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

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #8b5cf6;
    --background: #0f172a;
    --surface: #1e293b;
    --surface-light: #334155;
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --success: #10b981;
    --border: #334155;
    --shadow: rgba(0, 0, 0, 0.3);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* View Management */
.view {
    display: none;
    animation: fadeIn 0.4s ease;
}

.view.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

/* Header */
.header {
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--surface) 0%, var(--surface-light) 100%);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 4px 6px var(--shadow);
}

.header-content h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    background: linear-gradient(135deg, #fff 0%, #94a3b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Files Grid */
.files-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 1rem;
    padding: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.file-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 1rem;
    padding: 1.25rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.file-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
}

.file-card:hover::before {
    opacity: 0.1;
}

.file-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: 0 8px 16px rgba(99, 102, 241, 0.2);
}

.file-card:active {
    transform: translateY(-2px);
}

.file-icon {
    font-size: 3rem;
    margin-bottom: 0.75rem;
    position: relative;
    z-index: 1;
}

.file-info {
    position: relative;
    z-index: 1;
}

.file-info h3 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-info p {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Login View */
.login-container {
    max-width: 420px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.lock-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

.login-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.login-subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.5;
}

#selectedFile {
    color: var(--primary);
    font-weight: 600;
}

/* Form */
.login-form {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 1.25rem;
    padding: 2rem;
    box-shadow: 0 8px 24px var(--shadow);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text);
}

.form-group input {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    color: var(--text);
    font-size: 1rem;
    transition: all 0.3s ease;
    font-family: inherit;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

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

.password-wrapper {
    position: relative;
    width: 100%;
}

.password-wrapper input {
    padding-right: 3rem;
}

.toggle-password {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    font-size: 1.25rem;
    line-height: 1;
}

.toggle-password:hover {
    color: var(--primary);
    transform: translateY(-50%) scale(1.1);
}

.toggle-password:active {
    transform: translateY(-50%) scale(0.95);
}

.eye-icon {
    display: block;
    user-select: none;
}

.submit-btn {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border: none;
    border-radius: 0.75rem;
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    font-family: inherit;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(99, 102, 241, 0.3);
}

.submit-btn:active {
    transform: translateY(0);
}

.submit-btn.loading .btn-text {
    opacity: 0;
}

.submit-btn.loading .btn-loader {
    opacity: 1;
}

.btn-loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    opacity: 0;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

.back-btn {
    width: 100%;
    padding: 0.875rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    color: var(--text);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    margin-top: 1rem;
    transition: all 0.3s ease;
    font-family: inherit;
}

.back-btn:hover {
    background: var(--surface);
    border-color: var(--text-secondary);
}

/* Download View */
.download-container {
    max-width: 420px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.download-animation {
    position: relative;
    margin-bottom: 2rem;
}

.download-icon {
    font-size: 4rem;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: bounce 1s ease-in-out infinite;
}

@keyframes bounce {

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

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

.progress-ring {
    position: relative;
    width: 200px;
    height: 200px;
}

.progress-ring svg {
    transform: rotate(-90deg);
}

.progress-ring-circle {
    fill: none;
    stroke: var(--primary);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 565.48;
    stroke-dashoffset: 565.48;
    transition: stroke-dashoffset 0.3s ease;
    filter: drop-shadow(0 0 8px rgba(99, 102, 241, 0.5));
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-top: 2rem;
}

.download-container h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.download-container p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
}

.download-stats {
    display: flex;
    gap: 2rem;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Mobile Optimizations */
@media (max-width: 640px) {
    .files-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 0.875rem;
        padding: 1rem;
    }

    .file-card {
        padding: 1rem;
    }

    .file-icon {
        font-size: 2.5rem;
    }

    .header-content h1 {
        font-size: 1.5rem;
    }

    .login-container {
        padding: 1.5rem 1rem;
    }

    .login-form {
        padding: 1.5rem;
    }

    .lock-icon {
        font-size: 3rem;
    }

    .login-header h2 {
        font-size: 1.5rem;
    }
}

@media (max-width: 380px) {
    .files-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}