/* ==========================================================================
   Design Tokens
   ========================================================================== */

:root {
  /* Colors */
  --color-bg: #f0ede9;
  --color-bg-nav-mobile: #cbc1b3;
  --color-text-primary: #000;
  --color-text-secondary: #1a1a1a;
  --color-text-muted: #8c8c8c;
  --color-accent: #db3732;
  --color-white: #fff;
  --color-overlay-light: rgba(255, 255, 255, 0.5);
  --color-overlay-medium: rgba(255, 255, 255, 0.7);

  /* Typography - Font Families */
  --font-display: 'Cal Sans', sans-serif;
  --font-serif: 'Instrument Serif', serif;
  --font-body: 'DM Sans', sans-serif;

  /* Typography - Font Sizes */
  --text-xs: 0.875em;    /* 14px - footer */
  --text-sm: 1em;        /* 16px - base */
  --text-md: 1.125em;    /* 18px - nav */
  --text-lg: 1.25em;     /* 20px - approach, contact */
  --text-xl: 1.5em;      /* 24px - about body */
  --text-2xl: 2em;       /* 32px - logo mobile */
  --text-3xl: 2.5em;     /* 40px - logo, section titles, contact links */
  --text-4xl: 3.75em;    /* 60px - closing message */

  /* Spacing */
  --space-xs: 7px;
  --space-sm: 10px;
  --space-md: 15px;
  --space-lg: 20px;
  --space-xl: 30px;
  --space-2xl: 40px;
  --space-3xl: 50px;
  --space-4xl: 80px;
  --space-5xl: 100px;
  --space-6xl: 150px;
  --space-7xl: 250px;

  /* Layout */
  --h-margin: var(--space-6xl);
  --nav-height: 48px;
  --touch-target-min: 44px;
  --border-radius-sm: 4px;
  --border-radius-md: 20px;
  --border-radius-pill: 24px;
  --border-radius-circle: 25px;

  /* Transitions - ease-out for natural deceleration */
  --transition-fast: 150ms ease-out;
  --transition-normal: 200ms ease-out;

  /* Line heights */
  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;

  /* Z-index scale */
  --z-nav: 20;
  --z-skip-link: 1000;
}

/* Responsive overrides */
@media screen and (max-width: 1300px) {
  :root {
    --h-margin: var(--space-3xl);
  }
}

@media screen and (max-width: 568px) {
  :root {
    --h-margin: var(--space-xl);
  }
}

/* ==========================================================================
   Reset & Base
   ========================================================================== */

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

html {
  font-size: 1em;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  background-color: var(--color-bg);
  color: var(--color-text-primary);
}

/* ==========================================================================
   Accessibility
   ========================================================================== */

/* Skip link for keyboard navigation */
.skip-link {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  padding: 12px 24px;
  background-color: var(--color-text-primary);
  color: var(--color-white);
  text-decoration: none;
  font-family: var(--font-body);
  font-weight: 500;
  border-radius: var(--border-radius-sm);
  z-index: var(--z-skip-link);
  transition: top var(--transition-normal);
}

.skip-link:focus {
  top: var(--space-sm);
}

/* Focus styles for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--color-text-primary);
  outline-offset: 2px;
}

/* Reduced motion for accessibility */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

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

.page-container {
  width: 100%;
  padding-bottom: var(--space-5xl);
}

.section-container {
  margin: var(--space-3xl) var(--h-margin) 0 var(--h-margin);
  contain: layout style;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.logo-group {
  font-family: var(--font-display);
  text-transform: uppercase;
  font-size: var(--text-3xl);
  margin: var(--space-xl) 0 0 var(--space-2xl);
}

.logo-name {
  color: var(--color-text-primary);
  margin-bottom: calc(-1 * var(--space-xs));
}

.logo-company {
  color: var(--color-text-muted);
}

.nav-container {
  position: absolute;
  display: flex;
  gap: var(--space-md);
  align-items: center;
  justify-content: center;
  right: var(--space-2xl);
  top: var(--space-2xl);
  z-index: var(--z-nav);
  transition: opacity var(--transition-normal);
}

.nav-button {
  display: flex;
  height: var(--nav-height);
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--border-radius-pill);
  font-family: var(--font-display);
  font-size: var(--text-md);
  text-transform: uppercase;
  color: var(--color-text-primary);
  text-decoration: none;
  transition: background-color var(--transition-normal);
}

.nav-button:hover {
  background-color: var(--color-overlay-light);
}

.nav-button-contact {
  background-color: var(--color-overlay-medium);
}

.nav-button-contact:hover {
  background-color: var(--color-white);
}

/* Mobile navigation controls - hidden on desktop */
.nav-menu,
.nav-close {
  display: none;
  color: var(--color-text-primary);
}

/* Mobile navigation */
@media screen and (max-width: 568px) {
  .nav-container {
    position: fixed;
    top: 0;
    right: 0;
    width: 80%;
    height: 100%;
    background-color: var(--color-bg-nav-mobile);
    flex-wrap: wrap;
    align-content: flex-start;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    visibility: hidden;
    opacity: 0;
  }

  .nav-container:target {
    visibility: visible;
    opacity: 1;
  }

  .logo-group {
    font-size: var(--text-2xl);
  }

  .nav-menu {
    display: block;
    position: absolute;
    top: var(--space-2xl);
    right: var(--space-xl);
    color: var(--color-text-primary);
  }

  .nav-button {
    width: 80%;
    min-height: var(--touch-target-min);
    height: fit-content;
  }

  .nav-close {
    width: 100%;
    height: var(--space-4xl);
    margin: var(--space-sm) var(--space-xl) var(--space-lg) var(--space-lg);
    display: flex;
    place-items: end;
    justify-content: end;
    color: var(--color-text-primary);
  }

  .nav-close svg {
    width: 50px;
    height: 50px;
    padding: var(--space-sm);
    border-radius: var(--border-radius-circle);
    transition: background-color var(--transition-normal);
  }

  .nav-close svg:hover {
    background-color: var(--color-white);
  }
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero-section {
  margin: calc(-1 * var(--space-lg)) 0 0 0;
  text-align: center;
}

.hero-image {
  mask-image: linear-gradient(
    to top,
    transparent 0%,
    black 20%,
    black 80%,
    transparent 100%
  );
}

@media screen and (max-width: 568px) {
  .hero-section {
    margin: 0;
  }

  .hero-section img {
    content: url('/images/happy-founders-sm.svg');
    width: 100%;
    height: 344px;
  }
}

/* ==========================================================================
   Section Titles
   ========================================================================== */

.section-title {
  font-size: var(--text-3xl);
  font-weight: 400;
  text-align: center;
  color: var(--color-text-primary);
  font-family: var(--font-serif);
  font-style: italic;
}

/* ==========================================================================
   About Section
   ========================================================================== */

.about-container {
  margin-top: var(--space-3xl);
  display: flex;
  flex-wrap: nowrap;
  flex-direction: row;
  justify-content: space-between;
  gap: var(--space-2xl);
}

.about-text {
  flex-grow: 2;
  font-family: var(--font-body);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
}

.about-text ul {
  list-style-type: disc;
  padding-left: 0;
}

.about-text li {
  margin-left: var(--space-2xl);
  margin-bottom: 0;
}

.about-text p + p {
  margin-top: var(--space-lg);
}

@media screen and (max-width: 568px) {
  .about-container {
    flex-wrap: wrap;
  }
}

/* ==========================================================================
   Approach Section
   ========================================================================== */

.approach-grid {
  margin-top: var(--space-3xl);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl) var(--space-md);
}

.approach-item {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  color: var(--color-text-primary);
  line-height: var(--leading-normal);
  min-height: 162px;
}

.approach-bold {
  font-weight: 700;
}

@media screen and (max-width: 568px) {
  .approach-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .approach-item {
    min-height: auto;
  }
}

/* ==========================================================================
   Logos Carousel
   ========================================================================== */

.logos-carousel {
  margin-top: var(--space-3xl);
  overflow: hidden;
  display: flex;
  gap: var(--space-4xl);
  mask-image: linear-gradient(
    to left,
    transparent 0%,
    black 20%,
    black 80%,
    transparent 100%
  );
  contain: layout paint style;
}

.logos-carousel > * {
  flex: 0 0 100%;
}

.logos-group {
  display: flex;
  gap: var(--space-4xl);
  align-items: center;
  justify-content: center;
  will-change: transform;
  animation: scroll-infinite 40s linear infinite;
}

@keyframes scroll-infinite {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-100%);
  }
}

/* ==========================================================================
   Contact Section
   ========================================================================== */

.contact-section {
  margin: var(--space-3xl) var(--h-margin) var(--space-7xl) var(--h-margin);
  contain: layout style;
}

.contact-grid {
  margin-top: var(--space-3xl);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

.contact-text {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text-primary);
  line-height: var(--leading-normal);
}

.contact-text p {
  margin-bottom: 0;
}

.contact-text p + p {
  margin-top: var(--space-lg);
}

.contact-link {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  color: var(--color-text-primary);
  text-decoration: none;
  line-height: normal;
  margin-bottom: var(--space-xs);
}

.contact-link:hover {
  text-decoration: underline;
}

.email-link {
  font-family: var(--font-body);
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
}

.email-link:hover {
  text-decoration: underline;
}

@media screen and (max-width: 568px) {
  .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
}

/* ==========================================================================
   Footer
   ========================================================================== */

footer {
  margin: var(--space-3xl) var(--h-margin) var(--space-lg) var(--h-margin);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  align-items: end;
  justify-items: start;
  contain: layout style;
}

.footer-text {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 400;
  color: var(--color-text-primary);
  line-height: normal;
}

.closing-message {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  color: var(--color-accent);
  line-height: normal;
  text-align: right;
  justify-self: stretch;
}

@media screen and (max-width: 568px) {
  footer {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .footer-text {
    order: 2;
  }
}