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

:root {
    --primary-green: #00ff88;
    --primary-cyan: #00d4ff;
    --primary-purple: #b366ff;
    --dark-bg: #0a0a0a;
    --card-bg: #151515;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --glow-green: rgba(0, 255, 136, 0.3);
    --glow-cyan: rgba(0, 212, 255, 0.3);
}

/* Light Theme Variables */
html[data-theme="light"] {
    --primary-green: #10a347;
    --primary-cyan: #0088cc;
    --primary-purple: #7c3aed;
    --dark-bg: #f8f9fa;
    --card-bg: #ffffff;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --glow-green: rgba(16, 163, 71, 0.15);
    --glow-cyan: rgba(0, 136, 204, 0.15);
    --boarder-input: 1px solid rgba(31, 30, 30, 0.329);
    --background-input: rgba(243, 241, 241, 0.388);
}

/* Dark Theme Variables */
html[data-theme="dark"] {
    --primary-green: #00ff88;
    --primary-cyan: #00d4ff;
    --primary-purple: #b366ff;
    --dark-bg: #0a0a0a;
    --card-bg: #151515;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --glow-green: rgba(0, 255, 136, 0.3);
    --glow-cyan: rgba(0, 212, 255, 0.3);
    --boarder-input: 1px solid rgba(255, 255, 255, 0.1);
    --background-input: rgba(255, 255, 255, 0.05);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--dark-bg);
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.6;
}

/* ========== ANIMATED BACKGROUND ========== */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 3px;
    height: 3px;
    background: var(--primary-green);
    border-radius: 50%;
    opacity: 0.6;
    animation: float 20s infinite;
}

.particle:nth-child(1) {
    top: 20%;
    left: 10%;
    animation-delay: 0s;
    animation-duration: 25s;
}

.particle:nth-child(2) {
    top: 60%;
    left: 80%;
    animation-delay: 5s;
    animation-duration: 30s;
}

.particle:nth-child(3) {
    top: 40%;
    left: 50%;
    animation-delay: 10s;
    animation-duration: 20s;
}

.particle:nth-child(4) {
    top: 80%;
    left: 30%;
    animation-delay: 3s;
    animation-duration: 28s;
}

.particle:nth-child(5) {
    top: 10%;
    left: 70%;
    animation-delay: 7s;
    animation-duration: 22s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
        opacity: 0.6;
    }
    25% {
        transform: translate(100px, -100px) scale(1.5);
        opacity: 0.8;
    }
    50% {
        transform: translate(-100px, 100px) scale(0.8);
        opacity: 0.4;
    }
    75% {
        transform: translate(150px, 50px) scale(1.2);
        opacity: 0.7;
    }
}

/* ========== NAVIGATION ========== */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(10, 10, 10, 0.95);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

html[data-theme="light"] .navbar {
    background: rgba(255, 255, 255, 0.7);
    border-bottom: 1px solid rgba(5, 150, 105, 0.15);
}

html[data-theme="light"] .navbar.scrolled {
    background: rgba(255, 255, 255, 0.85);
    box-shadow: 0 10px 40px rgba(5, 150, 105, 0.12);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.2rem 2rem;
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-container .theme-toggle-wrapper {
    margin-left: 0;
}

.nav-container .nav-menu {
    margin-left: auto;
}

.logo {
    position: relative;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.logo-text {
    background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, var(--glow-green), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.logo:hover .logo-glow {
    opacity: 1;
}

.nav-menu {
    display: flex;
    gap: 3rem;
    list-style: none;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: color 0.3s ease;
    padding: 0.5rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-green), var(--primary-cyan));
    transition: width 0.3s ease;
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.btn-signin {
    background: transparent;
    color: var(--text-primary);
    border: none;
    padding: 0.6rem 1.5rem;
    cursor: pointer;
    font-weight: 500;
    transition: color 0.3s ease;
}

.btn-signin:hover {
    color: var(--primary-green);
}

.btn-contribute {
    background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
    color: var(--dark-bg);
    border: none;
    padding: 0.7rem 1.8rem;
    border-radius: 50px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 0 20px var(--glow-green);
}

.btn-contribute:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px var(--glow-green);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 5px;
    transition: all 0.3s ease;
}

/* ========== UPLOAD SECTION ========== */
.upload-section {
    min-height: 100vh;
    padding: 6rem 2rem;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.upload-container {
    max-width: 600px;
    width: 100%;
    background: var(--card-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 3rem;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.upload-title {
    font-size: 3rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 1rem;
    letter-spacing: -1px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan), var(--primary-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: gradientShift 5s ease infinite;
}

@keyframes gradientShift {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

.upload-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    font-size: 1.1rem;
}

/* ========== FORM STYLES ========== */
.upload-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.form-group label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.form-group input,
.form-group select {
    padding: 1rem;
    background: var(--background-input);
    border: var(--boarder-input);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-green);
    box-shadow: 0 0 20px var(--glow-green);
    background: rgba(255, 255, 255, 0.08);
}

.form-group input::placeholder {
    color: var(--text-secondary);
}

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

/* ========== FILE UPLOAD STYLES ========== */
.form-group input[type="file"] {
    padding: 0.5rem;
    cursor: pointer;
}

.form-group input[type="file"]::file-selector-button {
    background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
    color: var(--dark-bg);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 600;
    margin-right: 1rem;
    transition: all 0.3s ease;
}

.form-group input[type="file"]::file-selector-button:hover {
    transform: translateY(-1px);
    box-shadow: 0 0 15px var(--glow-green);
}

.file-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* ========== UPLOAD BUTTON ========== */
.upload-btn {
    background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
    color: var(--dark-bg);
    border: none;
    padding: 1.2rem 2rem;
    border-radius: 50px;
    cursor: pointer;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: 0 0 20px var(--glow-green);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1rem;
}

.upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px var(--glow-green);
}

.upload-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-text {
    display: inline;
}

.btn-loader {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(10, 10, 10, 0.3);
    border-top: 2px solid var(--dark-bg);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ========== UPLOAD STATUS ========== */
.upload-status {
    margin-top: 2rem;
    padding: 1.5rem;
    border-radius: 10px;
    text-align: center;
}

.upload-status.success {
    background: rgba(0, 255, 136, 0.1);
    border: 1px solid var(--primary-green);
    color: var(--primary-green);
}

.upload-status.error {
    background: rgba(255, 0, 136, 0.1);
    border: 1px solid #ff0088;
    color: #ff0088;
}

.upload-status h3 {
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

/* ========== FOOTER ========== */
.footer {
    background: var(--card-bg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 2rem 2rem;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1.5fr 1.2fr 1.2fr;
    gap: 2rem;
    align-items: flex-start;
}

.footer-logo {
    font-size: 1.3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-align: left;
    padding-bottom: 0.5rem;
    line-height: 1.2;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    align-items: flex-start;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    transition: all 0.3s ease;
    position: relative;
    line-height: 1.3;
}

.footer-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--primary-green);
    transition: width 0.3s ease;
}

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

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

.footer-social {
    text-align: left;
}

.footer-social p {
    color: var(--text-secondary);
    font-size: 0.8rem;
    line-height: 1.5;
    margin-bottom: 0.3rem;
}

.footer-social a {
    color: var(--primary-green);
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.footer-social a:hover {
    opacity: 0.8;
}

.footer-quick-links {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    text-align: left;
    align-items: flex-start;
}

.footer-quick-links-title {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--primary-green);
    margin-bottom: 0.2rem;
    line-height: 1.2;
}

.footer-quick-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.8rem;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    line-height: 1.3;
    position: relative;
}

.footer-quick-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--primary-green);
    transition: width 0.3s ease;
}

.footer-quick-links a:hover {
    color: var(--primary-green);
}

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

.footer-quick-links a::before {
    content: "→";
    opacity: 0;
    transform: translateX(-4px);
    transition: all 0.3s ease;
}

.footer-quick-links a:hover {
    color: var(--primary-green);
    padding-left: 6px;
}

.footer-quick-links a:hover::before {
    opacity: 1;
    transform: translateX(0);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
    .nav-container {
        padding: 1rem;
        position: relative;
        flex-wrap: wrap;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: calc(100% + 0.5rem);
        left: 1rem;
        right: 1rem;
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
        background: rgba(10, 10, 10, 0.96);
        border: 1px solid rgba(255, 255, 255, 0.12);
        border-radius: 12px;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
        z-index: 1001;
        margin-left: 0;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-link {
        padding: 0.35rem 0;
    }
    
    .hamburger {
        display: flex;
    }

    .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);
    }
    
    .nav-actions {
        display: none;
    }
    
    .upload-container {
        padding: 2rem;
        margin: 0 1rem;
    }
    
    .upload-title {
        font-size: 2.5rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .upload-title {
        font-size: 2rem;
    }
    
    .upload-container {
        padding: 1.5rem;
    }
}

/* ===== LIGHT THEME OVERRIDES ===== */
html[data-theme="light"] body {
    background: linear-gradient(145deg, #ecfdf5 0%, #eff6ff 50%, #faf5ff 100%) fixed;
}

html[data-theme="light"] .particle {
    background: var(--primary-green);
    opacity: 0.8;
    box-shadow: 0 0 8px rgba(16, 163, 71, 0.4);
}

html[data-theme="light"] .bg-animation {
    background: transparent;
}

html[data-theme="light"] .upload-container,
html[data-theme="light"] .upload-section,
html[data-theme="light"] .upload-box {
    background: rgba(255,255,255,0.96);
    border-color: rgba(5, 150, 105, 0.25);
    box-shadow: 0 4px 24px rgba(5, 150, 105, 0.10);
    color: var(--text-primary);
}
html[data-theme="light"] .upload-section:hover,
html[data-theme="light"] .upload-box:hover,
html[data-theme="light"] .upload-section.drag-over,
html[data-theme="light"] .upload-box.drag-over {
    border-color: var(--primary-green);
    box-shadow: 0 12px 40px rgba(5, 150, 105, 0.20);
}
html[data-theme="light"] .upload-btn {
    background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
    color: #ffffff;
    box-shadow: 0 0 20px rgba(5,150,105,0.35);
}
html[data-theme="light"] .footer {
    background: rgba(255,255,255,0.90);
    border-top: 1px solid rgba(5,150,105,0.18);
}
@media (max-width: 768px) {
    html[data-theme="light"] .nav-menu {
        background: rgba(255,255,255,0.98);
        border: 1px solid rgba(5,150,105,0.20);
        box-shadow: 0 10px 40px rgba(5,150,105,0.12);
    }
}