:root {
    --clr-bg: #0f172a;
    --clr-bg-alt: #1e293b;
    --clr-text-main: #f8fafc;
    --clr-text-muted: #94a3b8;
    --clr-accent: #22d3ee;
    /* Cyan/Blue */
    --clr-accent-glow: rgba(34, 211, 238, 0.5);
    --clr-primary: #10b981;
    /* Emerald Green for "Repair/Tux" vibe */
    --clr-primary-hover: #059669;

    --font-heading: 'Inter', sans-serif;
    --font-body: 'Inter', sans-serif;

    --transition: all 0.3s ease;
    --shadow-glass: 0 4px 30px rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
    font-family: var(--font-body);
    background-color: var(--clr-bg);
    color: var(--clr-text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Utilities */
.container {
    width: min(90%, 1200px);
    margin-inline: auto;
}

.flex {
    display: flex;
    gap: 1rem;
}

.flow>*+* {
    margin-top: var(--flow-space, 1em);
}

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

.text-center p {
    margin-inline: auto;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Typography */
h1,
h2,
h3,
h4 {
    font-family: var(--font-heading);
    font-weight: 800;
    line-height: 1.1;
    color: var(--clr-text-main);
}

h1 {
    font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(2rem, 4vw + 1rem, 3rem);
    margin-bottom: 2rem;
}

h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

p {
    color: var(--clr-text-muted);
    font-size: 1.125rem;
    max-width: 65ch;
}

.gradient-text {
    background: linear-gradient(to right, var(--clr-primary), var(--clr-accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.accent {
    color: var(--clr-primary);
}

/* Header */
.header {
    padding-block: 1.5rem;
    position: fixed;
    width: 100%;
    z-index: 1000;
    transition: background-color 0.3s ease, backdrop-filter 0.3s ease;
}

.header.scrolled {
    background-color: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 800;
    text-decoration: none;
    color: var(--clr-text-main);
    letter-spacing: -0.05em;
}

.primary-navigation {
    list-style: none;
    align-items: center;
    gap: 2.5rem;
}

.primary-navigation a {
    text-decoration: none;
    color: var(--clr-text-muted);
    font-weight: 500;
    transition: var(--transition);
}

.primary-navigation a:hover,
.primary-navigation a:focus {
    color: var(--clr-primary);
}

.primary-navigation .btn {
    background-color: var(--clr-accent);
    color: var(--clr-bg);
    box-shadow: 0 0 20px rgba(34, 211, 238, 0.4);
    font-weight: 700;
}

.primary-navigation .btn:hover {
    background-color: #fff;
    color: var(--clr-bg);
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(255, 255, 255, 0.6);
}

.mobile-nav-toggle {
    display: none;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 5rem;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    z-index: -1;
}

.hero-background img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.6;
    /* Dimmed for text readability */
}

.hero-background .overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to right, var(--clr-bg) 20%, rgba(15, 23, 42, 0.4) 100%),
        linear-gradient(to bottom, var(--clr-bg) 0%, transparent 20%, transparent 80%, var(--clr-bg) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-actions {
    margin-top: 2rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--clr-primary);
    color: #fff;
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.3);
}

.btn-primary:hover {
    background-color: var(--clr-primary-hover);
    box-shadow: 0 0 30px rgba(16, 185, 129, 0.5);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--clr-text-main);
    backdrop-filter: blur(5px);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.btn-outline {
    border-color: var(--clr-primary);
    color: var(--clr-primary);
    background: transparent;
}

.btn-outline:hover {
    background-color: var(--clr-primary);
    color: #fff;
}

.big {
    padding: 1rem 2.5rem;
    font-size: 1.2rem;
}

/* Sections */
.section {
    padding-block: 6rem;
}

.section-title {
    text-align: center;
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
}

.section-title::after {
    content: '';
    position: absolute;
    width: 60%;
    height: 4px;
    background: var(--clr-primary);
    bottom: -10px;
    left: 20%;
    border-radius: 2px;
}

/* Mission Grid */
.mission-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
}

.mission-card {
    padding: 2rem;
    background: var(--clr-bg-alt);
    border-radius: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.mission-card h3 {
    color: var(--clr-primary);
}

/* Services Grid using Glassmorphism */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 3rem;
    margin-top: 4rem;
}

.glass {
    background: rgba(255, 255, 255, 0.03);
    border-radius: 16px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 3rem;
    text-align: center;
    transition: var(--transition);
}

.glass:hover {
    transform: translateY(-10px);
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.icon-container {
    height: 200px;
    width: 100%;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-container img {
    max-height: 100%;
    max-width: 100%;
    object-fit: contain;
    filter: drop-shadow(0 0 15px rgba(34, 211, 238, 0.2));
}

/* CTA Section */
.cta-section {
    background: linear-gradient(rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.9)), url('images/hero.png');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    margin-top: 4rem;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

/* Footer */
.footer {
    background-color: #0b1120;
    padding-block: 4rem 2rem;
    margin-top: auto;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer h4 {
    margin-bottom: 1.5rem;
    color: var(--clr-text-main);
}

.footer ul {
    list-style: none;
}

.footer ul li {
    margin-bottom: 0.8rem;
}

.footer a {
    text-decoration: none;
    color: var(--clr-text-muted);
    transition: var(--transition);
}

.footer a:hover {
    color: var(--clr-text-main);
}

.copyright {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 0.9rem;
}

.copyright p {
    margin-inline: auto;
}

/* About Us Dropdown */
.dropdown-message {
    position: absolute;
    bottom: 100%;
    left: 0;
    width: 250px;
    padding: 1rem;
    margin-bottom: 0.5rem;
    border-radius: 8px;
    background: rgba(15, 23, 42, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    z-index: 100;
    transition: all 0.3s ease;
    opacity: 1;
    transform: translateY(0);
}

.dropdown-message.hidden {
    opacity: 0;
    transform: translateY(10px);
    pointer-events: none;
}

.dropdown-message p {
    font-size: 0.85rem;
    line-height: 1.4;
    color: var(--clr-text-main);
    margin: 0;
}

/* Animations */
.fade-in {
    opacity: 0;
    animation: fadeIn 1s ease-out forwards;
}

.delay-1 {
    animation-delay: 0.2s;
}

.delay-2 {
    animation-delay: 0.4s;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

/* Media Queries */
@media (max-width: 768px) {
    .h1 {
        font-size: 3rem;
    }

    .primary-navigation {
        position: fixed;
        inset: 0 0 0 30%;
        min-height: 100dvh;
        background: linear-gradient(rgba(15, 23, 42, 0.95), rgba(15, 23, 42, 0.95)), url('images/hero.png');
        background-size: cover;
        background-position: center;
        background-repeat: no-repeat;
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: min(30vh, 10rem) 2em;
        z-index: 1000;
        transform: translateX(100%);
        transition: transform 0.3s ease-in-out;
    }

    .primary-navigation[data-visible="true"] {
        transform: translateX(0%);
    }

    .mobile-nav-toggle {
        display: block;
        position: absolute;
        top: 2rem;
        right: 2rem;
        z-index: 9999;
        background: transparent;
        border: 0;
        width: 2rem;
        aspect-ratio: 1;
        cursor: pointer;
    }

    .hamburger {
        width: 100%;
        height: 2px;
        background: white;
        position: relative;
    }

    .hamburger::before,
    .hamburger::after {
        content: '';
        position: absolute;
        width: 100%;
        height: 2px;
        background: white;
        left: 0;
    }

    .hamburger::before {
        top: -6px;
    }

    .hamburger::after {
        top: 6px;
    }

    .header-container {
        padding-inline: 2rem;
    }
}

/* Forms */
.volunteer-form-container,
.expandable-form-container {
    margin-top: 3rem;
    max-width: 600px;
    margin-inline: auto;
    transition: all 0.5s ease-in-out;
    opacity: 1;
    max-height: 1000px;
    overflow: hidden;
}

.volunteer-form-container.hidden,
.expandable-form-container.hidden {
    opacity: 0;
    max-height: 0;
    margin-top: 0;
    pointer-events: none;
}

.volunteer-form {
    text-align: left;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 600;
    color: var(--clr-text-main);
    font-size: 0.95rem;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea {
    padding: 1rem;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--clr-text-main);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:hover,
.form-group textarea:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--clr-primary);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 15px rgba(16, 185, 129, 0.2);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    padding: 0.5rem;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 12px;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    color: var(--clr-text-muted);
    transition: var(--transition);
}

.checkbox-group label:hover {
    color: var(--clr-text-main);
}

.checkbox-group input[type="checkbox"] {
    accent-color: var(--clr-primary);
    width: 1.2rem;
    height: 1.2rem;
    cursor: pointer;
}