/* 
   Silia Stamatopoulou Studio
   Design System & Main Stylesheet
*/

:root {
  /* Color Palette - Neutral, Architectural, Timeless */
  --color-bg: #F9F9F7;
  /* Warm off-white/stone */
  --color-surface: #FFFFFF;
  /* Pure white */
  --color-text-main: #2C2C2C;
  /* Soft charcoal */
  --color-text-muted: #666666;
  /* Warm grey */
  --color-accent: #8E8E8E;
  /* Stone grey for lines/accents */
  --color-border: #E5E5E5;
  /* Light grey border */

  /* Typography */
  --font-heading: 'Cormorant Garamond', serif;
  /* Elegant, architectural */
  --font-body: 'Inter', sans-serif;
  /* Clean, technical */

  /* Spacing System */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 8rem;
  --space-2xl: 12rem;

  /* Grid & Layout */
  --container-width: 1400px;
  --grid-columns: 12;
  --border-radius: 0px;
  /* Sharp corners for architectural feel */

  /* Transitions */
  --transition-fast: 0.3s ease;
  --transition-smooth: 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

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

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

body {
  background-color: var(--color-bg);
  color: var(--color-text-main);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

p {
  font-weight: 300;
  max-width: 65ch;
}

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

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

/* Utility Classes */
.container {
  width: 90%;
  max-width: var(--container-width);
  margin: 0 auto;
}

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

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

.flex {
  display: flex;
  gap: var(--space-md);
}

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

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

.uppercase {
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.875rem;
}

/* Buttons & Links */
.btn {
  display: inline-block;
  padding: 1rem 2.5rem;
  background: transparent;
  border: 1px solid var(--color-text-main);
  color: var(--color-text-main);
  font-family: var(--font-body);
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  transition: var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.btn:hover {
  background: var(--color-text-main);
  color: var(--color-surface);
}

.link-underline {
  position: relative;
  display: inline-block;
  padding-bottom: 2px;
}

.link-underline::after {
  content: '';
  position: absolute;
  width: 100%;
  transform: scaleX(0);
  height: 1px;
  bottom: 0;
  left: 0;
  background-color: currentColor;
  transform-origin: bottom right;
  transition: transform 0.4s ease-out;
}

.link-underline:hover::after {
  transform: scaleX(1);
  transform-origin: bottom left;
}

/* Header & Navigation */
header {
  padding: var(--space-md) 0;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: rgba(249, 249, 247, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.875rem;
  font-family: var(--font-body);
  color: var(--color-text-muted);
  margin-right: var(--space-md);
  margin-left: auto;
  /* Push to right, before hamburger/menu */
}

.lang-btn {
  cursor: pointer;
  transition: color var(--transition-fast);
}

.lang-btn:hover {
  color: var(--color-text-main);
}

.lang-btn.active {
  color: var(--color-text-main);
  font-weight: 500;
  border-bottom: 1px solid var(--color-text-main);
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  font-weight: 400;
}

.nav-links {
  display: flex;
  gap: var(--space-md);
}

.nav-links a {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.nav-links a:hover {
  color: var(--color-text-main);
}

/* Hero Section */
.hero {
  height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 10;
  max-width: 800px;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  z-index: 1;
  opacity: 0.9;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, rgba(249, 249, 247, 0.85) 0%, rgba(249, 249, 247, 0.4) 100%);
  z-index: 2;
}

h1.hero-title {
  margin-bottom: var(--space-sm);
  color: var(--color-text-main);
}

p.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

/* About Section */
.about {
  background-color: var(--color-surface);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  align-items: center;
}

.about-image {
  position: relative;
}

.about-image img {
  width: auto;
  max-width: 100%;
  max-height: 500px;
  /* Constrain height to approximately 80% of typical portrait */
  object-fit: contain;
  display: block;
  margin: 0 auto;
}

.about-text h2 {
  margin-bottom: var(--space-md);
}

.about-text p {
  margin-bottom: var(--space-sm);
  color: var(--color-text-muted);
}

.credentials {
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
}

.credential-item {
  display: flex;
  gap: var(--space-xs);
  align-items: center;
  font-size: 0.875rem;
  color: var(--color-text-main);
  margin-bottom: var(--space-xs);
}

/* Services Grid */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.service-card {
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  transition: var(--transition-fast);
}

.service-card:hover {
  border-color: var(--color-text-main);
  transform: translateY(-5px);
}

.service-number {
  font-family: var(--font-heading);
  font-size: 2rem;
  color: var(--color-border);
  margin-bottom: var(--space-sm);
}

.service-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-xs);
}

.service-card p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* Project Grid */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.project-item {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4/3;
  cursor: pointer;
}

.project-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-smooth);
}

.project-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: var(--space-md);
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
  color: white;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.project-item:hover .project-img {
  transform: scale(1.05);
}

.project-item:hover .project-overlay {
  opacity: 1;
}

/* Process Section */
.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-lg);
  position: relative;
}

.process-steps::before {
  content: '';
  position: absolute;
  top: 20px;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--color-border);
  z-index: 0;
}

.step {
  position: relative;
  z-index: 1;
  background: var(--color-bg);
  padding-right: var(--space-sm);
  padding-left: var(--space-sm);
}

.step-marker {
  width: 10px;
  height: 10px;
  background: var(--color-text-main);
  margin-bottom: var(--space-md);
  margin-top: 15px;
  /* Alignment with line */
}

/* Contact Section */
.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.contact-info p {
  margin-bottom: var(--space-xs);
  color: var(--color-text-muted);
}

.contact-form {
  display: grid;
  gap: var(--space-sm);
}

input,
textarea,
select {
  width: 100%;
  padding: 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  font-family: var(--font-body);
  font-size: 1rem;
  transition: border-color var(--transition-fast);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-text-main);
}

input::placeholder,
textarea::placeholder {
  color: #757575; /* Standard placeholder gray to match */
  opacity: 1; /* Standardize cross-browser opacity */
}

select:invalid {
  color: #757575; /* Matches placeholder color */
}

select option {
  color: var(--color-text-main); /* Normal options stay standard text color */
}

/* Footer */
footer {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* Hamburger Menu */
.hamburger {
  display: none;
  cursor: pointer;
  z-index: 1000;
}

.hamburger span {
  display: block;
  width: 25px;
  height: 2px;
  background-color: var(--color-text-main);
  margin: 5px 0;
  transition: all 0.3s ease;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  :root {
    --space-xl: 4rem;
  }

  .hamburger {
    display: block;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    height: 100vh;
    width: 70%;
    background-color: var(--color-surface);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-lg);
    transform: translateX(100%);
    transition: transform 0.4s ease-in-out;
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.05);
  }

  .nav-links.active {
    transform: translateX(0);
  }

  .nav-links a {
    font-size: 1.25rem;
  }

  /* Hamburger Animation */
  .hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .hamburger.active span:nth-child(2) {
    opacity: 0;
  }

  .hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .about-grid,
  .contact-container,
  .portfolio-grid {
    grid-template-columns: 1fr;
  }

  .process-steps {
    grid-template-columns: 1fr;
  }

  .process-steps::before {
    width: 1px;
    height: 100%;
    left: 4px;
    top: 0;
  }

  .step-marker {
    margin-top: 0;
    margin-right: var(--space-sm);
  }

  .hero-content {
    padding: var(--space-md);
  }

  .about-image {
    display: none;
  }
}

/* Project Detail Page */
.project-hero {
  position: relative;
  height: 75vh;
  min-height: 500px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 0;
}

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

.project-hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.4);
  z-index: 2;
}

.project-hero-content {
  position: relative;
  z-index: 3;
  color: white;
  text-align: center;
  margin-top: var(--space-lg);
}

.project-hero-content span {
  display: block;
  margin-bottom: var(--space-sm);
  font-size: 0.875rem;
  letter-spacing: 0.1em;
  opacity: 0.9;
  text-transform: uppercase;
}

.project-hero-content h1 {
  font-size: clamp(3rem, 6vw, 5rem);
  margin-bottom: 0;
}

.project-detail-grid {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: var(--space-2xl);
  align-items: start;
}

.project-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  border-top: 1px solid var(--color-text-main);
  padding-top: var(--space-sm);
  position: sticky;
  top: 100px;
}

.info-item h4 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.info-item p {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-text-main);
}

.project-desc h2 {
  font-size: 2rem;
  margin-bottom: var(--space-md);
  line-height: 1.3;
}

.rich-text p {
  margin-bottom: var(--space-md);
  font-size: 1.125rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.gallery-grid img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  aspect-ratio: 4/3;
  transition: opacity var(--transition-fast);
}

/* Make every 3rd image span full width for variety */
.gallery-grid img:nth-child(3n) {
  grid-column: span 2;
  aspect-ratio: 21/9;
}

@media (max-width: 900px) {
  .project-detail-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .project-info {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: space-between;
    border-top: none;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--space-md);
  }

  .gallery-grid {
    grid-template-columns: 1fr;
  }

  .gallery-grid img:nth-child(3n) {
    grid-column: span 1;
    aspect-ratio: 4/3;
  }
}