/* CSS Reset & Variables */
:root {
    --primary-blue: #2563eb;
    --primary-blue-dark: #1d4ed8;
    --gradient-start: #1d4ed8;
    --gradient-end: #3b82f6;
    --accent-yellow: #fde047;
    --bg-body: #f3f4f6;
    --bg-card: #ffffff;
    --bg-light: #f9fafb;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
}

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

body {
    font-family: 'Noto Sans KR', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Header Section */
.header {
    background: linear-gradient(to right, var(--gradient-start), var(--gradient-end));
    color: #ffffff;
    padding: 3rem 1rem;
    text-align: center;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.header-inner {
    max-width: 56rem;
    margin: 0 auto;
}

.header-title {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -0.025em;
    line-height: 1.2;
}

.text-accent {
    color: var(--accent-yellow);
}

.header-price-badge {
    display: inline-block;
    background-color: rgba(30, 64, 175, 0.4);
    padding: 0.5rem 1.5rem;
    border-radius: 9999px;
    font-size: 1.125rem;
    font-weight: 500;
    margin-bottom: 2rem;
}

.header-price-badge strong {
    font-weight: 700;
    color: var(--accent-yellow);
}

.header-link-box {
    background-color: var(--bg-card);
    color: var(--text-main);
    padding: 1.5rem;
    border-radius: 1rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    max-width: 42rem;
    margin: 0.5rem auto 0;
}

.header-link-box p {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary-blue);
    color: #ffffff;
    font-weight: 700;
    padding: 0.75rem 2rem;
    border-radius: 0.75rem;
    text-decoration: none;
    transition: background-color 0.3s ease;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    width: 100%;
}

@media (min-width: 768px) {
    .btn-primary { width: auto; }
    .header-title { font-size: 2.5rem; }
    .header-title br { display: none; }
}

.btn-primary:hover {
    background-color: var(--primary-blue-dark);
}

.btn-icon {
    width: 1.25rem;
    height: 1.25rem;
    margin-left: 0.5rem;
}

/* Main Content Section */
.main-container {
    max-width: 48rem;
    margin: 0 auto;
    padding: 3rem 1rem;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #111827;
    border-bottom: 2px solid var(--primary-blue);
    display: inline-block;
    padding-bottom: 0.5rem;
}

.section-desc {
    margin-top: 1rem;
    color: var(--text-muted);
}

.step-list {
    display: flex;
    flex-direction: column;
    gap: 4rem;
}

.step-card {
    background-color: var(--bg-card);
    padding: 1.5rem;
    border-radius: 1rem;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
}

@media (min-width: 768px) {
    .step-card { padding: 2rem; }
}

.step-header {
    display: flex;
    align-items: center;
    width: 100%;
    margin-bottom: 1.5rem;
}

.step-number {
    background-color: var(--primary-blue);
    color: #ffffff;
    border-radius: 9999px;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.step-title {
    margin-left: 1rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
}

.step-img {
    width: 100%;
    max-width: 28rem;
    border-radius: 0.75rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    border: 1px solid #f3f4f6;
    height: auto;
}

.step-desc {
    margin-top: 1.5rem;
    color: #374151;
    text-align: center;
    background-color: var(--bg-light);
    width: 100%;
    padding: 1rem;
    border-radius: 0.5rem;
}

/* Footer */
.footer {
    background-color: #1f2937;
    color: #9ca3af;
    padding: 2rem 1rem;
    text-align: center;
    margin-top: 3rem;
}

.footer-inner {
    max-width: 56rem;
    margin: 0 auto;
}

.footer-notice {
    margin-bottom: 0.5rem;
}

.footer-copyright {
    font-size: 0.875rem;
}