/* ========================================
   MODERN DESIGN SYSTEM
   OKLCH colors defined in theme-tokens.css
   ======================================== */

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

/* Scale: 1.25 ratio (14px, 18px, 22px, 28px, 35px, 44px, 55px, 69px) */
:root {
  --font-display: "Cabinet Grotesk", "Satoshi", system-ui, sans-serif;
  --font-subheading: "General Sans", "Plus Jakarta Sans", system-ui, sans-serif;
  --font-body: "Geist", "DM Sans", system-ui, sans-serif;
  --font-mono: "GeistMono", "Berkeley Mono", "JetBrains Mono", monospace;
  --font-feature: "Fraunces", Georgia, serif;

  --text-xs: clamp(0.875rem, 0.8vw + 0.7rem, 1rem);      /* 14px */
  --text-sm: clamp(1.125rem, 0.9vw + 0.9rem, 1.25rem);   /* 18px */
  --text-base: clamp(1.375rem, 1vw + 1.1rem, 1.5rem);    /* 22px */
  --text-lg: clamp(1.75rem, 1.2vw + 1.3rem, 2rem);       /* 28px */
  --text-xl: clamp(2.188rem, 1.4vw + 1.6rem, 2.5rem);    /* 35px */
  --text-2xl: clamp(2.75rem, 1.6vw + 2rem, 3.25rem);     /* 44px */
  --text-3xl: clamp(3.438rem, 1.8vw + 2.5rem, 4rem);     /* 55px */
  --text-4xl: clamp(4.313rem, 2vw + 3rem, 5rem);         /* 69px */

  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.7;
}

/* Apply typography */
.text-display {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.text-subheading {
  font-family: var(--font-subheading);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.text-body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: var(--line-height-relaxed);
}

.text-feature {
  font-family: var(--font-feature);
  font-weight: 600;
  font-variation-settings: "wght" 650;
}

/* ========================================
   SPACING SYSTEM
   ======================================== */

:root {
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-24: 6rem;     /* 96px */
  --space-32: 8rem;     /* 128px */

  --section-padding-mobile: var(--space-12);   /* 48px */
  --section-padding-desktop: var(--space-24);  /* 96px */
  --content-max-width: 75rem;   /* 1200px */
  --reading-width: 45rem;       /* 720px */
}

/* ========================================
   HERO SECTION WITH GRADIENT MESH
   ======================================== */

.hero-gradient-mesh {
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.hero-gradient-mesh::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse at 20% 30%, var(--clr-gradient-1) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 60%, var(--clr-gradient-2) 0%, transparent 50%),
    radial-gradient(ellipse at 40% 80%, var(--clr-gradient-3) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 20%, var(--clr-gradient-4) 0%, transparent 50%);
  filter: blur(80px);
  opacity: 0.3;
  animation: gradient-shift 15s ease-in-out infinite;
}

/* Light mode specific background */
:root .hero-gradient-mesh::before {
  background-color: var(--clr-light-bg-base);
}

/* Dark mode specific background */
.dark .hero-gradient-mesh::before {
  background-color: var(--clr-dark-bg-base);
}

@keyframes gradient-shift {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(5%, -5%) scale(1.05); }
  66% { transform: translate(-5%, 5%) scale(0.95); }
}

/* Floating geometric shapes */
.floating-shapes {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
}

.floating-shape {
  position: absolute;
  border-radius: 50%;
  backdrop-filter: blur(40px);
  animation: float 20s ease-in-out infinite;
}

.floating-shape:nth-child(1) {
  width: 300px;
  height: 300px;
  top: 10%;
  left: 10%;
  background: radial-gradient(circle, var(--clr-gradient-1) 0%, transparent 70%);
  animation-delay: 0s;
}

.floating-shape:nth-child(2) {
  width: 200px;
  height: 200px;
  top: 60%;
  right: 15%;
  background: radial-gradient(circle, var(--clr-gradient-2) 0%, transparent 70%);
  animation-delay: -7s;
}

.floating-shape:nth-child(3) {
  width: 250px;
  height: 250px;
  bottom: 15%;
  left: 20%;
  background: radial-gradient(circle, var(--clr-gradient-3) 0%, transparent 70%);
  animation-delay: -14s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  33% { transform: translate(30px, -30px) rotate(120deg); }
  66% { transform: translate(-20px, 20px) rotate(240deg); }
}

/* ========================================
   FROSTED GLASS NAVIGATION
   ======================================== */

.nav-frosted {
  background: color-mix(in oklch, var(--clr-light-bg-base) 70%, transparent);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border-bottom: 1px solid color-mix(in oklch, var(--clr-light-primary) 20%, transparent);
  box-shadow: 0 4px 24px color-mix(in oklch, var(--clr-light-text-primary) 8%, transparent);
}

.dark .nav-frosted {
  background: color-mix(in oklch, var(--clr-dark-bg-base) 70%, transparent);
  border-bottom: 1px solid color-mix(in oklch, var(--clr-dark-primary) 20%, transparent);
  box-shadow: 0 4px 24px color-mix(in oklch, var(--clr-dark-text-primary) 12%, transparent);
}

/* Active indicator with smooth slide */
.nav-link {
  position: relative;
  transition: color 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--clr-light-primary);
  transition: width 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

.dark .nav-link::after {
  background: var(--clr-dark-primary);
}

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

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

.dark .nav-link.active {
  color: var(--clr-dark-primary);
}

/* ========================================
   MODERN CARD COMPONENTS
   ======================================== */

.modern-card {
  background: var(--clr-light-bg-elevated);
  border-radius: 16px;
  border: 1px solid color-mix(in oklch, var(--clr-light-text-primary) 8%, transparent);
  box-shadow:
    0 4px 24px color-mix(in oklch, var(--clr-light-text-primary) 8%, transparent),
    0 0 0 1px color-mix(in oklch, var(--clr-light-primary) 5%, transparent) inset;
  transition: all 200ms cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.dark .modern-card {
  background: var(--clr-dark-bg-elevated);
  border: 1px solid color-mix(in oklch, var(--clr-dark-text-primary) 12%, transparent);
  box-shadow:
    0 4px 24px color-mix(in oklch, var(--clr-dark-bg-base) 12%, transparent),
    0 0 0 1px color-mix(in oklch, var(--clr-dark-primary) 5%, transparent) inset;
}

/* Gradient border on top */
.modern-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--clr-light-primary) 50%,
    transparent 100%
  );
  opacity: 0.5;
}

.dark .modern-card::before {
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--clr-dark-primary) 50%,
    transparent 100%
  );
}

/* Hover effect: lift + glow */
.modern-card:hover {
  transform: translateY(-4px);
  box-shadow:
    0 12px 48px color-mix(in oklch, var(--clr-light-primary) 15%, transparent),
    0 0 0 1px color-mix(in oklch, var(--clr-light-primary) 10%, transparent) inset;
}

.dark .modern-card:hover {
  box-shadow:
    0 12px 48px color-mix(in oklch, var(--clr-dark-primary) 25%, transparent),
    0 0 0 1px color-mix(in oklch, var(--clr-dark-primary) 15%, transparent) inset;
}

/* ========================================
   MODERN BUTTON COMPONENTS
   ======================================== */

.btn-modern {
  position: relative;
  padding: var(--space-4) var(--space-8);
  border-radius: 12px;
  font-weight: 600;
  letter-spacing: 0.025em;
  font-size: var(--text-sm);
  transition: all 200ms cubic-bezier(0.4, 0, 0.2, 1);
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  isolation: isolate;
}

/* Primary button - gradient background */
.btn-modern-primary {
  background: linear-gradient(
    135deg,
    var(--clr-light-primary) 0%,
    color-mix(in oklch, var(--clr-light-primary) 80%, var(--clr-light-secondary) 20%) 100%
  );
  color: var(--clr-light-btn-on-primary);
  box-shadow: 0 4px 12px color-mix(in oklch, var(--clr-light-primary) 25%, transparent);
}

.dark .btn-modern-primary {
  background: linear-gradient(
    135deg,
    var(--clr-dark-primary) 0%,
    color-mix(in oklch, var(--clr-dark-primary) 80%, var(--clr-dark-secondary) 20%) 100%
  );
  color: var(--clr-dark-btn-on-primary);
  box-shadow: 0 4px 12px color-mix(in oklch, var(--clr-dark-primary) 30%, transparent);
}

.btn-modern-primary:hover {
  transform: scale(1.02);
  filter: brightness(1.1);
  box-shadow: 0 8px 24px color-mix(in oklch, var(--clr-light-primary) 35%, transparent);
}

.dark .btn-modern-primary:hover {
  box-shadow: 0 8px 24px color-mix(in oklch, var(--clr-dark-primary) 40%, transparent);
}

.btn-modern-primary:active {
  transform: scale(0.98);
}

/* Secondary button - outline with hover fill */
.btn-modern-secondary {
  background: transparent;
  color: var(--clr-light-primary);
  border: 2px solid var(--clr-light-primary);
  box-shadow: none;
}

.dark .btn-modern-secondary {
  color: var(--clr-dark-primary);
  border-color: var(--clr-dark-primary);
}

.btn-modern-secondary:hover {
  background: var(--clr-light-primary);
  color: var(--clr-light-btn-on-primary);
  transform: scale(1.02);
}

.dark .btn-modern-secondary:hover {
  background: var(--clr-dark-primary);
  color: var(--clr-dark-btn-on-primary);
}

/* Icon animations */
.btn-modern svg {
  transition: transform 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-modern:hover svg {
  transform: translateX(4px);
}

/* ========================================
   POST CARD COMPONENTS
   ======================================== */

.post-card {
  background: var(--clr-light-bg-elevated);
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid color-mix(in oklch, var(--clr-light-text-primary) 8%, transparent);
  transition: all 200ms cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 24px color-mix(in oklch, var(--clr-light-text-primary) 8%, transparent);
}

.dark .post-card {
  background: var(--clr-dark-bg-surface);
  border-color: color-mix(in oklch, var(--clr-dark-text-primary) 12%, transparent);
  box-shadow: 0 4px 24px color-mix(in oklch, var(--clr-dark-bg-base) 12%, transparent);
}

.post-card-image {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--clr-light-bg-surface);
}

.dark .post-card-image {
  background: var(--clr-dark-bg-elevated);
}

.post-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

.post-card:hover .post-card-image img {
  transform: scale(1.05);
}

/* Tag pills */
.tag-pill {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  border-radius: 12px;
  font-size: var(--text-xs);
  font-weight: 500;
  background: color-mix(in oklch, var(--clr-light-primary) 15%, transparent);
  color: var(--clr-light-primary);
}

.dark .tag-pill {
  background: color-mix(in oklch, var(--clr-dark-primary) 20%, transparent);
  color: var(--clr-dark-primary);
}

/* Date with monospace font */
.post-date {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--clr-light-text-tertiary);
}

.dark .post-date {
  color: var(--clr-dark-text-tertiary);
}

/* Hover: lift + glow */
.post-card:hover {
  transform: translateY(-4px);
  box-shadow:
    0 12px 48px color-mix(in oklch, var(--clr-light-primary) 15%, transparent),
    0 0 0 1px color-mix(in oklch, var(--clr-light-primary) 10%, transparent) inset;
}

.dark .post-card:hover {
  box-shadow:
    0 12px 48px color-mix(in oklch, var(--clr-dark-primary) 25%, transparent),
    0 0 0 1px color-mix(in oklch, var(--clr-dark-primary) 15%, transparent) inset;
}

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

/* Gradient text for main heading */
.gradient-text-modern {
  background: linear-gradient(
    135deg,
    var(--clr-light-primary) 0%,
    var(--clr-light-secondary) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.dark .gradient-text-modern {
  background: linear-gradient(
    135deg,
    var(--clr-dark-primary) 0%,
    var(--clr-dark-secondary) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Text shadow for depth on dark mode */
.dark .text-shadow-depth {
  text-shadow: 0 2px 8px color-mix(in oklch, var(--clr-dark-bg-base) 40%, transparent);
}

/* Quote blocks */
.quote-block {
  position: relative;
  padding-left: var(--space-8);
  border-left: 4px solid var(--clr-light-primary);
  font-style: italic;
  color: var(--clr-light-text-secondary);
}

.dark .quote-block {
  border-left-color: var(--clr-dark-primary);
  color: var(--clr-dark-text-secondary);
}

.quote-block::before {
  content: '\201C';
  position: absolute;
  left: -0.5rem;
  top: -1rem;
  font-size: 4rem;
  color: color-mix(in oklch, var(--clr-light-primary) 30%, transparent);
  font-family: Georgia, serif;
  line-height: 1;
}

.dark .quote-block::before {
  color: color-mix(in oklch, var(--clr-dark-primary) 40%, transparent);
}

/* ========================================
   FOCUS STATES & ACCESSIBILITY
   ======================================== */

/* Focus rings with 3px solid + 2px offset */
*:focus-visible {
  outline: 3px solid var(--clr-light-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

.dark *:focus-visible {
  outline-color: var(--clr-dark-primary);
}

/* ========================================
   INTERACTIVE STATES
   ======================================== */

/* Transitions */
.transition-colors {
  transition: color 200ms cubic-bezier(0.4, 0, 0.2, 1),
              background-color 200ms cubic-bezier(0.4, 0, 0.2, 1),
              border-color 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

.transition-transform {
  transition: transform 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Active states */
.active-scale:active {
  transform: scale(0.98);
}

/* ========================================
   REDUCED MOTION SUPPORT
   ======================================== */

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

  .hero-gradient-mesh::before,
  .floating-shape {
    animation: none !important;
  }
}

/* ========================================
   SMOOTH SCROLL BEHAVIOR
   ======================================== */

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

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

.stagger-children > * {
  animation: fadeInUp 0.6s ease-out backwards;
}

.stagger-children > *:nth-child(1) { animation-delay: 0ms; }
.stagger-children > *:nth-child(2) { animation-delay: 50ms; }
.stagger-children > *:nth-child(3) { animation-delay: 100ms; }
.stagger-children > *:nth-child(4) { animation-delay: 150ms; }
.stagger-children > *:nth-child(5) { animation-delay: 200ms; }
.stagger-children > *:nth-child(6) { animation-delay: 250ms; }

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

/* ========================================
   SUBTLE NOISE TEXTURE
   ======================================== */

.noise-texture {
  position: relative;
}

.noise-texture::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 1;
}

/* ========================================
   CONTAINER QUERIES FOR ADAPTIVE COMPONENTS
   ======================================== */

@container (min-width: 640px) {
  .modern-card {
    border-radius: 24px;
  }
}

/* ========================================
   DARK MODE TOGGLE SMOOTH TRANSITIONS
   ======================================== */

html {
  transition: background-color 400ms ease,
              color 400ms ease;
}

html * {
  transition: background-color 400ms ease,
              color 400ms ease,
              border-color 400ms ease,
              box-shadow 400ms ease;
}