:root {
    --bg-color: #0d1117;
    --text-color: #c9d1d9;
    --primary-color: #58a6ff;
    --primary-hover: #3182ce;
    --secondary-bg: rgba(22, 27, 34, 0.6);
    --border-color: rgba(48, 54, 61, 0.5);
    --glass-bg: rgba(22, 27, 34, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --success-color: #2ea043;
    --error-color: #f85149;
    --highlight: #bc8cff;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow-x: hidden;
}

/* Background Effects */
.background-effects {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.5;
    animation: float 10s infinite ease-in-out alternate;
}

.blob-1 {
    top: -10%;
    left: -10%;
    width: 50vw;
    height: 50vw;
    background: radial-gradient(circle, rgba(88,166,255,0.15) 0%, rgba(13,17,23,0) 70%);
}

.blob-2 {
    bottom: -10%;
    right: -10%;
    width: 40vw;
    height: 40vw;
    background: radial-gradient(circle, rgba(188,140,255,0.15) 0%, rgba(13,17,23,0) 70%);
    animation-delay: -5s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(30px, 30px) scale(1.1); }
}

.container {
    width: 100%;
    max-width: 800px;
    padding: 2rem;
    z-index: 1;
}

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

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.highlight {
    background: linear-gradient(90deg, var(--primary-color), var(--highlight));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: #8b949e;
    font-size: 1.1rem;
}

/* Glassmorphism Panel */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

/* Tabs */
.tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.tab-btn {
    background: transparent;
    border: none;
    color: #8b949e;
    font-size: 1.1rem;
    font-weight: 500;
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.tab-btn:hover {
    color: var(--text-color);
    background: rgba(255,255,255,0.05);
}

.tab-btn.active {
    color: var(--primary-color);
    background: rgba(88, 166, 255, 0.1);
}

.tab-content {
    display: none;
    animation: fadeIn 0.4s ease forwards;
}

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

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

/* Forms & Inputs */
.input-group {
    margin-bottom: 1.5rem;
}

.input-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 600px) {
    .input-grid {
        grid-template-columns: 1fr;
    }
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #e6edf3;
}

textarea {
    width: 100%;
    background: rgba(13, 17, 23, 0.8);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    padding: 1rem;
    font-family: 'Courier New', Courier, monospace;
    font-size: 1rem;
    resize: vertical;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.2);
}

/* Checkboxes */
.options-group {
    margin-bottom: 2rem;
    background: rgba(13, 17, 23, 0.4);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.options-group .label {
    margin-bottom: 1rem;
    font-weight: 500;
}

.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.checkbox-container {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
    font-size: 0.95rem;
}

.checkbox-container input {
    margin-right: 10px;
    accent-color: var(--primary-color);
    width: 18px;
    height: 18px;
}

/* Buttons */
.btn {
    width: 100%;
    padding: 1rem;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.primary-btn {
    background: linear-gradient(135deg, var(--primary-color), #2f81f7);
    color: white;
    box-shadow: 0 4px 15px rgba(88, 166, 255, 0.3);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(88, 166, 255, 0.4);
}

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

/* Results Section */
.results-container {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.results-container.hidden {
    display: none;
}

.result-card {
    background: rgba(13, 17, 23, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.result-card h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
    font-size: 1.1rem;
}

.result-value {
    font-family: 'Courier New', Courier, monospace;
    word-break: break-all;
    background: rgba(0,0,0,0.2);
    padding: 1rem;
    border-radius: 6px;
}

.label-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.label-flex label {
    margin-bottom: 0;
}

.btn-text {
    background: none;
    border: none;
    color: var(--primary-color);
    font-size: 0.85rem;
    cursor: pointer;
    text-decoration: underline;
    padding: 0;
}

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

.export-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
    margin-top: 1rem;
    margin-right: 0.5rem;
}

.export-btn:hover {
    background: rgba(255,255,255,0.05);
    border-color: var(--primary-color);
}

.export-controls {
    display: flex;
    justify-content: flex-end;
    border-top: 1px solid var(--border-color);
    margin-top: 1rem;
    padding-top: 0.5rem;
}

.alignment-view {
    font-family: 'Courier New', Courier, monospace;
    background: rgba(0,0,0,0.3);
    padding: 1rem;
    border-radius: 6px;
    overflow-x: auto;
    white-space: pre;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.mut-sub { color: #f2cc60; font-weight: bold; }
.mut-ins { color: #2ea043; font-weight: bold; }
.mut-del { color: #f85149; font-weight: bold; }

/* Table for Mutator / Codon */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th, .data-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    color: #8b949e;
    font-weight: 500;
}

/* Loading state */
.btn.loading {
    opacity: 0.7;
    pointer-events: none;
    position: relative;
}

.error-msg {
    color: var(--error-color);
    background: rgba(248, 81, 73, 0.1);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid rgba(248, 81, 73, 0.3);
    margin-top: 1rem;
}