:root {
    --color-bg: #f7f7f5;
    --color-surface: #ffffff;
    --color-text: #1a1a1a;
    --color-text-secondary: #555;
    --color-text-muted: #888;
    --color-border: #e2e2e2;
    --color-accent: #5fa8a1;
    --color-accent-light: #e8f5f3;
    --color-accent-hover: #4d948e;
    --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

body {
    font-family: var(--font-body);
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header & Navigation */
header {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
}

.logo {
    font-family: var(--font-body);
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.logo a {
    color: inherit;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 28px;
    list-style: none;
}

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--color-accent);
}

.nav-links a.nav-cta {
    color: var(--color-accent);
    font-weight: 700;
}

.nav-links a.nav-cta:hover {
    color: var(--color-accent-hover);
}

/* Hero Section */
.hero {
    background: linear-gradient(165deg, #ffffff 0%, #f0faf9 40%, #e8f5f3 100%);
    padding: 100px 0 80px;
    text-align: center;
    border-bottom: 1px solid var(--color-border);
}

h1 {
    font-family: var(--font-heading);
    font-size: 52px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--color-text);
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.subtitle {
    font-size: 19px;
    color: var(--color-text-secondary);
    max-width: 680px;
    margin: 0 auto 44px;
    line-height: 1.7;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 32px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
    transition: all 0.2s;
    display: inline-block;
}

.btn-primary {
    background: var(--color-accent);
    color: #ffffff;
    border: 2px solid var(--color-accent);
}

.btn-primary:hover {
    background: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(95, 168, 161, 0.3);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border: 2px solid var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-1px);
}

/* Section Styles */
section {
    padding: 88px 0;
}

section:nth-child(even) {
    background: var(--color-surface);
}

h2 {
    font-family: var(--font-heading);
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--color-text);
    letter-spacing: -0.02em;
    line-height: 1.2;
}

h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--color-text);
}

h4 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-text);
}

p {
    margin-bottom: 16px;
    color: var(--color-text-secondary);
}

/* Decision Framework */
.decision-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-top: 40px;
}

.decision-card {
    background: var(--color-surface);
    padding: 32px;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    box-shadow: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.03);
    transition: transform 0.2s, box-shadow 0.2s;
}

.decision-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.06), 0 8px 24px rgba(0,0,0,0.06);
}

.decision-card.yes {
    border-color: var(--color-border);
    border-left: 4px solid #91c9a5;
}

.decision-card.no {
    border-color: var(--color-border);
    border-left: 4px solid #e6a9a9;
}

.decision-card.maybe {
    border-color: var(--color-border);
    border-left: 4px solid #ebc98e;
}

.decision-label {
    display: inline-block;
    padding: 0;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
}

.yes .decision-label {
    color: #91c9a5;
}

.no .decision-label {
    color: #e6a9a9;
}

.maybe .decision-label {
    color: #ebc98e;
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: 40px;
    margin-top: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-accent), var(--color-border));
}

.timeline-item {
    position: relative;
    margin-bottom: 48px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -46px;
    top: 4px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-accent);
    border: 3px solid var(--color-bg);
    box-shadow: 0 0 0 2px var(--color-accent-light);
}

.timeline-duration {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
}

/* Cost Calculator */
.cost-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    margin-top: 40px;
}

.cost-card {
    background: var(--color-surface);
    padding: 28px;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.cost-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-text-muted);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.cost-amount {
    font-family: var(--font-body);
    font-size: 32px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.cost-description {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.cost-total {
    background: var(--color-text);
    color: #ffffff;
    border-color: var(--color-text);
}

.cost-total .cost-label {
    color: rgba(255,255,255,0.7);
}

.cost-total .cost-amount {
    color: #ffffff;
}

.cost-total .cost-description {
    color: rgba(255,255,255,0.6);
}

/* Vendor Comparison Table */
.table-wrapper {
    overflow-x: auto;
    margin-top: 40px;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-surface);
    border-radius: 8px;
    overflow: hidden;
}

th {
    background: var(--color-bg);
    padding: 14px 16px;
    text-align: left;
    font-weight: 600;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-text-secondary);
    border-bottom: 2px solid var(--color-accent);
}

td {
    padding: 16px;
    border-bottom: 1px solid var(--color-border);
    font-size: 14px;
    color: var(--color-text-secondary);
}

tr:hover {
    background: var(--color-accent-light);
}

tbody tr:nth-child(even) {
    background: rgba(0,0,0,0.01);
}

tbody tr:nth-child(even):hover {
    background: var(--color-accent-light);
}

/* Checklist Preview */
.checklist-preview {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 32px;
    margin-top: 40px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.checklist-category {
    margin-bottom: 32px;
}

.checklist-category h4 {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.priority-badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
}

.priority-p0 {
    background: #fee2e2;
    color: #991b1b;
}

.priority-p1 {
    background: #fef3c7;
    color: #92400e;
}

.checklist-items {
    display: grid;
    gap: 12px;
}

.checklist-item {
    display: flex;
    gap: 12px;
    padding: 14px 16px;
    background: var(--color-bg);
    border-radius: 8px;
    border: 1px solid transparent;
    transition: border-color 0.2s;
}

.checklist-item:hover {
    border-color: var(--color-border);
}

.checkbox {
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border);
    border-radius: 4px;
    flex-shrink: 0;
    margin-top: 2px;
}

/* Mistakes Section */
.mistakes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 24px;
    margin-top: 40px;
}

.mistake-card {
    background: var(--color-surface);
    padding: 28px;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    border-left: 4px solid #e6a9a9;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.mistake-number {
    font-size: 11px;
    font-weight: 700;
    color: #e6a9a9;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

/* Resources */
.resource-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-top: 40px;
}

.resource-card {
    background: var(--color-surface);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    text-decoration: none;
    transition: all 0.2s;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.resource-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}

.resource-type {
    font-size: 11px;
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 8px;
}

.resource-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 8px;
}

.resource-description {
    font-size: 14px;
    color: var(--color-text-secondary);
}

/* Alert Box */
.alert {
    padding: 20px 24px;
    border-radius: 10px;
    margin: 24px 0;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
}

.alert-warning {
    border-left: 3px solid var(--color-accent);
}

.alert-info {
    border-left: 3px solid var(--color-accent);
}

.alert-green {
    border-left: 3px solid var(--color-accent);
}

/* Footer */
footer {
    background: var(--color-text);
    color: #ffffff;
    padding: 60px 0 40px;
    margin-top: 40px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    color: #ffffff;
    margin-bottom: 16px;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: #a0a0a0;
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: #ffffff;
}

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid #333;
    color: #a0a0a0;
    font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
    h1 {
        font-size: 36px;
    }

    h2 {
        font-size: 32px;
    }

    .nav-links {
        display: none;
    }

    section {
        padding: 56px 0;
    }

    .hero {
        padding: 56px 0 40px;
    }

    .decision-grid {
        grid-template-columns: 1fr;
    }

    .cost-grid {
        grid-template-columns: 1fr;
    }
}

/* Details/Summary Styling */
details {
    transition: all 0.3s;
}

details[open] {
    background: var(--color-surface) !important;
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--color-accent);
}

summary {
    font-size: 15px;
    color: var(--color-text);
    cursor: pointer;
    list-style: none;
}

summary::-webkit-details-marker {
    display: none;
}

summary::before {
    content: '▸';
    display: inline-block;
    margin-right: 8px;
    transition: transform 0.2s;
    color: var(--color-accent);
    font-size: 13px;
}

details[open] > summary::before {
    transform: rotate(90deg);
}

summary:hover {
    color: var(--color-accent);
}

code {
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 13px;
}

pre code {
    background: transparent;
    padding: 0;
    border-radius: 0;
}

details h4 {
    font-size: 15px;
    color: var(--color-text);
    margin-top: 16px;
}

details ul {
    line-height: 1.8;
}

details a {
    color: var(--color-accent-hover);
    text-decoration: underline;
}

details a:hover {
    color: var(--color-accent);
}

/* Subtle section entrance animation */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

section .container {
    animation: fadeInUp 0.5s ease both;
}