:root {
    --color-bg: #F8F6F3;
    --color-text: #111;
    --color-text-muted: #555;
    --color-accent: #6B5B4F;
    --color-border: #E5E1DC;
    --color-white: #fff;
    --font-family: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    --max-width-content: 1200px;
    --max-width-text: 760px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-family);
    min-height: 100vh;
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

.container-responsive {
    width: 100%;
    max-width: var(--max-width-content);
    margin: 0 auto;
    padding: 0 20px;
}

.container-text {
    width: 100%;
    max-width: var(--max-width-text);
    margin: 0 auto;
    padding: 0 20px;
}

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

.navbar-custom {
    background: transparent;
    padding: var(--spacing-md) 0;
}

.navbar-brand {
    font-weight: 600;
    color: var(--color-text) !important;
    font-size: clamp(0.9rem, 2vw, 1.1rem);
    letter-spacing: 0.5px;
}

.nav-link {
    color: var(--color-text) !important;
    font-weight: 500;
    font-size: clamp(0.875rem, 1.5vw, 1rem);
    padding: 0.5rem 0.75rem !important;
}

h1 {
    font-size: clamp(1.75rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.5px;
}

h2 {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 700;
    line-height: 1.2;
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 600;
    line-height: 1.3;
}

h4 {
    font-size: clamp(1.1rem, 2.5vw, 1.4rem);
    font-weight: 600;
    line-height: 1.4;
}

p {
    font-size: clamp(0.9rem, 1.5vw, 1.05rem);
    line-height: 1.7;
}

.text-large {
    font-size: clamp(1rem, 2vw, 1.2rem);
}

.text-small {
    font-size: clamp(0.8rem, 1.25vw, 0.95rem);
}

.btn-primary-cta {
    background-color: var(--color-text);
    color: var(--color-white);
    border: none;
    border-radius: 6px;
    padding: clamp(12px, 2vw, 16px) clamp(24px, 4vw, 36px);
    font-weight: 600;
    font-size: clamp(0.9rem, 1.5vw, 1.05rem);
    text-decoration: none;
    display: inline-block;
    transition: background-color 0.2s, transform 0.1s;
    cursor: pointer;
}

.btn-primary-cta:hover {
    background-color: #333;
    color: var(--color-white);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-text);
    border: 2px solid var(--color-text);
    border-radius: 6px;
    padding: clamp(10px, 1.5vw, 14px) clamp(20px, 3vw, 28px);
    font-weight: 600;
    font-size: clamp(0.85rem, 1.5vw, 1rem);
    text-decoration: none;
    display: inline-block;
    transition: all 0.2s;
}

.btn-secondary:hover {
    background-color: var(--color-text);
    color: var(--color-white);
}

.card-responsive {
    background: var(--color-white);
    border-radius: clamp(12px, 2vw, 20px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    padding: clamp(1.5rem, 4vw, 3rem);
    width: 100%;
}

.form-control {
    border: 2px solid var(--color-border);
    border-radius: 8px;
    padding: clamp(10px, 1.5vw, 14px) clamp(12px, 2vw, 16px);
    font-size: clamp(0.9rem, 1.5vw, 1rem);
    transition: border-color 0.3s;
}

.form-control:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 0.2rem rgba(107, 91, 79, 0.1);
    outline: none;
}

.form-label {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.5rem;
    font-size: clamp(0.85rem, 1.5vw, 1rem);
}

.section-padding {
    padding: clamp(40px, 8vw, 80px) 20px;
}

.section-padding-sm {
    padding: clamp(24px, 5vw, 48px) 20px;
}

@media (max-width: 575px) {
    html {
        font-size: 14px;
    }
    
    .container, .container-responsive {
        padding: 0 16px;
    }
    
    .navbar-custom {
        padding: 1rem 0;
    }
    
    .navbar-brand {
        font-size: 0.95rem;
    }
    
    .nav-link {
        padding: 0.4rem 0.5rem !important;
        font-size: 0.85rem;
    }
    
    .card-responsive {
        padding: 1.25rem;
        border-radius: 12px;
    }
    
    .btn-primary-cta {
        width: 100%;
        text-align: center;
        padding: 14px 24px;
    }
    
    .row {
        --bs-gutter-x: 1rem;
    }
    
    .col-md-6 {
        margin-bottom: 1rem;
    }
}

@media (min-width: 576px) and (max-width: 767px) {
    html {
        font-size: 15px;
    }
    
    .container, .container-responsive {
        padding: 0 20px;
    }
}

@media (min-width: 768px) and (max-width: 1024px) {
    html {
        font-size: 15px;
    }
    
    .container, .container-responsive {
        max-width: 720px;
    }
}

@media (min-width: 1025px) and (max-width: 1440px) {
    html {
        font-size: 16px;
    }
    
    .container, .container-responsive {
        max-width: 960px;
    }
}

@media (min-width: 1441px) {
    html {
        font-size: 16px;
    }
    
    .container, .container-responsive {
        max-width: var(--max-width-content);
    }
    
    h1 {
        font-size: 3.5rem;
    }
    
    h2 {
        font-size: 2.5rem;
    }
}

@media (min-width: 1920px) {
    .container, .container-responsive {
        max-width: 1400px;
    }
}

.hero-section-responsive {
    max-width: 800px;
    margin: 0 auto;
    padding: clamp(60px, 10vw, 100px) 20px clamp(40px, 8vw, 64px);
    text-align: center;
}

.form-section-responsive {
    background: var(--color-white);
    border-radius: clamp(12px, 2vw, 20px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.08);
    padding: clamp(1.5rem, 4vw, 3rem);
    max-width: 600px;
    margin: 0 auto clamp(40px, 8vw, 60px);
}

.auth-card-responsive {
    background: var(--color-white);
    border-radius: 15px;
    padding: clamp(24px, 5vw, 40px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    max-width: 450px;
    width: calc(100% - 40px);
    margin: 20px;
}

.service-card-responsive {
    background: var(--color-white);
    border-radius: clamp(12px, 2vw, 16px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    padding: clamp(1.5rem, 3vw, 2rem);
    height: 100%;
    transition: transform 0.3s, box-shadow 0.3s;
    display: flex;
    flex-direction: column;
}

.service-card-responsive:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.12);
}

.chart-card-responsive {
    background: var(--color-white);
    border-radius: 15px;
    padding: clamp(1rem, 3vw, 1.5rem);
    margin-bottom: clamp(1rem, 2vw, 1.25rem);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
}

@media (max-width: 767px) {
    .chart-card-responsive .row {
        flex-direction: column;
    }
    
    .chart-card-responsive .col-md-6 {
        text-align: left !important;
    }
    
    .chart-card-responsive .col-md-6:last-child {
        margin-top: 1rem;
    }
    
    .btn-download {
        width: 100%;
        margin: 4px 0;
        display: block;
    }
}

.footer-responsive {
    text-align: center;
    padding: clamp(24px, 5vw, 48px) 20px;
    border-top: 1px solid var(--color-border);
}

.footer-responsive p {
    color: #666;
    font-size: clamp(0.85rem, 1.25vw, 0.95rem);
    font-style: italic;
    margin: 0;
}

.d-flex-responsive {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

@media (max-width: 575px) {
    .d-flex-responsive {
        flex-direction: column;
    }
}

.grid-responsive {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
    gap: clamp(1rem, 3vw, 2rem);
}

.hide-mobile {
    display: block;
}

.show-mobile {
    display: none;
}

@media (max-width: 767px) {
    .hide-mobile {
        display: none;
    }
    
    .show-mobile {
        display: block;
    }
}