/* ============================================
   CSS Variables - Cute Pastel Theme
   ============================================ */
:root {
  --color-pink-light: #FFE4E6;
  --color-pink: #FFB3BA;
  --color-pink-medium: #FF9FA8;
  --color-pink-dark: #FF8A95;
  --color-lavender: #E6D9FF;
  --color-peach: #FFE5CC;
  --color-white: #FFFFFF;
  --color-gray-light: #F8F8F8;
  --color-gray: #888888;
  --color-gray-dark: #555555;
  
  --shadow-soft: 0 4px 20px rgba(255, 182, 193, 0.15);
  --shadow-medium: 0 6px 30px rgba(255, 182, 193, 0.2);
  --shadow-strong: 0 8px 40px rgba(255, 182, 193, 0.25);
  
  --border-radius-small: 12px;
  --border-radius-medium: 20px;
  --border-radius-large: 30px;
  
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;
  
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background: linear-gradient(135deg, var(--color-pink-light) 0%, var(--color-lavender) 100%);
  min-height: 100vh;
  color: var(--color-gray-dark);
  line-height: 1.6;
}

/* ============================================
   Container & Layout
   ============================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-md);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ============================================
   Header
   ============================================ */
.header {
  text-align: center;
  padding: var(--spacing-lg) 0;
  margin-bottom: var(--spacing-lg);
}

.title {
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--color-pink-dark);
  margin-bottom: var(--spacing-sm);
  text-shadow: 0 2px 10px rgba(255, 138, 149, 0.2);
  animation: fadeInDown 0.6s ease-out;
}

.subtitle {
  font-size: 1.1rem;
  color: var(--color-gray);
  animation: fadeInDown 0.6s ease-out 0.1s both;
}

/* ============================================
   Main Content
   ============================================ */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
  align-items: center;
}

/* ============================================
   Image Container
   ============================================ */
.image-container {
  width: 100%;
  max-width: 800px;
  min-height: 400px;
  background: var(--color-white);
  border-radius: var(--border-radius-large);
  box-shadow: var(--shadow-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: var(--spacing-md);
  animation: fadeInUp 0.6s ease-out 0.2s both;
}

.image-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 400px;
}

.placeholder-content {
  text-align: center;
  color: var(--color-gray);
}

.placeholder-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
  animation: float 3s ease-in-out infinite;
}

.placeholder-text {
  font-size: 1.2rem;
  color: var(--color-gray);
}

.display-image {
  max-width: 100%;
  max-height: 600px;
  height: auto;
  width: auto;
  object-fit: contain;
  border-radius: var(--border-radius-medium);
  box-shadow: var(--shadow-soft);
  animation: imageFadeIn 0.8s ease-out, imageScale 0.8s ease-out;
}

.image-loading {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: var(--color-gray);
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid var(--color-pink-light);
  border-top-color: var(--color-pink-medium);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--spacing-md);
}

.loading-text {
  font-size: 1rem;
  color: var(--color-gray);
}

/* ============================================
   Input Section
   ============================================ */
.input-section {
  width: 100%;
  max-width: 600px;
  animation: fadeInUp 0.6s ease-out 0.3s both;
}

.image-form {
  background: var(--color-white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-large);
  box-shadow: var(--shadow-soft);
}

.input-group {
  margin-bottom: var(--spacing-lg);
}

.input-label {
  display: block;
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-pink-dark);
  margin-bottom: var(--spacing-xs);
}

.input-field {
  width: 100%;
  padding: 1rem 1.25rem;
  font-size: 1rem;
  border: 2px solid var(--color-pink-light);
  border-radius: var(--border-radius-medium);
  background: var(--color-white);
  color: var(--color-gray-dark);
  transition: var(--transition-smooth);
  outline: none;
}

.input-field:focus {
  border-color: var(--color-pink-medium);
  box-shadow: 0 0 0 4px rgba(255, 159, 168, 0.1);
}

.input-field::placeholder {
  color: var(--color-gray);
  opacity: 0.6;
}

.helper-text {
  font-size: 0.9rem;
  color: var(--color-gray);
  margin-top: var(--spacing-xs);
  padding-left: 0.25rem;
}

/* ============================================
   Submit Button
   ============================================ */
.submit-button {
  width: 100%;
  padding: 1.25rem 2rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-white);
  background: linear-gradient(135deg, var(--color-pink-medium) 0%, var(--color-pink-dark) 100%);
  border: none;
  border-radius: var(--border-radius-medium);
  cursor: pointer;
  transition: var(--transition-bounce);
  box-shadow: var(--shadow-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
}

.submit-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
}

.submit-button:active {
  transform: translateY(0);
  box-shadow: var(--shadow-soft);
}

.submit-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.button-icon {
  font-size: 1.2rem;
  animation: heartBeat 1.5s ease-in-out infinite;
}

/* ============================================
   Message Display
   ============================================ */
.message {
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: var(--border-radius-medium);
  text-align: center;
  font-size: 1rem;
  animation: fadeInUp 0.4s ease-out;
}

.message.success {
  background: rgba(255, 182, 186, 0.2);
  color: var(--color-pink-dark);
  border: 2px solid var(--color-pink-light);
}

.message.error {
  background: rgba(255, 138, 149, 0.15);
  color: #d32f2f;
  border: 2px solid rgba(255, 138, 149, 0.3);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  text-align: center;
  padding: var(--spacing-lg) 0;
  margin-top: var(--spacing-xl);
  color: var(--color-gray);
  font-size: 0.9rem;
  animation: fadeIn 0.6s ease-out 0.4s both;
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes imageScale {
  from {
    transform: scale(0.95);
  }
  to {
    transform: scale(1);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

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

@keyframes heartBeat {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.2);
  }
}

/* ============================================
   Responsive Design - Mobile
   ============================================ */
@media (max-width: 768px) {
  .container {
    padding: var(--spacing-sm);
  }

  .title {
    font-size: 2rem;
  }

  .subtitle {
    font-size: 1rem;
  }

  .image-container {
    min-height: 300px;
    padding: var(--spacing-sm);
  }

  .placeholder-icon {
    font-size: 3rem;
  }

  .placeholder-text {
    font-size: 1rem;
  }

  .image-form {
    padding: var(--spacing-lg);
  }

  .input-field {
    padding: 1.25rem 1.5rem;
    font-size: 1.1rem;
  }

  .submit-button {
    padding: 1.5rem 2rem;
    font-size: 1.2rem;
  }

  .helper-text {
    font-size: 1rem;
  }

  .display-image {
    max-height: 400px;
  }

  .main-content {
    gap: var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  .title {
    font-size: 1.75rem;
  }

  .image-container {
    min-height: 250px;
    border-radius: var(--border-radius-medium);
  }

  .image-form {
    padding: var(--spacing-md);
    border-radius: var(--border-radius-medium);
  }

  .input-field {
    padding: 1.1rem 1.25rem;
  }

  .submit-button {
    padding: 1.3rem 1.5rem;
    font-size: 1.1rem;
  }
}