/* SurfStudio Landing Page - Modern Dark Theme */

/* ========================
   CSS Variables & Theme
   ======================== */
:root {
  /* Colors - Ultra Dark Theme */
  --color-background: #000000;
  --color-background-secondary: #0a0a0a;
  --color-card-bg: rgba(255, 255, 255, 0.03);
  --color-card-border: rgba(255, 255, 255, 0.08);
  --color-card-hover: rgba(255, 255, 255, 0.05);

  --color-text: #ffffff;
  --color-text-muted: rgba(255, 255, 255, 0.6);
  --color-text-light: rgba(255, 255, 255, 0.4);

  --color-accent: #5865f2;
  --color-accent-hover: #6b79ff;
  --color-accent-muted: rgba(88, 101, 242, 0.1);

  /* Typography */
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;

  /* Spacing - Perfect 8px Grid System */
  --space-xs: 0.5rem;    /* 8px */
  --space-sm: 1rem;      /* 16px */
  --space-md: 1.5rem;    /* 24px */
  --space-lg: 2rem;      /* 32px */
  --space-xl: 3rem;      /* 48px */
  --space-2xl: 4rem;     /* 64px */
  --space-3xl: 6rem;     /* 96px */
  --space-4xl: 8rem;     /* 128px */

  /* Layout */
  --max-width: 1280px;
  --header-height: 72px;

  /* Borders & Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ========================
   Reset & Base Styles
   ======================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

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

/* ========================
   Typography
   ======================== */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: -0.02em;
}

h1 {
  font-size: var(--font-size-5xl);
  font-weight: 700;
  margin-bottom: var(--space-lg);
}

h2 {
  font-size: var(--font-size-4xl);
  font-weight: 600;
  margin-bottom: var(--space-lg);
}

h3 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-md);
}

h4 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-md);
}

h5 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-sm);
}

p {
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

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

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

/* ========================
   Layout Components
   ======================== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section {
  padding: var(--space-3xl) 0;
}

.section--hero {
  padding: var(--space-2xl) 0 var(--space-3xl);
  min-height: calc(100vh - var(--header-height));
  display: flex;
  align-items: center;
  text-align: center;
}

.section--dark {
  background: var(--color-background-secondary);
}

/* ========================
   Header
   ======================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-card-border);
  z-index: 1000;
  transition: all var(--transition-base);
  display: flex;
}

.header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  width: 100%;
  padding: 0 2rem;
}

.header__logo {
  display: flex;
  align-items: center;
  height: 36px;
  z-index: 1001;
}

picture {
  display: block;
}

.header__logo picture {
  height: 100%;
}

.header__logo img {
  height: 100%;
  width: auto;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__list {
  display: flex;
  list-style: none;
  gap: var(--space-xl);
}

.nav__link {
  color: var(--color-text-muted);
  font-size: var(--font-size-base);
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

.nav__link:hover {
  color: var(--color-text);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}

.nav__link:hover::after,
.nav__link--active::after,
.nav__link[data-active="true"]::after {
  width: 100%;
}

.nav__link[data-active="true"] {
  color: var(--color-text);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
  padding-right: 0px;
  z-index: 998;
}

.mobile-menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all var(--transition-base);
  border-radius: 2px;
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: rotate(45deg) translate(7px, 7px);
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* Mobile Menu Overlay */
.mobile-menu {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-background);
  z-index: 999;
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.mobile-menu[aria-hidden="false"] {
  opacity: 1;
  visibility: visible;
}

.mobile-menu__nav {
  display: flex;
  flex-direction: column;
  padding: 0;
}

.mobile-menu__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
  padding: 0;
}

.mobile-menu__link {
  font-size: var(--font-size-2xl);
  font-weight: 500;
  color: var(--color-text);
  transition: all var(--transition-fast);
  display: block;
  padding: var(--space-lg) 0;
  text-align: center;
  width: 100%;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.mobile-menu__link:hover {
  color: var(--color-accent);
  background: rgba(255, 255, 255, 0.02);
}

.mobile-menu__cta {
  padding: var(--space-xl) var(--space-xl);
}

.mobile-menu__cta .btn {
  width: 100%;
  max-width: none;
}

/* ========================
   Buttons
   ======================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xs) var(--space-lg);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: var(--font-size-base);
  text-align: center;
  transition: all var(--transition-base);
  cursor: pointer;
  border: 2px solid;
  font-family: inherit;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  min-width: 160px;
  position: relative;
  overflow: hidden;
}

.btn--outline {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn--outline:hover {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(88, 101, 242, 0.3);
}

.btn--primary {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

.btn--primary:hover {
  background: #7985ff;
  color: white;
  border-color: #7985ff;
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(88, 101, 242, 0.25);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  border-color: var(--color-card-border);
}

.btn--ghost:hover {
  color: var(--color-text);
  border-color: var(--color-text);
  background: rgba(255, 255, 255, 0.05);
}

.btn--large {
  padding: var(--space-md) var(--space-2xl);
  font-size: var(--font-size-lg);
  min-width: 200px;
}

.btn svg {
  margin-left: var(--space-sm);
  transition: transform var(--transition-base);
}

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

/* ========================
   Cards
   ======================== */
.card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-base);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-4px);
  background: var(--color-card-hover);
  border-color: rgba(255, 255, 255, 0.15);
}

.card__title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-xs);
  font-weight: 600;
}

.card__subtitle {
  font-size: var(--font-size-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

.card__description {
  color: var(--color-text-muted);
  font-size: var(--font-size-base);
  line-height: 1.6;
  margin-bottom: var(--space-xl);
  flex-grow: 1;
}

.card__price {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.card__price-period {
  font-size: var(--font-size-base);
  color: var(--color-text-muted);
  font-weight: 400;
}

.card__features {
  list-style: none;
  margin-bottom: var(--space-lg);
  margin-top: var(--space-lg);
}

.card__feature {
  padding: var(--space-xs) 0;
  color: var(--color-text-muted);
  display: flex;
  align-items: flex-start;
  gap: var(--space-xs);
  font-size: 0.95rem;
}

.card__feature::before {
  content: '✓';
  color: var(--color-accent);
  font-weight: bold;
}

.card__cta {
  margin-top: auto;
}

/* ========================
   Grid Layouts
   ======================== */
.grid {
  display: grid;
  gap: var(--space-xl);
}

.grid--2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
}

.grid--4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* ========================
   Feature Cards
   ======================== */
.feature-card {
  padding: var(--space-lg);
  text-align: center;
}

.feature-card__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-lg);
  padding: var(--space-md);
  border-radius: var(--radius-lg);
  background: var(--color-accent-muted);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-card__title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.feature-card__description {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* ========================
   Pricing Cards
   ======================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-3xl);
}

.pricing-card {
  background: var(--color-card-bg);
  border: 2px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-lg);
  transition: all var(--transition-base);
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 450px;
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: var(--color-accent);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.pricing-card--featured {
  border-color: var(--color-accent);
  background: linear-gradient(135deg, rgba(88, 101, 242, 0.1), transparent);
}

/* ========================
   Hero Section
   ======================== */
.hero__content {
  max-width: 800px;
  margin: 0 auto;
}

.hero__title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  margin-bottom: var(--space-xl);
  background: linear-gradient(135deg, #fff, rgba(255, 255, 255, 0.7));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-muted);
  margin-bottom: var(--space-3xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

.hero__actions {
  display: flex;
  gap: var(--space-lg);
  justify-content: center;
  flex-wrap: wrap;
}

.hero__image {
  margin-top: var(--space-3xl);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.hero__image img {
  width: 100%;
  max-width: 1000px;
  height: auto;
  display: block;
  aspect-ratio: 3056 / 1868;
  border-radius: var(--radius-lg);
}

/* Feature section images */
.feature-img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

/* ========================
   Footer
   ======================== */
.footer {
  background: var(--color-background-secondary);
  border-top: 1px solid var(--color-card-border);
  padding: var(--space-2xl) 0 var(--space-lg);
  margin-top: var(--space-3xl);
}

.footer__content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-2xl);
}

.footer__brand h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-sm);
}

.footer__brand p {
  color: var(--color-text-light);
  max-width: 300px;
  font-size: 0.95rem;
}

.footer__section h4 {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.footer__list {
  list-style: none;
}

.footer__list li {
  margin-bottom: var(--space-xs);
}

.footer__list a {
  color: var(--color-text-light);
  transition: color var(--transition-fast);
  font-size: 0.95rem;
}

.footer__list a:hover {
  color: var(--color-text);
}

.footer__bottom {
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-card-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer__copyright {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
}

.footer__social {
  display: flex;
  gap: var(--space-md);
}

.footer__social a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-card-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: all var(--transition-base);
}

.footer__social a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

/* ========================
   Animations
   ======================== */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* SPA Page Visibility */
[data-page] {
  display: none;
}

[data-page].active {
  display: block;
  animation: fadeIn 0.3s ease-out;
}

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

.fade-in-delay {
  animation: fadeIn 0.6s ease-out 0.2s both;
}

/* ========================
   Forms
   ======================== */
.form__group {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  margin-bottom: var(--space-lg);
  width: 100%;
  box-sizing: border-box;
}

.form__label {
  flex-shrink: 0;
  width: 280px;
  padding-right: 0;
  text-align: right;
  color: var(--color-text);
  font-size: var(--font-size-base);
  font-weight: 500;
  white-space: normal;
  word-wrap: break-word;
  line-height: 1.4;
}

.form__input,
.form__textarea,
.form__select {
  flex: 1;
  min-width: 0;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 14px 20px;
  color: var(--color-text);
  font-size: var(--font-size-base);
  font-family: var(--font-primary);
  line-height: 1.6;
  transition: all var(--transition-base);
}

.form__input:focus,
.form__textarea:focus,
.form__select:focus {
  outline: none;
  border-color: var(--color-accent);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: 0 0 0 3px rgba(88, 101, 242, 0.1);
}

.form__input::placeholder,
.form__textarea::placeholder {
  color: rgba(255, 255, 255, 0.3);
}

.form__select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%23ffffff' stroke-opacity='0.5' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 18px center;
  padding-right: 48px;
}

.form__select option {
  background: var(--color-background);
  color: var(--color-text);
}

.form__textarea {
  min-height: 120px;
  resize: vertical;
  line-height: 1.8;
}

.form__submit {
  width: 100%;
  margin-top: var(--space-2xl);
  padding: 16px 32px;
  font-size: var(--font-size-lg);
}

/* Form container spacing */
#launch-form {
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
  padding: var(--space-2xl);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 16px;
  box-sizing: border-box;
}

/* Responsive form layout */
@media (max-width: 768px) {
  .form__group {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-sm);
  }

  .form__label {
    flex: none;
    text-align: left;
  }

  #launch-form {
    padding: var(--space-xl);
  }
}

/* ========================
   Utility Classes
   ======================== */
.text-center {
  text-align: center;
}

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

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

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

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }
.mb-3xl { margin-bottom: var(--space-3xl); }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }
.mt-3xl { margin-top: var(--space-3xl); }

/* ========================
   Responsive Design
   ======================== */
@media (max-width: 1024px) {
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: var(--space-3xl) auto 0;
  }
}

@media (max-width: 970px) {
  .nav {
    display: none;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .footer__content {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
    text-align: center;
  }

  .footer__brand {
    order: -1;
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-card-border);
  }

  .footer__brand h3 {
    font-size: var(--font-size-lg);
  }

  .footer__brand p {
    margin: 0 auto;
    font-size: 0.9rem;
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-lg);
    text-align: center;
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.5rem;
    --font-size-2xl: 1.25rem;

    /* Adjusted spacing for mobile */
    --space-xs: 0.5rem;    /* 8px */
    --space-sm: 0.75rem;   /* 12px */
    --space-md: 1rem;      /* 16px */
    --space-lg: 1.5rem;    /* 24px */
    --space-xl: 2rem;      /* 32px */
    --space-2xl: 3rem;     /* 48px */
    --space-3xl: 4rem;     /* 64px */
    --space-4xl: 5rem;     /* 80px */
  }

  .hero__actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 300px;
  }

  .footer {
    padding: var(--space-xl) 0 var(--space-lg);
  }

  .footer__section h4 {
    margin-bottom: var(--space-sm);
    font-size: 0.75rem;
  }

  .footer__list li {
    margin-bottom: 0.25rem;
  }

  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }

  /* Ensure images appear first in detailed feature sections on mobile */
  .grid.grid--2 {
    display: flex;
    flex-direction: column;
  }

  .grid.grid--2 > div:has(img) {
    order: -1;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-lg);
  }

  .section {
    padding: var(--space-3xl) 0;
  }
}