/* ----------------------------------------------------
   Ustalar Brand - Modern Light Design System
   Resembles Ustalar Yapı Katalog structure with a clean, light aesthetic
---------------------------------------------------- */

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;900&family=JetBrains+Mono:wght@400;500;700&display=swap');

/* Design Tokens & CSS Variables */
:root {
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Colors (Light Theme Setup) */
  --bg-main: #f8fafc; /* Slate 50 */
  --bg-card: #ffffff; /* White */
  --bg-card-hover: #f1f5f9; /* Slate 100 */
  --border-color: rgba(15, 23, 42, 0.06);
  --border-hover: rgba(15, 23, 42, 0.12);
  
  --primary: #f97316; /* Ustalar Brand Orange */
  --primary-hover: #ea580c; /* Deep Orange */
  --primary-glow: rgba(249, 115, 22, 0.08);
  --primary-glow-hover: rgba(249, 115, 22, 0.2);
  
  --text-main: #334155; /* Slate 700 */
  --text-white: #0f172a; /* Slate 900 */
  --text-muted: #64748b; /* Slate 500 */
  --text-light: #ffffff; /* For overlays/dark areas */
  --text-dark: #0f172a;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Reset and Core Layout */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

::selection {
  background-color: var(--primary);
  color: #fff;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-main);
}
::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

button, a {
  font-family: inherit;
  outline: none;
}

/* ---------------- PRELOADER ---------------- */
.preloader-overlay {
  position: fixed;
  inset: 0;
  background-color: #ffffff;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 1;
  transition: opacity 0.5s ease-in-out, visibility 0.5s ease-in-out;
}

.preloader-overlay.fade-out {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.preloader-content {
  position: relative;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.preloader-glow {
  position: absolute;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(249, 115, 22, 0.15) 0%, rgba(255, 255, 255, 0) 70%);
  filter: blur(10px);
  animation: pulseGlow 2.5s infinite ease-in-out;
  z-index: 1;
}

.preloader-icon-wrapper {
  position: relative;
  z-index: 2;
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #fff 0%, #f8fafc 100%);
  border-radius: 24px;
  border: 1px solid var(--border-color);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
  margin-bottom: 1.5rem;
}

.preloader-icon-svg {
  width: 42px;
  height: 42px;
  color: var(--primary);
}

.preloader-title {
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--text-white);
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.preloader-accent {
  color: var(--primary);
}

.preloader-subtitle {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
}

.preloader-spinner-container {
  margin-top: 2rem;
  position: relative;
  width: 24px;
  height: 24px;
}

.preloader-spinner {
  width: 100%;
  height: 100%;
  border: 2px solid rgba(249, 115, 22, 0.1);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes pulseGlow {
  0%, 100% { transform: scale(0.9); opacity: 0.6; }
  50% { transform: scale(1.1); opacity: 1; }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ---------------- HEADER ---------------- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: rgba(255, 255, 255, 0.8);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background-color var(--transition-normal);
}

.header-container {
  display: flex;
  height: 4.5rem;
  align-items: center;
  justify-content: space-between;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: inherit;
}

.logo-icon {
  display: flex;
  height: 2.5rem;
  width: 2.5rem;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background-color: var(--primary);
  color: #ffffff;
  font-weight: 900;
  transition: transform var(--transition-fast), background-color var(--transition-fast);
}

.logo-container:hover .logo-icon {
  transform: scale(1.05);
  background-color: var(--primary-hover);
}

.logo-text {
  font-size: 1rem;
  font-weight: 900;
  color: var(--text-white);
  text-transform: uppercase;
  letter-spacing: -0.025em;
}

.logo-accent {
  color: var(--primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border-radius: 12px;
  background-color: var(--primary);
  color: #ffffff;
  padding: 0.625rem 1.25rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-decoration: none;
  transition: all var(--transition-normal);
  box-shadow: 0 4px 6px -1px rgba(249, 115, 22, 0.15), 0 2px 4px -1px rgba(249, 115, 22, 0.1);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  box-shadow: 0 10px 15px -3px var(--primary-glow-hover), 0 4px 6px -2px var(--primary-glow-hover);
}

.btn-primary svg {
  width: 1rem;
  height: 1rem;
  stroke-width: 2.5;
}

.btn-back {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  text-decoration: none;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  transition: all var(--transition-fast);
}

.btn-back:hover {
  color: var(--text-white);
  background-color: var(--bg-card-hover);
}

.btn-back svg {
  width: 0.875rem;
  height: 0.875rem;
}

/* ---------------- HERO SECTION ---------------- */
.hero-wrapper {
  position: relative;
  height: 380px;
  width: 100%;
  overflow: hidden;
  background-color: #0f172a;
}

.hero-image-mask {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, var(--bg-main) 0%, rgba(15, 23, 42, 0.6) 60%, rgba(15, 23, 42, 0.8) 100%);
  z-index: 2;
}

.hero-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: brightness(0.7);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 10;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-box {
  max-width: 700px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  border-radius: 6px;
  background-color: var(--primary);
  color: #ffffff;
  padding: 0.35rem 0.75rem;
  font-size: 0.6875rem;
  font-family: var(--font-mono);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  width: fit-content;
  margin-bottom: 1rem;
}

.hero-badge svg {
  width: 0.875rem;
  height: 0.875rem;
}

.hero-title {
  font-size: 2rem;
  font-weight: 900;
  color: #ffffff;
  line-height: 1.15;
  letter-spacing: -0.02em;
  text-transform: uppercase;
}

@media (min-width: 640px) {
  .hero-title { font-size: 2.5rem; }
}
@media (min-width: 768px) {
  .hero-title { font-size: 3rem; }
}

.hero-desc {
  margin-top: 1rem;
  color: #e2e8f0;
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ---------------- SERVICES SECTION ---------------- */
.section-wrapper {
  padding: 4rem 0;
}

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-title {
  font-size: 1.875rem;
  font-weight: 900;
  color: var(--text-white);
  text-transform: uppercase;
  letter-spacing: -0.01em;
}

.section-title-accent {
  color: var(--primary);
}

.section-desc {
  max-width: 42rem;
  margin: 0.75rem auto 0;
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Services Grid & Card Buttons */
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

@media (min-width: 640px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Card Button Style */
.service-btn {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  width: 100%;
  aspect-ratio: 1.5 / 1;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  text-decoration: none;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.02), 0 2px 4px -1px rgba(0, 0, 0, 0.01);
  cursor: pointer;
}

.service-btn-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transition: transform var(--transition-slow) cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 1;
}

.service-btn-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(15, 23, 42, 0.9) 0%, rgba(15, 23, 42, 0.35) 60%, rgba(249, 115, 22, 0.1) 100%);
  transition: background var(--transition-normal);
  z-index: 2;
}

.service-btn-content {
  position: relative;
  z-index: 3;
  padding: 1.5rem;
  width: 100%;
  color: var(--text-light);
}

.service-btn-title {
  font-size: 1.125rem;
  font-weight: 800;
  line-height: 1.25;
  color: #ffffff;
  text-shadow: 0 1px 3px rgba(0,0,0,0.3);
  text-transform: uppercase;
  margin-bottom: 0.375rem;
  transition: color var(--transition-fast);
}

.service-btn-desc {
  font-size: 0.75rem;
  color: #cbd5e1;
  line-height: 1.4;
  margin-bottom: 0.75rem;
  opacity: 0.95;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.service-btn-action {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.6875rem;
  font-weight: 800;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  opacity: 0.85;
  transform: translateX(0);
  transition: transform var(--transition-normal), color var(--transition-normal), opacity var(--transition-normal);
}

.service-btn-action svg {
  width: 0.875rem;
  height: 0.875rem;
}

/* Card Button Hover Effects */
.service-btn:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
  box-shadow: 0 12px 25px -8px var(--primary-glow-hover), 0 8px 16px -6px rgba(15, 23, 42, 0.15);
}

.service-btn:hover .service-btn-bg {
  transform: scale(1.08);
}

.service-btn:hover .service-btn-overlay {
  background: linear-gradient(to top, rgba(234, 88, 12, 0.92) 0%, rgba(15, 23, 42, 0.5) 60%, rgba(249, 115, 22, 0.25) 100%);
}

.service-btn:hover .service-btn-title {
  color: #ffffff;
}

.service-btn:hover .service-btn-action {
  opacity: 1;
  color: #ffffff;
  transform: translateX(4px);
}

/* Dynamic State Messages (Loading/No Data) */
.loading-box, .no-data-box {
  grid-column: 1 / -1;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 18px;
  padding: 4rem 2rem;
  text-align: center;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.02);
}

.loading-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid rgba(249, 115, 22, 0.1);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 1rem;
}

.loading-text, .no-data-text {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
}

.no-data-box svg {
  width: 3rem;
  height: 3rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  opacity: 0.6;
}

/* ---------------- CORPORATE VALUES (WHY CHOOSE US) ---------------- */
.values-section {
  background-color: #ffffff;
  padding: 4.5rem 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.values-title-pre {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0.12em;
  margin-bottom: 0.5rem;
}

.values-title {
  text-align: center;
  font-size: 1.75rem;
  font-weight: 900;
  color: var(--text-white);
  text-transform: uppercase;
  margin-bottom: 3rem;
}

.values-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .values-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.value-card {
  padding: 1.5rem;
  border-radius: 16px;
  background-color: var(--bg-main);
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.value-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-hover);
  background-color: #ffffff;
  box-shadow: 0 10px 20px -10px rgba(0, 0, 0, 0.05);
}

.value-icon {
  display: flex;
  height: 3rem;
  width: 3rem;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background-color: var(--primary-glow);
  color: var(--primary);
  margin-bottom: 1.25rem;
  transition: all var(--transition-normal);
}

.value-card:hover .value-icon {
  background-color: var(--primary);
  color: #ffffff;
}

.value-icon svg {
  width: 1.5rem;
  height: 1.5rem;
  stroke-width: 2;
}

.value-name {
  font-size: 1rem;
  font-weight: 800;
  color: var(--text-white);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

.value-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ---------------- FOOTER ---------------- */
.app-footer {
  margin-top: auto;
  background-color: #0f172a;
  color: #94a3b8;
  padding: 4rem 0 2rem;
  border-top: 1px solid rgba(255,255,255,0.05);
}

.footer-top {
  display: grid;
  gap: 2.5rem;
  grid-template-columns: 1fr;
  margin-bottom: 3rem;
}

@media (min-width: 768px) {
  .footer-top {
    grid-template-columns: repeat(3, 1fr);
  }
}

.footer-col {
  display: flex;
  flex-direction: column;
}

.footer-logo-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: #e2e8f0;
  font-size: 0.75rem;
  font-weight: 600;
  margin-top: 1rem;
  margin-bottom: 1rem;
  width: fit-content;
}

.footer-partner-logo {
  height: 1.5rem;
  width: auto;
  object-contain: fit;
}

.footer-desc {
  font-size: 0.8125rem;
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.footer-stars {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-bottom: 1.25rem;
}

.footer-stars svg {
  width: 0.875rem;
  height: 0.875rem;
  fill: #eab308;
  color: #eab308;
}

.footer-star-text {
  font-size: 0.75rem;
  font-weight: 700;
  color: #cbd5e1;
  margin-left: 0.25rem;
}

.footer-app-badges {
  margin-top: 0.5rem;
}

.btn-google-play {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  background-color: #1e293b;
  border: 1px solid rgba(255,255,255,0.1);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  text-decoration: none;
  color: #ffffff;
  transition: background-color var(--transition-fast);
}

.btn-google-play:hover {
  background-color: #334155;
}

.google-play-icon {
  height: 1.25rem;
  width: auto;
}

.play-text {
  display: flex;
  flex-direction: column;
  text-align: left;
}

.play-subtitle {
  font-size: 0.5rem;
  letter-spacing: 0.05em;
  color: #94a3b8;
}

.play-title {
  font-size: 0.75rem;
  font-weight: 700;
}

.footer-title {
  font-size: 0.875rem;
  font-weight: 800;
  color: #ffffff;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
  letter-spacing: 0.05em;
}

.footer-contacts {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

.footer-contacts li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.8125rem;
}

.footer-contacts li svg {
  width: 1rem;
  height: 1rem;
  color: var(--primary);
  flex-shrink: 0;
  margin-top: 0.125rem;
}

.footer-form-text {
  font-size: 0.8125rem;
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.btn-footer-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  border-radius: 10px;
  background-color: var(--primary);
  color: #ffffff;
  padding: 0.75rem 1rem;
  font-size: 0.8125rem;
  font-weight: 700;
  text-decoration: none;
  text-align: center;
  transition: background-color var(--transition-fast);
  box-shadow: 0 4px 6px -1px rgba(249, 115, 22, 0.1);
}

.btn-footer-submit:hover {
  background-color: var(--primary-hover);
}

.btn-footer-submit svg {
  width: 0.875rem;
  height: 0.875rem;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.05);
  padding-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
}

@media (min-width: 640px) {
  .footer-bottom {
    flex-direction: row;
  }
}

.footer-links a {
  color: #94a3b8;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: #ffffff;
}

/* ---------------- VIDEO PLAYER & PLAY BUTTON ---------------- */
.service-play-btn {
  position: absolute;
  bottom: 1.25rem;
  right: 1.25rem;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  background-color: var(--primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 10px rgba(249, 115, 22, 0.3);
  cursor: pointer;
  z-index: 10;
  transition: transform var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
}

.service-play-btn:hover {
  background-color: var(--primary-hover);
  transform: scale(1.1);
  box-shadow: 0 6px 14px rgba(249, 115, 22, 0.4);
}

.service-play-btn svg {
  width: 1.125rem;
  height: 1.125rem;
  fill: currentColor;
  margin-left: 0.125rem;
}

.video-overlay {
  position: fixed;
  inset: 0;
  z-index: 150;
  background-color: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  animation: fadeIn var(--transition-fast) forwards;
}

.video-modal-content {
  position: relative;
  width: 100%;
  max-width: 850px;
  aspect-ratio: 16 / 9;
  background-color: #000000;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.video-iframe-container {
  width: 100%;
  height: 100%;
}

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

.video-close-btn {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  background-color: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 160;
  transition: all var(--transition-fast);
}

.video-close-btn:hover {
  background-color: var(--primary);
  border-color: var(--primary);
  transform: rotate(90deg);
}

.video-close-btn svg {
  width: 1.25rem;
  height: 1.25rem;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}