:root {
    --bg-main: #0a0a0f;
    --bg-glass: rgba(255, 255, 255, 0.03);
    --bg-glass-hover: rgba(255, 255, 255, 0.05);
    --border-glass: rgba(255, 255, 255, 0.08);
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --accent: #ec4899;
    --text-main: #ffffff;
    --text-muted: #9ca3af;
    --success: #10b981;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Background Effects */
.background-effects {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
}

.glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.5;
    animation: float 20s infinite alternate ease-in-out;
}

.glow-1 {
    top: -10%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: var(--primary);
}

.glow-2 {
    bottom: -10%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: var(--accent);
    animation-delay: -5s;
}

.glow-3 {
    top: 40%;
    left: 40%;
    width: 400px;
    height: 400px;
    background: #8b5cf6;
    opacity: 0.3;
    animation-delay: -10s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(50px, 50px) scale(1.1); }
    100% { transform: translate(-50px, 100px) scale(0.9); }
}

/* Common Components */
.glass-panel {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: 24px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

.hidden {
    display: none !important;
}

/* Typography */
h1 {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

h1 span {
    background: linear-gradient(to right, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
}

.logo i {
    color: var(--primary);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

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

/* Buttons */
button {
    cursor: pointer;
    font-family: inherit;
    border: none;
    outline: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary {
    background: var(--primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(99, 102, 241, 0.2);
}

.btn-outline {
    background: transparent;
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    border: 1px solid var(--border-glass);
}

.btn-outline:hover {
    background: var(--bg-glass-hover);
    border-color: rgba(255, 255, 255, 0.2);
}

/* Main Layout */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem 5%;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

/* Hero Section */
.hero {
    margin-bottom: 3rem;
}

.badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 20px;
    color: var(--primary);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.hero p {
    color: var(--text-muted);
    font-size: 1.125rem;
    max-width: 500px;
    margin: 0 auto;
}

/* Converter Box */
.converter-box {
    width: 100%;
    max-width: 800px;
    padding: 2rem;
    margin-bottom: 4rem;
    animation: slideUp 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}

.tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    overflow-x: auto;
    padding-bottom: 0.5rem;
}

.tab {
    background: transparent;
    color: var(--text-muted);
    padding: 0.75rem 1.25rem;
    border-radius: 12px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
}

.tab:hover {
    color: var(--text-main);
    background: var(--bg-glass);
}

.tab.active {
    background: var(--bg-glass-hover);
    color: var(--text-main);
    border: 1px solid var(--border-glass);
}

.tab.active i {
    color: var(--primary);
}

/* Upload Area */
.upload-area {
    border: 2px dashed var(--border-glass);
    border-radius: 16px;
    padding: 4rem 2rem;
    transition: all 0.3s;
    background: rgba(0, 0, 0, 0.2);
}

.upload-area.dragover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.upload-icon {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 1rem;
    animation: bounce 2s infinite ease-in-out;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.upload-content p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.file-limits {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 1rem;
}

/* Conversion Settings */
.conversion-settings {
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.file-info {
    display: flex;
    align-items: center;
    padding: 1rem 1.5rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-glass);
}

.file-info i.fa-file {
    font-size: 2rem;
    color: var(--primary);
    margin-right: 1rem;
}

.file-details {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    flex-grow: 1;
}

.file-name {
    font-weight: 500;
}

.file-size {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.btn-icon {
    background: transparent;
    color: var(--text-muted);
    font-size: 1.25rem;
}

.btn-icon:hover {
    color: #ef4444;
}

.format-selection {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    background: var(--bg-glass);
    padding: 1.5rem;
    border-radius: 12px;
}

.custom-select {
    appearance: none;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-glass);
    color: white;
    padding: 0.75rem 2.5rem 0.75rem 1rem;
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    cursor: pointer;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 1em;
}

.custom-select:focus {
    outline: none;
    border-color: var(--primary);
}

.convert-btn {
    flex-grow: 1;
    max-width: 200px;
}

/* Progress Area */
.progress-area {
    padding: 2rem 0;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
    font-weight: 500;
}

.progress-bar-container {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 4px;
    transition: width 0.3s ease;
    box-shadow: 0 0 10px var(--primary);
}

/* Success Area */
.success-area {
    text-align: center;
    padding: 2rem 0;
}

.success-icon {
    width: 80px;
    height: 80px;
    background: rgba(16, 185, 129, 0.1);
    border: 2px solid var(--success);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: var(--success);
    margin: 0 auto 1.5rem;
    animation: scaleIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes scaleIn {
    0% { transform: scale(0); }
    100% { transform: scale(1); }
}

.success-area h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.success-area p {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Features */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    width: 100%;
    max-width: 1000px;
}

.feature-card {
    padding: 2rem;
    text-align: left;
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary);
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.875rem;
    line-height: 1.6;
}

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    .navbar { flex-direction: column; gap: 1rem; }
    .nav-links { display: none; }
    .format-selection { flex-direction: column; align-items: stretch; }
    .convert-btn { max-width: none; }
    .action-buttons { flex-direction: column; }
}