/* SquidScale Courses - Dedicated Minimalist Stylesheet */

:root {
  --bg-color: #ffffff;
  --text-primary: #0a0a0a;
  --text-secondary: #6e6e73;
  --accent-color: #0071e3;
  --accent-color-hover: #0077ed;
  --border-color: #e5e5e7;
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --max-width: 980px;
}

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

body {
  font-family: var(--font-stack);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.47059;
  font-weight: 400;
  letter-spacing: -0.022em;
  -webkit-font-smoothing: antialiased;
}

/* Base Layout Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 40px;
}

/* Header */
header {
  border-bottom: 1px solid var(--border-color);
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  position: sticky;
  top: 0;
  z-index: 99;
}

header .header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo-link {
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -0.011em;
  color: var(--text-primary);
  text-decoration: none;
}

/* Hero Section */
.hero {
  padding: 80px 0 60px 0;
  border-bottom: 1px solid var(--border-color);
}

.hero h1 {
  font-size: 56px;
  line-height: 1.07143;
  font-weight: 700;
  letter-spacing: -0.005em;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.hero p {
  font-size: 24px;
  line-height: 1.16667;
  font-weight: 400;
  letter-spacing: .009em;
  color: var(--text-secondary);
  max-width: 600px;
}

/* Grid Layout for Homepage Courses */
.grid {
  display: grid;
  grid-template-columns: repeat(1, minmax(0, 1fr));
  gap: 32px;
  padding: 60px 0;
}

@media (min-width: 768px) {
  .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Course Card */
.card {
  border: 1px solid var(--border-color);
  padding: 40px;
  border-radius: 18px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 320px;
}

.card-title {
  font-size: 28px;
  line-height: 1.14286;
  font-weight: 600;
  letter-spacing: 0.007em;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.card-desc {
  font-size: 17px;
  line-height: 1.47059;
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.card-price {
  font-size: 19px;
  line-height: 1.4211;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 24px;
}

/* Buttons */
.btn {
  display: inline-block;
  background-color: var(--accent-color);
  color: #ffffff;
  border: none;
  font-size: 17px;
  line-height: 1.17649;
  font-weight: 400;
  letter-spacing: -0.022em;
  padding: 12px 24px;
  border-radius: 980px;
  text-decoration: none;
  text-align: center;
  cursor: pointer;
  width: 100%;
}

.btn:active {
  background-color: #0062c3;
}

/* Course Page Details */
.course-detail {
  padding: 60px 0;
  max-width: 640px;
  margin: 0 auto;
}

.course-detail h1 {
  font-size: 40px;
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: -0.009em;
  margin-bottom: 8px;
}

.course-detail .price-badge {
  font-size: 21px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 40px;
}

.detail-section {
  margin-bottom: 40px;
}

.detail-section h2 {
  font-size: 24px;
  line-height: 1.16667;
  font-weight: 600;
  letter-spacing: .009em;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.detail-section ul {
  list-style: none;
}

.detail-section li {
  font-size: 17px;
  line-height: 1.47059;
  color: var(--text-primary);
  margin-bottom: 16px;
  position: relative;
  padding-left: 24px;
}

.detail-section li::before {
  content: "•";
  color: var(--accent-color);
  position: absolute;
  left: 0;
  font-size: 20px;
  line-height: 1;
}

/* Checkout Form */
form {
  border: 1px solid var(--border-color);
  padding: 40px;
  border-radius: 18px;
  margin-top: 40px;
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  padding: 14px 16px;
  font-size: 17px;
  font-family: inherit;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  background-color: #ffffff;
  color: var(--text-primary);
  outline: none;
}

.form-control:focus {
  border-color: var(--accent-color);
}

.input-suffix {
  position: relative;
}

.input-suffix span {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  font-size: 17px;
}

.input-suffix input {
  padding-left: 32px;
}

.helper-text {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 6px;
  display: block;
}

.error-message {
  color: #ff3b30;
  font-size: 13px;
  margin-top: 6px;
  display: none;
}

/* Footer style */
footer {
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
  margin-top: 80px;
}

footer p {
  font-size: 12px;
  color: var(--text-secondary);
}

/* Simple Feedback Pages */
.message-page {
  text-align: center;
  padding: 120px 0;
  max-width: 500px;
  margin: 0 auto;
}

.message-page h1 {
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -0.009em;
  margin-bottom: 16px;
}

.message-page p {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.47059;
  margin-bottom: 40px;
}

.back-link {
  color: var(--accent-color);
  text-decoration: none;
  font-size: 17px;
  font-weight: 500;
}

/* Loading/Dynamic Hydration state styling */
.skeleton {
  background: #f5f5f7;
  height: 20px;
  margin-bottom: 10px;
  border-radius: 4px;
}