@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;700&display=swap');

/* === CSS VARIABLES === */
:root {
    /* Colors */
    --color-bg-body: #161b22;
    --color-bg-dark: #121212;
    --color-bg-sidebar: #111;
    --color-bg-component: #1e1e1e;
    --color-bg-hover: #2a2a2a;
    --color-bg-accent: #005f87;
    --color-bg-tab-active: #1a3d2a;
    --color-border: #444;
    --color-border-accent: #00ff88;
    --color-border-panel: #30363d;
    --color-text-primary: #ccc;
    --color-text-muted: #888;
    --color-text-accent: #00ff88;
    --color-text-white: #fff;
    --color-text-dark: #333;
    --color-button: #238636;
    --color-button-disabled: #555;
    --color-connection: #333;
    --color-connection-selected: #007bff;
    --color-tooltip-bg: #333;
    --color-tooltip-text: #fff;

    /* Sizes */
    --radius-small: 4px;
    --radius-medium: 6px;
    --radius-large: 8px;
    --font-family-mono: 'JetBrains Mono', monospace;
    --font-family-code: 'Fira Code', monospace;
    --component-padding: 8px;
    --component-gap: 12px;
}

/* === RESET & BASE STYLES === */
* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: var(--font-family-mono);
    color: var(--color-text-primary);
    display: flex;
    flex-direction: row;
    min-height: 100vh;
    background: radial-gradient(circle at 30% 50%, rgba(0, 255, 136, 0.1), transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(255, 107, 53, 0.1), transparent 50%),
                var(--color-bg-body)
}

/* === LAYOUT === */
#page-container {
    display: flex;
    flex-direction: column;
    width: 100%;
}

#sd-header {
    width: 100%;
    padding: 12px 24px;
    font-weight: bold;
    color: var(--color-text-accent);
    border-bottom: 1px solid var(--color-text-dark);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-text {
    font-size: 24px;
    margin: 0;
                text-shadow: 0 0 10px rgba(0, 255, 136, 0.8);

}

#main-content {
    display: flex;
    flex-direction: row;
    height: 100%;
}

/* === SIDEBAR === */
#sidebar {
    width: 100%;
    background-color: var(--color-bg-sidebar);
    display: flex;
    flex-wrap: wrap;
    flex-direction: row;
    gap: var(--component-gap);
}

.sidebar-title {
    color: #8b949e;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 15px;
    padding-bottom: 8px;
    padding-left: 8px;
    border-bottom: 1px solid #303638;
}

/* === COMPONENT ICONS === */
.component-icon,
#arrow-tool {
    position: relative;
    padding: var(--component-padding) 12px;
    background-color: var(--color-bg-component);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-medium);
    text-align: center;
    cursor: grab;
    user-select: none;
    font-size: 16px;
    color: var(--color-text-primary);
    transition: background-color 0.1s ease;
}

.component-icon:hover,
#arrow-tool:hover {
    background-color: var(--color-bg-hover);
    border-color: var(--color-border-accent);
}

.component-icon:active,
#arrow-tool:active {
    cursor: grabbing;
}

#arrow-tool.active {
    background-color: var(--color-bg-accent);
    color: var(--color-text-white);
    border-color: var(--color-button);
}

/* === TOOLTIP === */
.tooltip {
    visibility: hidden;
    opacity: 0;
    position: absolute;
    top: 100%;
    left: 0;
    z-index: 10;
    background: var(--color-tooltip-bg);
    color: var(--color-tooltip-text);
    padding: 6px 8px;
    border-radius: var(--radius-small);
    white-space: nowrap;
    font-size: 14px;
    line-height: 1.4;
    margin-top: 4px;
    transition: opacity 0.2s;
}

.component-icon:hover .tooltip {
    visibility: visible;
    opacity: 1;
    z-index: 1000;
}

.component-icon.dragging .tooltip {
    display: none;
}

/* === CANVAS === */
#canvas-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    border-radius: var(--radius-large);
    border: 2px solid var(--color-border-panel);
    overflow: hidden;
    background: var(--color-bg-dark);
    margin: 12px 12px 12px 0;
    padding: 16px;
}

#canvas-container {
    flex: 1;
    position: relative;
    background: var(--color-bg-dark);
    height: 100%;
    margin-top: 16px;
}

#canvas {
    width: 100%;
    height: 90%;
    background: var(--color-bg-dark);
    border: 2px dashed var(--color-border-panel);
    border-radius: var(--radius-large);
}

.dropped {
    cursor: move;
}

.dropped.selected rect {
    stroke: #00bcd4;
    stroke-width: 2;
}

/* === TOOLBAR === */
#canvas-toolbar {
    position: absolute;
    top: 12px;
    left: 12px;
    z-index: 20;
    display: flex;
    gap: 8px;
    background: var(--color-bg-component);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-small);
    padding: 6px;
    box-shadow: 0 0 8px rgba(0, 0, 0, 0.4);
}

.toolbar-btn {
    background: none;
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
    padding: 6px 10px;
    border-radius: var(--radius-small);
    font-size: 14px;
    cursor: pointer;
    font-family: var(--font-family-mono);
}

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

.toolbar-btn.active {
    background-color: var(--color-bg-accent);
    color: var(--color-text-white);
    border-color: var(--color-button);
}

/* === PANELS === */
#info-panel {
    position: absolute;
    top: 12px;
    right: 12px;
    background: var(--color-bg-dark);
    color: var(--color-text-primary);
    padding: 1rem;
    border-radius: var(--radius-large);
    font-family: monospace;
    font-size: 14px;
    min-width: 220px;
    z-index: 10;
    border: 1px solid var(--color-text-dark);
    box-shadow: 0 0 8px rgba(0, 0, 0, 0.3);
}

#node-props-panel {
    position: absolute;
    width: 220px;
    background-color: var(--color-bg-sidebar);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-small);
    padding: 12px;
    color: var(--color-text-white);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.6);
    display: none;
    z-index: 10;
}

#node-props-panel h3 {
    margin-top: 0;
    font-size: 15px;
    color: var(--color-text-primary);
}

#node-props-panel .form-group {
    margin-bottom: 10px;
}

#node-props-panel label {
    display: block;
    font-weight: bold;
    margin-bottom: 4px;
}

#node-props-panel select {
    width: 100%;
    padding: 4px;
    font-size: 14px;
}

.prop-group {
    display: none;
    margin-bottom: 12px;
}

.prop-group label,
.prop-group input {
    display: block;
    width: 100%;
    margin-top: 6px;
    font-size: 13px;
}

.panel-title {
    font-weight: bold;
    color: var(--color-text-white);
    font-size: 15px;
    margin-bottom: 0.5rem;
}

.panel-metric {
    margin-bottom: 0.4rem;
}

.panel-metric .label {
    display: inline-block;
    width: 140px;
    color: var(--color-text-muted);
}

/* === INPUTS & BUTTONS === */
input[type="text"],
input[type="number"] {
    padding: 6px;
    background-color: #222;
    border: 1px solid var(--color-border);
    color: var(--color-text-white);
    border-radius: var(--radius-small);
    font-family: var(--font-family-code);
}

#node-props-save,
#run-button {
    margin-top: 8px;
    padding: 10px;
    background-color: var(--color-button);
    color: var(--color-text-white);
    border: none;
    border-radius: var(--radius-small);
    cursor: pointer;
    font-size: 14px;
}

#run-button:disabled,
#node-props-panel button:disabled {
    background-color: var(--color-button-disabled);
    cursor: not-allowed;
}

#github-login-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    background-color: #fff;
    color: #000000;
    text-decoration: none;
    border-radius: var(--radius-medium);
    font-weight: 500;
    font-family: var(--font-family-mono);
    font-size: 12px;
    border: 1px solid #2ea043;
    transition: background-color 0.2s ease;
    float: right;
}

#github-login-btn:hover {
    background-color: #ccc;
}

#github-login-btn img {
    width: 18px;
    height: 18px;
}

/* === TABS === */
.tabs {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.tab-labels {
    display: flex;
    cursor: pointer;
}

.tab-labels label {
    padding: 10px 20px;
    background: var(--color-bg-body);
    margin-right: 4px;
    margin-bottom: 20px;
    border-radius: var(--radius-small);
}

.tab-content {
    border-top: 1px solid var(--color-border-panel);
    padding: 20px 0 0;
    display: none;
    height: 100%;
}

input[name="tab"] {
    display: none;
}

#tab1:checked ~ .tabs .tab-labels label[for="tab1"],
#tab2:checked ~ .tabs .tab-labels label[for="tab2"],
#tab3:checked ~ .tabs .tab-labels label[for="tab3"] {
    background: var(--color-bg-tab-active);
    font-weight: bold;
    color: var(--color-text-accent);
}

#tab1:checked ~ .tabs #content1,
#tab2:checked ~ .tabs #content2,
#tab3:checked ~ .tabs #content3 {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

/* === CHALLENGE PANEL === */
#challenge-container {
    width: 15%;
    background: var(--color-bg-dark);
    margin: 12px 12px;
    border: 2px solid var(--color-border-panel);
    border-radius: var(--radius-large);
    padding: 0 12px;
}

.challenge-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.challenge-item {
    padding: 10px;
    margin: 5px 0;
    background: #21262d;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    border-left: 3px solid transparent;
    list-style: none;
}

.challenge-item:hover {
    background: #30363d;
}

.challenge-item.active {
    background: #1a3d2a;
    border-left-color: #00ff88;
}

.challenge-name {
    font-weight: 500;
    margin-bottom: 5px;
}

.challenge-difficulty {
    font-size: 0.8rem;
    color: #0b949e;
}

.challenge-difficulty.easy {
    color: #3fb950;
}

.challenge-difficulty.medium {
    color: #d29922;
}

.challenge-difficulty.hard {
    color: #f85149;
}

/* === REQUIREMENTS === */
.requirements-section {
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
}

.requirements-list {
    margin: 0;
    padding: 0;
    list-style: none;
}

.requirement-item {
    position: relative;
    padding: 8px 0 8px 25px;
    margin: 0;
    border-bottom: 1px solid #30363d;
}

.requirement-item:before {
    content: "✓";
    color: #00ff88;
    position: absolute;
    left: 0;
}

/* === MODAL === */
.modal {
    position: absolute;
    top: 30%;
    left: 50%;
    transform: translate(-50%, -30%);
    background: #121212;
    padding: 20px;
    border-radius: 8px;
    border: 1px solid #444;
    z-index: 999;
    color: #ccc;
}

.modal-content label {
    display: block;
    margin: 10px 0;
}

.modal-actions {
    margin-top: 10px;
    text-align: right;
}

.modal input,
.modal select {
    width: 100%;
    padding: 6px;
    margin-top: 4px;
    background: #222;
    border: 1px solid #444;
    color: #fff;
    border-radius: 4px;
}

/* === MISC === */
#score-panel {
    margin-top: 16px;
}

.userbox {
    display: flex;
    align-items: center;
    gap: 12px;
}
.avatar {
    width: 24px;
    height: 24px;
    border-radius: 12px;
}