/* ==========================================================================
   SITCON Branding Website
   ========================================================================== */

:root {
  /* Font families */
  --font-family-zh: "Source Han Sans TC", "Noto Sans TC", "PingFang TC",
    "Microsoft JhengHei";
  --font-family-en: "Nimbus Sans L", "Helvetica Neue", Arial;
  --font-family-base: var(--font-family-en), var(--font-family-zh), system-ui,
    sans-serif;

  /* Base font size - using rem for accessibility */
  --font-size-base: 0.875rem; /* 14px at 16px root */

  /* Font size scale */
  --font-size-xs: 0.625rem; /* 10px */
  --font-size-sm: 0.875rem; /* 14px */
  --font-size-md: 1rem; /* 16px */
  --font-size-lg: 1.125rem; /* 18px */
  --font-size-xl: 1.5rem; /* 24px */
  --font-size-xxl: 1.75rem; /* 28px */
  --font-size-xxxl: 2rem; /* 32px */

  /* Icon size */
  --icon-size-text: 1rem; /* 16px */
  --icon-size: 1.25rem; /* 20px */

  /* Spacing scale */
  --spacing-xs: 0.5rem; /* 8px */
  --spacing-sm: 0.75rem; /* 12px */
  --spacing-md: 1rem; /* 16px */
  --spacing-lg: 1.5rem; /* 24px */
  --spacing-xl: 2rem; /* 32px */
  --spacing-xxl: 3rem; /* 48px */
  --spacing-2xl: 2.5rem; /* 40px - for medium-large spacing needs */
  --spacing-3xl: 3.5rem; /* 56px - for extra large spacing needs */

  /* Container settings */
  --container-padding: 1.25rem; /* 20px */
  --container-max-width: 75rem; /* 1200px */

  /* Breakpoints */
  --breakpoint-sm: 26.5rem; /* 424px */
  --breakpoint-md: 48rem; /* 768px */
  --breakpoint-lg: 64rem; /* 1024px */
  --breakpoint-xl: 75rem; /* 1200px */
  --breakpoint-xxl: 90rem; /* 1440px */

  /* Colors */
  --color-primary: #77b55a;
  --color-primary-light: #86cc65;
  --color-secondary: #3b3b3b;
  --color-success: #65994c;
  --color-error: #994c4c;
  --color-high-contrast: #2d5016;
  --color-white: #ffffff;
  --color-black: #000000;

  /* Line heights */
  --line-height-tight: 1.2;
  --line-height-base: 1.5;
  --line-height-loose: 1.7;
}

/* Reset and Base Styles */
* {
  box-sizing: border-box;
}

html {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  color: var(--color-secondary);
  line-height: var(--line-height-base);
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--color-white);
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  line-height: inherit;
}

/* ==========================================================================
   Header Block
   ========================================================================== */

.header {
  padding-top: var(--spacing-xl);
}

.header__container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding) var(--spacing-sm);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.header__logo-img {
  height: 2rem;
  width: auto;
}

.header__nav {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

.header__nav-link {
  font-size: var(--font-size-sm);
  text-decoration: none;
  font-weight: 400;
  color: var(--color-secondary);
  transition: color 0.2s ease;
  white-space: nowrap;
  line-height: 1;
}

.header__nav-link--active {
  color: var(--color-primary);
  font-weight: 600;
}

.header__nav-link:hover {
  color: var(--color-primary);
}

/* ==========================================================================
   Title Bar Block
   ========================================================================== */

.title-bar {
  background-color: var(--color-primary);
  padding: var(--spacing-md) 0;
}

.title-bar__container {
  max-width: var(--container-max-width);
  margin: 0 auto;
}

.title-bar__title {
  margin: 0;
  color: var(--color-white);
  font-size: var(--font-size-xl);
  font-weight: 600;
  text-align: center;
  line-height: var(--line-height-tight);
}

/* ==========================================================================
   Main Block
   ========================================================================== */

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

.main__container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.main__column {
  width: 100%;
}

.main__column--left {
  margin-bottom: var(--spacing-xxl);
}

/* ==========================================================================
   Content Section Block
   ========================================================================== */

.content-section {
  margin-bottom: var(--spacing-xl);
}

.content-section__title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-secondary);
  margin: 0 0 var(--spacing-sm) 0;
  line-height: 1.2;
}

.content-section__body {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.content-section__description {
  color: var(--color-secondary);
  margin: 0;
  line-height: var(--line-height-base);
}

/* ==========================================================================
   Download Grid Block
   ========================================================================== */

.download-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-sm);
  margin-top: var(--spacing-xs);
}

.download-grid__item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--color-primary-light);
  color: var(--color-black);
  text-decoration: none;
  border-radius: var(--spacing-xs);
  font-size: var(--font-size-sm);
  font-weight: 400;
  transition: all 0.3s ease;
  min-height: 2.5rem;
}

.download-grid__item:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-0.125rem); /* Small lift effect on hover */
  box-shadow: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.1);
}

.download-grid__item:hover .download-grid__icon {
  background-color: var(--color-white);
}

.download-grid__item:active {
  transform: translateY(0);
}

.download-grid__icon {
  mask-image: url(./icons/download.svg);
  mask-size: cover;
  width: var(--icon-size-text);
  height: var(--icon-size-text);
  flex-shrink: 0;
  background-color: var(--color-black);
}

.download-grid__text {
  font-weight: 400;
  white-space: nowrap;
  line-height: 1;
}

/* ==========================================================================
   Color Palette Block
   ========================================================================== */

.color-palette {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xs);
}

.color-palette__item {
  width: 100%;
  height: 7.5rem;
  border-radius: var(--spacing-sm);
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.color-palette__item--primary {
  background-color: var(--color-primary);
  color: var(--color-black);
}

.color-palette__item--white {
  background-color: var(--color-white);
  color: var(--color-black);
  border: 1px solid rgba(0, 0, 0, 0.2);
}

.color-palette__name {
  font-size: var(--font-size-sm);
  font-weight: 500;
  line-height: 1.2;
}

.color-palette__codes {
  font-size: 0.625rem;
  font-weight: 300;
  line-height: 1.2;
}

/* ==========================================================================
   Examples Block
   ========================================================================== */

.examples {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.examples__section {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.examples__header {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.examples__icon {
  mask-size: cover;
  width: var(--icon-size);
  height: var(--icon-size);
  flex-shrink: 0;
}

.examples__icon--correct {
  mask-image: url(./icons/laugh.svg);
  background-color: var(--color-success);
}

.examples__icon--incorrect {
  mask-image: url(./icons/frown.svg);
  background-color: var(--color-error);
}

.examples__title {
  font-weight: 500;
  line-height: 1;
}

.examples__title--correct {
  color: var(--color-success);
}

.examples__title--incorrect {
  color: var(--color-error);
}

.examples__content {
  text-align: left;
  padding-left: calc(var(--icon-size) + var(--spacing-xs));
}

.examples__item {
  margin: 0;
  text-align: left;
}

.examples__item:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   Logo Gallery Block
   ========================================================================== */

.logo-gallery {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  align-content: start;
}

.logo-gallery__item {
  border-radius: var(--spacing-sm);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1;
}

.logo-gallery__item--light {
  background-color: var(--color-white);
  border: 1px solid rgba(0, 0, 0, 0.2);
}

.logo-gallery__item--dark {
  background-color: var(--color-black);
}

.logo-gallery__item--horizontal {
  aspect-ratio: 4/3;
}

.logo-gallery__item--square {
  aspect-ratio: 1;
}

.logo-gallery__img {
  max-width: 80%;
  max-height: 80%;
  object-fit: contain;
}

/* ==========================================================================
   Responsive Design - Small screens and up (424px+)
   ========================================================================== */

@media (min-width: 26.5rem) {
  .logo-gallery {
    grid-template-columns: repeat(2, 1fr);
  }

  .color-palette {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ==========================================================================
   Responsive Design - Medium screens and up (768px+)
   ========================================================================== */

@media (min-width: 48rem) {
  .header__container {
    padding: 0 var(--spacing-2xl) var(--spacing-sm) var(--spacing-2xl);
    flex-wrap: nowrap;
    gap: var(--spacing-lg);
  }

  .header__logo-img {
    height: 2.25rem;
  }

  .header__nav-link {
    font-size: var(--font-size-md);
  }

  .title-bar {
    padding: var(--spacing-md) 0;
  }

  .title-bar__container {
    padding: 0 var(--spacing-2xl);
  }

  .title-bar__title {
    font-size: var(--font-size-xxl);
    text-align: left;
  }

  .main {
    padding: var(--spacing-xl) 0;
  }

  .main__container {
    padding: 0 var(--spacing-2xl);
  }

  .content-section {
    margin-bottom: var(--spacing-2xl);
  }

  .download-grid {
    max-width: 50%;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
  }

  .download-grid__item {
    font-size: var(--font-size-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    min-height: 2.25rem;
  }

  .color-palette {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }

  .color-palette__item {
    height: 8rem;
  }

  .examples {
    flex-direction: row;
    gap: var(--spacing-lg);
  }

  .examples__section {
    flex: 1;
  }

  .logo-gallery {
    gap: var(--spacing-lg);
  }
}

/* ==========================================================================
   Responsive Design - Large screens and up (1024px+)
   ========================================================================== */

@media (min-width: 64rem) {
  .main__container {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-xxl);
  }

  .main__column {
    flex: 1;
  }

  .main__column--left {
    margin-bottom: 0;
  }

  .logo-gallery {
    gap: var(--spacing-lg);
  }

  .logo-gallery__item--square .logo-gallery__img {
    max-width: 70%;
    max-height: 70%;
  }
}

/* ==========================================================================
   Responsive Design - Extra large screens and up (1200px+)
   ========================================================================== */

@media (min-width: 75rem) {
  .title-bar__title {
    font-size: var(--font-size-xxxl);
  }

  .main {
    padding: var(--spacing-xl) 0;
  }

  .content-section {
    margin-bottom: var(--spacing-xxl);
  }

  .content-section__body {
    gap: var(--spacing-xs);
  }

  .download-grid {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(2, 1fr);
  }

  .examples {
    margin-top: var(--spacing-lg);
    gap: var(--spacing-lg);
  }

  .logo-gallery {
    gap: var(--spacing-lg);
  }
}

/* ==========================================================================
   Accessibility Improvements
   ========================================================================== */

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

/* Focus styles for keyboard navigation */
.header__nav-link:focus-visible,
.download-grid__item:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ==========================================================================
   Typography Styles
   ========================================================================== */

/* Mandarin-specific typography adjustment */
p:lang(zh) {
  text-align: justify;
}

em:lang(zh) {
  font-style: inherit;
  font-weight: 500;
}

/* Base heading styles using CSS variables */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: inherit;
  font-weight: 600;
  line-height: var(--line-height-tight);
  margin: 0;
}

h1 {
  font-size: var(--font-size-xxxl);
}

h2 {
  font-size: var(--font-size-lg);
}

h3 {
  font-size: var(--font-size-md);
  font-weight: 500;
}

h4 {
  font-size: var(--font-size-sm);
  font-weight: 500;
}

/* Paragraph styles */
p {
  margin: 0 0 var(--spacing-md) 0;
  line-height: var(--line-height-base);
}

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

/* Link styles */
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* ==========================================================================
   Utility Classes
   ========================================================================== */

/* Text alignment utilities */
.text-center {
  text-align: center;
}
.text-left {
  text-align: left;
}
.text-right {
  text-align: right;
}
.text-justify {
  text-align: justify;
}
.text-nowrap {
  white-space: nowrap;
}

/* Font weight utilities */
.font-light {
  font-weight: 300;
}
.font-normal {
  font-weight: 400;
}
.font-medium {
  font-weight: 500;
}
.font-semibold {
  font-weight: 600;
}
.font-bold {
  font-weight: 700;
}

/* Font size utilities */
.text-xs {
  font-size: var(--font-size-xs);
}
.text-sm {
  font-size: var(--font-size-sm);
}
.text-md {
  font-size: var(--font-size-md);
}
.text-lg {
  font-size: var(--font-size-lg);
}
.text-xl {
  font-size: var(--font-size-xl);
}
.text-xxl {
  font-size: var(--font-size-xxl);
}
.text-xxxl {
  font-size: var(--font-size-xxxl);
}

/* Color utilities */
.text-primary {
  color: var(--color-primary);
}
.text-secondary {
  color: var(--color-secondary);
}
.text-white {
  color: var(--color-white);
}
.text-black {
  color: var(--color-black);
}
.text-success {
  color: var(--color-success);
}
.text-error {
  color: var(--color-error);
}

/* ==========================================================================
   Enhanced Print Styles
   ========================================================================== */

@media print {
  html {
    font-size: 12pt;
    color: var(--color-black);
  }

  .header,
  .title-bar {
    break-inside: avoid;
  }

  h1,
  h2,
  h3,
  h4,
  h5,
  h6 {
    color: var(--color-black);
    page-break-after: avoid;
  }

  p {
    orphans: 3;
    widows: 3;
  }

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

  .download-grid__item {
    border: 1px solid #ccc;
    background-color: #f9f9f9 !important;
  }

  .logo-gallery__item--dark {
    border: 1px solid #ccc;
  }
}