:root {
  --bg-dark: #070f0c;
  --bg-card: #0f1c16;
  --bg-green-deep: #052e16;
  --bg-green-mid: #0a3d25;
  --bg-green-light: #166534;
  --text-primary: #fdf8ea;
  --text-secondary: #a3b899;
  --text-dark: #0f1c16;
  --accent-yellow: #f5ce38;
  --accent-pink: #ff2b85;
  --border-color: rgba(245, 206, 56, 0.15);
  --border-active: #f5ce38;
  --input-bg: #09130e;
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.6);
  --shadow-sm: 0 4px 10px rgba(0, 0, 0, 0.3);
  --font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

body {
  background: radial-gradient(circle at center, rgba(10, 61, 37, 0.7) 0%, var(--bg-dark) 100%), url('../images/Goa.png') no-repeat center fixed;
  background-size: cover;
  color: var(--text-primary);
  font-family: var(--font-family);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 40px 20px;
}

header {
  text-align: center;
  margin-bottom: 30px;
}

header h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  color: var(--accent-yellow);
  letter-spacing: 2px;
  text-transform: uppercase;
  text-shadow: 0 4px 12px rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

header p {
  color: var(--text-secondary);
  margin-top: 8px;
  font-size: clamp(0.9rem, 2vw, 1.1rem);
  font-weight: 500;
  text-shadow: 0 2px 5px rgba(0, 0, 0, 0.5);
}

.app-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  width: 100%;
  max-width: 950px;
  min-height: 580px;
  padding: 30px;
  box-shadow: var(--shadow-lg);
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 30px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

@media (max-width: 868px) {
  body {
    padding: 20px 10px;
  }
  .app-container {
    grid-template-columns: 1fr;
    padding: 20px;
    gap: 24px;
  }
}

.controls-section {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: 20px;
}

.tabs {
  display: flex;
  background: var(--input-bg);
  padding: 6px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.tab-btn {
  flex: 1;
  padding: 12px 8px;
  border: none;
  background: transparent;
  font-family: var(--font-family);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: 8px;
  transition: all 0.3s ease;
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  background: var(--bg-green-deep);
  color: var(--accent-yellow);
  box-shadow: var(--shadow-sm);
}

.file-drop {
  border: 2px dashed var(--border-color);
  background: var(--input-bg);
  padding: 24px;
  border-radius: 14px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.file-drop:hover, .file-drop.dragover {
  border-color: var(--border-active);
  background: rgba(10, 61, 37, 0.2);
  transform: translateY(-2px);
}

.file-drop svg {
  width: 32px;
  height: 32px;
  fill: var(--text-secondary);
  transition: fill 0.3s ease;
}

.file-drop:hover svg {
  fill: var(--accent-yellow);
}

.file-drop strong {
  font-size: 1rem;
  color: var(--text-primary);
}

.file-drop p {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.file-drop input {
  display: none;
}

.adjust-group {
  background: var(--input-bg);
  border: 1px solid var(--border-color);
  padding: 16px;
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.adjust-group h3 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-yellow);
  display: flex;
  align-items: center;
  gap: 6px;
}

.slider-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.slider-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.slider-container {
  display: flex;
  align-items: center;
  gap: 10px;
}

.slider-container input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: 3px;
  background: var(--bg-green-deep);
  outline: none;
  transition: opacity 0.2s;
}

.slider-container input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-yellow);
  cursor: pointer;
  transition: transform 0.1s;
}

.slider-container input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.25);
}

.slider-container input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border: none;
  border-radius: 50%;
  background: var(--accent-yellow);
  cursor: pointer;
  transition: transform 0.1s;
}

.slider-container input[type="range"]::-moz-range-thumb:hover {
  transform: scale(1.25);
}

.btn-reset {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-family: var(--font-family);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  align-self: flex-end;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: all 0.2s ease;
}

.btn-reset:hover {
  border-color: var(--accent-yellow);
  color: var(--accent-yellow);
}

.form-group {
  margin-bottom: 12px;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
}

.form-group input {
  width: 100%;
  padding: 12px 14px;
  background: var(--input-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  font-family: var(--font-family);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: all 0.3s ease;
}

.form-group input:focus {
  border-color: var(--border-active);
  box-shadow: 0 0 0 2px rgba(245, 206, 56, 0.15);
}

.preview-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--input-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 20px;
  width: 100%;
  position: relative;
}

.canvas-wrapper {
  position: relative;
  width: 100%;
  max-width: 380px;
  margin-bottom: 16px;
  aspect-ratio: 1/1;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
  cursor: grab;
}

.canvas-wrapper:active {
  cursor: grabbing;
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.drag-hint {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.7);
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.7rem;
  color: #fff;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.canvas-wrapper:hover .drag-hint.has-photo {
  opacity: 0.8;
}

.actions {
  display: flex;
  gap: 12px;
  width: 100%;
}

.btn {
  flex: 1;
  padding: 14px;
  border: none;
  border-radius: 10px;
  font-family: var(--font-family);
  font-weight: 800;
  font-size: 0.9rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.3s ease;
  text-decoration: none;
}

.btn:active {
  transform: scale(0.98);
}

.btn-download {
  background: var(--accent-yellow);
  color: var(--text-dark);
  box-shadow: 0 4px 14px rgba(245, 206, 56, 0.3);
}

.btn-download:hover {
  background: #ecd41e;
  box-shadow: 0 6px 20px rgba(245, 206, 56, 0.4);
}

.btn-share {
  background: var(--accent-pink);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(255, 43, 133, 0.3);
}

.btn-share:hover {
  background: #e61d74;
  box-shadow: 0 6px 20px rgba(255, 43, 133, 0.4);
}

.btn svg {
  width: 18px;
  height: 18px;
}

.status-msg {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(15, 28, 22, 0.95);
  border: 1px solid var(--accent-yellow);
  padding: 16px 24px;
  border-radius: 12px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent-yellow);
  z-index: 10;
  display: none;
  box-shadow: var(--shadow-lg);
  align-items: center;
  gap: 10px;
}

footer {
  margin-top: 40px;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

footer a {
  color: var(--accent-yellow);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s;
}

footer a:hover {
  color: #fff;
}

/* Spinner Animation */
.spinner {
  width: 20px;
  height: 20px;
  border: 3px solid rgba(245, 206, 56, 0.3);
  border-top-color: var(--accent-yellow);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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