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

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #edf5ff;
    --bg-hover: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --accent: #0f4ba5;
    --accent-hover: #005a9e;
    --border: #e2e8f0;
    --success: #4ec9b0;
    --error: #f48771;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

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

header h1 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

main {
    display: grid;
    gap: 2rem;
}

.input-section {
    background-color: var(--bg-secondary);
    border-radius: 8px;
    padding: 1.5rem;
    border: 1px solid var(--border);
}

.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    font-size: 0.95rem;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
}

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

.tab-btn.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

textarea {
    width: 100%;
    min-height: 200px;
    padding: 1rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9rem;
    resize: vertical;
    transition: border-color 0.2s ease;
}

textarea:focus {
    outline: none;
    border-color: var(--accent);
}

textarea::placeholder {
    color: var(--text-secondary);
}

.file-drop-zone {
    border: 2px dashed var(--border);
    border-radius: 8px;
    padding: 3rem 2rem;
    text-align: center;
    transition: all 0.2s ease;
    cursor: pointer;
}

.file-drop-zone:hover,
.file-drop-zone.drag-over {
    border-color: var(--accent);
    background-color: var(--bg-tertiary);
}

.upload-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 1rem;
    color: var(--text-secondary);
}

.file-drop-zone p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.btn {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

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

.file-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background-color: var(--bg-tertiary);
    border-radius: 6px;
    margin-top: 1rem;
}

.file-info.hidden {
    display: none;
}

.file-name {
    font-weight: 500;
    color: var(--text-primary);
}

.file-size {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.btn-remove {
    margin-left: auto;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
}

.btn-remove:hover {
    color: var(--error);
}

.options {
    display: flex;
    gap: 1.5rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
    cursor: pointer;
}

.results-section h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.hash-results {
    display: grid;
    gap: 1rem;
}

.hash-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
}

.hash-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.hash-name {
    font-weight: 600;
    color: var(--accent);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-copy {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    transition: color 0.2s ease;
}

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

.btn-copy svg {
    width: 18px;
    height: 18px;
}

.hash-value {
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.85rem;
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
    padding: 0.75rem;
    border-radius: 6px;
    word-break: break-all;
    line-height: 1.4;
    min-height: 2.5rem;
    display: flex;
    align-items: center;
}

footer {
    text-align: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: var(--success);
    color: var(--bg-primary);
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    font-weight: 500;
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    header h1 {
        font-size: 1.75rem;
    }

    .tabs {
        flex-wrap: wrap;
    }

    .tab-btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }

    textarea {
        min-height: 150px;
    }

    .hash-results {
        grid-template-columns: 1fr;
    }

    .hash-value {
        font-size: 0.8rem;
    }
}

@media (min-width: 769px) {
    .hash-results {
        grid-template-columns: repeat(2, 1fr);
    }
}