/* ===================================
   Smart BD - 24/7 সেবা
   Modern & Dynamic CSS Stylesheet
   =================================== */

/* ===================================
   CSS Variables & Root Styles
   =================================== */
:root {
    --primary-color: #10b981;
    --primary-dark: #059669;
    --primary-light: #34d399;
    --secondary-color: #3b82f6;
    --accent-color: #f59e0b;
    --dark-color: #1f2937;
    --light-color: #f9fafb;
    --text-dark: #111827;
    --text-light: #6b7280;
    --white: #ffffff;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius: 12px;
}

/* ===================================
   Base Styles & Typography
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Inter", "Hind Siliguri", sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
    overflow-x: hidden;
}

.bengali {
    font-family: "Hind Siliguri", sans-serif;
    line-height: 1.8;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

h1 {
    font-size: 3rem;
    font-weight: 800;
}

h2 {
    font-size: 2.5rem;
}

h3 {
    font-size: 1.75rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-light);
}

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

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

/* ===================================
   Container & Layout
   =================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 80px 0;
    position: relative;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
    animation: fadeInUp 0.8s ease;
}

.section-title h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(
        135deg,
        var(--primary-color),
        var(--secondary-color)
    );
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-title p {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ===================================
   Header Styles
   =================================== */
#header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 15px 0;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    transition: var(--transition);
}

.logo:hover {
    transform: scale(1.05);
}

.logo img {
    width: 45px;
    height: 45px;
    border-radius: 10px;
    box-shadow: var(--shadow-md);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(
        135deg,
        var(--primary-color),
        var(--secondary-color)
    );
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Navigation Menu */
.nav-menu {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-link {
    font-weight: 500;
    color: var(--text-dark);
    padding: 8px 16px;
    border-radius: 8px;
    position: relative;
    transition: var(--transition);
}

.nav-link::before {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

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

.nav-link:hover::before,
.nav-link.active::before {
    width: 80%;
}

/* Mobile Toggle */
.mobile-toggle {
    display: none;
    font-size: 1.5rem;
    color: var(--text-dark);
    cursor: pointer;
    transition: var(--transition);
}

.mobile-toggle:hover {
    color: var(--primary-color);
    transform: rotate(90deg);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    background: linear-gradient(
        135deg,
        rgba(16, 185, 129, 0.05),
        rgba(59, 130, 246, 0.05)
    );
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.1), transparent);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

.hero::after {
    content: "";
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.1), transparent);
    border-radius: 50%;
    animation: float 8s ease-in-out infinite reverse;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-text {
    animation: fadeInLeft 1s ease;
}

.hero-text h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.hero-text h1 span {
    background: linear-gradient(
        135deg,
        var(--primary-color),
        var(--secondary-color)
    );
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
}

.hero-text p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.hero-image {
    animation: fadeInRight 1s ease;
    position: relative;
}

.hero-image img {
    width: 55%;
    max-width: 450px;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.2));
    animation: float 3s ease-in-out infinite;
    margin: 0 auto;
}

/* ===================================
   Button Styles
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(
        135deg,
        var(--primary-color),
        var(--primary-dark)
    );
    color: var(--white);
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
    background: linear-gradient(
        135deg,
        #059669, 
        #047857   
    ); 
    
}

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

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

.w-full {
    width: 100%;
}

.w-100 {
    width: 100%;
}

/* ===================================
   About Section
   =================================== */
.about {
    background: var(--white);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    animation: fadeInUp 0.8s ease;
}

.about-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(
        135deg,
        var(--primary-color),
        var(--secondary-color)
    );
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.about-content p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    line-height: 1.8;
}

/* ===================================
   Features Section
   =================================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.feature-card {
    text-align: center;
    background: var(--white);
    padding: 40px 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    animation: fadeInUp 0.8s ease;
}

.feature-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(
        90deg,
        var(--primary-color),
        var(--secondary-color)
    );
    transform: scaleX(0);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    margin: 0 auto 20px auto;
    width: 70px;
    height: 70px;
    background: linear-gradient(
        135deg,
        var(--primary-color),
        var(--primary-light)
    );
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
}

.feature-icon i {
    font-size: 2rem;
    color: var(--white);
}

.feature-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.feature-card p {
    font-size: 1rem;
    line-height: 1.6;
}

/* ===================================
   Contact Section
   =================================== */
.contact {
    background: linear-gradient(
        135deg,
        rgba(16, 185, 129, 0.05),
        rgba(59, 130, 246, 0.05)
    );
}

.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    margin-top: 40px;
}

.contact-info {
    animation: fadeInLeft 0.8s ease;
}

.contact-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    margin-bottom: 30px;
    padding: 20px;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.contact-item:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-md);
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(
        135deg,
        var(--primary-color),
        var(--primary-light)
    );
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon i {
    font-size: 1.3rem;
    color: var(--white);
}

.contact-details h4 {
    font-size: 1.1rem;
    margin-bottom: 5px;
    color: var(--text-dark);
}

.contact-details p {
    font-size: 1rem;
    margin: 0;
}
.contact-details p:hover{
    color: #0abe85;
}



.social-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-link {
    width: 50px;
    height: 50px;
    background: linear-gradient(
        135deg,
        var(--primary-color),
        var(--primary-light)
    );
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.3rem;
    transition: var(--transition);
}

.social-link:hover {
    transform: translateY(-5px) rotate(5deg);
    box-shadow: 0 5px 15px rgba(16, 185, 129, 0.4);
}


/* ===================================
   Footer
   =================================== */
footer {
    background: var(--dark-color);
    color: var(--white);
    padding: 60px 0 20px;
}

.footer-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-widget h4 {
    color: var(--white);
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.footer-widget p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-color);
    padding-left: 5px;
}

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* ===================================
   Side Panel
   =================================== */
.side-panel-trigger {
    position: fixed;
    right: 30px;
    bottom: 30px;
    width: 60px;
    height: 60px;
    background: linear-gradient(
        135deg,
        var(--primary-color),
        var(--primary-light)
    );
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    z-index: 999;
    transition: var(--transition);
    animation: pulse 2s infinite;
}

.side-panel-trigger:hover {
    transform: scale(1.1);
}

.side-panel {
    position: fixed;
    top: 0;
    right: -400px;
    width: 400px;
    height: 100vh;
    background: var(--white);
    box-shadow: var(--shadow-xl);
    padding: 40px;
    overflow-y: auto;
    z-index: 1001;
    transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.side-panel.active {
    right: 0;
}

.panel-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    background: var(--light-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.panel-close:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: rotate(90deg);
}

.panel-title {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ===================================
   Utility Classes
   =================================== */
.mt-4 {
    margin-top: 2rem;
}

.mb-4 {
    margin-bottom: 2rem;
}

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

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

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

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

@keyframes pulse {
    0%,
    100% {
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
    }
    50% {
        box-shadow: 0 0 0 20px rgba(16, 185, 129, 0);
    }
}

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

/* Tablet (768px - 1024px) */
@media (max-width: 1024px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    .hero-content {
        gap: 40px;
    }

    .hero-text h1 {
        font-size: 2.8rem;
    }

    .contact-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .contact-item {
        flex-direction: row;
        align-items: center;
        text-align: left;
    }

    .contact-icon {
        width: 45px;
        height: 45px;
    }

    .contact-details h4 {
        font-size: 1rem;
    }

    .contact-details p {
        font-size: 0.95rem;
    }

    .subscribe-form {
        max-width: 600px;
        margin: 0 auto;
    }
    .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
}

/* Mobile & Small Tablet (max-width: 768px) */
@media (max-width: 768px) {
    .section {
        padding: 60px 0;
    }

    .section-title h2 {
        font-size: 2rem;
    }

    /* Header */
    .nav-menu {
        position: fixed;
        top: 75px;
        left: -100%;
        width: 100%;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: 30px;
        box-shadow: var(--shadow-lg);
        transition: var(--transition);
        gap: 20px;
    }

    .nav-menu.active {
        left: 0;
    }

    .mobile-toggle {
        display: block;
    }

    /* Hero */
    .hero {
        padding-top: 100px;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-text h1 {
        font-size: 2.2rem;
    }

    .hero-text p {
        font-size: 1rem;
    }

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

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

    .hero-image {
        order: 1;
    }
    .hero-image img {
        width: 95%;
    }

    .about-content h2 {
        font-size: 1.8rem;
    }
    /* Contact */
    .contact-container {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .contact-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding: 15px;
    }

    .contact-icon {
        margin-bottom: 10px;
    }

    .subscribe-form {
        width: 100%;
        padding: 25px 20px;
    }

    .subscribe-form h3 {
        font-size: 1.5rem;
    }

    .subscribe-form p {
        font-size: 0.95rem;
    }

    .form-control {
        padding: 12px 15px;
        font-size: 0.95rem;
    }

    .btn {
        width: 100%;
    }

    .social-links {
        justify-content: center;
        flex-wrap: wrap;
    }

    .social-link {
        width: 45px;
        height: 45px;
        font-size: 1.1rem;
    }

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

    /* Footer */
    .footer-container {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    /* Side Panel */
    .side-panel {
        width: 100%;
        right: -100%;
    }
    
    .side-panel-trigger {
        right: 20px;
        bottom: 20px;
        width: 50px;
        height: 50px;
    }
}

/* Small Mobile (max-width: 480px) */
@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .section-title h2 {
        font-size: 1.75rem;
    }

    .hero-text h1 {
        font-size: 1.8rem;
    }

    .hero-text p {
        font-size: 0.95rem;
    }

    .btn {
        padding: 12px 24px;
        font-size: 0.95rem;
    }

    .feature-card {
        padding: 30px 20px;
    }

    .subscribe-form {
        padding: 30px 20px;
    }

    .contact-item {
        padding: 12px;
    }

    .contact-details h4 {
        font-size: 0.95rem;
    }

    .contact-details p {
        font-size: 0.9rem;
    }

    .subscribe-form h3 {
        font-size: 1.3rem;
    }

    .subscribe-form p {
        font-size: 0.9rem;
    }
}

/* Extra Small Mobile (max-width: 360px) */
@media (max-width: 360px) {
    .hero-text h1 {
        font-size: 1.6rem;
    }

    .section-title h2 {
        font-size: 1.5rem;
    }

    .logo-text {
        font-size: 1.2rem;
    }
}