/* ====================================
   Stremzy - Landing Page
   Dark minimal premium design
   ==================================== */

:root {
    --black: #000000;
    --black-soft: #0a0a0a;
    --black-card: #111111;
    --black-light: #1a1a1a;
    --white: #ffffff;
    --white-soft: #f5f5f5;
    --gray: #888888;
    --gray-dark: #444444;
    --gray-light: #cccccc;
    --accent: #ffffff;
    --error: #dc2626;
    --success: #16a34a;
    --warning: #f59e0b;
    --info: #3b82f6;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--black);
    color: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ============================================
   Background gradient
   ============================================ */
.bg-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse at 0% 0%, rgba(255,255,255,0.03) 0%, transparent 50%),
        radial-gradient(ellipse at 100% 100%, rgba(255,255,255,0.02) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* ============================================
   Header
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 16px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: transparent;
    transition: background 0.3s ease, border-color 0.3s ease;
}

.header.scrolled {
    background: rgba(0, 0, 0, 0.95);
    border-bottom: 1px solid rgba(255,255,255,0.08);
    backdrop-filter: blur(12px);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--white);
}

.logo-icon {
    width: 38px;
    height: 38px;
    background: var(--white);
    color: var(--black);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
}

.logo-text {
    font-size: 22px;
    font-weight: 800;
    letter-spacing: -0.5px;
}

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

.nav-link {
    color: var(--gray-light);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--white);
}

/* Mobile menu toggle */
.mobile-menu-btn {
    display: none;
    background: none;
    border: 1px solid rgba(255,255,255,0.2);
    color: var(--white);
    width: 40px;
    height: 40px;
    cursor: pointer;
    font-size: 18px;
    align-items: center;
    justify-content: center;
    transition: border-color 0.3s ease;
}

.mobile-menu-btn:hover {
    border-color: rgba(255,255,255,0.5);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 11px 24px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
}

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

.btn-primary:hover {
    background: var(--gray-light);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 1px solid rgba(255,255,255,0.25);
}

.btn-outline:hover {
    border-color: var(--white);
    background: rgba(255,255,255,0.05);
}

.btn-large {
    padding: 16px 36px;
    font-size: 15px;
}

.btn-full {
    width: 100%;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 40px 80px;
    position: relative;
}

.hero-content {
    max-width: 720px;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 32px;
}

.hero-title {
    font-size: clamp(36px, 7vw, 64px);
    font-weight: 900;
    line-height: 1.08;
    letter-spacing: -2px;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 17px;
    color: var(--gray);
    max-width: 480px;
    margin: 0 auto 36px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-scroll {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--gray-dark);
    font-size: 20px;
    animation: bounce 2s infinite;
    text-decoration: none;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

/* ============================================
   Sections (shared)
   ============================================ */
section {
    padding: 80px 40px;
    position: relative;
    z-index: 1;
}

.section-header {
    text-align: center;
    max-width: 560px;
    margin: 0 auto 48px;
}

.section-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--gray);
    margin-bottom: 14px;
}

.section-title {
    font-size: 32px;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 14px;
}

.section-desc {
    color: var(--gray);
    font-size: 15px;
    line-height: 1.7;
}

.section-alt {
    background: var(--black-soft);
}

/* ============================================
   Features Grid
   ============================================ */
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    max-width: 1100px;
    margin: 0 auto;
}

.feature-card {
    padding: 32px 24px;
    background: var(--black-card);
    border: 1px solid rgba(255,255,255,0.08);
    transition: border-color 0.3s ease;
}

.feature-card:hover {
    border-color: rgba(255,255,255,0.2);
}

.feature-icon {
    width: 44px;
    height: 44px;
    background: var(--white);
    color: var(--black);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    margin-bottom: 20px;
}

.feature-title {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 10px;
}

.feature-desc {
    color: var(--gray);
    font-size: 13px;
    line-height: 1.7;
}

/* ============================================
   Pricing Grid
   ============================================ */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    max-width: 720px;
    margin: 0 auto;
}

.pricing-card {
    padding: 36px 32px;
    background: var(--black-card);
    border: 1px solid rgba(255,255,255,0.08);
    text-align: center;
    position: relative;
    display: flex;
    flex-direction: column;
}

.pricing-card.featured {
    border-color: var(--white);
}

.pricing-card.featured::before {
    content: 'POPULAIRE';
    position: absolute;
    top: -1px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--white);
    color: var(--black);
    padding: 5px 18px;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 1px;
}

.pricing-name {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--gray);
    margin-bottom: 12px;
}

.pricing-price {
    font-size: 44px;
    font-weight: 800;
    margin-bottom: 4px;
    letter-spacing: -1px;
}

.pricing-price span {
    font-size: 15px;
    font-weight: 400;
    color: var(--gray);
}

.pricing-period {
    font-size: 13px;
    color: var(--gray);
    margin-bottom: 28px;
}

.pricing-features {
    list-style: none;
    margin-bottom: 28px;
    flex: 1;
}

.pricing-features li {
    padding: 10px 0;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    font-size: 13px;
    color: var(--gray-light);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.pricing-features li i {
    color: var(--white);
    font-size: 11px;
}

.pricing-features li:last-child {
    border-bottom: none;
}

/* ============================================
   Steps (How it works)
   ============================================ */
.steps-container {
    display: flex;
    justify-content: center;
    gap: 48px;
    max-width: 900px;
    margin: 0 auto;
    flex-wrap: wrap;
}

.step {
    text-align: center;
    max-width: 250px;
    flex: 1;
    min-width: 200px;
}

.step-number {
    width: 52px;
    height: 52px;
    border: 2px solid var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    font-weight: 800;
    margin: 0 auto 20px;
}

.step-title {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 10px;
}

.step-desc {
    color: var(--gray);
    font-size: 13px;
    line-height: 1.7;
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
    text-align: center;
    padding: 100px 40px;
    background: linear-gradient(180deg, transparent 0%, rgba(255,255,255,0.02) 100%);
}

.cta-title {
    font-size: 36px;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 14px;
}

.cta-desc {
    color: var(--gray);
    font-size: 16px;
    margin-bottom: 36px;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: 40px;
    border-top: 1px solid rgba(255,255,255,0.08);
}

.footer-content {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-copy {
    color: var(--gray);
    font-size: 13px;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--gray);
    text-decoration: none;
    font-size: 13px;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--white);
}

/* ============================================
   Responsive — Tablet (max 1024px)
   ============================================ */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ============================================
   Responsive — Mobile (max 768px)
   ============================================ */
@media (max-width: 768px) {
    .header {
        padding: 14px 20px;
    }

    .header-nav .nav-link {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    /* Mobile menu expanded */
    .header-nav.open {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.97);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 24px;
        z-index: 200;
    }

    .header-nav.open .nav-link {
        display: block;
        font-size: 18px;
    }

    .header-nav.open .btn {
        width: 200px;
        justify-content: center;
    }

    .hero {
        padding: 100px 20px 60px;
        min-height: auto;
        min-height: 90vh;
    }

    .hero-title {
        font-size: 32px;
        letter-spacing: -1px;
    }

    .hero-subtitle {
        font-size: 15px;
    }

    .hero-scroll {
        display: none;
    }

    section {
        padding: 48px 20px;
    }

    .section-title {
        font-size: 24px;
    }

    .section-header {
        margin-bottom: 32px;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .feature-card {
        padding: 24px 20px;
        display: flex;
        align-items: flex-start;
        gap: 16px;
    }

    .feature-icon {
        margin-bottom: 0;
        flex-shrink: 0;
    }

    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 360px;
    }

    .pricing-card {
        padding: 28px 24px;
    }

    .pricing-price {
        font-size: 36px;
    }

    .steps-container {
        flex-direction: column;
        align-items: center;
        gap: 32px;
    }

    .step {
        max-width: 100%;
    }

    .cta-section {
        padding: 60px 20px;
    }

    .cta-title {
        font-size: 28px;
    }

    .footer {
        padding: 28px 20px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
    }
}

/* ============================================
   Responsive — Small mobile (max 480px)
   ============================================ */
@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .hero-buttons .btn {
        width: 100%;
        max-width: 280px;
    }

    .btn-large {
        padding: 14px 28px;
        font-size: 14px;
    }

    .step-number {
        width: 44px;
        height: 44px;
        font-size: 18px;
    }

    .feature-card {
        padding: 20px 16px;
    }

    .feature-icon {
        width: 38px;
        height: 38px;
        font-size: 16px;
    }
}