/* ============================================
   CAMBIACOIN - CRYPTO EXCHANGE
   Established Professional Design System
   ============================================ */

:root {
    --primary-green: #00ff41;
    --primary-green-dark: #00cc33;
    --primary-green-light: #00ff66;
    --accent-green: rgba(0, 255, 65, 0.08);
    --accent-green-hover: rgba(0, 255, 65, 0.12);
    --black: #000000;
    --black-elevated: #050505;
    --black-light: #0f0f0f;
    --black-lighter: #1a1a1a;
    --gray-dark: #2a2a2a;
    --gray-medium: #404040;
    --gray: #6b6b6b;
    --gray-light: #9a9a9a;
    --gray-lighter: #b8b8b8;
    --white: #ffffff;
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', sans-serif;
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-subtle: 0 1px 3px rgba(0, 0, 0, 0.5);
    --shadow-soft: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-elevated: 0 8px 24px rgba(0, 0, 0, 0.5);
    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-medium: rgba(255, 255, 255, 0.1);
    --glow-subtle: 0 0 20px rgba(0, 255, 65, 0.15);
    --glow-medium: 0 0 30px rgba(0, 255, 65, 0.2);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--black);
    color: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    letter-spacing: -0.01em;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 40px;
}

@media (max-width: 768px) {
    .container {
        padding: 0 24px;
    }
}

/* ============================================
   NAVIGATION
   ============================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-subtle);
    z-index: 1000;
    padding: 1.25rem 0;
    transition: var(--transition);
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo-box {
    width: 44px;
    height: 44px;
    border: 1.5px solid var(--primary-green);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    background: linear-gradient(135deg, var(--accent-green) 0%, transparent 100%);
}

.logo-box:hover {
    border-color: var(--primary-green-light);
    background: linear-gradient(135deg, var(--accent-green-hover) 0%, transparent 100%);
}

.logo-text {
    font-weight: 600;
    font-size: 13px;
    color: var(--primary-green);
    letter-spacing: 0.5px;
}

.brand-name {
    font-weight: 600;
    font-size: 17px;
    color: var(--white);
    letter-spacing: 1px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    align-items: center;
}

.nav-menu a {
    color: var(--gray-light);
    text-decoration: none;
    font-weight: 400;
    font-size: 15px;
    transition: var(--transition-fast);
    position: relative;
}

.nav-menu a:not(.btn-primary):hover {
    color: var(--white);
}

.nav-menu a:not(.btn-primary)::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--primary-green);
    transition: var(--transition);
}

.nav-menu a:not(.btn-primary):hover::after {
    width: 100%;
}

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

.mobile-menu-toggle span {
    width: 24px;
    height: 1.5px;
    background-color: var(--white);
    transition: var(--transition);
}

/* Language Selector */
.lang-selector-wrapper {
    position: relative;
}

.lang-selector {
    position: relative;
    display: inline-block;
}

.lang-current {
    background: none;
    border: 1px solid var(--border-medium);
    color: var(--white);
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    font-family: var(--font-primary);
    min-width: 50px;
    text-align: center;
}

.lang-current:hover {
    border-color: var(--primary-green);
    color: var(--primary-green);
}

.lang-selector.active .lang-current {
    border-color: var(--primary-green);
    color: var(--primary-green);
}

.lang-options {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background-color: var(--black-lighter);
    border: 1px solid var(--border-medium);
    min-width: 50px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    z-index: 100;
}

.lang-selector.active .lang-options {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: block;
    width: 100%;
    background: none;
    border: none;
    color: var(--white);
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    font-family: var(--font-primary);
    text-align: center;
}

.lang-option:hover {
    background-color: var(--gray-dark);
    color: var(--primary-green);
}

.lang-option:first-child {
    border-bottom: 1px solid var(--border-subtle);
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    display: inline-block;
    padding: 14px 36px;
    border-radius: 0;
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    text-align: center;
    letter-spacing: 0.3px;
}

.btn-primary {
    background-color: var(--primary-green);
    color: var(--black);
    font-weight: 500;
}

.btn-primary:hover {
    background-color: var(--primary-green-light);
    transform: translateY(-1px);
    box-shadow: var(--shadow-soft);
}

.btn-secondary {
    background-color: transparent;
    color: var(--white);
    border: 1px solid var(--border-medium);
    font-weight: 400;
}

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

.btn-large {
    padding: 18px 44px;
    font-size: 15px;
    letter-spacing: 0.3px;
}

.btn-small {
    padding: 10px 24px;
    font-size: 13px;
    font-weight: 500;
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    padding-top: 100px;
    padding-bottom: 80px;
    overflow: hidden;
    background: linear-gradient(180deg, var(--black) 0%, var(--black-light) 100%);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    opacity: 0.4;
}

.geometric-shape {
    position: absolute;
    top: 15%;
    left: -5%;
    width: 500px;
    height: 500px;
    border: 1px solid var(--primary-green);
    border-radius: 0;
    transform: rotate(-45deg);
    opacity: 0.15;
    filter: blur(2px);
}

.geometric-shape::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 300px;
    height: 300px;
    border: 1px solid var(--primary-green);
    transform: translate(-50%, -50%) rotate(45deg);
    opacity: 0.1;
}

.hero-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
    z-index: 1;
}

.hero-title {
    font-size: clamp(3.5rem, 7vw, 5.5rem);
    font-weight: 600;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.gradient-text {
    color: var(--white);
    display: block;
    font-weight: 600;
}

.hero-subtitle {
    display: block;
    font-size: clamp(0.875rem, 2vw, 1rem);
    font-weight: 400;
    color: var(--primary-green);
    letter-spacing: 3px;
    margin-top: 1rem;
    text-transform: uppercase;
    font-weight: 500;
}

.hero-description {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    color: var(--gray-light);
    margin: 2.5rem auto 3.5rem;
    max-width: 680px;
    line-height: 1.75;
    font-weight: 400;
}

.hero-cta {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 5rem;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 3rem;
    margin-top: 5rem;
    padding-top: 4rem;
    border-top: 1px solid var(--border-subtle);
}

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

.stat-value {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 600;
    color: var(--white);
    margin-bottom: 0.5rem;
    letter-spacing: -0.01em;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray);
    text-transform: none;
    letter-spacing: 0;
    font-weight: 400;
}

/* ============================================
   SECTIONS
   ============================================ */

section {
    padding: 7rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 5rem;
}

.section-title {
    font-size: clamp(2.25rem, 5vw, 3.5rem);
    font-weight: 600;
    margin-bottom: 1.25rem;
    color: var(--white);
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.section-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.25rem);
    color: var(--gray-light);
    max-width: 640px;
    margin: 0 auto;
    line-height: 1.7;
    font-weight: 400;
}

/* ============================================
   FEATURES SECTION
   ============================================ */

.features {
    background-color: var(--black-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
}

.feature-card {
    background-color: var(--black-lighter);
    padding: 3rem;
    border-radius: 0;
    border: 1px solid var(--border-subtle);
    transition: var(--transition);
}

.feature-card:hover {
    border-color: var(--border-medium);
    background-color: var(--gray-dark);
    transform: translateY(-2px);
}

.feature-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 2rem;
    color: var(--primary-green);
    opacity: 0.9;
}

.feature-icon svg {
    width: 100%;
    height: 100%;
}

.feature-title {
    font-size: 1.375rem;
    font-weight: 500;
    margin-bottom: 1rem;
    color: var(--white);
    letter-spacing: -0.01em;
}

.feature-description {
    color: var(--gray-light);
    line-height: 1.75;
    font-size: 0.9375rem;
    font-weight: 400;
}

/* ============================================
   MARKETS SECTION
   ============================================ */

.markets {
    background-color: var(--black);
}

.markets-table {
    background-color: var(--black-lighter);
    border-radius: 0;
    overflow: hidden;
    border: 1px solid var(--border-subtle);
}

.market-row {
    display: grid;
    grid-template-columns: 2fr 1.5fr 1fr 1.5fr 1fr;
    gap: 2rem;
    padding: 1.75rem 2rem;
    border-bottom: 1px solid var(--border-subtle);
    align-items: center;
    transition: var(--transition);
}

.market-row:not(.header):hover {
    background-color: var(--gray-dark);
}

.market-row:last-child {
    border-bottom: none;
}

.market-row.header {
    background-color: var(--black-light);
    font-weight: 500;
    color: var(--gray-light);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 1.5px;
    padding: 1.25rem 2rem;
}

.market-col {
    color: var(--white);
}

.crypto-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.crypto-icon {
    width: 44px;
    height: 44px;
    background-color: var(--gray-dark);
    border-radius: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--primary-green);
    font-weight: 500;
    border: 1px solid var(--border-subtle);
}

.crypto-name {
    font-weight: 500;
    color: var(--white);
    font-size: 1rem;
}

.crypto-symbol {
    font-size: 0.8125rem;
    color: var(--gray);
    text-transform: uppercase;
    font-weight: 400;
    letter-spacing: 0.5px;
}

.positive {
    color: var(--primary-green);
    font-weight: 500;
}

.negative {
    color: #e85d5d;
    font-weight: 500;
}

/* ============================================
   SECURITY SECTION
   ============================================ */

.security {
    background-color: var(--black-light);
}

.security-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.security-features {
    list-style: none;
    margin-top: 2rem;
}

.security-features li {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
    color: var(--gray-light);
}

.security-features li svg {
    width: 20px;
    height: 20px;
    color: var(--primary-green);
    flex-shrink: 0;
    margin-top: 4px;
    opacity: 0.9;
}

.security-features li span {
    font-size: 0.9375rem;
    line-height: 1.7;
}

.security-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.security-shield {
    width: 280px;
    height: 280px;
    color: var(--primary-green);
    opacity: 0.6;
}

.security-shield svg {
    width: 100%;
    height: 100%;
}

.security-shield svg {
    width: 100%;
    height: 100%;
}

/* ============================================
   ABOUT SECTION
   ============================================ */

.about {
    background-color: var(--black);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-text p {
    font-size: 1.125rem;
    color: var(--gray-light);
    margin-bottom: 1.75rem;
    line-height: 1.8;
    font-weight: 400;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.about-stat {
    text-align: center;
    padding: 2.5rem 2rem;
    background-color: var(--black-lighter);
    border-radius: 0;
    border: 1px solid var(--border-subtle);
}

.about-stat-value {
    font-size: 2.75rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.about-stat-label {
    color: var(--gray);
    font-size: 0.875rem;
    font-weight: 400;
}

/* ============================================
   CONTACT SECTION
   ============================================ */

.contact {
    background-color: var(--black-light);
}

.contact-content {
    max-width: 500px;
    margin: 0 auto;
}

.contact-form {
    background-color: var(--black-lighter);
    padding: 3.5rem;
    border-radius: 0;
    border: 1px solid var(--border-subtle);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group input {
    width: 100%;
    padding: 1.125rem 1.25rem;
    background-color: var(--black-light);
    border: 1px solid var(--border-subtle);
    border-radius: 0;
    color: var(--white);
    font-size: 0.9375rem;
    font-family: var(--font-primary);
    transition: var(--transition);
    font-weight: 400;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-green);
    background-color: var(--gray-dark);
}

.form-group input::placeholder {
    color: var(--gray);
    font-weight: 400;
}

.form-note {
    margin-top: 1.5rem;
    font-size: 0.85rem;
    color: var(--gray-light);
    text-align: center;
}

.form-note a {
    color: var(--primary-green);
    text-decoration: none;
    font-weight: 400;
}

.form-note a:hover {
    text-decoration: underline;
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
    background-color: var(--black-light);
    border-top: 1px solid var(--border-subtle);
    padding: 5rem 0 2.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 4rem;
    margin-bottom: 3rem;
}

.footer-description {
    color: var(--gray-light);
    margin-top: 1rem;
    line-height: 1.8;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 2rem;
}

.footer-column h4 {
    color: var(--white);
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 500;
}

.footer-column ul {
    list-style: none;
}

.footer-column ul li {
    margin-bottom: 0.75rem;
}

.footer-column ul li a {
    color: var(--gray-light);
    text-decoration: none;
    transition: var(--transition);
}

.footer-column ul li a:hover {
    color: var(--primary-green);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(0, 255, 65, 0.1);
    color: var(--gray-light);
    font-size: 0.85rem;
}

.footer-bottom p {
    margin-bottom: 0.5rem;
}

.footer-note {
    font-size: 0.75rem;
    color: var(--gray);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 968px) {
    .mobile-menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background-color: rgba(0, 0, 0, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        transform: translateX(100%);
        transition: var(--transition);
        border-top: 1px solid var(--border-subtle);
    }

    .nav-menu.active {
        transform: translateX(0);
    }
    
    .lang-selector-wrapper {
        width: 100%;
    }
    
    .lang-selector {
        width: 100%;
    }
    
    .lang-current {
        width: 100%;
    }
    
    .lang-options {
        right: 0;
        left: 0;
        width: 100%;
    }

    .security-content {
        grid-template-columns: 1fr;
    }

    .security-shield {
        width: 200px;
        height: 200px;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .hero-cta {
        flex-direction: column;
    }

    .hero-cta .btn {
        width: 100%;
    }

    .market-row {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

    .market-row.header {
        display: none;
    }

    .market-col {
        display: flex;
        justify-content: space-between;
        padding: 0.5rem 0;
        border-bottom: 1px solid rgba(0, 255, 65, 0.05);
    }

    .market-col:last-child {
        border-bottom: none;
    }

    .market-col::before {
        content: attr(data-label);
        font-weight: 500;
        color: var(--gray-light);
        text-transform: uppercase;
        font-size: 0.75rem;
        letter-spacing: 1px;
    }

    .contact-form {
        padding: 2rem;
    }

    section {
        padding: 4rem 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 24px;
    }

    .hero-stats {
        grid-template-columns: 1fr;
    }

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

    .about-stats {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   SCROLL ANIMATIONS
   ============================================ */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}