@charset "UTF-8";
/*!
 * BT Construction - Custom Theme
 * Industrial B2B Construction Website
 */

/* ============================================
   CSS CUSTOM PROPERTIES (Variables)
   ============================================ */
:root {
    /* Primary Colors - Industrial Palette */
    --bt-navy: #1a2b4a;
    --bt-navy-dark: #0f1a2e;
    --bt-navy-light: #2a3f66;
    --bt-charcoal: #2d3436;
    --bt-slate: #4a5568;
    
    /* Accent Colors */
    --bt-orange: #e67e22;
    --bt-orange-dark: #d35400;
    --bt-orange-light: #f39c12;
    
    /* Neutral Colors */
    --bt-white: #ffffff;
    --bt-off-white: #f8f9fa;
    --bt-light-gray: #e9ecef;
    --bt-medium-gray: #6c757d;
    --bt-dark-gray: #343a40;
    
    /* Functional Colors */
    --bt-success: #27ae60;
    --bt-danger: #c0392b;
    
    /* Typography */
    --font-heading: 'Roboto Condensed', 'Arial Narrow', sans-serif;
    --font-body: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Spacing */
    --section-padding: 6rem;
    --section-padding-sm: 4rem;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
}

/* ============================================
   BASE STYLES
   ============================================ */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    margin: 0;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.6;
    color: var(--bt-charcoal);
    background-color: var(--bt-white);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-top: 0;
    margin-bottom: 0.5rem;
    color: var(--bt-navy);
}

p {
    margin-top: 0;
    margin-bottom: 1rem;
}

a {
    color: var(--bt-orange);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--bt-orange-dark);
}

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

/* ============================================
   NAVIGATION
   ============================================ */
#mainNav {
    min-height: 70px;
    background-color: transparent;
    transition: all var(--transition-medium);
    padding: 0.5rem 0;
}

#mainNav.navbar-shrink {
    background-color: var(--bt-navy);
    box-shadow: var(--shadow-md);
}

#mainNav .navbar-brand {
    padding: 0;
}

#mainNav .navbar-logo {
    height: 60px;
    width: auto;
    transition: all var(--transition-medium);
}

#mainNav.navbar-shrink .navbar-logo {
    height: 50px;
}

#mainNav .navbar-toggler {
    font-size: 0.875rem;
    padding: 0.5rem 0.75rem;
    color: var(--bt-white);
    border: 1px solid rgba(255, 255, 255, 0.5);
    background: transparent;
}

#mainNav .navbar-toggler:focus {
    outline: none;
    box-shadow: none;
}

#mainNav .nav-link {
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: rgba(255, 255, 255, 0.85);
    padding: 1rem 1.25rem;
    transition: color var(--transition-fast);
}

#mainNav .nav-link:hover {
    color: var(--bt-orange);
}

#mainNav .nav-link.active {
    color: var(--bt-orange);
}

@media (max-width: 991.98px) {
    #mainNav {
        background-color: var(--bt-navy);
    }
    
    #mainNav .navbar-collapse {
        background-color: var(--bt-navy);
        padding: 1rem;
        margin-top: 0.5rem;
    }
}

/* ============================================
   MASTHEAD / HERO SECTION
   ============================================ */
.masthead {
    position: relative;
    width: 100%;
    min-height: 100vh;
    padding: 10rem 0 6rem;
    display: flex;
    align-items: center;
    background: linear-gradient(
        135deg,
        rgba(26, 43, 74, 0.95) 0%,
        rgba(15, 26, 46, 0.9) 100%
    ), url('../assets/img/bg-masthead.jpg');
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    background-attachment: fixed;
}


.text-white-75 {
    color: rgba(255, 255, 255, 0.75);
}

@media (min-width: 768px) {
    .masthead h1 {
        font-size: 3.5rem;
    }
    
    .masthead h2 {
        font-size: 1.35rem;
    }
}

@media (min-width: 992px) {
    .masthead h1 {
        font-size: 4rem;
    }
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    font-family: var(--font-heading);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.875rem 2rem;
    border-radius: 0;
    border: none;
    transition: all var(--transition-fast);
}

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

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--bt-orange-dark);
    color: var(--bt-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-lg {
    padding: 1rem 2.5rem;
    font-size: 1rem;
}

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

.btn-outline-light:hover {
    background-color: var(--bt-white);
    color: var(--bt-navy);
}

/* ============================================
   SECTION COMMON STYLES
   ============================================ */
section {
    padding: var(--section-padding) 0;
}

.section-heading {
    font-size: 2.25rem;
    margin-bottom: 0.5rem;
    position: relative;
}

.accent-bar {
    width: 60px;
    height: 4px;
    background-color: var(--bt-orange);
    margin-bottom: 1.5rem;
}

.text-muted {
    color: var(--bt-medium-gray) !important;
}

/* ============================================
   INTRO SECTION
   ============================================ */
.intro-section {
    padding: 5rem 0;
    background-color: var(--bt-navy);
}

.intro-section .lead {
    font-size: 1.35rem;
    color: var(--bt-white);
    line-height: 1.7;
}

.intro-section .lead strong {
    color: var(--bt-orange);
}

.value-card {
    text-align: center;
    padding: 1.5rem;
    background-color: rgba(255, 255, 255, 0.05);
    border-top: 3px solid var(--bt-orange);
}

.value-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bt-orange);
    color: var(--bt-white);
    font-size: 1.5rem;
}

.value-card h4 {
    color: var(--bt-white);
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.value-card p {
    color: rgba(255, 255, 255, 0.75);
    margin-bottom: 0;
    font-size: 0.95rem;
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about-section {
    background-color: var(--bt-white);
}

.about-image-wrapper {
    position: relative;
}

.about-image-wrapper img {
    position: relative;
    z-index: 2;
    box-shadow: var(--shadow-lg);
}

.about-image-wrapper .image-accent {
    position: absolute;
    top: 20px;
    left: 20px;
    right: -20px;
    bottom: -20px;
    border: 4px solid var(--bt-orange);
    z-index: 1;
}

.about-section p {
    font-size: 1.1rem;
    color: var(--bt-slate);
}

.bt-difference {
    background-color: var(--bt-off-white);
    padding: 1.5rem;
    border-left: 4px solid var(--bt-orange);
}

.bt-difference h4 {
    font-size: 1.1rem;
    color: var(--bt-navy);
    margin-bottom: 0.75rem;
}

.bt-difference p {
    font-size: 1rem;
    color: var(--bt-slate);
}

/* ============================================
   SERVICES SECTION
   ============================================ */
.services-section {
    background-color: var(--bt-off-white);
}

.service-card {
    background-color: var(--bt-white);
    padding: 2rem;
    text-align: center;
    border-bottom: 4px solid transparent;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-medium);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-bottom-color: var(--bt-orange);
}

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bt-navy);
    color: var(--bt-white);
    font-size: 2rem;
    transition: all var(--transition-medium);
}

.service-card:hover .service-icon {
    background-color: var(--bt-orange);
}

.service-card h4 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.service-card p {
    color: var(--bt-slate);
    margin-bottom: 0;
    font-size: 0.95rem;
}

/* ============================================
   WHY BT SECTION
   ============================================ */
.why-section {
    background: linear-gradient(
        135deg,
        var(--bt-navy) 0%,
        var(--bt-navy-dark) 100%
    );
}

.why-section .section-heading {
    color: var(--bt-white);
}

.why-card {
    text-align: center;
    padding: 2.5rem 2rem;
}

.why-icon {
    width: 100px;
    height: 100px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    border: 3px solid var(--bt-orange);
    border-radius: 50%;
    color: var(--bt-orange);
    font-size: 2.5rem;
    transition: all var(--transition-medium);
}

.why-card:hover .why-icon {
    background-color: var(--bt-orange);
    color: var(--bt-white);
}

.why-card h4 {
    color: var(--bt-white);
    font-size: 1.35rem;
    margin-bottom: 1rem;
}

.why-card p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 0;
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact-section {
    background-color: var(--bt-white);
}

.contact-form-wrapper {
    background-color: var(--bt-off-white);
    padding: 3rem;
    box-shadow: var(--shadow-md);
}

.form-label {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--bt-navy);
    margin-bottom: 0.5rem;
}

.form-control {
    border: 2px solid var(--bt-light-gray);
    border-radius: 0;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.form-control:focus {
    border-color: var(--bt-orange);
    box-shadow: 0 0 0 3px rgba(230, 126, 34, 0.15);
    outline: none;
}

.form-control::placeholder {
    color: var(--bt-medium-gray);
}

input[type="file"].form-control {
    padding: 0.5rem;
}

.form-text {
    font-size: 0.85rem;
    color: var(--bt-medium-gray);
}

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

/* ============================================
   CONTACT INFO SECTION
   ============================================ */
.contact-info-section {
    padding: 4rem 0;
    background-color: var(--bt-navy);
}

.info-card {
    text-align: center;
    padding: 2rem;
}

.info-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bt-orange);
    color: var(--bt-white);
    font-size: 1.5rem;
}

.info-card h4 {
    color: var(--bt-white);
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.info-card p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 0;
}

.info-card a {
    color: rgba(255, 255, 255, 0.7);
}

.info-card a:hover {
    color: var(--bt-orange);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background-color: var(--bt-navy-dark);
    padding: 2rem 0;
}

.footer p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    margin: 0;
}

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
    font-size: 1.1rem;
    margin-left: 0.5rem;
    transition: all var(--transition-fast);
}

.social-link:hover {
    background-color: var(--bt-orange);
    color: var(--bt-white);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.bg-light {
    background-color: var(--bt-off-white) !important;
}

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

.text-danger {
    color: var(--bt-danger) !important;
}

/* ============================================
   RESPONSIVE ADJUSTMENTS
   ============================================ */
@media (max-width: 991.98px) {
    section {
        padding: var(--section-padding-sm) 0;
    }
    
    .section-heading {
        font-size: 1.85rem;
    }
    
    .contact-form-wrapper {
        padding: 2rem;
    }
    
    .about-image-wrapper .image-accent {
        display: none;
    }
}

@media (max-width: 767.98px) {
    .masthead {
        padding: 8rem 0 5rem;
        min-height: auto;
    }
    
    .masthead h1 {
        font-size: 2rem;
    }
    
    .masthead h2 {
        font-size: 1.1rem;
    }
    
    .intro-section .lead {
        font-size: 1.15rem;
    }
    
    .service-card {
        padding: 1.5rem;
    }
    
    .why-card {
        padding: 1.5rem;
    }
}

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

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