/* Main Stylesheet - 3D Reutersvärd Triangle
 * Modern CSS architecture for WebGL visualization interface
 * @author Tatiana Barros
 * @version 4.0.0
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;700&display=swap');

:root {
    --bg: #07070b;
    --panel: rgba(255, 255, 255, 0.03);
    --muted: #a8a8b3;
    --accent: #64ffda;
    --max-width: 1200px;
    --gap: 1rem;
    --measure: 36ch;
    --panel-padding: 1.125rem;
}

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

html,
body {
    height: 100%
}

body {
    font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial;
    background: var(--bg);
    color: #fff;
}

/* Typographic improvements for readability */
body,
button,
input,
select {
    line-height: 1.45;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

p,
.info-text,
.muted {
    font-size: 0.98rem;
    color: var(--muted);
    max-width: var(--measure);
    /* optimal measure for readable paragraphs */
    text-align: left;
}

.header h1 {
    line-height: 1.05
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: calc(var(--gap)*1.5);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center
}

.header {
    text-align: center;
    margin-bottom: 1rem
}

.header h1 {
    font-size: 1.9rem;
    color: var(--accent);
}

.header .subtitle {
    color: var(--muted);
    margin-top: 0.35rem
}

#canvas-container {
    width: min(900px, 88vw);
    aspect-ratio: 1/1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: var(--panel);
    padding: 1rem;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.04)
}

#canvas-container canvas {
    max-width: 100%;
    max-height: 100%;
    display: block;
}

.controls {
    width: min(600px, 90%);
    margin-top: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem
}

.controls button {
    background: transparent;
    color: var(--muted);
    border: 1px solid rgba(255, 255, 255, 0.04);
    padding: .45rem .8rem;
    border-radius: 8px;
    cursor: pointer
}

.controls .btn-primary {
    background: var(--accent);
    color: #041014;
    padding: .5rem .9rem;
    border-radius: 8px;
    border: none
}

@media (max-width:640px) {
    .header h1 {
        font-size: 1.4rem
    }

    #canvas-container {
        width: 94vw
    }
}

/* Two-column responsive layout */
.main-content.three-column {
    display: grid;
    /* Two columns: left controls ~25%, center canvas fluid */
    grid-template-columns: minmax(220px, 25%) 1fr;
    gap: 1rem;
    width: 100%;
    align-items: start;
    margin-top: 1rem;
}

.left-column {
    background: rgba(255, 255, 255, 0.02);
    padding: calc(var(--panel-padding) * 0.72);
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.03);
    min-height: 320px;
}

.center-column {
    display: flex;
    align-items: center;
    justify-content: center;
}

.controls-left .controls-panel {
    display: flex;
    flex-direction: column;
    gap: .45rem;
}

.controls-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: .6rem;
}

.control-group label {
    display: block;
    font-size: .85rem;
    color: var(--muted);
    margin-bottom: .25rem;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: .35rem;
    margin-top: .45rem;
}

.tech-tag {
    background: rgba(255, 255, 255, 0.03);
    color: var(--muted);
    padding: .25rem .5rem;
    border-radius: 6px;
    font-size: .8rem;
}

.panel-title {
    color: var(--accent);
    font-size: 1.05rem;
    margin-bottom: .5rem;
}

.muted {
    color: var(--muted);
    font-size: .9rem;
    margin: .25rem 0
}

@media (max-width: 980px) {
    .main-content.three-column {
        grid-template-columns: 1fr;
    }

    .left-column {
        min-height: auto;
    }

    #canvas-container {
        width: 94vw
    }
}

/* Improve panel inner spacing and alignment */
.left-column>* {
    margin-bottom: 0.75rem;
}

.left-column .controls-panel {
    margin-top: 0.5rem;
}

/* Sub-head styling inside panels */
.left-column h3 {
    color: #fff;
    font-size: .98rem;
    margin-bottom: .35rem;
}

/* Small improvements for medium screens */
@media (min-width: 981px) and (max-width: 1200px) {
    .main-content.three-column {
        grid-template-columns: 240px 1fr;
        gap: 1rem;
    }

    #canvas-container {
        width: min(760px, 70vw)
    }
}

/* Controls improvements */
input[type="range"] {
    width: 100%;
    height: 2.2rem;
    accent-color: var(--accent);
}

.controls-buttons {
    display: flex;
    gap: .6rem;
}