/* ============================================
   ACADEMIC MINIMALIST DESIGN SYSTEM
   Home Library Organization Service
   ============================================ */

:root {
  /* Color Palette - Academic Minimalist */
  --color-primary: #1B263B;
  --color-secondary: #F5EBE0;
  --color-accent: #8B5E3C;
  --color-text: #2C2C2C;
  --color-text-light: #6B6B6B;
  --color-white: #FFFFFF;
  --color-border: #E5E5E5;
  
  /* Typography */
  --font-heading: 'Playfair Display', serif;
  --font-body: 'Lora', serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  
  /* Layout */
  --container-max: 1200px;
  --container-padding: 1.5rem;
  --section-padding: 4rem 0;
  
  /* Border & Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --border-width: 1px;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-white);
  overflow-x: hidden;
}

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

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

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

ul, ol {
  list-style: none;
}

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

h1 {
  font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-5xl));
}

h2 {
  font-size: clamp(var(--font-size-2xl), 4vw, var(--font-size-4xl));
}

h3 {
  font-size: clamp(var(--font-size-xl), 3vw, var(--font-size-3xl));
}

h4 {
  font-size: clamp(var(--font-size-lg), 2.5vw, var(--font-size-2xl));
}

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

/* ============================================
   LAYOUT UTILITIES
   ============================================ */

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  width: 100%;
}

.section {
  padding: var(--section-padding);
}

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

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

/* ============================================
   HEADER
   ============================================ */

.site-header {
  background-color: var(--color-white);
  border-bottom: var(--border-width) solid var(--color-border);
  padding: var(--space-md) 0;
  position: relative;
  z-index: 1000;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  position: relative;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-primary);
}

.nav-menu {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
}

.nav-link {
  font-size: var(--font-size-base);
  color: var(--color-text);
  padding: var(--space-xs) 0;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition-base);
}

.nav-link:hover::after {
  width: 100%;
}

/* Burger Menu */
.burger-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-xs);
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 100001;
  position: relative;
}

.burger-line {
  width: 25px;
  height: 2px;
  background-color: var(--color-primary);
  transition: all var(--transition-base);
}

.burger-toggle.active .burger-line:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

.burger-toggle.active .burger-line:nth-child(2) {
  opacity: 0;
}

.burger-toggle.active .burger-line:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-white);
  box-shadow: var(--shadow-lg);
  padding: calc(var(--space-xl) + 60px) var(--container-padding) var(--space-xl);
  z-index: 1000;
  overflow-y: auto;
}

.mobile-nav.active {
  display: block;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.mobile-nav-link {
  font-size: var(--font-size-base);
  color: var(--color-text);
  padding: var(--space-sm) 0;
  border-bottom: var(--border-width) solid var(--color-border);
}

/* ============================================
   HERO BANNER (Full Width)
   ============================================ */

.hero-banner {
  width: 100vw;
  position: relative;
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin-left: calc(-50vw + 50%);
  margin-right: calc(-50vw + 50%);
}

.hero-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    to bottom,
    rgba(27, 38, 59, 0.7) 0%,
    rgba(27, 38, 59, 0.5) 50%,
    rgba(27, 38, 59, 0.7) 100%
  );
  z-index: 2;
}

.hero-content {
  position: relative;
  z-index: 3;
  text-align: center;
  color: var(--color-white);
  padding: var(--space-xl) var(--container-padding);
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  color: var(--color-white);
  margin-bottom: var(--space-md);
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-text {
  font-size: var(--font-size-lg);
  color: var(--color-secondary);
  margin-bottom: var(--space-lg);
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

/* ============================================
   SECTION BANNERS
   ============================================ */

.section-banner {
  width: 100vw;
  position: relative;
  min-height: 40vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin: var(--space-2xl) calc(-50vw + 50%);
}

.section-banner-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}

.section-banner-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    to bottom,
    rgba(27, 38, 59, 0.75) 0%,
    rgba(27, 38, 59, 0.6) 50%,
    rgba(27, 38, 59, 0.75) 100%
  );
  z-index: 2;
}

.section-banner-content {
  position: relative;
  z-index: 3;
  text-align: center;
  color: var(--color-white);
  padding: var(--space-xl) var(--container-padding);
  max-width: 900px;
  margin: 0 auto;
}

.section-banner-title {
  color: var(--color-white);
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.section-banner-text {
  font-size: var(--font-size-lg);
  color: var(--color-secondary);
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

/* ============================================
   CONTENT SECTIONS
   ============================================ */

.content-section {
  padding: var(--space-3xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  font-style: italic;
  margin-top: var(--space-sm);
}

/* Grid Layouts */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-xl);
  max-width: 1000px;
  margin-left: auto;
  margin-right: auto;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

/* Card Components */
.card {
  background-color: var(--color-white);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-md);
}

.section-image {
  width: 100%;
  max-width: 400px;
  height: 250px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin: 0 auto var(--space-md);
  display: block;
}

.card-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-sm);
}

.card-text {
  font-size: var(--font-size-base);
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
}

/* Feature Items */
.feature-item {
  text-align: center;
  padding: var(--space-lg);
}

.feature-icon {
  font-size: var(--font-size-4xl);
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.feature-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-sm);
}

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

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-block;
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--font-size-base);
  font-family: var(--font-body);
  text-align: center;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  cursor: pointer;
  margin-top: 10px;
  border: 2px solid transparent;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-large {
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-lg);
}

.btn-full-width {
  width: 100%;
  margin-top: var(--space-md);
}

.text-max-width {
  max-width: 700px;
  margin: 0 auto var(--space-xl);
}

.text-max-width-center {
  max-width: 700px;
  margin: 0 auto var(--space-xl);
  text-align: center;
}

.margin-top-xl {
  margin-top: var(--space-2xl);
}

/* ============================================
   FORMS
   ============================================ */

.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: var(--font-size-base);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
  font-weight: 500;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-base);
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-white);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-base);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form-textarea {
  min-height: 150px;
  resize: vertical;
}

.form-checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.form-checkbox {
  width: 18px;
  height: 18px;
  margin-top: 3px;
  flex-shrink: 0;
  cursor: pointer;
}

.form-checkbox-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: 1.5;
}

/* ============================================
   PRODUCTS
   ============================================ */

.product-card {
  background-color: var(--color-white);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-align: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.product-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.product-image {
  width: 100%;
  height: 250px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-md);
}

.product-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-sm);
}

.product-description {
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
  font-size: var(--font-size-base);
}

.product-price {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--color-accent);
  font-family: var(--font-heading);
}

/* ============================================
   PORTFOLIO GALLERY
   ============================================ */

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.portfolio-item {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  aspect-ratio: 4 / 3;
}

.portfolio-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.portfolio-item:hover .portfolio-image {
  transform: scale(1.05);
}

.portfolio-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(27, 38, 59, 0.9), transparent);
  padding: var(--space-md);
  color: var(--color-white);
  transform: translateY(100%);
  transition: transform var(--transition-base);
}

.portfolio-item:hover .portfolio-overlay {
  transform: translateY(0);
}

.portfolio-title {
  font-size: var(--font-size-lg);
  color: var(--color-white);
  margin-bottom: var(--space-xs);
}

/* ============================================
   MAPS
   ============================================ */

.map-container {
  width: 100%;
  height: 400px;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-top: var(--space-xl);
  border: var(--border-width) solid var(--color-border);
}

.map-iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* ============================================
   FOOTER
   ============================================ */

.site-footer {
  background-color: var(--color-primary);
  color: var(--color-secondary);
  padding: var(--space-xl) 0 var(--space-md);
  margin-top: var(--space-3xl);
}

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

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.footer-section-title {
  font-size: var(--font-size-lg);
  color: var(--color-white);
  margin-bottom: var(--space-md);
  font-family: var(--font-heading);
}

.footer-link {
  display: block;
  color: var(--color-secondary);
  margin-bottom: var(--space-sm);
  font-size: var(--font-size-sm);
}

.footer-link:hover {
  color: var(--color-white);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-md);
  border-top: var(--border-width) solid rgba(245, 235, 224, 0.2);
  font-size: var(--font-size-sm);
  color: var(--color-secondary);
}

/* ============================================
   PRIVACY POPUP
   ============================================ */

.privacy-popup {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  z-index: 10000;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
}

.privacy-popup.active {
  display: flex;
}

.popup-content {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  max-width: 600px;
  max-height: 80vh;
  overflow-y: auto;
  position: relative;
  box-shadow: var(--shadow-lg);
}

.popup-close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  font-size: var(--font-size-2xl);
  color: var(--color-text);
  cursor: pointer;
  background: none;
  border: none;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-base);
}

.popup-close:hover {
  background-color: var(--color-border);
}

.popup-title {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-md);
  color: var(--color-primary);
}

.popup-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.popup-buttons {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

/* ============================================
   UTILITY PAGES
   ============================================ */

.utility-page {
  padding: var(--space-3xl) 0;
  max-width: 800px;
  margin: 0 auto;
}

.utility-title {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-lg);
  text-align: center;
}

.utility-content {
  background-color: var(--color-white);
  padding: var(--space-xl);
  border-radius: var(--radius-md);
  border: var(--border-width) solid var(--color-border);
}

.utility-section {
  margin-bottom: var(--space-xl);
}

.utility-section-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-md);
  color: var(--color-primary);
}

.utility-text {
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.utility-list {
  list-style: disc;
  margin-left: var(--space-lg);
  margin-bottom: var(--space-md);
}

.utility-list-item {
  color: var(--color-text-light);
  margin-bottom: var(--space-xs);
}

.date {
  font-style: italic;
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
  margin-top: var(--space-lg);
  text-align: center;
}

/* ============================================
   THANK YOU PAGE
   ============================================ */

.thank-you-section {
  text-align: center;
  padding: var(--space-3xl) 0;
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.thank-you-content {
  max-width: 600px;
  margin: 0 auto;
}

.thank-you-icon {
  font-size: 4rem;
  color: var(--color-accent);
  margin-bottom: var(--space-lg);
}

.thank-you-title {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-md);
}

.thank-you-text {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  margin-bottom: var(--space-xl);
}

/* ============================================
   404 PAGE
   ============================================ */

.error-section {
  text-align: center;
  padding: var(--space-3xl) 0;
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.error-content {
  max-width: 600px;
  margin: 0 auto;
}

.error-code {
  font-size: 6rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
  font-family: var(--font-heading);
}

.error-title {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-md);
}

.error-text {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  margin-bottom: var(--space-xl);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (min-width: 1024px) {
  .burger-toggle {
    display: none;
  }
  
  .mobile-nav {
    display: none !important;
  }
}

@media (max-width: 1023px) {
  .nav-menu {
    display: none;
  }
  
  .hero-banner {
    min-height: 50vh;
  }
  
  .section-banner {
    min-height: 35vh;
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .portfolio-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 3rem 0;
    --container-padding: 1rem;
  }
  
  .hero-content,
  .section-banner-content {
    padding: var(--space-lg) var(--container-padding);
  }
  
  .content-section {
    padding: var(--space-2xl) 0;
  }
  
  .section-header {
    margin-bottom: var(--space-xl);
  }
  
  .card,
  .product-card {
    padding: var(--space-md);
  }
  
  .popup-content {
    padding: var(--space-lg);
    max-width: 90%;
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-base: 0.9375rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
  }
  
  .brand-name {
    font-size: var(--font-size-lg);
  }
  
  .hero-banner {
    min-height: 40vh;
  }
  
  .section-banner {
    min-height: 30vh;
  }
  
  .btn {
    width: 100%;
    padding: var(--space-md);
  }
  
  .map-container {
    height: 300px;
  }
}

@media (max-width: 320px) {
  :root {
    --container-padding: 0.75rem;
    --space-md: 1rem;
  }
  
  .hero-content,
  .section-banner-content {
    padding: var(--space-md) var(--container-padding);
  }
}