/* ===========================
   Case Study — Dark Theme
   Matching pawelparuzel.pl
   =========================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Playfair+Display:ital,wght@0,500;0,700;1,500&display=swap');

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

:root {
    --bg-primary: #0a0a0b;
    --bg-secondary: #111113;
    --bg-card: #16161a;
    --bg-card-hover: #1c1c21;
    --text-primary: #f0f0f2;
    --text-secondary: #8e8e96;
    --text-muted: #55555e;
    --accent: #c9a84c;
    --accent-light: #e0c76e;
    --accent-glow: rgba(201, 168, 76, 0.15);
    --accent-glow-strong: rgba(201, 168, 76, 0.3);
    --border: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);
    --radius: 16px;
    --radius-sm: 10px;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-serif: 'Playfair Display', Georgia, serif;
    --max-width: 900px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    line-height: 1.7;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.3s;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* --- Nav --- */
.cs-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 20px 40px;
    background: rgba(10, 10, 11, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border);
}

.cs-nav__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.cs-nav__back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.3s;
}

.cs-nav__back:hover {
    color: var(--text-primary);
}

.cs-nav__logo {
    font-family: var(--font-serif);
    font-size: 18px;
    font-weight: 700;
    font-style: italic;
    color: var(--accent);
}

/* --- Hero --- */
.cs-hero {
    padding: 140px 40px 80px;
    text-align: center;
}

.cs-hero__inner {
    max-width: var(--max-width);
    margin: 0 auto;
}

.cs-hero__eyebrow {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--accent);
    margin-bottom: 20px;
}

.cs-hero__title {
    font-family: var(--font-serif);
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -1px;
    margin-bottom: 20px;
}

.cs-hero__title em {
    color: var(--accent);
    font-style: italic;
}

.cs-hero__subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto 40px;
}

.cs-hero__meta {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.cs-hero__meta-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.cs-hero__meta-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
}

.cs-hero__meta-value {
    font-family: var(--font-serif);
    font-size: 28px;
    font-weight: 700;
    color: var(--accent);
}

/* --- Content --- */
.cs-section {
    padding: 60px 40px;
    border-top: 1px solid var(--border);
}

.cs-section--alt {
    background: var(--bg-secondary);
}

.cs-content {
    max-width: var(--max-width);
    margin: 0 auto;
}

.cs-content h2 {
    font-family: var(--font-serif);
    font-size: clamp(28px, 3.5vw, 38px);
    font-weight: 700;
    margin-bottom: 24px;
    letter-spacing: -0.5px;
}

.cs-content h3 {
    font-size: 20px;
    font-weight: 600;
    margin-top: 32px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.cs-content p {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.cs-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.cs-content ul {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 24px;
}

.cs-content ul li {
    font-size: 15px;
    color: var(--text-secondary);
    padding-left: 24px;
    position: relative;
}

.cs-content ul li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 600;
}

/* --- Screenshots --- */
.cs-screenshot {
    margin: 40px 0;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: 0 20px 60px -15px rgba(0, 0, 0, 0.6);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.4s;
}

.cs-screenshot:hover {
    transform: translateY(-4px);
    box-shadow: 0 30px 80px -15px rgba(0, 0, 0, 0.7);
}

.cs-screenshot img {
    width: 100%;
}

.cs-screenshot__caption {
    padding: 16px 24px;
    background: var(--bg-card);
    font-size: 13px;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
}

/* --- Stats Grid --- */
.cs-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
    margin: 32px 0;
}

.cs-stat {
    padding: 28px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    text-align: center;
}

.cs-stat__number {
    font-family: var(--font-serif);
    font-size: 36px;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 4px;
}

.cs-stat__label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
}

/* --- Tech Stack --- */
.cs-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 20px 0;
}

.cs-tech__tag {
    font-size: 12px;
    font-weight: 600;
    padding: 6px 16px;
    background: var(--accent-glow);
    border: 1px solid rgba(201, 168, 76, 0.2);
    border-radius: 100px;
    color: var(--accent);
    letter-spacing: 0.3px;
}

/* --- Timeline --- */
.cs-timeline {
    margin: 32px 0;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.cs-timeline__item {
    display: flex;
    gap: 24px;
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
}

.cs-timeline__week {
    flex-shrink: 0;
    width: 80px;
    font-size: 13px;
    font-weight: 600;
    color: var(--accent);
    padding-top: 2px;
}

.cs-timeline__desc {
    font-size: 15px;
    color: var(--text-secondary);
}

/* --- CTA --- */
.cs-cta {
    padding: 80px 40px;
    text-align: center;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
}

.cs-cta__inner {
    max-width: 600px;
    margin: 0 auto;
}

.cs-cta__title {
    font-family: var(--font-serif);
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 700;
    margin-bottom: 16px;
}

.cs-cta__title em {
    color: var(--accent);
    font-style: italic;
}

.cs-cta__desc {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.cs-cta__btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 40px;
    background: var(--accent);
    color: var(--bg-primary);
    font-family: var(--font-sans);
    font-size: 15px;
    font-weight: 600;
    border: none;
    border-radius: 100px;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    letter-spacing: 0.3px;
}

.cs-cta__btn:hover {
    background: var(--accent-light);
    color: var(--bg-primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px -8px rgba(201, 168, 76, 0.4);
}

/* --- Before / After --- */
.cs-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 32px 0;
}

.cs-comparison__col {
    padding: 28px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.cs-comparison__col--before {
    background: rgba(239, 68, 68, 0.05);
    border-color: rgba(239, 68, 68, 0.15);
}

.cs-comparison__col--after {
    background: rgba(34, 197, 94, 0.05);
    border-color: rgba(34, 197, 94, 0.15);
}

.cs-comparison__label {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 16px;
}

.cs-comparison__col--before .cs-comparison__label {
    color: #ef4444;
}

.cs-comparison__col--after .cs-comparison__label {
    color: #22c55e;
}

.cs-comparison__item {
    font-size: 14px;
    color: var(--text-secondary);
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 8px;
}

.cs-comparison__item:last-child {
    border-bottom: none;
}

.cs-comparison__item strong {
    color: var(--text-primary);
}

/* --- Testimonial --- */
.cs-testimonial {
    margin: 32px 0;
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius-sm);
}

.cs-testimonial__quote {
    font-family: var(--font-serif);
    font-size: 18px;
    font-style: italic;
    color: var(--text-primary);
    line-height: 1.6;
    margin-bottom: 16px;
}

.cs-testimonial__quote::before {
    content: '"';
    color: var(--accent);
    font-size: 32px;
    font-weight: 700;
    margin-right: 4px;
}

.cs-testimonial__author {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
}

.cs-testimonial__role {
    font-size: 13px;
    color: var(--text-muted);
}

/* --- CTA Urgency --- */
.cs-cta__urgency {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(34, 197, 94, 0.08);
    border: 1px solid rgba(34, 197, 94, 0.2);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 500;
    color: #22c55e;
    margin-bottom: 24px;
}

.cs-cta__urgency-dot {
    width: 8px;
    height: 8px;
    background: #22c55e;
    border-radius: 50%;
    animation: cs-pulse 2s infinite;
}

@keyframes cs-pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.4;
    }
}

.cs-cta__note {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 20px;
}

/* --- Live Button --- */
.cs-live-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    background: transparent;
    color: var(--accent);
    font-family: var(--font-sans);
    font-size: 14px;
    font-weight: 600;
    border: 1px solid var(--accent);
    border-radius: 100px;
    text-decoration: none;
    transition: all 0.3s;
    margin-left: 12px;
}

.cs-live-btn:hover {
    background: var(--accent-glow);
    color: var(--accent-light);
    transform: translateY(-2px);
}

.cs-cta__buttons {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

/* --- ROI Box --- */
.cs-roi {
    margin: 40px 0;
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--accent-glow-strong);
    border-radius: var(--radius);
}

.cs-roi h3 {
    font-family: var(--font-serif);
    font-size: 22px;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 24px;
    margin-top: 0;
    text-align: center;
}

.cs-roi__grid {
    display: flex;
    align-items: center;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.cs-roi__item {
    flex: 1;
    min-width: 200px;
    padding: 24px;
    border-radius: var(--radius-sm);
    text-align: center;
}

.cs-roi__item--before {
    background: rgba(239, 68, 68, 0.06);
    border: 1px solid rgba(239, 68, 68, 0.15);
}

.cs-roi__item--after {
    background: rgba(34, 197, 94, 0.06);
    border: 1px solid rgba(34, 197, 94, 0.15);
}

.cs-roi__label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.cs-roi__value {
    font-family: var(--font-serif);
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

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

.cs-roi__vs {
    font-family: var(--font-serif);
    font-size: 20px;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.cs-roi__bottom {
    text-align: center;
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 20px;
    margin-bottom: 0;
    font-style: italic;
}

/* --- Dogfooding Callout --- */
.cs-dogfood {
    background: var(--accent-glow);
    border: 1px solid rgba(201, 168, 76, 0.2);
    border-radius: var(--radius-sm);
    padding: 16px 20px;
    font-size: 14px;
    color: var(--text-secondary) !important;
    margin: 20px 0;
}

.cs-dogfood strong {
    color: var(--accent) !important;
}

/* --- Footer --- */
.cs-footer {
    padding: 24px 40px;
    border-top: 1px solid var(--border);
    text-align: center;
}

.cs-footer p {
    font-size: 13px;
    color: var(--text-muted);
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .cs-nav {
        padding: 16px 24px;
    }

    .cs-hero {
        padding: 120px 24px 60px;
    }

    .cs-section {
        padding: 48px 24px;
    }

    .cs-cta {
        padding: 60px 24px;
    }

    .cs-footer {
        padding: 20px 24px;
    }

    .cs-hero__meta {
        gap: 20px;
    }

    .cs-timeline__item {
        flex-direction: column;
        gap: 8px;
    }

    .cs-timeline__week {
        width: auto;
    }

    .cs-comparison {
        grid-template-columns: 1fr;
    }

    .cs-roi__grid {
        flex-direction: column;
    }

    .cs-roi__item {
        min-width: unset;
        width: 100%;
    }
}