/* ============================================
   MAIN.CSS — Design Tokens, Reset, Base Styles
   ============================================ */

/* --- Design Tokens --- */
:root {
  /* Colors */
  --primary: #1E40AF;
  --primary-light: #3B82F6;
  --primary-dark: #1E3A8A;
  --primary-50: #EFF6FF;
  --primary-100: #DBEAFE;

  --accent: #F59E0B;
  --accent-hover: #D97706;
  --accent-light: #FEF3C7;

  --bg-primary: #FFFFFF;
  --bg-secondary: #F8FAFC;
  --bg-tertiary: #F1F5F9;

  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;

  --success: #10B981;
  --success-light: #D1FAE5;
  --error: #EF4444;
  --error-light: #FEE2E2;
  --warning: #F59E0B;
  --warning-light: #FEF3C7;

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

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 4px 24px rgba(30,64,175,0.08);
  --shadow-md: 0 8px 32px rgba(30,64,175,0.12);
  --shadow-lg: 0 16px 48px rgba(30,64,175,0.16);

  /* Typography */
  --font-heading: 'Plus Jakarta Sans', sans-serif;
  --font-body: 'Inter', sans-serif;
  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-lg: 1.125rem;
  --fs-xl: 1.25rem;
  --fs-2xl: 1.5rem;
  --fs-3xl: 1.875rem;
  --fs-4xl: 2.25rem;
  --fs-5xl: 3rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 150ms;
  --duration: 250ms;
  --duration-slow: 400ms;

  /* Layout */
  --container-max: 1200px;
  --navbar-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: var(--navbar-height);
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--text-secondary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

h1 { font-size: var(--fs-5xl); font-weight: 800; }
h2 { font-size: var(--fs-4xl); font-weight: 700; }
h3 { font-size: var(--fs-xl); font-weight: 700; }
h4 { font-size: var(--fs-lg); font-weight: 600; }

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

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

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

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

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

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-16);
}

.section-tag {
  display: inline-block;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-50);
  padding: var(--space-1) var(--space-4);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
  letter-spacing: 0.025em;
  text-transform: uppercase;
}

.section-title {
  margin-bottom: var(--space-4);
}

.section-desc {
  font-size: var(--fs-lg);
  color: var(--text-secondary);
  line-height: 1.7;
}

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

.required {
  color: var(--error);
}

/* --- Selection --- */
::selection {
  background: var(--primary-100);
  color: var(--primary-dark);
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}