rem, 0.65rem + 0.25vw, 0.75rem);
  --text-sm:    clamp(0.8rem, 0.75rem + 0.25vw, 0.875rem);
  --text-base:  clamp(0.9rem, 0.85rem + 0.25vw, 1rem);
  --text-lg:    clamp(1rem, 0.95rem + 0.3vw, 1.125rem);
  --text-xl:    clamp(1.15rem, 1rem + 0.5vw, 1.25rem);
  --text-2xl:   clamp(1.4rem, 1.2rem + 0.8vw, 1.5rem);
  --text-3xl:   clamp(1.7rem, 1.4rem + 1.2vw, 1.875rem);
  --text-4xl:   clamp(2rem, 1.5rem + 2vw, 2.5rem);
  --text-5xl:   clamp(2.5rem, 1.8rem + 3vw, 3.5rem);
  --text-6xl:   clamp(3rem, 2rem + 4vw, 4.5rem);
  --text-hero:  clamp(3.5rem, 2rem + 6vw, 7rem);

  /* Line Heights */
  --leading-tight:    1.15;
  --leading-snug:     1.3;
  --leading-normal:   1.6;
  --leading-relaxed:  1.75;

  /* Letter Spacing */
  --tracking-tight:   -0.02em;
  --tracking-normal:  0;
  --tracking-wide:    0.05em;
  --tracking-wider:   0.1em;
  --tracking-widest:  0.2em;

  /* --- Spacing Scale (4px base) --- */
  --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 */
  --space-24:  6rem;      /* 96px */
  --space-32:  8rem;      /* 128px */

  /* --- Layout --- */
  --max-width:        1440px;
  --max-width-narrow: 900px;
  --max-width-wide:   1600px;
  --sidebar-width:    280px;
  --header-height:    80px;
  --header-height-scrolled: 64px;

  /* --- Border Radius --- */
  --radius-sm:    4px;
  --radius-md:    8px;
  --radius-lg:    12px;
  --radius-xl:    16px;
  --radius-2xl:   24px;
  --radius-full:  9999px;

  /* --- Shadows --- */
  --shadow-sm:    0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md:    0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg:    0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-xl:    0 16px 48px rgba(0, 0, 0, 0.6);
  --shadow-glow:  0 0 30px var(--color-accent-glow);
  --shadow-glow-strong: 0 0 60px var(--color-accent-glow-strong);

  /* --- Glassmorphism --- */
  --glass-bg:     rgba(20, 20, 20, 0.7);
  --glass-bg-light: rgba(30, 30, 30, 0.6);
  --glass-blur:   16px;
  --glass-border: rgba(255, 255, 255, 0.06);

  /* --- Transitions --- */
  --ease-out:     cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out:  cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring:  cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast:    150ms;
  --duration-normal:  300ms;
  --duration-slow:    500ms;
  --duration-slower:  800ms;

  /* --- Z-Index Scale --- */
  --z-base:       1;
  --z-dropdown:   100;
  --z-sticky:     200;
  --z-overlay:    300;
  --z-modal:      400;
  --z-toast:      500;
  --z-tooltip:    600;
}

/* ============================================
   CSS RESET & BASE
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  overflow-x: hidden;
  min-height: 100vh;
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--color-bg);
}
::-webkit-scrollbar-thumb {
  background: var(--color-border-light);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent-dark);
}

/* Selection */
::selection {
  background: var(--color-accent);
  color: var(--color-text-inverse);
}

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

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text-primary);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p {
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
  max-width: 70ch;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}
a:hover {
  color: var(--color-accent-hover);
}

strong { font-weight: 600; color: var(--color-text-primary); }
em { font-style: italic; }
small { font-size: var(--text-sm); }

.text-accent { color: var(--color-accent); }
.text-muted { color: var(--color-text-muted); }
.text-center { text-align: center; }
.text-right { text-align: right; }

.heading-display {
  font-family: var(--font-heading);
  font-size: var(--text-hero);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
}

.heading-section {
  font-size: var(--text-4xl);
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.heading-subsection {
  font-size: var(--text-2xl);
  font-weight: 500;
  margin-bottom: var(--space-3);
}

.label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-widest);
  color: var(--color-accent);
}

.subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  max-width: 60ch;
}

/* ============================================
   LAYOUT UTILITIES
   ============================================ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container-narrow {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container-wide {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--space-24) 0;
}

.section-sm {
  padding: var(--space-16) 0;
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }
.gap-10 { gap: var(--space-10); }

.grid { display: grid; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.w-full { width: 100%; }
.h-full { height: 100%; }
.mx-auto { margin-left: auto; margin-right: auto; }
.relative { position: relative; }
.absolute { position: absolute; }
.overflow-hidden { overflow: hidden; }

/* ============================================
   ANIMATIONS
   ============================================ */

/* Fade In Up — used for scroll reveals */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-60px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(60px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes glow {
  0%, 100% { box-shadow: 0 0 20px var(--color-accent-glow); }
  50% { box-shadow: 0 0 40px var(--color-accent-glow-strong); }
}

@keyframes confetti-fall {
  0% { transform: translateY(-100vh) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}

@keyframes typewriter {
  from { width: 0; }
  to { width: 100%; }
}

@keyframes blink {
  0%, 100% { border-color: transparent; }
  50% { border-color: var(--color-accent); }
}

/* Scroll reveal classes */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity var(--duration-slower) var(--ease-out),
              transform var(--duration-slower) var(--ease-out);
}

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

.reveal-left {
  opacity: 0;
  transform: translateX(-60px);
  transition: opacity var(--duration-slower) var(--ease-out),
              transform var(--duration-slower) var(--ease-out);
}

.reveal-left.revealed {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(60px);
  transition: opacity var(--duration-slower) var(--ease-out),
              transform var(--duration-slower) var(--ease-out);
}

.reveal-right.revealed {
  opacity: 1;
  transform: translateX(0);
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity var(--duration-slower) var(--ease-out),
              transform var(--duration-slower) var(--ease-out);
}

.reveal-scale.revealed {
  opacity: 1;
  transform: scale(1);
}

/* Stagger animation delays */
.delay-1 { transition-delay: 100ms; }
.delay-2 { transition-delay: 200ms; }
.delay-3 { transition-delay: 300ms; }
.delay-4 { transition-delay: 400ms; }
.delay-5 { transition-delay: 500ms; }
.delay-6 { transition-delay: 600ms; }

/* Hover animation utilities */
.hover-lift {
  transition: transform var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
}
.hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.hover-glow {
  transition: box-shadow var(--duration-normal) var(--ease-out);
}
.hover-glow:hover {
  box-shadow: var(--shadow-glow);
}

.hover-scale {
  transition: transform var(--duration-normal) var(--ease-out);
}
.hover-scale:hover {
  transform: scale(1.02);
}

/* Loading skeleton */
.skeleton {
  background: linear-gradient(90deg, var(--color-surface) 25%, var(--color-surface-elevated) 50%, var(--color-surface) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

/* Spinner */
.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.img-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-contain {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* ============================================
   RESPONSIVE BREAKPOINTS
   ============================================ */
@media (max-width: 1200px) {
  .grid-4 { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 992px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .container, .container-narrow, .container-wide {
    padding: 0 var(--space-4);
  }

  .section {
    padding: var(--space-16) 0;
  }

  .section-sm {
    padding: var(--space-10) 0;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .hide-mobile { display: none !important; }
}

@media (max-width: 480px) {
  .container, .container-narrow, .container-wide {
    padding: 0 var(--space-3);
  }
}

@media (min-width: 769px) {
  .hide-desktop { display: none !important; }
}

/* ============================================
   VISUALLY HIDDEN (Accessibility)
   ============================================ */
.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;
}