/* ========================================
   RB MUSCU - Modern Clean Design System
   ======================================== */

/* ========== CSS Custom Properties ========== */
:root {
    /* Colors */
    --color-primary: #00CED1;
    --color-primary-dark: #00A8AA;
    --color-primary-light: #4DE0E2;
    --color-secondary: #FF8C00;
    --color-accent: #FF4500;

    --color-dark: #0A0A0A;
    --color-dark-2: #1A1A1A;
    --color-dark-3: #2A2A2A;
    --color-dark-4: #3A3A3A;

    --color-light: #FFFFFF;
    --color-light-2: #F5F5F5;
    --color-light-3: #E5E5E5;

    --color-text: #FFFFFF;
    --color-text-muted: #A0A0A0;

    /* Typography */
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);

    /* Container */
    --container-max-width: 1200px;
    --container-padding: 1.5rem;

    /* Transitions */
    --transition: all 0.2s ease;
}

/* ========== 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-family);
    font-size: 1rem;
    font-weight: var(--font-weight-regular);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-dark);
}

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

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* ========== Utilities ========== */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ========== Typography ========== */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: var(--font-weight-bold);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); }

/* ========== Navigation ========== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    display: flex;
    gap: 0.25rem;
}

.brand-rb {
    color: var(--color-primary);
}

.brand-muscu {
    color: var(--color-light);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 0.375rem;
    width: 2rem;
    height: 2rem;
}

.nav-toggle span {
    width: 100%;
    height: 2px;
    background-color: var(--color-light);
    transition: var(--transition);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-link {
    font-weight: var(--font-weight-medium);
    color: var(--color-text-muted);
}

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

/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-md);
    transition: var(--transition);
    cursor: pointer;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-light);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0, 206, 209, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-light);
    border: 2px solid var(--color-dark-4);
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-light);
    border: 2px solid var(--color-dark-4);
}

.btn-outline:hover {
    background-color: var(--color-light);
    color: var(--color-dark);
    border-color: var(--color-light);
}

.btn-lg {
    padding: 1.125rem 2rem;
    font-size: 1.125rem;
}

.btn-block {
    width: 100%;
}

/* ========== Hero Section ========== */
.hero {
    padding-top: 140px;
    padding-bottom: var(--spacing-3xl);
    background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-dark-2) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: radial-gradient(circle at center, rgba(0, 206, 209, 0.05), transparent);
    pointer-events: none;
}

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

.hero-content {
    max-width: 600px;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: rgba(0, 206, 209, 0.1);
    color: var(--color-primary);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
}

.hero-title {
    margin-bottom: var(--spacing-md);
}

.hero-highlight {
    display: block;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-text {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat strong {
    font-size: 1.75rem;
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
}

.stat span {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-badge-img {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: 50%;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    filter: drop-shadow(0 0 40px rgba(0, 206, 209, 0.3));
}

/* ========== Section ========== */
.section {
    padding: var(--spacing-3xl) 0;
}

.section-dark {
    background-color: var(--color-dark-2);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.section-label {
    display: inline-block;
    color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-muted);
}

/* ========== Services Grid ========== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.service-card {
    background-color: var(--color-dark-2);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
}

.service-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
}

.service-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.service-title {
    margin-bottom: var(--spacing-sm);
}

.service-description {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.service-features {
    list-style: none;
}

.service-features li {
    padding: 0.5rem 0;
    color: var(--color-text-muted);
    position: relative;
    padding-left: 1.5rem;
}

.service-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
}

/* ========== Pricing Grid ========== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1000px;
    margin: 0 auto;
}

.pricing-card {
    background-color: var(--color-dark);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    flex-direction: column;
    position: relative;
}

.pricing-featured {
    border-color: var(--color-primary);
    background-color: rgba(0, 206, 209, 0.03);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--color-primary);
    color: var(--color-dark);
    padding: 0.375rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: var(--font-weight-semibold);
    white-space: nowrap;
}

.pricing-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.pricing-title {
    margin-bottom: var(--spacing-md);
}

.pricing-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.25rem;
}

.price-amount {
    font-size: 3rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
}

.price-period {
    font-size: 1.125rem;
    color: var(--color-text-muted);
}

.pricing-save {
    display: inline-block;
    margin-top: var(--spacing-sm);
    color: var(--color-secondary);
    font-weight: var(--font-weight-semibold);
    font-size: 0.875rem;
}

.pricing-features {
    list-style: none;
    margin-bottom: var(--spacing-lg);
    flex-grow: 1;
}

.pricing-features li {
    padding: 0.75rem 0;
    color: var(--color-text-muted);
    position: relative;
    padding-left: 1.5rem;
}

.pricing-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
}

/* ========== About Section ========== */
.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-description {
    color: var(--color-text-muted);
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.about-certifications {
    display: grid;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.cert-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-dark-2);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.cert-item svg {
    color: var(--color-primary);
    flex-shrink: 0;
}

.cert-item span {
    font-weight: var(--font-weight-medium);
}

/* ========== Contact Section ========== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    max-width: 900px;
    margin: 0 auto;
}

.contact-info-title {
    margin-bottom: var(--spacing-md);
}

.contact-info-text {
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: var(--spacing-xl);
}

.contact-methods {
    display: grid;
    gap: var(--spacing-md);
}

.contact-method {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-dark);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
}

.contact-method:hover {
    border-color: var(--color-primary);
    transform: translateX(4px);
}

.contact-method-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(0, 206, 209, 0.1);
    border-radius: var(--radius-md);
    color: var(--color-primary);
    flex-shrink: 0;
}

.contact-method-content {
    display: flex;
    flex-direction: column;
}

.contact-method-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.contact-method-value {
    font-weight: var(--font-weight-semibold);
}

/* ========== Form ========== */
.contact-form {
    background-color: var(--color-dark);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: var(--font-weight-medium);
    font-size: 0.875rem;
}

.form-input {
    width: 100%;
    padding: 0.875rem 1rem;
    background-color: var(--color-dark-2);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    color: var(--color-light);
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    background-color: var(--color-dark-3);
}

textarea.form-input {
    resize: vertical;
    min-height: 120px;
}

/* ========== Footer ========== */
.footer {
    background-color: var(--color-dark);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-content {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.footer-brand {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
}

.footer-text {
    color: var(--color-text-muted);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-bottom p {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* ========== Footer Credit ========== */
.footer-credit {
    padding: 0.5rem 0;
    text-align: center;
    background-color: var(--color-dark);
}

.footer-credit p {
    margin: 0;
    font-size: 0.625rem;
    font-weight: var(--font-weight-light);
}

.footer-credit a {
    color: var(--color-text-muted);
    text-decoration: none;
    transition: var(--transition);
}

.footer-credit a:hover {
    color: var(--color-primary);
}

/* ========== Modal ========== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: var(--spacing-md);
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--color-dark-2);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    max-width: 500px;
    width: 100%;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    font-size: 1.5rem;
    color: var(--color-text-muted);
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--color-light);
}

.modal-icon {
    width: 64px;
    height: 64px;
    background-color: rgba(0, 206, 209, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--color-primary);
    margin: 0 auto var(--spacing-md);
}

.modal-title {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.modal-text {
    text-align: center;
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: var(--spacing-xl);
}

.modal-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* ========== Responsive Design ========== */

/* Tablets */
@media (min-width: 768px) {
    :root {
        --container-padding: 2rem;
    }

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

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

    .modal-actions {
        flex-direction: row;
    }
}

/* Desktops */
@media (min-width: 1024px) {
    :root {
        --container-padding: 2.5rem;
    }
}

/* Mobile Navigation */
@media (max-width: 767px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background-color: var(--color-dark);
        flex-direction: column;
        padding: var(--spacing-lg);
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-link, .nav-menu .btn {
        width: 100%;
        text-align: center;
    }

    .hero-actions {
        flex-direction: column;
    }

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

    .hero-stats {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
}