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

:root {
    --color-primary: #6d28d9; /* Deep Purple */
    --color-primary-light: #8b5cf6;
    --color-primary-dark: #5b21b6;
    --color-secondary: #10b981; /* Emerald Green */
    --color-bg-dark: #111827; /* Dark Blue-Gray */
    --color-bg-light: #1f2937;
    --color-bg-panel: #374151;
    --color-text-primary: #f9fafb;
    --color-text-secondary: #9ca3af;
    --color-border: #4b5563;
    --color-success: #22c55e;
    --color-error: #ef4444;
    
    --font-primary: 'Inter', sans-serif;
    --font-mono: 'Fira Code', monospace;
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --transition-speed: 0.2s ease-in-out;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg-dark);
    color: var(--color-text-primary);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* --- APP LAYOUT --- */
.app-container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

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

.app-header .logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-primary-light);
}

.app-header .tagline {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    margin-top: 0.25rem;
}

.app-main {
    flex-grow: 1;
}

/* --- CRYPTO TOOL CARD --- */
.crypto-tool {
    background-color: var(--color-bg-light);
    border-radius: var(--radius-lg);
    padding: 2rem;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
}

.form-step {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.step-label {
    font-weight: 600;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* --- CUSTOM TOGGLE SWITCHES --- */
.toggle-switch, .action-toggle {
    display: flex;
    background-color: var(--color-bg-dark);
    border-radius: var(--radius-md);
    padding: 0.25rem;
    border: 1px solid var(--color-border);
}

.toggle-switch input, .action-toggle input {
    display: none;
}

.toggle-switch label, .action-toggle label {
    flex: 1;
    text-align: center;
    padding: 0.6rem 1rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition-speed);
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.toggle-switch input:checked + label,
.action-toggle input:checked + label {
    background-color: var(--color-primary);
    color: var(--color-text-primary);
    box-shadow: var(--shadow-md);
}

/* --- INPUT AREAS --- */
.textarea-wrapper {
    position: relative;
}

.input-area textarea {
    width: 100%;
    background-color: var(--color-bg-panel);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.8rem 2.5rem 0.8rem 1rem; /* Add padding for clear button */
    color: var(--color-text-primary);
    font-family: var(--font-primary);
    font-size: 1rem;
    resize: vertical;
    transition: var(--transition-speed);
}

.input-area textarea:focus {
    outline: none;
    border-color: var(--color-primary-light);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.3);
}

.clear-text-btn {
    position: absolute;
    top: 0.8rem;
    right: 0.8rem;
    background: none;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    font-size: 1.1rem;
    padding: 0;
    transition: color var(--transition-speed);
}

.clear-text-btn:hover {
    color: var(--color-text-primary);
}


/* --- FILE DROPZONE --- */
.file-dropzone {
    position: relative;
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-md);
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-speed);
}

.file-dropzone:hover, .file-dropzone.dragover {
    border-color: var(--color-primary-light);
    background-color: var(--color-bg-panel);
}

.file-input {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.file-dropzone-prompt i {
    font-size: 2rem;
    color: var(--color-text-secondary);
    margin-bottom: 1rem;
}

.file-dropzone-prompt p {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

#file-name-display {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

/* --- CONFIGURATION GRID --- */
.config-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.input-field {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-field label {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.password-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

#password_input {
    width: 100%;
    background-color: var(--color-bg-panel);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.7rem 3rem 0.7rem 1rem;
    color: var(--color-text-primary);
    font-size: 1rem;
    transition: var(--transition-speed);
}

#password_input:focus {
    outline: none;
    border-color: var(--color-primary-light);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.3);
}

.password-toggle {
    position: absolute;
    right: 0.5rem;
    background: none;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    font-size: 1rem;
    transition: color var(--transition-speed);
}

.password-toggle:hover {
    color: var(--color-text-primary);
}

/* --- SUBMIT BUTTON --- */
.submit-btn {
    background-color: var(--color-secondary);
    color: var(--color-bg-dark);
    border: none;
    border-radius: var(--radius-md);
    padding: 0.9rem 1.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-md);
}

.submit-btn:hover:not(:disabled) {
    background-color: #34d399; /* Lighter Emerald */
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.submit-btn:disabled {
    background-color: var(--color-bg-panel);
    color: var(--color-text-secondary);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}
#submit-btn-icon.fa-spin {
    animation: fa-spin 1s infinite linear;
}

/* --- OUTPUT SECTION --- */
.output-section {
    background-color: var(--color-bg-light);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--color-border);
    margin-top: 1.5rem;
    animation: fadeIn 0.5s ease;
}

.output-section h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--color-secondary);
}

.output-content-wrapper {
    position: relative;
    background-color: var(--color-bg-dark);
    border-radius: var(--radius-md);
    padding: 1.5rem;
}

.output-content {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    white-space: pre-wrap;
    word-break: break-all;
    max-height: 250px;
    overflow-y: auto;
    color: var(--color-text-secondary);
}
.output-image-content {
    display: none;
    text-align: center;
}
.output-image-content img {
    max-width: 100%;
    max-height: 300px;
    display: inline-block;
    border-radius: var(--radius-sm);
}

.utility-btn {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    background-color: var(--color-bg-panel);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    padding: 0.5rem 0.8rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 500;
    transition: var(--transition-speed);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}
#download-btn {
    right: 6.5rem; /* Position next to copy */
    display: none; /* Hide by default */
}
.utility-btn:hover {
    background-color: var(--color-primary);
    color: var(--color-text-primary);
    border-color: var(--color-primary);
}

/* --- STATUS MESSAGES --- */
.status-message {
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    margin-top: 1.5rem;
    border: 1px solid transparent;
    animation: fadeIn 0.5s ease;
}
.status-message.success {
    background-color: rgba(34, 197, 94, 0.1);
    color: var(--color-success);
    border-color: var(--color-success);
}
.status-message.error {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--color-error);
    border-color: var(--color-error);
}

/* --- FOOTER --- */
.app-footer {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

/* --- ANIMATIONS --- */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --- RESPONSIVE DESIGN --- */
@media (max-width: 768px) {
    .app-container {
        padding: 1rem;
    }
    .crypto-tool {
        padding: 1.5rem;
    }
    .config-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

@media (max-width: 480px) {
    .toggle-switch label, .action-toggle label {
        padding: 0.5rem;
        font-size: 0.9rem;
    }
    .config-grid {
        gap: 1.25rem;
    }
    .submit-btn {
        font-size: 1rem;
    }
    #download-btn {
        top: 3.2rem;
        right: 0.75rem;
    }
}