/* ===================================
   BK GREEN ENERGY - COMMON STYLES
   Shared across all pages
   =================================== */

/* ===================================
   DESIGN SYSTEM - CSS VARIABLES
   =================================== */

:root {
    /* Brand Colors - Solar Industry Standard */
    --primary-green: #0f7c3a;
    --secondary-green: #19a84a;
    --accent-green: #90cf4d;
    --white: #ffffff;
    --black: #000000;
    --dark: #1a1a1a;
    
    /* Backgrounds */
    --bg-light: #f8f9fa;
    --bg-green-light: #e8f5e9;
    
    /* Text Colors */
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-light: #999999;
    
    /* Spacing Scale */
    --space-xs: 20px;
    --space-sm: 40px;
    --space-md: 60px;
    --space-lg: 80px;
    --space-xl: 100px;
    
    /* Typography Scale */
    --text-xs: 0.875rem;
    --text-sm: 1rem;
    --text-base: 1.1rem;
    --text-lg: 1.2rem;
    --text-xl: 1.5rem;
    --text-2xl: 1.8rem;
    --text-3xl: 2.5rem;
    --text-4xl: 3rem;
    --text-5xl: 3.5rem;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 5px 20px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.15);
    --shadow-green: 0 10px 30px rgba(15, 124, 58, 0.2);
    
    /* Z-Index Scale */
    --z-base: 0;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal: 400;
    
    /* Breakpoints */
    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
}

/* ===================================
   RESET & BASE STYLES
   =================================== */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xs);
}

/* ===================================
   NAVBAR - SHARED COMPONENT
   =================================== */

.custom-navbar {
    background-color: rgba(255, 255, 255, 0.4);
    border-radius: 50rem;
    justify-content: space-between;
    align-items: center;
    width: 97%;
    height: auto;
    min-height: 4.5rem;
    padding: 0 1rem;
    display: flex;
}

.custom-navbar .nav-link {
    color: var(--black);
    font-weight: 700;
    margin-left: 18px;
    transition: 0.3s ease;
    letter-spacing: 0.5px;
}

.custom-navbar .nav-link:hover {
    color: var(--white);
}

.btn-nav {
    border: 2px solid var(--primary-green);
    padding: 6px 18px;
    border-radius: 30px;
    color: var(--primary-green);
    font-weight: 700;
    transition: all 0.3s ease;
}

.btn-nav:hover {
    background: var(--primary-green);
    color: var(--white) !important;
}

.navbar-toggler {
    border: none;
}

.navbar-toggler-icon {
    background-image: none;
}

.navbar-toggler::after {
    content: "☰";
    font-size: 24px;
    color: var(--primary-green);
}

.navbar-scrolled {
    background: var(--accent-green);
    padding: 12px 0;
    box-shadow: 0px 2px 14px rgba(0, 0, 0, 0.15);
}

.navbar-scrolled .nav-link {
    color: var(--black);
}

.navbar-scrolled .btn-nav {
    color: var(--black);
}

/* ===================================
   FOOTER - SHARED COMPONENT
   =================================== */

footer {
    background: var(--black);
    color: #e2e8f0;
    padding: var(--space-md) var(--space-sm) var(--space-xs);
    font-family: 'Poppins', sans-serif;
}

.footer-container {
    max-width: 1200px;
    margin: auto;
}

.footer-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: var(--space-xs);
}

.footer-logo img {
    height: 70px;
    width: 70px;
    object-fit: contain;
    background: var(--white);
    padding: 8px;
    border-radius: 50%;
}

.footer-contact {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 6px;
    font-size: 16px;
}

.footer-contact a {
    color: #cbd5e1;
    text-decoration: none;
    transition: 0.3s;
    text-align: right;
}

.footer-contact a:hover {
    color: var(--accent-green);
}

.footer-columns {
    display: flex;
    justify-content: space-between;
    gap: var(--space-sm);
    margin-top: var(--space-sm);
}

.footer-title {
    margin-bottom: 15px;
    font-size: 16px;
    font-weight: 600;
    color: var(--white);
}

.footer-link {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    color: #cbd5e1;
    text-decoration: none;
    transition: 0.3s;
}

.footer-link:hover {
    color: var(--accent-green);
    padding-left: 5px;
}

.footer-col p {
    font-size: 14px;
    line-height: 1.6;
}

.footer-col a {
    color: #cbd5e1;
    text-decoration: none;
}

.footer-col a:hover {
    color: var(--accent-green);
}

.address-text {
    flex: 1;
}

.footer-divider {
    height: 1px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    width: 100%;
    margin-top: var(--space-sm);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--space-xs);
    font-size: 13px;
    color: #94a3b8;
}

.footer-social {
    display: flex;
    gap: 15px;
}

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
    transition: 0.3s;
    overflow: hidden;
}

.footer-social a:hover {
    background: var(--primary-green);
    transform: translateY(-3px);
}

.footer-social img {
    width: 24px;
    height: 24px;
    object-fit: contain;
}

/* ===================================
   BUTTONS - SHARED COMPONENT
   =================================== */

.btn {
    display: inline-block;
    padding: 14px 30px;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: var(--text-sm);
}

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

.btn-primary:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 6px 25px rgba(15, 124, 58, 0.5);
}

.btn-primary:active {
    transform: translateY(-1px) scale(1.02);
}

/* ===================================
   ANIMATIONS - SHARED
   =================================== */

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

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

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

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

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

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Scroll Animation Classes */
.fade-up {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.8s ease;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: all 0.6s ease;
}

.fade-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.fade-right {
    opacity: 0;
    transform: translateX(50px);
    transition: all 0.8s ease;
}

.fade-right.visible {
    opacity: 1;
    transform: translateX(0);
}

.fade-in-up {
    opacity: 0;
    animation: fadeInUp 1.5s ease forwards;
}

/* Stagger Delays */
.service-card:nth-child(2),
.stat-card:nth-child(2),
.benefit-card:nth-child(2) {
    transition-delay: 0.1s;
}

.service-card:nth-child(3),
.stat-card:nth-child(3),
.benefit-card:nth-child(3) {
    transition-delay: 0.2s;
}

.service-card:nth-child(4),
.stat-card:nth-child(4),
.benefit-card:nth-child(4) {
    transition-delay: 0.3s;
}

/* ===================================
   UTILITY CLASSES
   =================================== */

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

.text-primary {
    color: var(--primary-green);
}

.bg-white {
    background: var(--white);
}

.bg-green {
    background: var(--accent-green);
}

.bg-light {
    background: var(--bg-light);
}

/* ===================================
   RESPONSIVE - MOBILE FIRST
   =================================== */

/* Tablet */
@media (max-width: 968px) {
    .custom-navbar {
        width: 92%;
        margin: 10px auto;
        border-radius: 40px;
        padding: 10px 16px;
    }

    .navbar > .container {
        padding-left: 0;
        padding-right: 0;
    }

    .navbar-collapse {
        width: 100%;
        margin-top: 12px;
    }
}

/* Mobile */
@media (max-width: 768px) {
    .footer-top {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    .footer-contact {
        flex-direction: column;
        gap: 8px;
        align-items: center;
    }

    .footer-columns {
        flex-direction: column;
        text-align: center;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
}

/* Small Mobile */
@media (max-width: 640px) {
    .btn {
        width: 100%;
    }
}

/* ===================================
   ACCESSIBILITY
   =================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus Styles */
a:focus,
button:focus,
input:focus,
textarea:focus {
    outline: 2px solid var(--primary-green);
    outline-offset: 2px;
}