/* ============================================================
   StepWise Lab — Landing Page Styles
   Premium dark-mode design with subtle animations
   ============================================================ */

/* --- Design Tokens --- */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #16161f;
    --bg-elevated: #1c1c28;
    --bg-hover: #22222f;

    --text-primary: #e8e8ed;
    --text-secondary: #9898a8;
    --text-muted: #6a6a7a;

    --accent: #6366f1;
    --accent-light: #818cf8;
    --accent-glow: rgba(99, 102, 241, 0.15);

    --gradient-start: #6366f1;
    --gradient-mid: #a78bfa;
    --gradient-end: #c084fc;

    --border: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);

    --radius: 12px;
    --radius-lg: 16px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);

    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
    color: var(--text-primary);
}

/* --- Navigation --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 16px 0;
    transition: all var(--transition);
    backdrop-filter: blur(0px);
}

.nav-scrolled {
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
}

.nav-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 16px;
    color: var(--text-primary);
}

.logo-icon {
    color: var(--accent);
    font-size: 18px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav-links a {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition);
}

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

.nav-cta {
    background: var(--accent);
    color: white !important;
    padding: 8px 18px;
    border-radius: 8px;
    font-weight: 600;
    transition: all var(--transition);
}

.nav-cta:hover {
    background: var(--accent-light);
    transform: translateY(-1px);
}

/* --- Hero --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 24px 80px;
    overflow: hidden;
}

.hero-bg-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 20%, transparent 100%);
}

.hero::before {
    content: '';
    position: absolute;
    top: -30%;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 60%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    text-align: center;
    max-width: 800px;
}

.hero-badge {
    display: inline-block;
    background: var(--accent-glow);
    border: 1px solid rgba(99, 102, 241, 0.25);
    color: var(--accent-light);
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-bottom: 24px;
}

.hero h1 {
    font-size: clamp(2.4rem, 6vw, 3.8rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-sub {
    font-size: 17px;
    line-height: 1.7;
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto 36px;
}

.hero-actions {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 56px;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
    transition: all var(--transition);
    border: none;
}

.btn-primary {
    background: var(--accent);
    color: white;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    background: var(--accent-light);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-hover);
}

.btn-secondary:hover {
    background: var(--bg-hover);
    color: white;
    transform: translateY(-2px);
}

/* --- Hero Stats --- */
.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 28px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    margin-top: 4px;
}

.stat-divider {
    width: 1px;
    height: 36px;
    background: var(--border-hover);
}

/* --- Sections --- */
.section {
    padding: 100px 24px;
}

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

.section-inner {
    max-width: 1100px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--accent-light);
    margin-bottom: 12px;
}

.section-header h2 {
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 14px;
}

.section-desc {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.6;
}

/* --- Card Grid (Methodology) --- */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: all var(--transition);
}

.card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
}

.card-icon {
    font-size: 28px;
    margin-bottom: 16px;
}

.card h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 10px;
}

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

/* Stagger animation for methodology cards */
.card-grid .card:nth-child(2) {
    transition-delay: 0.1s;
}

.card-grid .card:nth-child(3) {
    transition-delay: 0.2s;
}

.card-grid .card:nth-child(4) {
    transition-delay: 0.3s;
}

/* --- Capabilities --- */
.capabilities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 16px;
    max-width: 800px;
    margin: 0 auto;
}

.capability {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px;
    transition: all var(--transition);
}

.capability:hover {
    border-color: var(--accent);
    box-shadow: 0 0 24px var(--accent-glow);
    transform: translateY(-2px);
}

.capability-icon {
    font-size: 24px;
    flex-shrink: 0;
    margin-top: 2px;
}

.capability-content {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.capability-content strong {
    font-size: 15px;
    font-weight: 700;
}

.capability-content span {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Stagger animation for capabilities */
.capabilities-grid .capability:nth-child(2) {
    transition-delay: 0.08s;
}

.capabilities-grid .capability:nth-child(3) {
    transition-delay: 0.16s;
}

.capabilities-grid .capability:nth-child(4) {
    transition-delay: 0.24s;
}

.capabilities-grid .capability:nth-child(5) {
    transition-delay: 0.32s;
}

.capabilities-grid .capability:nth-child(6) {
    transition-delay: 0.4s;
}

/* --- Impact Section --- */
.impact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.impact-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    text-align: center;
    transition: all var(--transition);
}

.impact-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
}

.impact-number {
    font-size: 22px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.impact-card p {
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-secondary);
}

.impact-card em {
    color: var(--text-primary);
    font-style: italic;
}

.impact-value {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
    font-style: italic;
    margin-top: 12px;
    line-height: 1.5;
}

/* Stagger animation for impact cards */
.impact-grid .impact-card:nth-child(2) {
    transition-delay: 0.1s;
}

.impact-grid .impact-card:nth-child(3) {
    transition-delay: 0.2s;
}

/* --- About Section --- */
.about-content {
    max-width: 680px;
    margin: 0 auto;
    text-align: center;
}

.about-content h2 {
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 24px;
}

.about-content p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.about-content p:last-child {
    margin-bottom: 0;
}

.about-content em {
    color: var(--accent-light);
    font-style: italic;
}

.about-content strong {
    color: var(--text-primary);
}

/* --- Contact --- */
.contact-section {
    text-align: center;
}

.contact-links {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 28px;
}

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

.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-logo {
    font-weight: 700;
    font-size: 14px;
    color: var(--text-muted);
}

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

/* --- Animations --- */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .nav-links {
        gap: 16px;
    }

    .nav-links a:not(.nav-cta) {
        display: none;
    }

    .hero {
        padding: 100px 20px 60px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-stats {
        gap: 20px;
    }

    .stat-divider {
        display: none;
    }

    .section {
        padding: 64px 20px;
    }

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

    .footer-inner {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .contact-links {
        flex-direction: column;
        align-items: center;
    }
}