/* Responsive CSS for Academic Blueprint */

/* Mobile Navigation Drawer */
.mobile-nav-drawer {
    position: fixed;
    top: 0;
    left: -100%;
    width: 320px;
    max-width: 85vw;
    height: 100vh;
    background: #ffffff;
    box-shadow: 2px 0 15px rgba(0,0,0,0.15);
    z-index: 99999;
    overflow-y: auto;
    transition: left 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.mobile-nav-drawer.open {
    left: 0;
}

.mobile-nav-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0,0,0,0.5);
    z-index: 99998;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.mobile-nav-backdrop.open {
    opacity: 1;
    visibility: visible;
}

.mobile-nav-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 20px;
    border-bottom: 1px solid #edf2f7;
}

.mobile-nav-close {
    background: none;
    border: none;
    font-size: 1.4rem;
    color: #4a5568;
    cursor: pointer;
}

.mobile-menu-list {
    list-style: none;
    padding: 10px 0;
}

.mobile-menu-item {
    border-bottom: 1px solid #f7fafc;
}

.mobile-menu-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    font-weight: 600;
    font-size: 0.95rem;
    color: #2d3748;
}

.mobile-submenu {
    display: none;
    background: #f8fafc;
    padding: 10px 0 10px 20px;
    list-style: none;
}

.mobile-menu-item.active .mobile-submenu {
    display: block;
}

.mobile-submenu li a {
    display: block;
    padding: 7px 15px;
    font-size: 0.88rem;
    color: #4a5568;
}

/* Breakpoint: <= 1200px (Desktop / Laptop) */
@media (max-width: 1200px) {
    .container {
        max-width: 960px;
    }
    .hero-title {
        font-size: 2.3rem;
    }
    .nav-link {
        padding: 10px 8px;
        font-size: 0.9rem;
    }
}

/* Breakpoint: <= 1024px (Tablet Landscape / Small Laptop) */
@media (max-width: 1024px) {
    .container {
        max-width: 720px;
    }
    .col-lg-6, .col-lg-7, .col-lg-5, .col-lg-4, .col-lg-8, .col-lg-3 {
        flex: 0 0 100%;
        max-width: 100%;
    }
    .main-navigation .nav-menu {
        display: none;
    }
    .mobile-menu-toggle {
        display: block;
    }
    .hero-section {
        padding: 40px 0 50px;
    }
    .hero-left-col {
        margin-bottom: 40px;
    }
    .pricing-card.featured {
        transform: none;
    }
}

/* Breakpoint: <= 768px (Tablet Portrait / Large Phone) */
@media (max-width: 768px) {
    .container {
        max-width: 540px;
    }
    .col-md-6, .col-md-4, .col-md-3 {
        flex: 0 0 100%;
        max-width: 100%;
    }
    .header-topbar {
        display: none;
    }
    .hero-title {
        font-size: 1.85rem;
    }
    .hero-subtitle {
        font-size: 1rem;
    }
    .stat-box {
        margin-bottom: 20px;
    }
    .mobile-bottom-bar {
        display: block;
    }
    body {
        padding-bottom: 65px;
    }
    .floating-whatsapp {
        bottom: 75px;
        right: 20px;
        width: 50px;
        height: 50px;
        font-size: 26px;
    }
    .back-to-top {
        bottom: 135px;
        right: 22px;
    }
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    .footer-bottom div {
        margin-top: 10px;
    }
    .footer-bottom a {
        margin: 0 8px;
    }
}

/* Breakpoint: <= 390px (iPhone 12/13/14/15 / Standard Mobile) */
@media (max-width: 390px) {
    .container {
        padding-left: 12px;
        padding-right: 12px;
    }
    .hero-title {
        font-size: 1.55rem;
    }
    .hero-subtitle {
        font-size: 0.92rem;
    }
    .calculator-body {
        padding: 16px 14px;
    }
    .pages-words-sync {
        flex-direction: column;
        gap: 8px;
    }
    .btn-lg {
        padding: 12px 20px;
        font-size: 0.95rem;
    }
    .stat-number {
        font-size: 2rem;
    }
    .section-header h2 {
        font-size: 1.6rem;
    }
}