/* ==========================================================================
CSS VARIABLES - DESIGN SYSTEM
========================================================================== */
:root {
    /* Colors */
    --color-primary: #E53935;
    --color-primary-dark: #C62828;
    --color-secondary: #1E3A8A;
    --color-accent: #3B82F6;
    --color-light: #F5F5F5;
    --color-dark: #1F1F1F;
    --color-white: #FFFFFF;
    
    /* Typography */
    --font-family: 'Poppins', sans-serif;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 700;
    
    /* Desktop Typography */
    --font-size-headline: 48px;
    --font-size-subheadline: 24px;
    --font-size-paragraph: 18px;
    --font-size-button: 16px;
    --font-size-nav: 16px;
    
    /* Mobile Typography */
    --font-size-headline-mobile: 32px;
    --font-size-subheadline-mobile: 20px;
    --font-size-paragraph-mobile: 16px;
    --font-size-nav-mobile: 14px;
    
    /* Spacing */
    --spacing-base: 1rem;
    --spacing-section: 4rem;
    --spacing-grid: 2rem;
    --border-radius: 12px;
    --box-shadow: 0 4px 10px rgba(0,0,0,0.08);
    --box-shadow-hover: 0 8px 25px rgba(0,0,0,0.15);
    
    /* Neumorphism shadows */
    --shadow-neumorphic: 8px 8px 16px rgba(163, 177, 198, 0.6), -8px -8px 16px rgba(255, 255, 255, 0.5);
    --shadow-neumorphic-inset: inset 4px 4px 8px rgba(163, 177, 198, 0.3), inset -4px -4px 8px rgba(255, 255, 255, 0.7);
}

/* ==========================================================================
    RESET & BASE STYLES
    ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;

    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

body {
    font-family: var(--font-family);
    font-weight: var(--font-weight-regular);
    color: var(--color-dark);
    line-height: 1.6;
    background-color: var(--color-light);

    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ==========================================================================
    TYPOGRAPHY CLASSES
    ========================================================================== */
.headline {
    font-size: var(--font-size-headline);
    font-weight: var(--font-weight-bold);
    color: var(--color-dark);
    line-height: 1.2;
    margin-bottom: var(--spacing-base);
}

.subheadline {
    font-size: var(--font-size-subheadline);
    font-weight: var(--font-weight-medium);
    color: var(--color-dark);
    margin-bottom: var(--spacing-base);
}

.paragraph {
    font-size: var(--font-size-paragraph);
    font-weight: var(--font-weight-regular);
    color: var(--color-dark);
    margin-bottom: var(--spacing-base);
}

/* ==========================================================================
    LAYOUT UTILITIES
    ========================================================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-base);
}

.section {
    padding: var(--spacing-section) 0;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-grid);
    align-items: center;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-grid);
}

.text-center {
    text-align: center;
}

.text-white {
    color: var(--color-white);
}

/* ==========================================================================
    BUTTONS
    ========================================================================== */
.btn {
    display: inline-block;
    padding: 14px 28px;
    font-size: var(--font-size-button);
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: var(--color-white);
    box-shadow: var(--shadow-neumorphic);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-primary-dark), #B71C1C);
    box-shadow: var(--box-shadow-hover);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--color-light);
    color: var(--color-dark);
    box-shadow: var(--shadow-neumorphic);
}

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

/* ==========================================================================
    NAVBAR
    ========================================================================== */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    box-shadow: 0 2px 20px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.navbar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    font-size: var(--font-size-nav);
    font-weight: var(--font-weight-medium);
    color: var(--color-dark);
    text-decoration: none;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

.nav-link.active {
    color: var(--color-primary);
}

.nav-link.active::after {
    width: 100%;
}

/* ==========================================================================
    HERO SECTION
    ========================================================================== */
.hero {
    padding: 8rem 0 6rem;
    margin-top: 80px;
    position: relative;
    overflow: hidden;
}

.hero-content {
    background: linear-gradient(135deg, var(--color-white), var(--color-light)); 
    padding: 15px;
    position: relative;
    z-index: 2;
    box-shadow: var(--shadow-neumorphic);
}

.hero .headline {
    font-size: clamp(32px, 5vw, 48px);
    background: linear-gradient(135deg, var(--color-dark), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1.5rem;
}

.hero .paragraph {
    font-size: 20px;
    margin-bottom: 2rem;
    max-width: 600px;
}

.flame-placeholder {
    width: 150px;
    height: 150px;
    background: url('../images/RusSolutionsIsoLogoNoBg.svg') no-repeat center center;
    background-size: contain;
    border-radius: 50% 50% 50% 50%;
    margin: 2rem auto;
    box-shadow: var(--shadow-neumorphic);
    animation: float 3s ease-in-out infinite;
    position: relative;
}

/* .flame-placeholder::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: var(--color-white);
    border-radius: 50%;
    opacity: 0.8;
} */

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

/* ==========================================================================
    WHATSAPP BUTTON STYLES
    ========================================================================== */
.btn-whatsapp {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: #25D366;
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    transition: all 0.3s ease;
    border: none;
    box-shadow: 0 2px 8px rgba(37, 211, 102, 0.3);
}

.btn-whatsapp:hover {
    background: #20b85a;
    box-shadow: 0 4px 12px rgba(37, 211, 102, 0.4);
    color: white;
    text-decoration: none;
}

.btn-whatsapp::before {
    font-size: 1.1rem;
    margin-right: 0.25rem;
}

.btn-whatsapp span {
    display: inline-block;
    width: 48px;
    height: 48px;
    background: url('../images/icons/whatsapp.png') no-repeat center center;
    background-size: contain;
    margin-right: 0.5rem;
}


/* WhatsApp floating button */
.whatsapp-float {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 60px;
    height: 60px;
    background: #25D366;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(37, 211, 102, 0.4);
    z-index: 1000;
    transition: all 0.3s ease;
    animation: float 3s ease-in-out infinite;
    text-decoration: none;
}

.whatsapp-float:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 25px rgba(37, 211, 102, 0.5);
    text-decoration: none;
}


.whatsapp-float span {
    display: inline-block;
    width: 48px;
    height: 48px;
    background: url('../images/icons/whatsapp.png') no-repeat center center;
    background-size: contain;
}



/* ==========================================================================
    CARDS
    ========================================================================== */
.card {
    background: var(--color-white);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-neumorphic);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow-hover);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.card-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--color-light), #E0E0E0);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-dark);
    font-size: 14px;
    opacity: 0.7;
}

.card h3 {
    font-size: 20px;
    font-weight: var(--font-weight-medium);
    margin-bottom: 0.5rem;
    color: var(--color-secondary);
}

.card p {
    font-size: 16px;
    margin-bottom: 1rem;
    color: var(--color-dark);
    opacity: 0.8;
}

/* ==========================================================================
    SECTIONS
    ========================================================================== */
.intro-section {
    background: var(--color-white);
}


.flame-placeholder {
    width: 150px;
    height: 150px;
    background: url('../images/RusSolutionsIsoLogoNoBg.svg') no-repeat center center;
    background-size: contain;
    border-radius: 50% 50% 50% 50%;
    margin: 2rem auto;
    box-shadow: var(--shadow-neumorphic);
    animation: float 3s ease-in-out infinite;
    position: relative;
}

.intro-icon {
    width: 80px;
    height: 80px;
    /*background: linear-gradient(135deg, var(--color-primary), var(--color-accent));*/
    background: url('../images/RusSolutionsIsoLogoNoBg.svg') no-repeat center center;
    background-size: contain;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
    box-shadow: var(--shadow-neumorphic);
}

.vision-section {
    background: linear-gradient(135deg, var(--color-secondary), #1E40AF);
    color: var(--color-white);
    position: relative;
    overflow: hidden;
}

.vision-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="20" cy="20" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="40" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="40" cy="80" r="1" fill="rgba(255,255,255,0.1)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.vision-content {
    position: relative;
    z-index: 2;
}

.vision-section .subheadline,
.vision-section .paragraph {
    color: var(--color-white);
}

.contact-cta {
    background: linear-gradient(135deg, var(--color-light), #EEEEEE);
    text-align: center;
}

.contact-cta .subheadline {
    font-size: 28px;
    margin-bottom: 2rem;
}

/* ==========================================================================
    FOOTER
    ========================================================================== */
.footer {
    background: var(--color-dark);
    color: var(--color-white);
    padding: 3rem 0 2rem;
    
    margin-top: auto;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 2rem;
    align-items: start;
}

.footer-logo {
    font-size: 20px;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: var(--color-white);
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.footer-links a:hover {
    opacity: 1;
    color: var(--color-primary);
}


.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    margin-top: 2rem;
    padding-top: 1rem;
    text-align: center;
    opacity: 0.6;
}

.mb-3 {
    margin-bottom: 1rem;
}

/* ==========================================================================
    MOBILE MENU STYLES
    ========================================================================== */
/* Mobile menu toggle button */
.mobile-menu-toggle {
    display: none; /* Hidden by default */
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 1001;
    position: relative;
}

.hamburger {
    display: block;
    position: relative;
    width: 24px;
    height: 2px;
    background-color: var(--color-dark);
    transition: all 0.3s ease-in-out;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border-width: 0;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background-color: var(--color-dark);
    transition: all 0.3s ease-in-out;
}

.hamburger::before {
    transform: translateY(-8px);
}

.hamburger::after {
    transform: translateY(8px);
}

/* Mobile menu container */
.mobile-menu-container {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background-color: var(--color-white);
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: right 0.3s ease-in-out;
    padding: 5rem 2rem 2rem;
    overflow-y: auto;
}

/* Mobile menu list */
.mobile-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.mobile-menu li {
    margin-bottom: 1.5rem;
    opacity: 0;
    transform: translateX(20px);
    transition: all 0.3s ease-in-out;
}

.mobile-menu li:nth-child(1) { transition-delay: 0.1s; }
.mobile-menu li:nth-child(2) { transition-delay: 0.15s; }
.mobile-menu li:nth-child(3) { transition-delay: 0.2s; }
.mobile-menu li:nth-child(4) { transition-delay: 0.25s; }
.mobile-menu li:nth-child(5) { transition-delay: 0.3s; }
.mobile-menu li:nth-child(6) { transition-delay: 0.35s; }

/* Menu open state */
.mobile-menu-open .mobile-menu-container {
    right: 0;
}

.mobile-menu-open .mobile-menu li {
    opacity: 1;
    transform: translateX(0);
}

/* Animate hamburger to X when menu is open */
.mobile-menu-open .hamburger {
    background-color: transparent;
}

.mobile-menu-open .hamburger::before {
    transform: rotate(45deg);
}

.mobile-menu-open .hamburger::after {
    transform: rotate(-45deg);
}

/* Overlay when menu is open */
.mobile-menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.mobile-menu-open .mobile-menu-overlay {
    display: block;
    opacity: 1;
}

/* Hide mobile menu on desktop */
.mobile-menu-container,
.mobile-menu-overlay {
    display: none;
}

/* Hide mobile menu toggle on desktop */
.mobile-menu-toggle {
    display: none;
}

/* ==========================================================================
    RESPONSIVE DESIGN - MOBILE FIRST
    ========================================================================== */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }

    .section {
        padding: 3rem 0;
    }

    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .navbar {
        padding: 0.5rem 0;
    }

    /* Show mobile menu toggle */
    .mobile-menu-toggle {
        display: block;
    }

    /* Show mobile menu container */
    .mobile-menu-container,
    .mobile-menu-overlay {
        display: block;
    }

    /* Hide desktop menu on mobile */
    .desktop-menu {
        display: none;
    }

    /* Mobile menu styles */
    .mobile-menu-container {
        padding-top: 70px; /* Space for the header */
    }

    .mobile-menu li {
        margin: 1.5rem 0;
        text-align: right;
    }

    .mobile-menu .nav-link {
        font-size: 1.2rem;
        padding: 0.5rem 0;
        display: inline-block;
        width: 100%;
        text-align: right;
    }

    .hero {
        padding: 6rem 0 4rem;
        text-align: center;
    }

    .hero .headline {
        font-size: var(--font-size-headline-mobile);
    }

    .hero .paragraph {
        font-size: var(--font-size-paragraph-mobile);
    }

    .subheadline {
        font-size: var(--font-size-subheadline-mobile);
    }

    .paragraph {
        font-size: var(--font-size-paragraph-mobile);
    }

    .nav-link {
        font-size: var(--font-size-nav-mobile);
    }

    .flame-placeholder {
        width: 100px;
        height: 100px;
    }

    .card {
        padding: 1.5rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

    .contact-cta .subheadline {
        font-size: 24px;
    }
    
    .md\:left-align {
       text-align: left;
    }

    .md\:ml-30 {
        margin-left: 30px;
    }

}

@media (max-width: 480px) {
    .btn {
        padding: 12px 24px;
        font-size: 14px;
    }

    .hero {
        padding: 5rem 0 3rem;
    }

    .section {
        padding: 2rem 0;
    }
}

/* ==========================================================================
    ACCESSIBILITY ENHANCEMENTS
    ========================================================================== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
.btn:focus,
.nav-link:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --box-shadow: 0 2px 8px rgba(0,0,0,0.3);
        --shadow-neumorphic: 0 4px 12px rgba(0,0,0,0.2);
    }
}