/* ===== CSS RESET & BASE ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --primary: #ff6b35;
    --primary-dark: #e55a2b;
    --primary-light: #ff8c5e;
    --secondary: #1a1a2e;
    --accent: #ff9f1c;
    --dark: #0f0f1a;
    --dark-light: #16162a;
    --text: #ffffff;
    --text-muted: #a0a0b0;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #ff6b35 0%, #ff9f1c 100%);
    --gradient-dark: linear-gradient(135deg, #1a1a2e 0%, #0f0f1a 100%);
    --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);

    /* Spacing */
    --section-padding: 100px 0;
    --container-width: 1200px;

    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== LIGHT MODE ===== */
body.light-mode {
    --dark: #ffffff;
    --dark-light: #f5f5f7;
    --secondary: #e8e8ed;
    --text: #1a1a2e;
    --text-muted: #5a5a6e;
    --glass-bg: rgba(0, 0, 0, 0.03);
    --glass-border: rgba(0, 0, 0, 0.08);
}

body.light-mode .navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
}

body.light-mode .mobile-toggle span {
    background: var(--text);
}

body.light-mode .form-group input,
body.light-mode .form-group select,
body.light-mode .form-group textarea {
    background: rgba(0, 0, 0, 0.03);
}

body.light-mode .cta-content .btn {
    background: #1a1a2e;
    color: #ffffff;
}

/* ===== THEME TOGGLE ===== */
.theme-toggle {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition);
    position: absolute;
    left: 24px;
    top: 50%;
    transform: translateY(-50%);
}

.theme-toggle:hover {
    background: rgba(255, 107, 53, 0.2);
    border-color: var(--primary);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--dark);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== GLASS CARD ===== */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
}

/* ===== NAVIGATION ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(15, 15, 26, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text);
    font-weight: 700;
    font-size: 1.5rem;
}

.logo-img {
    height: 45px;
    width: auto;
    object-fit: contain;
    transition: var(--transition);
}

.logo:hover .logo-img {
    transform: scale(1.05);
    filter: drop-shadow(0 0 10px rgba(255, 107, 53, 0.5));
}

.nav-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    list-style: none;
    width: 100%;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-cta {
    background: var(--gradient-primary);
    padding: 10px 24px !important;
    border-radius: 50px;
    color: var(--text) !important;
}

.nav-cta::after {
    display: none !important;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(255, 107, 53, 0.3);
}

.lang-switch {
    background: var(--glass-bg) !important;
    padding: 8px 16px !important;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
    font-size: 0.9rem !important;
}

.lang-switch:hover {
    background: rgba(255, 255, 255, 0.1) !important;
    border-color: var(--primary);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    position: absolute;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
}

.mobile-toggle span {
    width: 25px;
    height: 2px;
    background: var(--text);
    transition: var(--transition);
}

/* ===== HERO SECTION ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 120px 24px 80px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(255, 107, 53, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(255, 159, 28, 0.1) 0%, transparent 40%),
        radial-gradient(ellipse at 50% 80%, rgba(255, 107, 53, 0.08) 0%, transparent 50%);
    animation: pulseGlow 8s ease-in-out infinite;
}

@keyframes pulseGlow {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
}

.hero-title {
    font-size: clamp(3rem, 10vw, 6rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -2px;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 32px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text);
    box-shadow: 0 4px 20px rgba(255, 107, 53, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 40px rgba(255, 107, 53, 0.4);
}

.btn-secondary {
    background: var(--glass-bg);
    color: var(--text);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-3px);
}

.btn-large {
    padding: 18px 40px;
    font-size: 1.1rem;
}

.btn-full {
    width: 100%;
    justify-content: center;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: var(--text-muted);
    font-size: 0.85rem;
    animation: float 3s ease-in-out infinite;
}

.scroll-arrow {
    width: 24px;
    height: 40px;
    border: 2px solid var(--glass-border);
    border-radius: 20px;
    position: relative;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 10px;
    background: var(--primary);
    border-radius: 4px;
    animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateX(-50%) translateY(0);
    }

    50% {
        transform: translateX(-50%) translateY(-10px);
    }
}

@keyframes scrollBounce {

    0%,
    100% {
        top: 8px;
        opacity: 1;
    }

    50% {
        top: 18px;
        opacity: 0.5;
    }
}

/* ===== SECTION STYLES ===== */
section {
    padding: var(--section-padding);
}

.section-header {
    margin-bottom: 60px;
}

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

.section-tag {
    display: inline-block;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -1px;
}

.section-description {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 600px;
}

.section-header.center .section-description {
    margin: 0 auto;
}

/* ===== ABOUT SECTION ===== */
.about {
    background: var(--dark-light);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.about-card {
    padding: 40px;
    text-align: center;
    transition: var(--transition);
}

.about-card:hover {
    transform: translateY(-10px);
    border-color: rgba(255, 107, 53, 0.3);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 24px;
}

.about-card h3 {
    font-size: 1.3rem;
    margin-bottom: 16px;
}

.about-card p {
    color: var(--text-muted);
    line-height: 1.7;
}

/* ===== MISSION SECTION ===== */
.mission-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.mission-description {
    color: var(--text-muted);
    font-size: 1.1rem;
    line-height: 1.8;
    margin-top: 20px;
}

.pillars {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.pillar {
    display: flex;
    gap: 24px;
    padding: 30px;
    background: var(--glass-bg);
    border-radius: 16px;
    border: 1px solid var(--glass-border);
    transition: var(--transition);
}

.pillar:hover {
    border-color: rgba(255, 107, 53, 0.3);
    transform: translateX(10px);
}

.pillar-number {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.pillar-content h4 {
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.pillar-content p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ===== VOLUNTEER SECTION ===== */
.volunteer {
    background: var(--dark-light);
}

.volunteer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 50px;
}

.volunteer-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    transition: var(--transition);
}

.volunteer-card:hover {
    transform: translateY(-10px);
    border-color: rgba(255, 107, 53, 0.4);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.volunteer-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.volunteer-card h4 {
    font-size: 1.1rem;
    margin-bottom: 12px;
}

.volunteer-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

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

/* ===== STUDIES SECTION ===== */
.studies-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.study-item {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 24px 32px;
    text-decoration: none;
    color: var(--text);
    transition: var(--transition);
}

.study-item:hover {
    transform: translateX(10px);
    border-color: rgba(255, 107, 53, 0.3);
}

.study-icon {
    font-size: 2rem;
}

.study-content {
    flex: 1;
}

.study-content h4 {
    font-size: 1.1rem;
    margin-bottom: 6px;
}

.study-content p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.study-arrow {
    font-size: 1.5rem;
    color: var(--primary);
    transition: var(--transition);
}

.study-item:hover .study-arrow {
    transform: translateX(5px);
}

.study-hidden {
    display: none;
}

.studies-list.expanded .study-hidden {
    display: flex;
    animation: fadeInUp 0.4s ease forwards;
}

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

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

.studies-cta {
    text-align: center;
    margin-top: 30px;
}

.studies-cta .btn svg {
    transition: var(--transition);
}

.studies-cta .btn.expanded svg {
    transform: rotate(180deg);
}

/* ===== CTA SECTION ===== */
.cta-section {
    padding: 80px 0;
}

.cta-content {
    padding: 60px;
    text-align: center;
    background: var(--gradient-primary);
    border: none;
}

.cta-content h2 {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    margin-bottom: 20px;
}

.cta-content p {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 30px;
    opacity: 0.9;
}

.cta-content .btn {
    background: var(--dark);
    color: var(--text);
}

.cta-content .btn:hover {
    background: var(--secondary);
}

/* ===== CONTACT SECTION ===== */
.contact {
    background: var(--dark-light);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

.contact-info p {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-top: 20px;
    line-height: 1.8;
}

.contact-details {
    margin-top: 40px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.contact-icon {
    font-size: 1.5rem;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--glass-bg);
    border-radius: 12px;
    border: 1px solid var(--glass-border);
}

.contact-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.contact-text span {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.contact-text a {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.contact-text a:hover {
    color: var(--primary);
}

/* ===== CONTACT FORM ===== */
.contact-form-wrapper {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 40px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-weight: 500;
    font-size: 0.95rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 16px 20px;
    color: var(--text);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.2);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group select option {
    background: var(--dark);
    color: var(--text);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--dark);
    padding: 80px 0 30px;
    border-top: 1px solid var(--glass-border);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 60px;
    padding-bottom: 50px;
    border-bottom: 1px solid var(--glass-border);
}

.footer-brand p {
    color: var(--text-muted);
    margin-top: 20px;
    max-width: 350px;
    line-height: 1.7;
}

.footer-links {
    display: flex;
    gap: 60px;
}

.footer-column h4 {
    font-size: 1rem;
    margin-bottom: 20px;
    color: var(--text);
}

.footer-column ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

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

.footer-column a:hover {
    color: var(--primary);
}

.footer-logo-big {
    text-align: center;
    margin-bottom: 20px;
}

.footer-logo-big img {
    max-width: 150px;
    height: auto;
    opacity: 0.9;
    transition: var(--transition);
}

.footer-logo-big img:hover {
    opacity: 1;
    transform: scale(1.05);
}

.footer-bottom {
    padding-top: 30px;
    text-align: center;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 992px) {
    .mission-content {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 50px;
    }

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

@media (max-width: 768px) {
    :root {
        --section-padding: 80px 0;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        height: 100vh;
        width: 280px;
        background: var(--dark);
        flex-direction: column;
        justify-content: center;
        gap: 24px;
        padding: 40px;
        transition: var(--transition);
        border-left: 1px solid var(--glass-border);
    }

    .nav-links.active {
        right: 0;
    }

    .mobile-toggle {
        display: flex;
        z-index: 1001;
    }

    .mobile-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .hero-title {
        letter-spacing: -1px;
    }

    .footer-links {
        flex-direction: column;
        gap: 30px;
    }

    .pillar {
        padding: 24px;
    }

    .pillar-number {
        font-size: 2rem;
    }

    .cta-content {
        padding: 40px 24px;
    }

    .contact-form-wrapper {
        padding: 30px;
    }
}

@media (max-width: 480px) {
    .about-grid {
        grid-template-columns: 1fr;
    }

    .volunteer-grid {
        grid-template-columns: 1fr;
    }

    .study-item {
        flex-direction: column;
        text-align: center;
        padding: 24px;
    }

    .study-arrow {
        display: none;
    }
}