/* ============================================================
   CASE STUDY PAGE — PREMIUM EDITION
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ── Reset & Base ── */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --red: #ff004f;
    --red-soft: rgba(255, 0, 79, 0.12);
    --red-glow: rgba(255, 0, 79, 0.25);
    --bg: #080808;
    --bg2: #0f0f0f;
    --bg3: #141414;
    --border: rgba(255, 255, 255, 0.07);
    --border-r: rgba(255, 0, 79, 0.25);
    --text: #f0f0f0;
    --muted: #888;
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Navigation ── */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 5%;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    background: transparent;
}

nav.scrolled {
    background: rgba(8, 8, 8, 0.88);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    padding: 14px 5%;
    border-bottom: 1px solid rgba(255, 0, 79, 0.08);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}

/* ── Logo (badge + wordmark) ── */
.cs-logo-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    cursor: pointer;
    transition: transform 0.35s ease;
    flex-shrink: 0;
}

.cs-logo-link:hover {
    transform: scale(1.04);
}

.cs-logo-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 9px;
    background: linear-gradient(135deg, #ff004f, #ff6b6b);
    box-shadow: 0 0 14px rgba(255, 0, 79, 0.4), 0 0 0 1px rgba(255, 0, 79, 0.25);
    font-size: 12px;
    font-weight: 800;
    color: #fff;
    letter-spacing: 0.5px;
    font-family: 'Inter', 'Poppins', sans-serif;
    position: relative;
    overflow: hidden;
    transition: box-shadow 0.3s ease;
    flex-shrink: 0;
}

.cs-logo-badge::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -60%;
    width: 60%;
    height: 200%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
    transform: skewX(-15deg);
    animation: csLogoShine 4s ease-in-out infinite;
}

@keyframes csLogoShine {
    0% {
        left: -60%;
        opacity: 0;
    }

    30% {
        opacity: 1;
    }

    60% {
        left: 120%;
        opacity: 0;
    }

    100% {
        left: 120%;
        opacity: 0;
    }
}

.cs-logo-link:hover .cs-logo-badge {
    box-shadow: 0 0 24px rgba(255, 0, 79, 0.6), 0 0 0 1px rgba(255, 0, 79, 0.35);
}

.cs-logo-wordmark {
    display: flex;
    flex-direction: column;
    line-height: 1;
}

.cs-logo-name {
    font-size: 18px;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #fff 40%, rgba(255, 0, 79, 0.8) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-family: 'Inter', 'Poppins', sans-serif;
}

.cs-logo-sub {
    font-size: 9px;
    font-weight: 500;
    letter-spacing: 2.5px;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.35);
    font-family: 'Inter', sans-serif;
    margin-top: 2px;
}

/* ── Nav Links ── */
nav ul {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 6px;
    margin: 0;
    padding: 0;
}

nav ul li a {
    color: rgba(255, 255, 255, 0.72);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: 8px;
    position: relative;
    transition: all 0.3s ease;
    display: inline-block;
    letter-spacing: 0.3px;
}

nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 14px;
    right: 14px;
    height: 1.5px;
    background: linear-gradient(90deg, var(--red), #ff6b6b);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 2px;
}

nav ul li a:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.05);
}

nav ul li a:hover::after {
    transform: scaleX(1);
}

/* Mobile hamburger */
nav .fa-bars,
nav .fa-times {
    color: #fff;
    font-size: 22px;
    cursor: pointer;
    display: none;
    transition: color 0.3s ease;
}

nav .fa-bars:hover {
    color: var(--red);
}

@media (max-width: 800px) {
    nav .fa-bars {
        display: block;
    }

    nav ul {
        position: fixed;
        top: 0;
        right: -280px;
        width: 280px;
        height: 100vh;
        background: rgba(10, 6, 16, 0.96);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: flex-start;
        padding-top: 80px;
        gap: 4px;
        transition: right 0.45s cubic-bezier(0.4, 0, 0.2, 1);
        border-left: 1px solid var(--border-r);
        box-shadow: -4px 0 24px rgba(0, 0, 0, 0.5);
        z-index: 1000;
    }

    nav ul li {
        width: 100%;
    }

    nav ul li a {
        display: block;
        padding: 14px 28px;
        font-size: 16px;
        border-radius: 0;
    }

    nav ul li a::after {
        left: 28px;
        right: 28px;
    }

    nav .fa-times {
        display: block;
        position: absolute;
        top: 22px;
        right: 22px;
    }
}



/* ── Reset & Base ── */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --red: #ff004f;
    --red-soft: rgba(255, 0, 79, 0.12);
    --red-glow: rgba(255, 0, 79, 0.25);
    --bg: #080808;
    --bg2: #0f0f0f;
    --bg3: #141414;
    --border: rgba(255, 255, 255, 0.07);
    --border-r: rgba(255, 0, 79, 0.25);
    --text: #f0f0f0;
    --muted: #888;
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: auto !important;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    line-height: 1.7;
    overflow-x: hidden;
}

/* ── Progress Bar ── */
#cs-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: linear-gradient(90deg, var(--red), #ff6b6b);
    z-index: 9999;
    transition: width 0.1s linear;
    box-shadow: 0 0 10px var(--red-glow);
}

/* ── Back Button ── */
.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--muted);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.5px;
    padding: 10px 20px;
    border: 1px solid var(--border);
    border-radius: 50px;
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(8px);
    transition: var(--transition);
    margin-bottom: 48px;
}

.back-btn i {
    transition: transform var(--transition);
}

.back-btn:hover {
    color: #fff;
    border-color: var(--border-r);
    background: var(--red-soft);
    box-shadow: 0 0 20px var(--red-glow);
}

.back-btn:hover i {
    transform: translateX(-4px);
}

/* ── Hero Section ── */
.cs-hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 140px 0 80px;
    overflow: hidden;
}

.cs-hero::before {
    content: '';
    position: absolute;
    top: -200px;
    left: 50%;
    transform: translateX(-50%);
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(255, 0, 79, 0.08) 0%, transparent 65%);
    pointer-events: none;
    animation: pulseGlow 6s ease-in-out infinite;
}

@keyframes pulseGlow {

    0%,
    100% {
        opacity: 0.6;
        transform: translateX(-50%) scale(1);
    }

    50% {
        opacity: 1;
        transform: translateX(-50%) scale(1.1);
    }
}

/* Grid lines decoration */
.cs-hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
}

.cs-hero-inner {
    position: relative;
    z-index: 2;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 40px;
}

/* Tag / Category pill */
.cs-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--red-soft);
    color: var(--red);
    border: 1px solid var(--border-r);
    border-radius: 50px;
    padding: 6px 18px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 28px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 0.6s 0.2s forwards;
}

.cs-tag i {
    font-size: 11px;
}

/* Hero title */
.cs-hero h1 {
    font-size: clamp(38px, 6vw, 76px);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -2px;
    margin-bottom: 24px;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp 0.7s 0.35s forwards;
}

.cs-hero h1 span {
    background: linear-gradient(135deg, #fff 40%, var(--red));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Hero description */
.cs-hero p.cs-desc {
    font-size: 18px;
    color: var(--muted);
    max-width: 620px;
    line-height: 1.8;
    margin-bottom: 40px;
    opacity: 0;
    transform: translateY(25px);
    animation: fadeUp 0.7s 0.5s forwards;
}

/* Hero meta row */
.cs-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 32px;
    padding: 28px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    margin-bottom: 48px;
    opacity: 0;
    animation: fadeUp 0.7s 0.65s forwards;
}

.cs-meta-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.cs-meta-item .label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--muted);
    font-weight: 600;
}

.cs-meta-item .value {
    font-size: 15px;
    font-weight: 600;
    color: #fff;
}

/* Hero actions */
.cs-hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    opacity: 0;
    animation: fadeUp 0.7s 0.8s forwards;
}

/* ── Hero Image ── */
.cs-hero-image {
    position: relative;
    max-width: 1100px;
    margin: 0 auto 80px;
    padding: 0 40px;
    opacity: 0;
    transform: translateY(40px);
    animation: fadeUp 0.9s 0.9s forwards;
}

.cs-hero-image .img-wrapper {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid var(--border);
    box-shadow:
        0 0 0 1px rgba(255, 0, 79, 0.1),
        0 40px 80px rgba(0, 0, 0, 0.6),
        0 0 60px rgba(255, 0, 79, 0.08);
}

.cs-hero-image img {
    width: 100%;
    height: 480px;
    object-fit: cover;
    display: block;
    transition: transform 0.8s ease;
}

.cs-hero-image:hover img {
    transform: scale(1.03);
}

/* Image overlay shine */
.cs-hero-image .img-wrapper::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom,
            transparent 60%,
            rgba(8, 8, 8, 0.7) 100%);
    pointer-events: none;
}

/* ── Main Content ── */
.cs-content {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 40px 120px;
}

/* ── Section Titles ── */
.cs-section-title {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 32px;
}

.cs-section-title .icon-box {
    width: 42px;
    height: 42px;
    background: var(--red-soft);
    border: 1px solid var(--border-r);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--red);
    font-size: 16px;
    flex-shrink: 0;
}

.cs-section-title h2 {
    font-size: 22px;
    font-weight: 700;
    color: #fff;
    letter-spacing: -0.5px;
}

/* ── Bento Grid Layout ── */
.cs-bento {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 20px;
    margin-bottom: 20px;
}

/* ── Glass Card ── */
.cs-card {
    background: linear-gradient(135deg, var(--bg3) 0%, var(--bg2) 100%);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
    opacity: 0;
    transform: translateY(30px);
}

.cs-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.cs-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-r), transparent);
    opacity: 0;
    transition: opacity var(--transition);
}

.cs-card:hover {
    border-color: var(--border-r);
    box-shadow: 0 8px 40px rgba(255, 0, 79, 0.1), 0 0 0 1px rgba(255, 0, 79, 0.05);
    transform: translateY(-4px);
}

.cs-card:hover::before {
    opacity: 1;
}

/* Column spans */
.col-6 {
    grid-column: span 6;
}

.col-12 {
    grid-column: span 12;
}

.col-4 {
    grid-column: span 4;
}

.col-8 {
    grid-column: span 8;
}

/* ── Tech Stack Card ── */
.tech-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 20px;
}

.tech-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.tech-item:hover {
    background: var(--red-soft);
    border-color: var(--border-r);
}

.tech-item .tech-label {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--muted);
    font-weight: 600;
    min-width: 80px;
}

.tech-item .tech-value {
    font-size: 14px;
    font-weight: 500;
    color: #fff;
}

/* ── Features Card ── */
.feature-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-top: 20px;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 14px;
    color: #ccc;
    line-height: 1.6;
}

.feature-item .bullet {
    width: 20px;
    height: 20px;
    background: var(--red-soft);
    border: 1px solid var(--border-r);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 2px;
}

.feature-item .bullet i {
    font-size: 9px;
    color: var(--red);
}

/* ── Architecture Card ── */
.cs-card.arch-card {
    background: linear-gradient(135deg, #0f0f14 0%, #0a0a0f 100%);
}

.arch-text {
    font-size: 15px;
    color: #aaa;
    line-height: 1.9;
    margin-top: 20px;
}

/* ── Impact / Metrics ── */
.metrics-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-top: 20px;
}

.metric-card {
    background: rgba(255, 0, 79, 0.04);
    border: 1px solid rgba(255, 0, 79, 0.12);
    border-radius: var(--radius-sm);
    padding: 18px;
    transition: var(--transition);
}

.metric-card:hover {
    background: var(--red-soft);
    border-color: var(--border-r);
}

.metric-card p {
    font-size: 13px;
    color: #bbb;
    line-height: 1.6;
}

.metric-card p::before {
    content: '↗ ';
    color: var(--red);
    font-weight: 700;
}

/* ── Challenge Card ── */
.challenge-block {
    margin-top: 20px;
}

.challenge-block .ch-row {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
}

.ch-row .ch-badge {
    flex-shrink: 0;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 6px 14px;
    border-radius: 50px;
    height: fit-content;
    margin-top: 2px;
}

.ch-badge.problem {
    background: rgba(255, 100, 60, 0.12);
    color: #ff6b6b;
    border: 1px solid rgba(255, 100, 60, 0.2);
}

.ch-badge.solution {
    background: rgba(60, 220, 140, 0.1);
    color: #3ddc84;
    border: 1px solid rgba(60, 220, 140, 0.2);
}

.ch-row p {
    font-size: 14px;
    color: #bbb;
    line-height: 1.7;
}

/* ── CTA / Actions Card ── */
.cs-actions-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 24px;
    background: linear-gradient(135deg, rgba(255, 0, 79, 0.06) 0%, rgba(255, 0, 79, 0.02) 100%);
    border-color: var(--border-r);
}

.cs-actions-card .cta-left h3 {
    font-size: 22px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 6px;
}

.cs-actions-card .cta-left p {
    font-size: 14px;
    color: var(--muted);
}

.cs-btn-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

/* ── Buttons ── */
.cs-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    letter-spacing: 0.3px;
}

.cs-btn.primary {
    background: linear-gradient(135deg, var(--red), #ff6b6b);
    color: #fff;
    border: none;
    box-shadow: 0 4px 20px rgba(255, 0, 79, 0.35);
}

.cs-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(255, 0, 79, 0.5);
}

.cs-btn.ghost {
    background: rgba(255, 255, 255, 0.04);
    color: #ccc;
    border: 1px solid var(--border);
}

.cs-btn.ghost:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    color: #fff;
    transform: translateY(-2px);
}

/* ── Big number stat (optional) ── */
.cs-stat {
    text-align: center;
    padding: 8px 0;
}

.cs-stat .number {
    font-size: 56px;
    font-weight: 900;
    line-height: 1;
    background: linear-gradient(135deg, #fff, var(--red));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -3px;
}

.cs-stat .unit {
    font-size: 14px;
    color: var(--muted);
    margin-top: 8px;
    font-weight: 500;
}

/* ── Animations ── */
@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Staggered card delay utility classes */
.delay-1 {
    transition-delay: 0.05s;
}

.delay-2 {
    transition-delay: 0.12s;
}

.delay-3 {
    transition-delay: 0.19s;
}

.delay-4 {
    transition-delay: 0.26s;
}

.delay-5 {
    transition-delay: 0.33s;
}

/* ── Scroll-reveal base ── */
.cs-card {
    transition: opacity 0.6s ease, transform 0.6s ease, border-color var(--transition), box-shadow var(--transition);
}

/* ── Cursor Glow (desktop) ── */
.cs-cursor-glow {
    position: fixed;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255, 0, 79, 0.05) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
    transform: translate(-50%, -50%);
    transition: left 0.15s ease, top 0.15s ease;
}

/* ── Responsive ── */
@media (max-width: 960px) {
    .col-6 {
        grid-column: span 12;
    }

    .col-4 {
        grid-column: span 12;
    }

    .col-8 {
        grid-column: span 12;
    }

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

    .cs-actions-card {
        flex-direction: column;
        align-items: flex-start;
    }

    .cs-hero h1 {
        letter-spacing: -1px;
    }
}

@media (max-width: 640px) {

    .cs-hero-inner,
    .cs-hero-image,
    .cs-content {
        padding-left: 20px;
        padding-right: 20px;
    }

    .cs-hero {
        padding: 110px 0 60px;
    }

    .cs-bento {
        gap: 14px;
    }

    .cs-card {
        padding: 22px;
    }

    .cs-hero-image img {
        height: 260px;
    }

    .cs-meta {
        gap: 20px;
    }

    .cs-btn {
        padding: 12px 22px;
        font-size: 13px;
    }
}