/* CSS Variable Definitions for Light and Dark Modes */
:root {
  /* Light Mode Palette */
  --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
  --card-bg: rgba(255, 255, 255, 0.75);
  --card-border: rgba(255, 255, 255, 0.4);
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --input-bg: rgba(255, 255, 255, 0.9);
  --input-border: #cbd5e1;
  --input-focus: #4f46e5;
  --input-focus-shadow: rgba(79, 70, 229, 0.15);
  --accent-color: #4f46e5;
  --accent-hover: #4338ca;
  --success-color: #10b981;
  --error-color: #ef4444;
  --toggle-bg: rgba(0, 0, 0, 0.05);
  --toggle-text: #334155;
  --shadow-color: rgba(15, 23, 42, 0.08);
  --decor-circle-1: rgba(99, 102, 241, 0.15);
  --decor-circle-2: rgba(236, 72, 153, 0.12);
}

[data-theme="dark"] {
  /* Dark Mode Palette */
  --bg-gradient: linear-gradient(135deg, #0f172a 0%, #020617 100%);
  --card-bg: rgba(30, 41, 59, 0.7);
  --card-border: rgba(255, 255, 255, 0.08);
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --input-bg: rgba(15, 23, 42, 0.6);
  --input-border: #334155;
  --input-focus: #818cf8;
  --input-focus-shadow: rgba(129, 140, 248, 0.25);
  --accent-color: #6366f1;
  --accent-hover: #4f46e5;
  --success-color: #34d399;
  --error-color: #f87171;
  --toggle-bg: rgba(255, 255, 255, 0.08);
  --toggle-text: #f1f5f9;
  --shadow-color: rgba(0, 0, 0, 0.4);
  --decor-circle-1: rgba(99, 102, 241, 0.25);
  --decor-circle-2: rgba(236, 72, 153, 0.2);
}

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

body {
  font-family: 'Outfit', 'Noto Sans KR', sans-serif;
  background: var(--bg-gradient);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 60px 20px;
  position: relative;
  overflow-x: hidden;
  transition: background 0.4s ease, color 0.4s ease;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  background-color: var(--toggle-bg);
  color: var(--toggle-text);
  border: 1px solid var(--card-border);
  border-radius: 30px;
  cursor: pointer;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 100;
}

.theme-toggle-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-color);
}

/* Decorative Background Elements */
.background-decorations {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  z-index: -1;
  pointer-events: none;
}

.circle {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  animation: floatDecoration 12s infinite alternate ease-in-out;
}

.circle-1 {
  width: 400px;
  height: 400px;
  background: var(--decor-circle-1);
  top: -100px;
  left: -100px;
}

.circle-2 {
  width: 500px;
  height: 500px;
  background: var(--decor-circle-2);
  bottom: -150px;
  right: -150px;
  animation-delay: -6s;
}

@keyframes floatDecoration {
  0% {
    transform: translateY(0) scale(1);
  }
  100% {
    transform: translateY(50px) scale(1.1);
  }
}

/* Glassmorphism Card Container */
.form-container {
  max-width: 750px;
  width: 100%;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 24px;
  padding: 50px;
  box-shadow: 0 20px 40px var(--shadow-color);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: background 0.4s ease, border 0.4s ease, box-shadow 0.4s ease;
  position: relative;
}

/* Form Header */
.form-header {
  text-align: center;
  margin-bottom: 40px;
}

.logo {
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent-color);
  margin-bottom: 12px;
}

.form-header h1 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.6;
}

/* Grid Layout for Form */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px 20px;
  margin-bottom: 30px;
}

.form-group {
  display: flex;
  flex-direction: column;
  position: relative;
}

.form-group.full-width {
  grid-column: span 2;
}

/* Labels and Inputs */
label {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
}

.required {
  color: var(--error-color);
  margin-left: 3px;
}

input[type="text"],
input[type="email"],
input[type="tel"],
select,
textarea {
  width: 100%;
  padding: 14px 16px;
  font-family: inherit;
  font-size: 15px;
  background-color: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 12px;
  color: var(--text-primary);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  outline: none;
}

input::placeholder,
textarea::placeholder {
  color: var(--text-muted);
  opacity: 0.8;
}

/* Focus and Validation Styling */
input:focus,
select:focus,
textarea:focus {
  border-color: var(--input-focus);
  box-shadow: 0 0 0 4px var(--input-focus-shadow);
  background-color: rgba(255, 255, 255, 1);
}

[data-theme="dark"] input:focus,
[data-theme="dark"] select:focus,
[data-theme="dark"] textarea:focus {
  background-color: rgba(15, 23, 42, 0.9);
}

/* Error messages and states */
.error-msg {
  font-size: 12px;
  color: var(--error-color);
  margin-top: 6px;
  display: none;
  opacity: 0;
  transform: translateY(-5px);
  transition: all 0.3s ease;
}

.form-group.has-error input,
.form-group.has-error select,
.form-group.has-error textarea {
  border-color: var(--error-color);
  background-color: rgba(239, 68, 68, 0.03);
}

.form-group.has-error .error-msg {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

/* Custom Dropdown select indicator */
.select-wrapper {
  position: relative;
}

.select-wrapper::after {
  content: "";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 6px solid var(--text-secondary);
  pointer-events: none;
  transition: transform 0.3s ease;
}

select {
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  padding-right: 40px;
}

select:focus + .select-wrapper::after {
  transform: translateY(-50%) rotate(180deg);
}

/* Custom Textarea & Char Count */
textarea {
  min-height: 150px;
  resize: vertical;
  line-height: 1.6;
}

.char-count {
  align-self: flex-end;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
}

/* Custom Checkbox */
.checkbox-group {
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  margin-top: 8px;
}

.checkbox-container {
  display: flex;
  align-items: center;
  position: relative;
  cursor: pointer;
  user-select: none;
  margin-bottom: 0;
  font-weight: 500;
  font-size: 14px;
}

.checkbox-container input {
  position: absolute;
  opacity: 0;
  cursor: pointer;
  height: 0;
  width: 0;
}

.checkmark {
  position: relative;
  display: inline-block;
  height: 20px;
  width: 20px;
  background-color: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 6px;
  margin-right: 10px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.checkbox-container:hover input ~ .checkmark {
  border-color: var(--input-focus);
}

.checkbox-container input:checked ~ .checkmark {
  background-color: var(--accent-color);
  border-color: var(--accent-color);
}

.checkmark::after {
  content: "";
  position: absolute;
  display: none;
  left: 6px;
  top: 2px;
  width: 5px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.checkbox-container input:checked ~ .checkmark::after {
  display: block;
}

.privacy-link {
  font-size: 13px;
  color: var(--accent-color);
  text-decoration: underline;
  cursor: pointer;
  font-weight: 500;
  transition: color 0.3s ease;
}

.privacy-link:hover {
  color: var(--accent-hover);
}

/* Submit Button & Animations */
.submit-btn {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  padding: 16px;
  font-size: 16px;
  font-weight: 600;
  font-family: inherit;
  color: white;
  background: var(--accent-color);
  border: none;
  border-radius: 12px;
  cursor: pointer;
  box-shadow: 0 10px 20px rgba(79, 70, 229, 0.25);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.submit-btn:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(79, 70, 229, 0.35);
}

.submit-btn:active {
  transform: translateY(0);
}

/* Button Spinner state */
.submit-btn .spinner {
  display: none;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 0.8s linear infinite;
  margin-left: 10px;
}

.submit-btn.is-loading {
  pointer-events: none;
  opacity: 0.8;
}

.submit-btn.is-loading .spinner {
  display: inline-block;
}

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

/* Success/Error Status Card Screens */
.status-card {
  text-align: center;
  padding: 40px 10px;
  animation: scaleIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes scaleIn {
  from {
    transform: scale(0.9);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.status-card h2 {
  font-size: 26px;
  font-weight: 700;
  margin: 24px 0 12px;
}

.status-card p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.6;
  max-width: 480px;
  margin: 0 auto 30px;
}

.icon-circle {
  width: 80px;
  height: 80px;
  background-color: rgba(16, 185, 129, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
}

.icon-circle.error-icon {
  background-color: rgba(239, 110, 110, 0.1);
}

/* SVG Checkmark/Error animations */
.checkmark-svg {
  width: 40px;
  height: 40px;
  stroke: var(--success-color);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

.checkmark-circle {
  stroke-dasharray: 166;
  stroke-dashoffset: 166;
  stroke: var(--success-color);
  stroke-width: 2;
  animation: strokeCircle 0.6s cubic-bezier(0.65, 0, 0.45, 1) forwards;
}

.checkmark-check {
  stroke-dasharray: 48;
  stroke-dashoffset: 48;
  animation: strokeCheck 0.3s cubic-bezier(0.65, 0, 0.45, 1) 0.6s forwards;
}

.error-svg {
  width: 32px;
  height: 32px;
  stroke: var(--error-color);
  stroke-width: 4;
  stroke-linecap: round;
  fill: none;
}

.error-circle {
  stroke-dasharray: 166;
  stroke-dashoffset: 166;
  stroke: var(--error-color);
  stroke-width: 2;
  animation: strokeCircle 0.6s cubic-bezier(0.65, 0, 0.45, 1) forwards;
}

.error-line1, .error-line2 {
  stroke-dasharray: 30;
  stroke-dashoffset: 30;
}

.error-line1 {
  animation: strokeCheck 0.3s cubic-bezier(0.65, 0, 0.45, 1) 0.5s forwards;
}

.error-line2 {
  animation: strokeCheck 0.3s cubic-bezier(0.65, 0, 0.45, 1) 0.7s forwards;
}

@keyframes strokeCircle {
  100% {
    stroke-dashoffset: 0;
  }
}

@keyframes strokeCheck {
  100% {
    stroke-dashoffset: 0;
  }
}

.secondary-btn {
  padding: 12px 28px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  border-radius: 12px;
  border: 1px solid var(--input-border);
  background-color: var(--input-bg);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.3s ease;
}

.secondary-btn:hover {
  background-color: var(--text-primary);
  color: var(--input-bg);
  border-color: var(--text-primary);
}

/* Responsive Design */
@media (max-width: 768px) {
  body {
    padding: 40px 16px;
  }
  
  .form-container {
    padding: 30px 20px;
  }

  .form-header h1 {
    font-size: 26px;
  }

  .form-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .form-group.full-width {
    grid-column: span 1;
  }

  .checkbox-group {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
}