/* 
   Modern Design System & Reset 
   Theme: Pronunciation Web
*/

:root {
  /* --- Colors --- */
  /* Primary: Deep Navy */
  --color-primary: #2C3E50;
  --color-primary-light: #34495e;
  /* Accent: Warm Orange */
  --color-accent: #E67E22;
  --color-accent-hover: #d35400;

  /* Neutrals */
  --color-bg: #F9FAFB;
  --color-surface: #FFFFFF;
  --color-text: #2D2D2D;
  --color-text-light: #52606D;
  --color-border: #E2E8F0;

  /* --- Typography --- */
  --font-heading: "Catamaran", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-body: "Open Sans", "Inter", system-ui, -apple-system, sans-serif;

  --text-base: 16px;
  --text-scale-ratio: 1.25;

  --text-xs: 0.8rem;
  --text-sm: 0.9rem;
  --text-md: 1rem;
  --text-lg: 1.25rem;
  --text-xl: 1.563rem;
  --text-2xl: 1.953rem;
  --text-3xl: 2.441rem;

  /* --- Spacing System (8px scale) --- */
  --space-1: 0.5rem;
  /* 8px */
  --space-2: 1rem;
  /* 16px */
  --space-3: 1.5rem;
  /* 24px */
  --space-4: 2rem;
  /* 32px */
  --space-6: 3rem;
  /* 48px */
  --space-8: 4rem;
  /* 64px */

  /* --- Borders & Effects --- */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

html {
  font-size: var(--text-base);
  scroll-behavior: smooth;
  background-color: #FFFFFF;
  /* Outer white background */
  height: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

/* Desktop Frame (>800px) */
@media (min-width: 801px) {
  body {
    max-width: 1200px;
    margin: 2rem auto;
    /* Centered frame */
    padding: 2rem;
    /* Added Buffer Space */
    min-height: calc(100% - 4rem);
    /* Adjust for margins */
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.1);
    /* Frame Shadow */
    border-radius: var(--radius-md);
    position: relative;
    overflow-x: hidden;
  }

  footer {
    margin-left: -2rem;
    margin-right: -2rem;
    margin-bottom: -2rem;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    width: calc(100% + 4rem);
    max-width: none;
  }
}

/* Minimal Pairs Horizontal Grid */
.minimal-pairs {
  padding-top: var(--space-6);
}


.vowel-section {
  display: flex !important;
  /* Force flex */
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
}

.vowel-section h3 {
  width: 100%;
  text-align: center;
  margin-bottom: var(--space-4);
}

.pair-box {
  width: auto !important;
  /* Override fixed widths */
  min-width: 150px;
  max-width: 200px;
  flex: 1 1 auto;
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  margin: 0 !important;
  /* Remove legacy margins */
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-2);
  background-color: #fff;
  transition: transform 0.2s, box-shadow 0.2s;
}

.pair-box:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
}

.pair-word {
  width: 50%;
  text-align: center;
  font-weight: 600;
  color: var(--color-primary);
  font-size: var(--text-lg);
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

ul,
ol {
  list-style-position: inside;
}

/* --- Typography Helpers --- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

h1 {
  font-size: var(--text-3xl);
}

h2 {
  font-size: var(--text-2xl);
}

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

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

p {
  margin-bottom: var(--space-2);
}

/* --- Layout Utilities --- */
.container {
  width: 100%;
  max-width: 1000px;
  /* Aligns with desktop specific width in original css */
  margin: 0 auto;
  padding: 0 var(--space-2);
}

.wrapper {
  /* Legacy wrapper support, aliasing to container logic */
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 var(--space-2);
}

.grid {
  display: grid;
  gap: var(--space-3);
}

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

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.mb-2 {
  margin-bottom: var(--space-2);
}

.mb-4 {
  margin-bottom: var(--space-4);
}

/* --- Components --- */

/* Buttons */
.btn {
  display: inline-block;
  background-color: var(--color-primary);
  color: #fff;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-transform: uppercase;
  font-family: var(--font-heading);
  letter-spacing: 0.5px;
  border: none;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
}

.btn:hover {
  background-color: var(--color-primary-light);
  color: #fff;
  text-decoration: none;
  transform: translateY(-1px);
}

/* Cards / Content Boxes */
.card,
.info-box,
.blend-box,
.pair-box,
.vowel-box,
.vowel-section,
.vowel-length-info {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  margin-bottom: var(--space-4);
  box-shadow: var(--shadow-sm);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transition: box-shadow 0.3s ease;
}

.card h2,
.card h3,
.card h4 {
  margin-top: 0;
}

/* Navbar */
header {
  background-color: var(--color-surface);
  border-bottom: 3px solid var(--color-primary);
  box-shadow: var(--shadow-sm);
  padding: var(--space-2) 0;
}

header .header-brand {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 900;
  text-transform: uppercase;
  color: var(--color-primary);
  display: block;
  text-align: center;
  margin-bottom: var(--space-2);
}

header nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
  list-style: none;
  padding: 0;
}

header nav ul li a {
  font-family: var(--font-heading);
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-text);
  padding: var(--space-1);
}

header nav ul li a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

@media (min-width: 768px) {
  header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-2) var(--space-4);
  }

  header .header-brand {
    margin-bottom: 0;
    text-align: left;
    border-right: 2px solid var(--color-border);
    padding-right: var(--space-3);
    margin-right: var(--space-3);
  }
}

/* Hero Banner */
.index-banner {
  background-image: linear-gradient(rgba(44, 62, 80, 0.8), rgba(44, 62, 80, 0.8)), url('img/banner.jpg');
  background-size: cover;
  background-position: center;
  padding: var(--space-8) var(--space-2);
  text-align: center;
  color: #fff;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  margin-bottom: var(--space-6);
  min-height: 400px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.index-banner h1,
.index-banner h2 {
  color: #fff;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.index-banner h2 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  margin-bottom: var(--space-2);
  line-height: 1.1;
}

.index-banner h1 {
  font-family: "Cormorant Garamond", serif;
  font-size: var(--text-xl);
  font-weight: 300;
  font-style: italic;
}

/* Index Links / Grid */
.index-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.index-boxlink-square,
.index-boxlink-rectangle {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  height: 150px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: var(--shadow-sm);
  width: 100% !important;
  /* Override inline styles or old css */
  float: none !important;
}

.index-boxlink-square:hover,
.index-boxlink-rectangle:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
}

.index-boxlink-square h3,
.index-boxlink-rectangle h3 {
  margin: 0;
  text-transform: uppercase;
  color: var(--color-primary);
  font-size: var(--text-lg);
}

/* Main Text */
.main-text {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--space-2);
  font-size: var(--text-md);
}

/* Contact Form */
.contact-section {
  max-width: 600px;
  margin: 0 auto;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.contact-form input,
.contact-form textarea {
  padding: var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-md);
}

.contact-form button {
  align-self: flex-start;
  /* extend btn */
  display: inline-block;
  background-color: var(--color-primary);
  color: #fff;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-transform: uppercase;
  font-family: var(--font-heading);
  letter-spacing: 0.5px;
  border: none;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
}

/* Footer */
footer {
  background-color: var(--color-primary);
  color: #fff;
  padding: var(--space-6) var(--space-4);
  margin-top: var(--space-8);
  text-align: center;
  /* Center text */
}

footer a {
  color: #e0e0e0;
}

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

footer ul {
  list-style: none;
  padding: 0;
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  max-width: 1000px;
  margin: 0 auto;
  align-items: center;
  /* Center items in column mode */
}

@media (min-width: 768px) {
  .footer-content {
    flex-direction: row;
    justify-content: center;
    /* Center items in row mode */
    gap: var(--space-8);
    /* Add space between columns */
    align-items: flex-start;
    /* Align top */
  }
}

.footer-sm {
  display: flex;
  gap: var(--space-2);
}

.footer-sm img {
  width: 32px;
  height: 32px;
  filter: grayscale(100%) brightness(200%);
  transition: filter 0.2s;
}

.footer-sm a:hover img {
  filter: none;
}

/* Page Specific Adjustments (Legacy Class Mapping) */
/* Vowels, Wordstress, Rhythm Helpers */

.insidebox-word p,
.insidebox-ssword p {
  margin: var(--space-1) 0;
}

/* Highlight boxes for content/structure words or correct/incorrect */
.highlight-box {
  background-color: var(--color-bg);
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--color-accent);
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-3) 0;
}

th,
td {
  padding: var(--space-2);
  border: 1px solid var(--color-border);
  text-align: left;
}

th {
  background-color: var(--color-bg);
  font-weight: 700;
  color: var(--color-primary);
}

/* Minimal Pairs Navigation Links */
.vowel-nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
  list-style: none;
  padding: 0;
  margin-bottom: var(--space-4);
}

.vowel-nav li a {
  display: inline-block;
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  font-weight: 600;
  transition: all 0.2s ease;
}

.vowel-nav li a:hover {
  background-color: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
  text-decoration: none;
}

/* Multi-language Support */
body.show-en .lang-vi {
  display: none !important;
}

body.show-vi .lang-en {
  display: none !important;
}

#lang-switcher {
  position: absolute;
  top: 1rem;
  right: 1rem;
  display: flex;
  gap: 0.5rem;
  z-index: 1000;
}

.lang-flag {
  cursor: pointer;
  opacity: 0.4;
  font-size: 1.5rem;
  border: none;
  background: none;
  transition: all 0.2s;
  padding: 0;
}

.lang-flag:hover {
  opacity: 0.8;
  transform: scale(1.1);
}

.lang-flag.active {
  opacity: 1;
  transform: scale(1.2);
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}