/*
Theme Name: QTheme
Theme URI: https://quangtuyen.com/qtheme
Author: QuangTuyen
Author URI: https://quangtuyen.com
Description: Theme WordPress bán hàng Landing Page - Chốt đơn siêu tốc, tối ưu cho seller Việt Nam.
Version: 1.0.0
Requires at least: 6.0
Requires PHP: 7.4
License: GPLv2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: qtheme
*/

/* ═══════════════════════════════════════════
   DESIGN SYSTEM - CSS CUSTOM PROPERTIES
   ═══════════════════════════════════════════ */
:root {
  /* Color Palette - Premium Vietnamese Commerce */
  --qt-primary: #E53935;
  --qt-primary-dark: #C62828;
  --qt-primary-light: #FF5252;
  --qt-primary-glow: rgba(229, 57, 53, 0.3);

  --qt-secondary: #FF6F00;
  --qt-secondary-light: #FFA000;

  --qt-accent: #FFD600;
  --qt-accent-dark: #F9A825;

  --qt-success: #2E7D32;
  --qt-success-light: #43A047;
  --qt-warning: #F57F17;
  --qt-danger: #D32F2F;
  --qt-info: #1565C0;

  /* Neutrals */
  --qt-bg: #FFFFFF;
  --qt-bg-soft: #F5F5F5;
  --qt-bg-muted: #EEEEEE;
  --qt-bg-dark: #1A1A2E;
  --qt-bg-card: #FFFFFF;

  --qt-text: #212121;
  --qt-text-secondary: #616161;
  --qt-text-muted: #9E9E9E;
  --qt-text-inverse: #FFFFFF;

  --qt-border: #E0E0E0;
  --qt-border-light: #F0F0F0;

  /* Typography */
  --qt-font-body: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --qt-font-heading: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --qt-fs-xs: 0.75rem;
  --qt-fs-sm: 0.875rem;
  --qt-fs-base: 1rem;
  --qt-fs-md: 1.125rem;
  --qt-fs-lg: 1.25rem;
  --qt-fs-xl: 1.5rem;
  --qt-fs-2xl: 2rem;
  --qt-fs-3xl: 2.5rem;
  --qt-fs-4xl: 3rem;

  --qt-fw-normal: 400;
  --qt-fw-medium: 500;
  --qt-fw-semibold: 600;
  --qt-fw-bold: 700;
  --qt-fw-extrabold: 800;

  --qt-lh-tight: 1.2;
  --qt-lh-normal: 1.5;
  --qt-lh-relaxed: 1.75;

  /* Spacing */
  --qt-space-xs: 0.25rem;
  --qt-space-sm: 0.5rem;
  --qt-space-md: 1rem;
  --qt-space-lg: 1.5rem;
  --qt-space-xl: 2rem;
  --qt-space-2xl: 3rem;
  --qt-space-3xl: 4rem;
  --qt-space-4xl: 6rem;

  /* Border Radius */
  --qt-radius-sm: 6px;
  --qt-radius-md: 10px;
  --qt-radius-lg: 16px;
  --qt-radius-xl: 24px;
  --qt-radius-full: 9999px;

  /* Shadows */
  --qt-shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --qt-shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --qt-shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --qt-shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
  --qt-shadow-glow: 0 0 20px var(--qt-primary-glow);

  /* Transitions */
  --qt-transition-fast: 150ms ease;
  --qt-transition-base: 250ms ease;
  --qt-transition-slow: 400ms ease;
  --qt-transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Z-index */
  --qt-z-dropdown: 100;
  --qt-z-sticky: 200;
  --qt-z-fixed: 300;
  --qt-z-modal: 400;
  --qt-z-toast: 500;

  /* Layout */
  --qt-max-width: 480px;
  --qt-max-width-desktop: 1200px;
}

/* ═══════════════════════════════════════════
   CSS RESET & BASE
   ═══════════════════════════════════════════ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

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

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

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

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

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--qt-font-heading);
  font-weight: var(--qt-fw-bold);
  line-height: var(--qt-lh-tight);
  color: var(--qt-text);
}

ul, ol {
  list-style: none;
}

/* ═══════════════════════════════════════════
   UTILITY CLASSES
   ═══════════════════════════════════════════ */
.qt-container {
  width: 100%;
  max-width: var(--qt-max-width);
  margin: 0 auto;
  padding: 0 var(--qt-space-md);
}

.qt-section {
  padding: var(--qt-space-2xl) 0;
}

.qt-section-title {
  font-size: var(--qt-fs-xl);
  font-weight: var(--qt-fw-extrabold);
  text-align: center;
  margin-bottom: var(--qt-space-lg);
  position: relative;
}

.qt-section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--qt-primary), var(--qt-secondary));
  margin: var(--qt-space-sm) auto 0;
  border-radius: var(--qt-radius-full);
}

.qt-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  border-radius: var(--qt-radius-full);
  font-size: var(--qt-fs-xs);
  font-weight: var(--qt-fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.qt-badge--hot {
  background: linear-gradient(135deg, var(--qt-primary), var(--qt-secondary));
  color: var(--qt-text-inverse);
}

.qt-badge--sale {
  background: var(--qt-accent);
  color: var(--qt-text);
}

.qt-badge--new {
  background: var(--qt-success);
  color: var(--qt-text-inverse);
}

.qt-price {
  display: flex;
  align-items: baseline;
  gap: var(--qt-space-sm);
  flex-wrap: wrap;
}

.qt-price__current {
  font-size: var(--qt-fs-2xl);
  font-weight: var(--qt-fw-extrabold);
  color: var(--qt-primary);
}

.qt-price__old {
  font-size: var(--qt-fs-md);
  color: var(--qt-text-muted);
  text-decoration: line-through;
}

.qt-price__discount {
  font-size: var(--qt-fs-sm);
  font-weight: var(--qt-fw-bold);
  color: var(--qt-text-inverse);
  background: var(--qt-primary);
  padding: 2px 8px;
  border-radius: var(--qt-radius-sm);
}

/* Screen Reader Only */
.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;
}

/* ═══════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════ */
@media (min-width: 768px) {
  :root {
    --qt-max-width: 720px;
  }

  .qt-section-title {
    font-size: var(--qt-fs-2xl);
  }
}

@media (min-width: 1024px) {
  :root {
    --qt-max-width: 960px;
  }
}

@media (min-width: 1280px) {
  :root {
    --qt-max-width: var(--qt-max-width-desktop);
  }
}