/* ===== CSS Reset ===== */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -moz-text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  font-family: 'Manrope', 'Inter', system-ui, -apple-system, sans-serif;
  color: var(--color-text-body);
  line-height: 1.7;
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

ul,
ol {
  list-style: none;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

p,
h1,
h2,
h3,
h4,
h5,
h6 {
  overflow-wrap: break-word;
}

/* ===== CSS Variables ===== */

:root {
  --color-primary: #DC2626;
  --color-primary-hover: #B91C1C;
  --color-primary-light: #FEF2F2;
  --color-primary-glow: rgba(220, 38, 38, 0.15);

  --color-bg: #FAFAFA;
  --color-bg-white: #FFFFFF;
  --color-bg-dark: #0A0A0A;
  --color-bg-dark-card: #111111;
  --color-bg-dark-lighter: #1A1A1A;

  --color-text-primary: #0F172A;
  --color-text-body: #475569;
  --color-text-muted: #94A3B8;
  --color-text-white: #FFFFFF;
  --color-text-white-muted: rgba(255, 255, 255, 0.7);

  --color-border: #E2E8F0;
  --color-border-light: #F1F5F9;

  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-card-hover: 0 20px 40px rgba(0, 0, 0, 0.08), 0 8px 16px rgba(0, 0, 0, 0.06);
  --shadow-button: 0 4px 14px rgba(220, 38, 38, 0.25);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 24px;

  --transition-fast: 0.2s ease;
  --transition-base: 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
  --transition-slow: 0.5s ease;
}

/* ===== Typography ===== */

h1 {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

h2 {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
}

h3 {
  font-size: 24px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text-primary);
}

h4 {
  font-size: 20px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-text-primary);
}

.text-lg {
  font-size: 18px;
  line-height: 1.7;
}

.text-sm {
  font-size: 14px;
}

.text-xs {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}

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

a:hover {
  color: var(--color-primary);
}

/* ===== Layout / Grid ===== */

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

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

/* ===== Sections ===== */

.section {
  padding: 96px 0;
}

.section-dark {
  background: var(--color-bg-dark);
  color: var(--color-text-white);
}

.section-gray {
  background: #F8FAFC;
}

.section-header {
  margin-bottom: 48px;
}

.section-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-text-primary);
}

.section-dark .section-title {
  color: var(--color-text-white);
}

.section-subtitle {
  font-size: 18px;
  color: var(--color-text-body);
  margin-top: 12px;
  max-width: 600px;
}

/* ===== Utility Classes ===== */

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

.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mt-5 { margin-top: 40px; }
.mt-6 { margin-top: 48px; }
.mt-7 { margin-top: 56px; }
.mt-8 { margin-top: 64px; }

.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.mb-5 { margin-bottom: 40px; }
.mb-6 { margin-bottom: 48px; }
.mb-7 { margin-bottom: 56px; }
.mb-8 { margin-bottom: 64px; }

.mx-auto {
  margin-left: auto;
  margin-right: auto;
}

.hidden {
  display: none;
}

.block {
  display: block;
}

.relative {
  position: relative;
}

.absolute {
  position: absolute;
}

.fixed {
  position: fixed;
}

.overflow-hidden {
  overflow: hidden;
}

.w-full {
  width: 100%;
}

/* ===== Selection ===== */

::selection {
  background: var(--color-primary);
  color: var(--color-text-white);
}

/* ===== Focus ===== */

*:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ===== Scrollbar ===== */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: #1a1a1a;
}

::-webkit-scrollbar-thumb {
  background: #444;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #666;
}

html {
  scrollbar-width: thin;
  scrollbar-color: #444 #1a1a1a;
}

/* ===== Responsive: Tablet (max-width: 1024px) ===== */

@media (max-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

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

/* ===== Responsive: Mobile (max-width: 640px) ===== */

@media (max-width: 640px) {
  .container {
    padding: 0 16px;
  }

  .section {
    padding: 64px 0;
  }

  h1 {
    font-size: 32px;
  }

  h2 {
    font-size: 28px;
  }

  h3 {
    font-size: 20px;
  }

  .section-title {
    font-size: 28px;
  }

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

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

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

/* ===== Responsive: Wide (min-width: 1400px) ===== */

@media (min-width: 1400px) {
  .container {
    padding: 0 40px;
  }
}

/* ===== AOS fix for mobile (disabled at ≤640px) ===== */

@media (max-width: 640px) {
  [data-aos] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}