/* ======================================= */
/* BASE64 ENCODER & DECODER - MODERN UNIFIED */
/* ======================================= */

/* ===== COLOR DEFINITIONS ===== */
/* Dark mode is default, light mode overrides via :root.light-mode */

.base64-card-content {
  /* Dark mode colors */
  --base64-bg-card: var(--secondary-bg);
  --base64-bg-input: var(--primary-bg);
  --base64-bg-form: var(--secondary-bg);
  --base64-border: var(--border-color);
  --base64-text: var(--text-primary);
  --base64-text-secondary: var(--text-secondary);
  --base64-button-bg: var(--link-color);
  --base64-button-text: var(--text-primary);
  --base64-button-border: var(--border-color);
  --base64-button-hover-border: var(--link-color);
  --base64-button-hover-shadow: rgba(88, 166, 255, 0.2);
  --base64-primary-btn-bg: var(--link-color);
  --base64-primary-btn-border: var(--link-color);
  --base64-primary-btn-shadow: rgba(88, 166, 255, 0.3);
  --base64-secondary-btn-bg: #6b7280;
  --base64-secondary-btn-border: #6b7280;
  --base64-secondary-btn-shadow: rgba(107, 114, 128, 0.3);
  --base64-copy-btn-bg: var(--button-primary-bg);
  --base64-copy-btn-border: var(--button-primary-bg);
  --base64-copy-btn-shadow: rgba(35, 134, 54, 0.3);
  --base64-focus-border: var(--link-color);
  --base64-focus-shadow: rgba(88, 166, 255, 0.1);
  --base64-error-bg: #ef4444;
  --base64-success-bg: #10b981;
}

/* Light mode color overrides */
:root.light-mode .base64-card-content {
  --base64-bg-card: #ffffff;
  --base64-bg-input: #ffffff;
  --base64-bg-form: #f9fafb;
  --base64-border: #d0d7de;
  --base64-text: #24292f;
  --base64-text-secondary: #57606a;
  --base64-button-bg: #ffffff;
  --base64-button-text: #24292f;
  --base64-button-border: #d0d7de;
  --base64-button-hover-border: #0969da;
  --base64-button-hover-shadow: rgba(9, 105, 218, 0.15);
  --base64-primary-btn-bg: #0969da;
  --base64-primary-btn-border: #0969da;
  --base64-primary-btn-shadow: rgba(9, 105, 218, 0.2);
  --base64-secondary-btn-bg: #6e7781;
  --base64-secondary-btn-border: #6e7781;
  --base64-secondary-btn-shadow: rgba(110, 119, 129, 0.2);
  --base64-copy-btn-bg: #2da44e;
  --base64-copy-btn-border: #2da44e;
  --base64-copy-btn-shadow: rgba(45, 164, 78, 0.2);
  --base64-focus-border: #0969da;
  --base64-focus-shadow: rgba(9, 105, 218, 0.1);
  --base64-error-bg: #d1242f;
  --base64-success-bg: #2da44e;
}

/* ===== MAIN CARD ===== */
.base64-card-content {
  max-width: 100%;
  margin: 0 auto;
  padding: 1.25rem;
  background: var(--base64-bg-card);
  border: 1px solid var(--base64-border);
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  color: var(--base64-text);
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
}

/* Gradient top border */
.base64-card-content::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #9333ea, #3b82f6, #9333ea);
  background-size: 200% 100%;
  animation: base64GradientShift 3s ease infinite;
}

@keyframes base64GradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

/* ===== HEADER ===== */
.base64-card-content h1 {
  color: var(--base64-text);
  font-size: 1.6rem;
  margin-bottom: 1rem;
  text-align: center;
  font-weight: 600;
  letter-spacing: -0.5px;
}

.base64-intro {
  text-align: center;
  color: var(--base64-text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  line-height: 1.6;
  font-weight: 400;
}

/* ===== MODE SELECTOR ===== */
.base64-mode-selector {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.base64-mode-btn {
  padding: 0.625rem 1rem;
  background: var(--base64-button-bg);
  border: 2px solid var(--base64-button-border);
  border-radius: 8px;
  color: var(--base64-button-text);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.base64-mode-btn:hover {
  border-color: var(--base64-button-hover-border);
  background: var(--base64-bg-card);
  transform: translateY(-1px);
}

.base64-mode-btn.active {
  background: var(--base64-primary-btn-bg);
  border-color: var(--base64-primary-btn-border);
  color: white;
  box-shadow: 0 4px 12px var(--base64-primary-btn-shadow);
}

/* ===== CONVERTER SECTION ===== */
.base64-converter-section {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-top: 1rem;
}

@media (min-width: 992px) {
  .base64-converter-section {
    grid-template-columns: 1fr 1fr;
  }
}

.base64-converter-left,
.base64-converter-right {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.base64-input-group,
.base64-output-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.base64-input-group label,
.base64-output-group label {
  display: block;
  color: var(--base64-text);
  font-weight: 500;
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
}

/* ===== TEXTAREA ===== */
.base64-textarea {
  width: 100%;
  padding: 0.75rem;
  background: var(--base64-bg-input);
  color: var(--base64-text);
  border: 2px solid var(--base64-border);
  border-radius: 8px;
  font-size: 0.9rem;
  font-family: 'Courier New', 'Roboto Mono', monospace;
  line-height: 1.6;
  resize: vertical;
  transition: all 0.2s ease;
  box-sizing: border-box;
  min-height: 280px;
}

.base64-textarea::placeholder {
  color: var(--base64-text-secondary);
  opacity: 0.6;
}

.base64-textarea:focus {
  outline: none;
  border-color: var(--base64-focus-border);
  box-shadow: 0 0 0 3px var(--base64-focus-shadow);
}

.base64-textarea.base64-output {
  background: var(--base64-bg-form);
  cursor: default;
}

.base64-char-count {
  font-size: 0.75rem;
  color: var(--base64-text-secondary);
  text-align: right;
  font-family: 'Roboto Mono', monospace;
  margin-top: 0.25rem;
}

/* ===== ACTION BUTTONS ===== */
.base64-action-buttons {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin: 1rem 0;
}

.base64-btn-primary,
.base64-btn-secondary,
.base64-btn-copy {
  padding: 0.875rem 1.5rem;
  border: 2px solid var(--base64-button-border);
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  color: white;
}

.base64-btn-primary {
  background: var(--base64-primary-btn-bg);
  border-color: var(--base64-primary-btn-border);
  box-shadow: 0 2px 8px var(--base64-primary-btn-shadow);
}

.base64-btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--base64-primary-btn-shadow);
  opacity: 0.9;
}

.base64-btn-secondary {
  background: var(--base64-secondary-btn-bg);
  border-color: var(--base64-secondary-btn-border);
  box-shadow: 0 2px 8px var(--base64-secondary-btn-shadow);
}

.base64-btn-secondary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--base64-secondary-btn-shadow);
  opacity: 0.9;
}

.base64-btn-copy {
  background: var(--base64-copy-btn-bg);
  border-color: var(--base64-copy-btn-border);
  box-shadow: 0 2px 8px var(--base64-copy-btn-shadow);
}

.base64-btn-copy:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--base64-copy-btn-shadow);
  opacity: 0.9;
}

.base64-btn-primary:active,
.base64-btn-secondary:active,
.base64-btn-copy:active {
  transform: translateY(0);
}

.base64-btn-primary:disabled,
.base64-btn-secondary:disabled,
.base64-btn-copy:disabled {
  background: var(--base64-bg-form);
  border-color: var(--base64-border);
  color: var(--base64-text-secondary);
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
  opacity: 0.5;
}

/* ===== FEEDBACK BOXES ===== */
.base64-error-box,
.base64-success-box {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  text-align: center;
  display: none;
  transition: all 0.3s ease;
  opacity: 0;
  transform: translateY(-10px);
  margin-top: 1rem;
  color: white;
}

.base64-error-box {
  background: var(--base64-error-bg);
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.3);
}

.base64-success-box {
  background: var(--base64-success-bg);
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
}

.base64-error-box.base64-visible,
.base64-success-box.base64-visible {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

/* ===== INFO SECTION ===== */
.base64-info-section {
  background: var(--base64-bg-form);
  border: 1px solid var(--base64-border);
  border-radius: 12px;
  padding: 1rem;
  margin-top: 1.5rem;
  transition: all 0.3s ease;
}

.base64-info-section:hover {
  border-color: var(--base64-button-hover-border);
}

.base64-info-section h3 {
  color: var(--base64-text);
  font-weight: 600;
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
}

.base64-info-section p {
  color: var(--base64-text-secondary);
  line-height: 1.6;
  margin-bottom: 0.75rem;
}

.base64-info-section ul {
  list-style: none;
  padding-left: 0;
  margin-bottom: 1rem;
}

.base64-info-section li {
  color: var(--base64-text-secondary);
  padding: 0.375rem 0;
  line-height: 1.5;
}

.base64-example {
  background: var(--base64-bg-input);
  border: 1px solid var(--base64-border);
  border-radius: 8px;
  padding: 0.75rem;
  margin-top: 0.75rem;
  font-family: 'Courier New', monospace;
  font-size: 0.875rem;
}

.base64-example strong {
  color: var(--base64-text);
  display: block;
  margin-bottom: 0.5rem;
}

.base64-example code {
  color: var(--base64-text);
  background: var(--base64-bg-form);
  padding: 2px 6px;
  border-radius: 4px;
}

/* ===== QUICK EXAMPLES ===== */
.base64-quick-examples {
  margin-top: 1.5rem;
  padding: 1rem;
  background: var(--base64-bg-form);
  border: 1px solid var(--base64-border);
  border-radius: 12px;
  transition: all 0.3s ease;
}

.base64-quick-examples:hover {
  border-color: var(--base64-button-hover-border);
}

.base64-quick-examples h3 {
  color: var(--base64-text);
  font-weight: 600;
  font-size: 1.1rem;
  margin-bottom: 1rem;
  text-align: center;
}

.base64-example-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.75rem;
}

.base64-example-btn {
  padding: 0.75rem 1rem;
  background: var(--base64-button-bg);
  border: 2px solid var(--base64-button-border);
  border-radius: 8px;
  color: var(--base64-button-text);
  font-size: 0.8rem;
  font-weight: 500;
  font-family: 'Courier New', monospace;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.base64-example-btn:hover {
  border-color: var(--base64-button-hover-border);
  background: var(--base64-bg-card);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px var(--base64-button-hover-shadow);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 991px) {
  .base64-card-content {
    padding: 1rem;
  }

  .base64-card-content h1 {
    font-size: 1.5rem;
  }

  .base64-converter-section {
    grid-template-columns: 1fr;
  }

  .base64-action-buttons {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 576px) {
  .base64-card-content {
    padding: 1rem;
    border-radius: 12px;
  }

  .base64-card-content h1 {
    font-size: 1.35rem;
    margin-bottom: 1rem;
  }

  .base64-intro {
    font-size: 0.85rem;
    margin-bottom: 1.25rem;
  }

  .base64-mode-selector {
    flex-direction: column;
    gap: 0.5rem;
  }

  .base64-mode-btn {
    width: 100%;
    justify-content: center;
  }

  .base64-textarea {
    font-size: 0.85rem;
    padding: 0.75rem;
    min-height: 200px;
  }

  .base64-btn-primary,
  .base64-btn-secondary,
  .base64-btn-copy {
    padding: 0.75rem 1.25rem;
    font-size: 0.875rem;
  }

  .base64-example-buttons {
    grid-template-columns: 1fr;
  }

  .base64-example-btn {
    white-space: normal;
  }
}