/* ===== OPTIMIZED INDEX.CSS v2.0 ===== */

/* Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 500;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  position: relative;
  overflow: hidden;
  min-width: 160px;
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: #fff;
  box-shadow: 0 0 12px rgba(9, 139, 255, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 0 18px rgba(9, 139, 255, 0.55);
  transform: var(--transform-lift-sm);
}

.btn-primary::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.2);
  transition: left var(--transition-slow);
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

.btn-secondary:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

/* Scroll-Snap Container */
.snap-container {
  height: 100vh;
  overflow-y: auto;
  scroll-snap-type: y mandatory;
}

.section {
  scroll-snap-align: start;
  scroll-snap-stop: always;
  min-height: 100vh;
}

/* Base Styles */
html,
body {
  height: 100%;
  overflow-x: hidden;
  touch-action: pan-y;
  scroll-behavior: smooth;
  scroll-snap-type: y mandatory;
  scroll-padding-top: var(--header-height);
  transition: padding-bottom var(--transition-base);
  -webkit-font-smoothing: antialiased;
  font-kerning: normal;
  font-variant-ligatures: common-ligatures contextual;
  font-feature-settings: "kern" 1, "liga" 1, "calt" 1;
}

body {
  font-family: var(--font-inter);
  background: var(--bg-primary);
  color: var(--text-primary);
  margin: 0;
  text-rendering: optimizeLegibility;
  scroll-snap-align: start;
  scroll-snap-stop: always;
}

.snap-container.no-snap {
  scroll-snap-type: none !important;
}

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

/* Container System */
.container {
  width: 100%;
  max-width: 900px;
  margin-inline: auto;
  padding-inline: max(
    clamp(0.5rem, 4vw, 1.5rem),
    env(safe-area-inset-left, 0px)
  );
  box-sizing: border-box;
}

/* Section Snap Behavior */
.snap-section {
  scroll-snap-align: start;
  opacity: 0.8;
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.snap-section.in-view {
  opacity: 1;
  transform: var(--transform-none);
}

.snap-section.section-active {
  z-index: 2;
}

/* Section Headers */
.section-header {
  text-align: center;
  margin-bottom: clamp(1.75rem, 3vw, 2.5rem);
  margin-top: 0;
  padding: 0;
  position: relative;
  z-index: 2;
}

.section-title {
  position: relative;
  display: inline-block;
  font-size: clamp(1.5rem, 4.5vw, 2.5rem);
  margin-bottom: clamp(1rem, 2vw, 1.25rem);
  padding: 0;
  font-weight: 700;
  background: linear-gradient(135deg, #ffffff 0%, rgba(255, 255, 255, 0.9) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: clamp(50px, 8vw, 70px);
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color) 0%, var(--primary-light) 50%, var(--primary-color) 100%);
  border-radius: var(--radius-full);
  box-shadow: 0 0 15px rgba(7, 161, 255, 0.5);
}

.section-subtitle {
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  color: var(--text-secondary);
  margin-bottom: clamp(1.5rem, 3vw, 2rem);
  font-weight: 400;
  line-height: 1.5;
  opacity: 0.9;
}

/* Error Handling */
.section-error-box {
  margin: var(--spacing-md) 0;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  background: linear-gradient(145deg, rgba(255, 0, 0, 0.08), rgba(255, 0, 0, 0.03));
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  box-shadow: var(--shadow-sm);
}

.section-retry {
  appearance: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem 0.9rem;
  font: inherit;
  border-radius: var(--radius-sm);
  background: var(--primary-color);
  color: #fff;
  line-height: 1.1;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 500;
  box-shadow: var(--shadow-sm);
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.section-retry:hover {
  background: var(--primary-dark, #0051d5);
}

.section-retry:active {
  transform: translateY(1px);
  box-shadow: var(--shadow-sm);
}

.section-retry:focus-visible {
  outline: 2px solid var(--primary-light, #34aadc);
  outline-offset: 2px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1, h2, h3 {
  letter-spacing: -0.012em;
}

h4, h5, h6 {
  letter-spacing: -0.006em;
}

@supports (text-wrap: balance) {
  h1, h2, h3, h4, h5, h6, .section-title {
    text-wrap: balance;
  }
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
}

h5 {
  font-size: 1.125rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
  line-height: 1.6;
  letter-spacing: 0.003em;
}

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

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

/* Loading Screen */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-primary);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  transition: opacity var(--transition-slow);
}

.loading-screen.hide {
  opacity: 0;
  pointer-events: none;
}

.loader {
  width: 60px;
  height: 60px;
  border: 3px solid rgba(255, 255, 255, 0.1);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Animations */
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Mobile Layout */
@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  .section {
    min-height: 100svh;
    height: auto;
    padding: var(--spacing-xl) 0;
  }

  @supports (min-height: 100dvh) {
    .section {
      min-height: 100dvh;
    }
  }

  .section .container {
    padding-top: calc(var(--header-height) + env(safe-area-inset-top, 0px));
    padding-bottom: calc(20px + env(safe-area-inset-bottom, 0px));
  }
}

@media (max-width: 480px) {
  .container {
    max-width: 100vw;
    padding-inline: max(0.5rem, env(safe-area-inset-left, 0px));
  }

  body {
    padding-top: calc(var(--header-height) + env(safe-area-inset-top, 0px));
  }

  .features-content {
    padding: 0 var(--spacing-sm);
  }

  .card {
    padding: calc(var(--spacing-sm) * 0.9);
  }

  .card .icon-wrapper {
    width: 45px;
    height: 45px;
    font-size: 1.8rem;
  }
}

@media (max-width: 375px) {
  html {
    font-size: 14px;
  }

  .container {
    padding-inline: max(0.25rem, env(safe-area-inset-left, 0px));
  }

  .section {
    padding: var(--spacing-lg) 0;
  }
}

@media (max-width: 600px) {
  .snap-section,
  .section {
    scroll-snap-align: center;
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus Indicators */
*:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 3px;
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--primary-color) 55%, transparent);
  transition: box-shadow 0.15s ease, outline-color 0.15s ease;
}

@media (prefers-contrast: more) {
  *:focus-visible {
    outline: 3px solid #ffffff;
    outline-offset: 4px;
    box-shadow: 0 0 0 5px #000, 0 0 0 8px var(--primary-color);
  }
}

@media (forced-colors: active) {
  *:focus-visible {
    outline: 2px solid ButtonText;
    outline-offset: 4px;
    box-shadow: none;
  }
}

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

/* Hide Scrollbar */
::-webkit-scrollbar {
  width: 0px;
  height: 0px;
  background: transparent;
}

html {
  @supports (scrollbar-width: none) {
    scrollbar-width: none;
  }
  -ms-overflow-style: none;
}

/* Print Styles */
@media print {
  .loading-screen {
    display: none !important;
  }

  body {
    color: black;
    background: white;
    font-size: 12pt;
  }

  .container {
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
  }

  a {
    color: black;
    text-decoration: underline;
  }

  button,
  .btn {
    display: none !important;
  }

  * {
    animation: none !important;
    transition: none !important;
  }
}

/* Hide Section Headers (Page-specific) */
#hero .section-header,
#hero .section-subtitle,
#features .section-header,
#features .section-subtitle,
#features .features-content .section-header,
#features .features-content .section-subtitle,
#about .section-header,
#about .section-subtitle {
  display: none !important;
  visibility: hidden !important;
  opacity: 0 !important;
  height: 0 !important;
  margin: 0 !important;
  padding: 0 !important;
}