/* ============================================
   TAOQIMIAO — Base Styles
   Reset, Typography, Global Defaults
   ============================================ */

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

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

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--font-regular);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

input, button, textarea, select {
  font: inherit;
  color: inherit;
}

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

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

table {
  border-collapse: collapse;
}

/* ---- Typography ---- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  color: var(--color-gray-800);
  letter-spacing: var(--tracking-tight);
}

h1 {
  font-size: var(--text-5xl);
  margin-bottom: var(--space-6);
}

h2 {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-5);
}

h3 {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-4);
}

h4 {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-3);
}

h5 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

h6 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
}

p {
  margin-bottom: var(--space-4);
  color: var(--color-text);
}

p:last-child {
  margin-bottom: 0;
}

strong {
  font-weight: var(--font-semibold);
}

small {
  font-size: var(--text-sm);
}

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

/* ---- Focus Styles ---- */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

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

::-webkit-scrollbar-track {
  background: var(--color-gray-100);
}

::-webkit-scrollbar-thumb {
  background: var(--color-gray-300);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-400);
}

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

.text-uppercase {
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
}

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

.font-heading { font-family: var(--font-heading); }
.font-body { font-family: var(--font-body); }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---- Separator ---- */
.separator {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border: none;
  margin: var(--space-6) 0;
}

.separator--center {
  margin-left: auto;
  margin-right: auto;
}

/* ---- Section Label (Eyebrow Text) ---- */
.section-label {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-widest);
  color: var(--color-accent-dark);
  margin-bottom: var(--space-4);
}

/* ---- Section Description ---- */
.section-description {
  font-size: var(--text-lg);
  color: var(--color-text-light);
  max-width: 600px;
  line-height: var(--leading-relaxed);
}

.section-description--center {
  margin-left: auto;
  margin-right: auto;
}

/* ---- Scroll Animations ---- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slow) var(--ease-out-expo),
              transform var(--transition-slow) var(--ease-out-expo);
}

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

.fade-in-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity var(--transition-slow) var(--ease-out-expo),
              transform var(--transition-slow) var(--ease-out-expo);
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity var(--transition-slow) var(--ease-out-expo),
              transform var(--transition-slow) var(--ease-out-expo);
}

.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.scale-in {
  opacity: 0;
  transform: scale(0.95);
  transition: opacity var(--transition-slow) var(--ease-out-expo),
              transform var(--transition-slow) var(--ease-out-expo);
}

.scale-in.visible {
  opacity: 1;
  transform: scale(1);
}

/* ---- Stagger children ---- */
.stagger-children > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.4s var(--ease-out-expo),
              transform 0.4s var(--ease-out-expo);
}

.stagger-children.visible > *:nth-child(1) { transition-delay: 0.05s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(2) { transition-delay: 0.1s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(3) { transition-delay: 0.15s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(4) { transition-delay: 0.2s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(5) { transition-delay: 0.25s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(6) { transition-delay: 0.3s; opacity: 1; transform: translateY(0); }