/* Container */
.container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* Header & Navigation */
header {
    background-color: var(--header-bg);
    padding: 0.75rem 0; /* Slightly reduced padding */
    box-shadow: 0 2px 4px var(--shadow-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background-color 0.3s ease;
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
}

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

#theme-toggle-container {
    margin-left: auto;
}

.logo-theme-wrapper {
    display: flex;
    align-items: center;
    gap: 1rem; /* Space between logo and theme toggle */
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.logo {
    font-size: 1.5rem; /* Default logo size, h1.logo in base.css for smaller screens */
    color: var(--text-primary);
    margin-bottom: 0;
}

.logo-link:hover {
    text-decoration: none;
}

.navbar-logo-img {
    height: 40px;
}

/* Nav Links */
.nav-links {
    list-style: none;
    display: flex;
    gap: 1rem;
}

.nav-links li {
     margin-left: 20px;  /* Replaced by gap on parent ul */
}

.nav-links a {
    color: var(--text-primary);
    font-weight: 600;
    padding: 0.5rem;
}
.nav-links a:hover, .nav-links a.active-link {
    color: var(--accent-main);
    text-decoration: none;
}

.nav-explore-levels-mobile {
    display: none; /* Hidden by default, shown on mobile */
}

/* CTA Buttons in Nav/Header */
.hero-cta-mobile {
    display: none; /* Base: hide all responsive CTAs */
}
.btn-nav-cta {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

/* Hamburger Menu */
.hamburger {
    display: none; /* Hidden by default, shown in media query */
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--text-primary); /* Use theme color */
    margin: 5px 0;
    transition: all 0.3s ease-in-out;
}

/* Sections General Styling */
section {
    padding: 60px 0;
    transition: background-color 0.3s ease;
}
section:nth-child(even) {
    background-color: var(--bg-secondary); /* Alternating section background */
}

/* Footer */
footer {
    background-color: var(--bg-footer); /* Using bg-footer as dark gray background */
    color: var(--text-footer); /* Light text on dark footer bg */
    text-align: center;
    padding: 2rem 0;
    margin-top: 40px;
    transition: background-color 0.3s ease, color 0.3s ease;
}
html[data-theme="dark"] footer {
    background-color: #111; /* Even darker for footer in dark mode */
    color: var(--text-secondary);
}
footer p {
    margin-bottom: 0;
}

/* Responsive Layout Adjustments */
@media (max-width: 900px) {
    #theme-toggle-container {
        margin-left: 0;
    }
    .logo-theme-wrapper {
        flex-grow: 1; /* Allow logo and theme button to take space */
    }
    .btn-nav-cta-tablet {
        display: inline-block;
    }
    .nav-links {
        display: none; /* Hidden by default on smaller screens */
        flex-direction: column;
        width: 100%;
        position: absolute;
        top: 100%; /* Position below the header */
        left: 0;
        background-color: var(--header-bg); /* Theme-aware background */
        -webkit-backdrop-filter: blur(8px);
        backdrop-filter: blur(8px);
        box-shadow: 0 2px 4px var(--shadow-color);
        padding-bottom: 1rem;
        gap: 0; /* Reset gap for vertical menu */
    }

    .nav-links.active {
        display: flex; /* Show when hamburger is clicked */
    }

    .nav-links li {
        margin: 0;
        text-align: center;
        width: 100%;
    }

    .nav-links a {
        display: block;
        padding: 1rem;
        border-bottom: 1px solid var(--border-color); /* Theme-aware border */
    }
    .nav-links li:last-child a {
        border-bottom: none;
    }

    .hamburger {
        display: block; /* Show hamburger on smaller screens */
    }
    .hamburger.active span:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    .hamburger.active span:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
}

@media (max-width: 430px) {
    h1.logo {
        display: none;
    }
    .logo-link {
        margin-right: auto; /* Push theme toggle to the very end */
    }
    #theme-toggle-container {
        margin-left: 0;
    }
}

@media (max-width: 600px) {
    .logo-theme-wrapper {
        gap: 0.5rem; /* Reduce gap on small screens */
    }
    .btn-nav-cta-tablet {
        display: none;
    }
    .nav-explore-levels-mobile {
        display: list-item;
    }
    .hero-cta-mobile {
        display: inline-block;
        margin-top: 1.5rem;
    }
    .navbar-logo-img {
        height: 32px;
    }
    section { padding: 40px 0; }
}

/* Preloader Styles */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh; /* Use vh to ensure full viewport height */
    background-color: var(--bg-primary);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.75s ease, visibility 0s 0.75s; /* Delay visibility transition */
    visibility: visible;
    opacity: 1;
}

#preloader.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.preloader-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 90%; /* To contain the lines */
}

.preloader-title {
    color: var(--text-primary);
    font-size: 1.8rem;
    margin-bottom: 2rem;
    text-align: center;
    font-weight: 600;
    opacity: 0;
    animation: preloader-fade-in 1.5s ease-out forwards 0.2s;
}

.preloader-animation-container {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    margin-bottom: 2rem;
}

.preloader-line {
    height: 4px; /* Bold line */
    background-color: var(--accent-secondary); /* Blue */
    flex-grow: 1;
    transform: scaleX(0);
    animation: grow-line 1.5s ease-out forwards 0.2s;
}

.preloader-line.left { transform-origin: right; }
.preloader-line.right { transform-origin: left; }

.preloader-balls-container {
    display: flex;
    gap: 15px;
    margin-bottom: 1rem;
}

.preloader-ball {
    width: 20px;
    height: 20px;
    background-color: var(--ball-color);
    border-radius: 50%;
    animation: bounce 0.6s infinite alternate ease-in-out;
    animation-delay: var(--ball-delay);
}

.preloader-logo {
    width: 100px;
    height: auto;
    margin: 0 1rem;
    animation: pulse-logo 2s infinite ease-in-out;
    flex-shrink: 0;
}

.preloader-loading-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    animation: blink-soft 2s infinite ease-in-out;
}

.preloader-text-container {
    height: 2.5em; /* Reserve space to prevent layout jumps */
    display: flex;
    align-items: center;
    justify-content: center;
}

.preloader-text {
    display: inline-block;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent-secondary);
    opacity: 0; /* Start hidden */
}

.preloader-text.animate-text {
    animation: fadeInUpOut 0.65s ease-in-out forwards;
}

@keyframes grow-line {
    to { transform: scaleX(1); }
}

@keyframes bounce {
    to {
        transform: translateY(-25px);
    }
}

@keyframes pulse-logo {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

@keyframes preloader-fade-in {
    to { opacity: 1; }
}

@keyframes fadeInUpOut {
    0% {
        opacity: 0;
        transform: translateY(20px);
    }
    20%, 80% {
        opacity: 1;
        transform: translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateY(-20px);
    }
}

@media (max-width: 600px) {
    .preloader-title {
        font-size: 1.5rem;
    }
    .preloader-logo {
        width: 80px;
    }
    .preloader-text {
        font-size: 1.2rem;
    }
}