:root {
    --bg: #0a0a0a;
    --surface: #141414;
    --surface-elevated: #1a1a1a;
    --text: #f0f0f0;
    --text-muted: #6b6b6b;
    --accent: #12C88F;
    --accent-secondary: #0012AE;
    --accent-tertiary: #FF00B3;
    --accent-glow: rgba(18, 200, 143, 0.3);
    --border: #2a2a2a;
    --success: #12C88F;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(0, 18, 174, 0.12) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(18, 200, 143, 0.08) 0%, transparent 40%);
    pointer-events: none;
    z-index: 0;
}

.container {
    width: 100%;
    max-width: 560px;
    position: relative;
    z-index: 1;
}

.header {
    text-align: center;
    margin-bottom: 2rem;
    animation: fadeInDown 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.mode-selection {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    animation: fadeInDown 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.1s backwards;
}

.mode-btn {
    flex: 1;
    padding: 1.25rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 2px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    text-align: center;
}

.mode-btn:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.mode-btn.active {
    border-color: var(--accent);
    background: var(--surface-elevated);
}

.mode-btn.active .mode-icon {
    color: var(--accent);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

.mode-icon {
    width: 32px;
    height: 32px;
    margin: 0 auto 0.75rem;
    color: var(--text-muted);
    transition: color 0.3s ease;
}

.mode-btn span {
    display: block;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text);
}

.mode-btn p {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.logo {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    display: block;
    filter: drop-shadow(0 4px 12px rgba(18, 200, 143, 0.3));
    animation: float 3s ease-in-out infinite;
}

.header h1 {
    font-family: 'Poppins', sans-serif;
    font-size: clamp(2rem, 6vw, 3rem);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--accent-tertiary);
}

.upload-zone {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 2px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.1s backwards;
}

.upload-zone::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--accent-glow) 0%, transparent 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.upload-zone:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.upload-zone:hover::before {
    opacity: 0.1;
}

.upload-zone.dragover {
    border-color: var(--accent);
    background: var(--surface-elevated);
}

.upload-zone.dragover::before {
    opacity: 0.15;
}

.upload-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 1.5rem;
    opacity: 0.6;
    transition: all 0.3s ease;
    color: var(--accent);
}

.upload-zone:hover .upload-icon {
    opacity: 1;
    transform: scale(1.1);
}

.upload-zone.loading .upload-icon {
    display: none;
}

.upload-zone.loading::after {
    content: '';
    position: absolute;
    width: 32px;
    height: 32px;
    top: 35%;
    left: 50%;
    margin-left: -16px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.upload-zone p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.upload-zone .formats {
    font-size: 0.75rem;
    color: var(--text-muted);
    opacity: 0.6;
}

#fileInput {
    display: none;
}

.file-info {
    display: none;
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    background: var(--surface-elevated);
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--success);
}

.file-info.visible {
    display: block;
    animation: fadeIn 0.3s ease;
}

.file-list {
    display: none;
    margin-top: 1.5rem;
    text-align: left;
    max-height: 200px;
    overflow-y: auto;
}

.file-list.visible {
    display: block;
    animation: fadeIn 0.3s ease;
}

.file-list-header {
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.file-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0;
    font-size: 0.8rem;
    color: var(--text);
    border-bottom: 1px solid var(--border);
}

.file-item:last-child {
    border-bottom: none;
}

.file-item svg {
    width: 16px;
    height: 16px;
    color: var(--accent);
    flex-shrink: 0;
}

.file-count {
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    background: var(--surface-elevated);
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--success);
    text-align: center;
}

.progress-zone {
    margin-top: 2rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 2px;
    padding: 1.5rem;
    display: none;
}

.progress-zone.visible {
    display: block;
    animation: fadeInUp 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.progress-header h3 {
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.progress-percent {
    font-size: 0.8rem;
    color: var(--accent);
    font-weight: 500;
}

.progress-bar {
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-secondary) 100%);
    width: 0%;
    transition: width 0.3s ease;
}

.progress-status {
    margin-top: 0.75rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
}

.result-list {
    list-style: none;
    margin-top: 1rem;
}

.result-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 0;
    font-size: 0.85rem;
    color: var(--text);
    border-bottom: 1px solid var(--border);
}

.result-item:last-child {
    border-bottom: none;
}

.result-item.success svg {
    color: var(--success);
}

.result-item.error svg {
    color: var(--accent-tertiary);
}

.result-item svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.download-btn {
    margin-top: 1.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.8rem;
    background: var(--surface-elevated);
    border: 1px solid var(--accent);
    color: var(--accent);
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'Poppins', sans-serif;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.download-btn:hover {
    background: var(--accent);
    color: var(--bg);
}

.download-btn svg {
    width: 16px;
    height: 16px;
}

.btn {
    width: 100%;
    padding: 1rem 2rem;
    margin-top: 1.5rem;
    font-family: 'Poppins', sans-serif;
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    background: linear-gradient(135deg, var(--accent) 0%, #0ea570 100%);
    color: var(--bg);
    border: none;
    border-radius: 2px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.2s backwards;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transform: translateX(-100%);
    transition: transform 0.5s ease;
}

.btn:hover::before {
    transform: translateX(100%);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--accent-glow);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn.loading {
    pointer-events: none;
    color: transparent;
}

.btn.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin-left: -10px;
    margin-top: -10px;
    border: 2px solid var(--bg);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.email-input-container {
    margin-top: 1.5rem;
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.15s backwards;
}

.email-input-container input {
    width: 100%;
    padding: 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 2px;
    color: var(--text);
    font-family: 'Poppins', sans-serif;
    font-size: 0.875rem;
    transition: all 0.3s ease;
}

.email-input-container input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.email-input-container input::placeholder {
    color: var(--text-muted);
}

.result-zone {
    margin-top: 2rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 2px;
    padding: 1.5rem;
    display: none;
    animation: fadeInUp 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.result-zone.visible {
    display: block;
}

.result-zone h3 {
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.result-zone h3::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.result-text {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text);
    white-space: pre-wrap;
    word-break: break-word;
}

.result-text.error {
    color: var(--accent-tertiary);
}

.result-actions {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.copy-btn, .continue-btn {
    padding: 0.5rem 1rem;
    font-size: 0.7rem;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: 'Poppins', sans-serif;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.copy-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
}

.copy-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.continue-btn {
    background: var(--accent);
    border: 1px solid var(--accent);
    color: var(--bg);
}

.continue-btn:hover {
    background: var(--accent-secondary);
    border-color: var(--accent-secondary);
}

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

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

@media (max-width: 480px) {
    body {
        padding: 1rem;
    }
    
    .upload-zone {
        padding: 2rem 1rem;
    }

    .logo {
        width: 60px;
        height: 60px;
    }
}