/* CSS Variables for themes */
:root {
  --bg-color: #ffffff;
  --text-color: #1a1a1a;
  --text-muted: #666666;
  --btn-bg: #e0e0e0;
  --btn-text: #1a1a1a;
  --btn-hover: #c8c8c8;
  --toggle-bg: #333333;
  --toggle-text: #ffffff;
  --toggle-hover: #555555;
  --border-color: #dddddd;
  --card-bg: #f5f5f5;
  --input-bg: #ffffff;
  --input-border: #cccccc;
  --input-focus: #4a90e2;
  --submit-bg: #4a90e2;
  --submit-hover: #357abd;
  --success-bg: #e6f4ea;
  --success-text: #1e7e34;
  --error-bg: #fdecea;
  --error-text: #c62828;
  --transition: 0.3s ease;
}

[data-theme="dark"] {
  --bg-color: #121212;
  --text-color: #e0e0e0;
  --text-muted: #999999;
  --btn-bg: #2e2e2e;
  --btn-text: #e0e0e0;
  --btn-hover: #3e3e3e;
  --toggle-bg: #f0f0f0;
  --toggle-text: #1a1a1a;
  --toggle-hover: #cccccc;
  --border-color: #333333;
  --card-bg: #1e1e1e;
  --input-bg: #2a2a2a;
  --input-border: #444444;
  --input-focus: #5ba3f5;
  --submit-bg: #5ba3f5;
  --submit-hover: #4a90e2;
  --success-bg: #1a3a22;
  --success-text: #81c784;
  --error-bg: #3a1a1a;
  --error-text: #ef9a9a;
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  transition: background-color var(--transition), color var(--transition);
  min-height: 100vh;
}

/* Header */
header {
  position: fixed;
  top: 0;
  right: 0;
  padding: 16px;
  z-index: 100;
}

.theme-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  background-color: var(--toggle-bg);
  color: var(--toggle-text);
  border: none;
  border-radius: 24px;
  padding: 8px 16px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: background-color var(--transition), color var(--transition);
}

.theme-toggle:hover {
  background-color: var(--toggle-hover);
}

.theme-toggle .icon {
  font-size: 18px;
  line-height: 1;
}

/* Main layout */
main {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 80px 16px 60px;
  gap: 48px;
}

/* Hero section */
.hero {
  width: 100%;
  display: flex;
  justify-content: center;
}

.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 40px 48px;
  text-align: center;
  transition: background-color var(--transition), border-color var(--transition);
}

h1 {
  font-size: 2rem;
  margin-bottom: 24px;
}

.press-btn {
  background-color: var(--btn-bg);
  color: var(--btn-text);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 24px;
  font-size: 15px;
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition);
}

.press-btn:hover {
  background-color: var(--btn-hover);
}

/* Contact section */
.contact-section {
  width: 100%;
  max-width: 560px;
}

.contact-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 40px 48px;
  transition: background-color var(--transition), border-color var(--transition);
}

h2 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.contact-desc {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 28px;
  line-height: 1.5;
}

/* Form */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 20px;
}

label {
  font-size: 14px;
  font-weight: 600;
}

.required {
  color: #e53935;
}

input,
textarea {
  background-color: var(--input-bg);
  color: var(--text-color);
  border: 1px solid var(--input-border);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 14px;
  font-family: inherit;
  transition: border-color var(--transition), background-color var(--transition);
  width: 100%;
  outline: none;
}

input:focus,
textarea:focus {
  border-color: var(--input-focus);
}

textarea {
  resize: vertical;
  min-height: 120px;
}

.submit-btn {
  width: 100%;
  background-color: var(--submit-bg);
  color: #ffffff;
  border: none;
  border-radius: 8px;
  padding: 12px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition);
  margin-top: 4px;
}

.submit-btn:hover:not(:disabled) {
  background-color: var(--submit-hover);
}

.submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Result messages */
.form-message {
  margin-top: 20px;
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 14px;
  line-height: 1.5;
}

.form-message.success {
  background-color: var(--success-bg);
  color: var(--success-text);
}

.form-message.error {
  background-color: var(--error-bg);
  color: var(--error-text);
}

/* Disqus section */
.disqus-section {
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding: 0 16px 60px;
}

.disqus-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 40px 48px;
  transition: background-color var(--transition), border-color var(--transition);
}

.disqus-card h2 {
  font-size: 1.5rem;
  margin-bottom: 24px;
}

#disqus_thread {
  color-scheme: normal;
}

@media (max-width: 600px) {
  .card,
  .contact-card,
  .disqus-card {
    padding: 28px 20px;
  }
}