/* ========================================
   StaffIA — Landing Page Styles
   Modern, clean, professional design
   ======================================== */

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

:root {
    --color-bg: #09090b;
    --color-surface: #111113;
    --color-surface-2: #18181b;
    --color-surface-3: #1f1f23;
    --color-border: #27272a;
    --color-border-light: #3f3f46;
    --color-text: #fafafa;
    --color-text-secondary: #a1a1aa;
    --color-text-muted: #71717a;
    --color-primary: #6366f1;
    --color-primary-light: #818cf8;
    --color-primary-dark: #4f46e5;
    --color-accent: #a78bfa;
    --color-gradient-1: #6366f1;
    --color-gradient-2: #8b5cf6;
    --color-gradient-3: #a78bfa;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
    --transition: 0.15s ease;
}

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

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

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

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

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

/* --- Navigation --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
    background: transparent;
}

.nav--scrolled {
    background: rgba(9, 9, 11, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    padding: 12px 0;
}

.nav__container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav__logo {
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav__logo-icon {
    color: var(--color-primary);
    font-size: 0.9em;
}

.nav__logo-accent {
    background: linear-gradient(135deg, var(--color-gradient-1), var(--color-gradient-3));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav__links {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav__links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition);
    position: relative;
}

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

.nav__links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition);
    border-radius: 1px;
}

.nav__links a:hover::after {
    width: 100%;
}

.nav__cta {
    font-size: 0.875rem;
    font-weight: 600;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    background: var(--color-primary);
    color: white;
    transition: all var(--transition);
}

.nav__cta:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
}

.nav__mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav__mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: var(--transition);
}

.nav__mobile-menu {
    display: none;
    list-style: none;
    padding: 16px 24px 24px;
    background: rgba(9, 9, 11, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav__mobile-menu.active {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.nav__mobile-menu a {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.nav__cta--mobile {
    display: inline-block;
    text-align: center;
    margin-top: 8px;
}

/* --- Hero --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero__bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero__grid-pattern {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 70%);
}

.hero__gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.15;
}

.hero__gradient-orb--1 {
    width: 600px;
    height: 600px;
    background: var(--color-gradient-1);
    top: -200px;
    right: -100px;
}

.hero__gradient-orb--2 {
    width: 400px;
    height: 400px;
    background: var(--color-gradient-2);
    bottom: -100px;
    left: -100px;
}

.hero__container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 100px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-primary-light);
    margin-bottom: 32px;
}

.hero__badge-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-primary);
    animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.hero__title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.hero__title-gradient {
    background: linear-gradient(135deg, var(--color-gradient-1), var(--color-gradient-2), var(--color-gradient-3));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__subtitle {
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--color-text-secondary);
    max-width: 680px;
    margin: 0 auto 40px;
}

.hero__actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 64px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    font-weight: 600;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    white-space: nowrap;
}

.btn--primary {
    background: var(--color-primary);
    color: white;
}

.btn--primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.35);
}

.btn--outline {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border-light);
}

.btn--outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary-light);
    transform: translateY(-2px);
}

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

/* Hero Stats */
.hero__stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
}

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

.hero__stat-number {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--color-text);
}

.hero__stat-suffix {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--color-primary-light);
}

.hero__stat-label {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: 4px;
}

.hero__stat-divider {
    width: 1px;
    height: 48px;
    background: var(--color-border);
}

/* --- Section Common --- */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-primary-light);
    margin-bottom: 16px;
}

.section-tag--light {
    color: rgba(255,255,255,0.7);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* --- Expertises --- */
.expertises {
    padding: 120px 0;
    position: relative;
}

.expertises__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.expertise-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.expertise-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
    opacity: 0;
    transition: opacity var(--transition);
}

.expertise-card:hover {
    border-color: var(--color-border-light);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

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

.expertise-card__icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: rgba(99, 102, 241, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary-light);
    margin-bottom: 20px;
}

.expertise-card__title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.expertise-card__desc {
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
    margin-bottom: 20px;
}

.expertise-card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    list-style: none;
}

.expertise-card__tags li {
    padding: 4px 12px;
    border-radius: 100px;
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
}

/* --- Solutions --- */
.solutions {
    padding: 120px 0;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.solutions__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.solution-card {
    padding: 32px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    transition: all var(--transition);
}

.solution-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(99, 102, 241, 0.1);
}

.solution-card__number {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: 16px;
}

.solution-card__title {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.solution-card__desc {
    font-size: 0.875rem;
    line-height: 1.65;
    color: var(--color-text-secondary);
}

/* --- References --- */
.references {
    padding: 120px 0;
}

.references__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.ref-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    display: flex;
    flex-direction: column;
    transition: all var(--transition);
}

.ref-card:hover {
    border-color: var(--color-border-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.ref-card--featured {
    grid-column: 1 / -1;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(139, 92, 246, 0.05));
    border-color: rgba(99, 102, 241, 0.2);
}

.ref-card__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 12px;
}

.ref-card__meta {
    display: flex;
    align-items: center;
    gap: 12px;
}

.ref-card__year {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-primary-light);
    padding: 4px 10px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-sm);
}

.ref-card__client {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.ref-card__tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.ref-card__tags span {
    padding: 4px 10px;
    border-radius: 100px;
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-muted);
}

.ref-card__title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.ref-card__desc {
    font-size: 0.9375rem;
    line-height: 1.65;
    color: var(--color-text-secondary);
    flex: 1;
}

.ref-card__footer {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--color-border);
}

.ref-card__link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary-light);
    transition: all var(--transition);
}

.ref-card__link:hover {
    color: var(--color-text);
    gap: 10px;
}

.ref-card__status {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    font-style: italic;
}

/* --- Approche --- */
.approche {
    padding: 120px 0;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.approche__layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

.approche__left {
    position: sticky;
    top: 120px;
}

.approche__left .section-title {
    text-align: left;
}

.approche__left .section-desc {
    margin: 0;
}

.approche__steps {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.approche__step {
    display: flex;
    gap: 24px;
    padding: 28px;
    border-radius: var(--radius-lg);
    border: 1px solid transparent;
    transition: all var(--transition);
}

.approche__step:hover {
    background: var(--color-bg);
    border-color: var(--color-border);
}

.approche__step-number {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
    flex-shrink: 0;
    padding-top: 2px;
}

.approche__step-content h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.approche__step-content p {
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
}

/* --- Secteurs --- */
.secteurs {
    padding: 120px 0;
}

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

.secteur-pill {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 24px;
    border-radius: 100px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: all var(--transition);
}

.secteur-pill:hover {
    border-color: var(--color-primary);
    color: var(--color-text);
    transform: translateY(-2px);
}

.secteur-pill svg {
    color: var(--color-primary-light);
    flex-shrink: 0;
}

/* --- Contact --- */
.contact {
    padding: 120px 0;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
}

.contact__card {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(139, 92, 246, 0.04));
    border: 1px solid rgba(99, 102, 241, 0.15);
    border-radius: var(--radius-xl);
    padding: 64px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: start;
}

.contact__title {
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
}

.contact__desc {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text-secondary);
}

.contact__form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact__form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-text-secondary);
}

.form-group input,
.form-group textarea {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    transition: all var(--transition);
    outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* --- Footer --- */
.footer {
    padding: 48px 0;
    border-top: 1px solid var(--color-border);
}

.footer__content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 32px;
}

.footer__tagline {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-top: 8px;
}

.footer__links {
    display: flex;
    gap: 24px;
}

.footer__links a {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    transition: color var(--transition);
}

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

.footer__bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.footer__bottom p {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* --- Animations --- */
[data-animate] {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

[data-animate].visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .expertises__grid {
        grid-template-columns: 1fr;
    }

    .solutions__grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .approche__layout {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .approche__left {
        position: static;
        text-align: center;
    }

    .approche__left .section-title {
        text-align: center;
    }

    .approche__left .section-desc {
        margin: 0 auto;
    }

    .contact__card {
        grid-template-columns: 1fr;
        padding: 40px;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav__links,
    .nav__cta:not(.nav__cta--mobile) {
        display: none;
    }

    .nav__mobile-toggle {
        display: flex;
    }

    .hero {
        padding: 100px 0 60px;
        min-height: auto;
    }

    .hero__subtitle {
        font-size: 1rem;
    }

    .hero__stats {
        gap: 24px;
    }

    .hero__stat-number,
    .hero__stat-suffix {
        font-size: 1.5rem;
    }

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

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

    .contact__form-row {
        grid-template-columns: 1fr;
    }

    .contact__card {
        padding: 28px;
    }

    .footer__content {
        flex-direction: column;
        gap: 24px;
        text-align: center;
    }

    .footer__links {
        flex-wrap: wrap;
        justify-content: center;
    }

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

    .secteur-pill {
        padding: 12px 18px;
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    .hero__actions {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        justify-content: center;
    }

    .hero__stats {
        flex-direction: column;
        gap: 16px;
    }

    .hero__stat-divider {
        width: 48px;
        height: 1px;
    }

    .expertise-card {
        padding: 24px;
    }
}