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

:root {
    /* Dark Mode (Default) */
    --bg-main: #1e1e1e;
    --text-main: #fcfaff;
    --accent: #ea5c2a;
    --accent-hover: #d14a1b;
    --panel-bg: rgba(255, 255, 255, 0.05);
    --input-bg: #fcfaff;
    --input-text: #1e1e1e;
    --border-color: #ea5c2a;
    --shadow-color: rgba(0, 0, 0, 0.2);
    --header-shadow: rgba(0, 0, 0, 0.4);
    --button-bg: rgba(255, 255, 255, 0.05);
    --button-hover-bg: rgba(255, 255, 255, 0.3);
    --grid-color: rgba(255, 255, 255, 0.08);
}

body.light {
    /* Light Mode Overrides */
    --bg-main: #fcfaff;
    --text-main: #1e1e1e;
    --accent: #ea5c2a;
    --accent-hover: #d14a1b;
    --panel-bg: rgba(0, 0, 0, 0.05);
    --input-bg: #ffffff;
    --input-text: #1e1e1e;
    --border-color: #ea5c2a;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --header-shadow: rgba(0, 0, 0, 0.1);
    --button-bg: rgba(0, 0, 0, 0.05);
    --button-hover-bg: rgba(0, 0, 0, 0.1);
    --grid-color: rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    min-height: 100vh;
    overflow: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
    background-color: var(--bg-main);
    color: var(--text-main);
}

.container {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 20px;
    height: 100vh;
    padding: 20px;
    max-width: 2000px;
    margin: 0 auto;
}

.sidebar {
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 28px;
    overflow-y: auto;
    box-shadow: 0 20px 60px var(--shadow-color);
    transition: all 0.3s;
    background: var(--panel-bg);
    color: var(--text-main);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

body.light .sidebar {
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.sidebar::-webkit-scrollbar {
    width: 8px;
}

.sidebar::-webkit-scrollbar-track {
    background: var(--button-bg);
    border-radius: 4px;
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--accent);
    border-radius: 4px;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 24px;
}

.header-text {
    flex: 1;
}

h1 {
    font-size: 24px;
    margin-bottom: 4px;
    color: var(--accent);
    font-weight: 800;
}

.subtitle {
    font-size: 12px;
    color: var(--text-main);
    opacity: 0.7;
    font-weight: 500;
}

.theme-toggle {
    background: var(--button-bg);
    border: 1px solid var(--accent);
    border-radius: 8px;
    padding: 8px 12px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 11px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-main);
}

.theme-toggle:hover {
    background: var(--button-hover-bg);
    transform: scale(1.05);
    color: var(--accent);
}

.section {
    margin-bottom: 28px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
    opacity: 0.8;
}

.section:last-child {
    border-bottom: none;
}

.section-title {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent);
    margin-bottom: 14px;
}

.section-expandable {
    margin-bottom: 28px;
    padding-bottom: 0;
    border-bottom: 1px solid var(--border-color);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    padding: 14px 0;
    transition: all 0.3s;
}

.section-header:hover {
    color: var(--accent);
}

.section-header-title {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-main);
    opacity: 0.8;
}

.section-header:hover .section-header-title {
    color: var(--accent);
}

.expand-icon {
    font-size: 16px;
    font-weight: 700;
    transition: transform 0.3s;
    color: var(--accent);
}

.expand-icon.expanded {
    transform: rotate(180deg);
}

.section-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s ease-out;
    padding: 0;
}

.section-content.expanded {
    max-height: 600px;
    padding: 0 0 24px 0;
}

.preset-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 14px;
}

.preset-btn {
    background: var(--button-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 14px 10px;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 12px;
    font-weight: 600;
    color: var(--text-main);
    text-align: center;
}

body.light .preset-btn {
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.preset-btn:hover {
    background: var(--button-hover-bg);
    color: var(--accent);
    border-color: var(--accent);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px var(--shadow-color);
}

.preset-btn.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
    box-shadow: 0 4px 12px rgba(234, 92, 42, 0.4);
}

.btn-primary {
    width: 100%;
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 16px;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    border-radius: 12px;
    transition: all 0.3s;
    box-shadow: 0 6px 20px rgba(234, 92, 42, 0.3);
    margin-bottom: 8px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    background: var(--accent-hover);
    box-shadow: 0 10px 30px rgba(234, 92, 42, 0.5);
}

.btn-secondary {
    width: 100%;
    background: var(--button-bg);
    color: var(--text-main);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 14px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    border-radius: 10px;
    transition: all 0.3s;
    margin-bottom: 8px;
}

body.light .btn-secondary {
    border: 1px solid rgba(0, 0, 0, 0.1);
}

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

.radio-group {
    display: flex;
    background: var(--button-bg);
    border-radius: 10px;
    padding: 5px;
    gap: 5px;
}

.radio-option {
    flex: 1;
    position: relative;
}

.radio-option input {
    position: absolute;
    opacity: 0;
}

.radio-option label {
    display: block;
    padding: 12px;
    text-align: center;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-main);
    opacity: 0.7;
}

.radio-option input:checked+label {
    background: var(--bg-main);
    color: var(--accent);
    box-shadow: 0 2px 8px var(--shadow-color);
    opacity: 1;
}

.control-group {
    margin-bottom: 18px;
}

.control-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-main);
}

input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--button-bg);
    outline: none;
    -webkit-appearance: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(234, 92, 42, 0.4);
    transition: transform 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: none;
}

.value-display {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    padding: 5px 12px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 700;
    min-width: 50px;
    text-align: center;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
    padding: 10px;
    background: var(--button-bg);
    border-radius: 8px;
    transition: background 0.2s;
}

.checkbox-group:hover {
    background: var(--button-hover-bg);
}

.checkbox-group input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--accent);
}

.checkbox-group label {
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    color: var(--text-main);
}

.canvas-container {
    border-radius: 20px;
    overflow: hidden;
    position: relative;
    box-shadow: 0 20px 60px var(--shadow-color);
    transition: background 0.3s;
    background: var(--bg-main);
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
    cursor: grab;
    touch-action: none;
}

canvas:active {
    cursor: grabbing;
}

.canvas-info {
    position: absolute;
    top: 20px;
    left: 20px;
    backdrop-filter: blur(10px);
    padding: 14px 18px;
    border-radius: 12px;
    font-size: 12px;
    pointer-events: none;
    font-weight: 600;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s;
    background: var(--panel-bg);
    color: var(--text-main);
}

body.light .canvas-info {
    border-color: rgba(0, 0, 0, 0.1);
}

.canvas-controls {
    position: absolute;
    bottom: 20px;
    right: 20px;
    display: flex;
    gap: 10px;
}

.canvas-btn {
    backdrop-filter: blur(10px);
    color: var(--text-main);
    width: 44px;
    height: 44px;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
    font-size: 18px;
    font-weight: 700;
    border: 1px solid rgba(255, 255, 255, 0.3);
    background: var(--button-bg);
}

body.light .canvas-btn {
    border-color: rgba(0, 0, 0, 0.2);
}

.canvas-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 20px var(--shadow-color);
    background: var(--button-hover-bg);
    color: var(--accent);
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.modal-content {
    background: var(--bg-main);
    padding: 36px;
    border-radius: 24px;
    max-width: 650px;
    width: 90%;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 25px 80px rgba(0, 0, 0, 0.4);
    animation: slideUp 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }

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

.modal-content h2 {
    margin-bottom: 8px;
    color: var(--accent);
    font-size: 24px;
    font-weight: 800;
}

.modal-subtitle {
    color: var(--text-main);
    font-size: 14px;
    margin-bottom: 24px;
}

textarea {
    width: 100%;
    height: 420px;
    padding: 18px;
    font-family: 'SF Mono', 'Consolas', 'Monaco', monospace;
    font-size: 14px;
    background: var(--input-bg);
    color: var(--input-text);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    resize: vertical;
    line-height: 1.7;
    transition: border-color 0.3s;
}

textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(234, 92, 42, 0.1);
}

.modal-buttons {
    margin-top: 24px;
    display: flex;
    gap: 14px;
}

.modal-buttons button {
    flex: 1;
    padding: 16px;
    border: none;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
}

.cancel-btn {
    background: var(--button-bg);
    color: var(--text-main);
}

.cancel-btn:hover {
    background: var(--button-hover-bg);
    transform: translateY(-2px);
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.stat-card {
    background: var(--button-bg);
    padding: 16px;
    border-radius: 12px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

body.light .stat-card {
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.stat-value {
    font-size: 28px;
    font-weight: 800;
    color: var(--accent);
}

.stat-label {
    font-size: 11px;
    color: var(--text-main);
    opacity: 0.7;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 6px;
    font-weight: 700;
}

.color-scheme {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.color-option {
    aspect-ratio: 1;
    border-radius: 8px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
    height: 35px;
}

.color-option:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.color-option.active {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px white, 0 0 0 3px var(--accent);
    transform: scale(1.05);
}

.interval-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
    font-size: 12px;
}

.interval-table th,
.interval-table td {
    padding: 8px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.interval-table th {
    background: var(--button-bg);
    font-weight: 700;
    color: var(--text-main);
}

.structure-list {
    list-style: none;
    padding: 0;
}

.structure-item {
    background: var(--button-bg);
    padding: 10px 14px;
    margin-bottom: 8px;
    border-radius: 8px;
    font-size: 13px;
    border-left: 4px solid var(--accent);
}

.structure-item strong {
    color: var(--accent);
    display: block;
    margin-bottom: 4px;
}

.analysis-section {
    margin-bottom: 24px;
}

.analysis-section h3 {
    font-size: 16px;
    color: var(--text-main);
    margin-bottom: 12px;
    font-weight: 700;
}

@media (max-width: 1024px) {
    .container {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr;
        height: auto;
        min-height: 100vh;
    }

    .sidebar {
        max-height: none;
    }

    .canvas-container {
        min-height: 500px;
    }
}