/* ============================================
   DentAlign - Base Styles & Reset
   ============================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  font-weight: var(--weight-normal);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
  transition: background-color var(--duration-slow) var(--ease-out),
              color var(--duration-slow) var(--ease-out);
}

/* Remove default list styles */
ul, ol {
  list-style: none;
}

/* Remove default anchor styles */
a {
  color: inherit;
  text-decoration: none;
}

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

/* Remove built-in form typography styles */
input, button, textarea, select {
  font: inherit;
  color: inherit;
}

/* Avoid text overflows */
p, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
}

/* Remove button styles */
button {
  background: none;
  border: none;
  cursor: pointer;
}

/* ========== TYPOGRAPHY ========== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--text-primary);
}

h1 {
  font-size: var(--text-6xl);
  font-weight: var(--weight-extrabold);
  letter-spacing: var(--tracking-tighter);
}

h2 {
  font-size: var(--text-5xl);
  font-weight: var(--weight-bold);
}

h3 {
  font-size: var(--text-4xl);
}

h4 {
  font-size: var(--text-3xl);
}

h5 {
  font-size: var(--text-2xl);
}

h6 {
  font-size: var(--text-xl);
}

p {
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

.text-gradient {
  background: linear-gradient(
    90deg,
    #00b3c6 0%,
    #00d4aa 25%,
    #00e5ff 50%,
    #00d4aa 75%,
    #00b3c6 100%
  );
  background-size: 300% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-shift 4s linear infinite;
  filter: drop-shadow(0 0 20px rgba(0, 179, 198, 0.3));
}

@keyframes gradient-shift {
  0% { background-position: 0% center; }
  100% { background-position: 300% center; }
}

/* ========== SELECTION ========== */
::selection {
  background-color: var(--color-primary);
  color: var(--text-inverse);
}

/* ========== SCROLLBAR ========== */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: var(--radius-full);
  border: 2px solid var(--bg-tertiary);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-hover);
}

/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--color-primary) var(--bg-tertiary);
}

/* ========== FOCUS STYLES ========== */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

/* ========== CONTAINER ========== */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-8);
  }
}

@media (min-width: 1024px) {
  .container {
    padding-inline: var(--space-12);
  }
}

/* ========== SECTION ========== */
.section {
  padding-block: var(--section-padding);
  position: relative;
}

/* ========== 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;
}

.flex {
  display: flex;
}

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

.grid {
  display: grid;
}

.relative {
  position: relative;
}

.absolute {
  position: absolute;
}

.overflow-hidden {
  overflow: hidden;
}

/* ========== ANIMATION UTILITIES ========== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-up {
  opacity: 0;
  transform: translateY(60px);
}

.fade-in-up.is-visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity var(--duration-slower) var(--ease-out),
              transform var(--duration-slower) var(--ease-out);
}

/* Stagger delays */
.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }
.stagger-5 { transition-delay: 0.5s; }

/* ========== LOADING STATE ========== */
.is-loading {
  pointer-events: none;
  opacity: 0.7;
}

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