/* ==========================================================================
   base.css — Variables, Reset, Typography, Container, Utilities
   ========================================================================== */

/* --- Custom Properties --- */

:root {
  --brand-blue: #5BB5E8;
  --brand-dark: #2B3A4E;
  --accent: #D4760A;
  --accent-hover: #B5620A;
  --dark-bg: #1A2530;
  --light-bg: #F4F7FA;
  --steel: #8CA0B3;
  --white: #FFFFFF;
  --text: #2C3E50;
  --success: #27AE60;
  --error: #E74C3C;
  --border: #DEE2E6;

  --font-heading: 'Oswald', sans-serif;
  --font-body: 'Source Sans 3', 'Source Sans Pro', sans-serif;

  --container-max: 1280px;
  --container-pad: clamp(16px, 4vw, 40px);

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);

  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.6s ease-out;

  --header-h: 80px;

  --vh: 1vh;
}

/* --- Reset --- */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

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

body {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul,
ol {
  list-style: none;
}

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

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

/* --- Typography --- */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--brand-dark);
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h3 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
}

h4 {
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
}

p {
  margin-bottom: 1em;
}

p:last-child {
  margin-bottom: 0;
}

strong {
  font-weight: 600;
}

/* --- Container --- */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.container--narrow {
  max-width: 960px;
}

.container--wide {
  max-width: 1440px;
}

/* --- 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: 0;
}

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

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

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

.text-accent {
  color: var(--accent);
}

.text-brand {
  color: var(--brand-blue);
}

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

.text-steel {
  color: var(--steel);
}

.fw-600 {
  font-weight: 600;
}

.fw-700 {
  font-weight: 700;
}

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mt-5 { margin-top: 48px; }
.mt-6 { margin-top: 64px; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.mb-5 { margin-bottom: 48px; }
.mb-6 { margin-bottom: 64px; }

.pt-0 { padding-top: 0; }
.pt-1 { padding-top: 8px; }
.pt-2 { padding-top: 16px; }
.pt-3 { padding-top: 24px; }
.pt-4 { padding-top: 32px; }

.pb-0 { padding-bottom: 0; }
.pb-1 { padding-bottom: 8px; }
.pb-2 { padding-bottom: 16px; }
.pb-3 { padding-bottom: 24px; }
.pb-4 { padding-bottom: 32px; }

.flex {
  display: flex;
}

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

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

.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }
.gap-4 { gap: 32px; }