/* === CSS Variables (Color Palette & Fonts) === */
:root {
    --charcoal: #1f2b38;
    --charcoal-lighter: #34495e;
    --white: #ecf0f1;
    --green: #2ecc71;
    --lightblue: #3498db;
    --text-color: #bdc3c7;
    --heading-color: var(--white);
    --link-color: var(--lightblue);
    --link-hover-color: var(--green);
    --primary-color: var(--green);
    --secondary-color: var(--lightblue);
    --danger-color: #e74c3c;
    --border-color: #4a627a;
    --font-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --container-width: 1200px;
    --section-padding: 60px 0;
    --border-radius: 5px;
    --transition-speed: 0.3s ease;
}

/* === Basic Reset & Body Defaults === */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    background-color: var(--charcoal);
    color: var(--text-color);
}

.container {
    width: 90%;
    max-width: var(--container-width);
    margin: 0 auto;
}

/* === Typography & Buttons === */
h1, h2, h3, h4 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 0.75em;
    color: var(--heading-color);
}
h1 { font-size: 2.8rem; }
h2 { font-size: 2.2rem; }
h3 { font-size: 1.5rem; }

a { color: var(--link-color); text-decoration: none; transition: color var(--transition-speed); }
a:hover { color: var(--link-hover-color); }

.btn {
    display: inline-block;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    border: 1px solid transparent;
    padding: 10px 25px;
    font-size: 1rem;
    border-radius: var(--border-radius);
    transition: all var(--transition-speed);
}
.btn-primary { color: #fff; background-color: var(--primary-color); border-color: var(--primary-color); }
.btn-primary:hover { background-color: #27ae60; }
.btn-outline { color: var(--white); background-color: transparent; border-color: var(--white); }
.btn-outline:hover { color: var(--charcoal); background-color: var(--white); }
.btn-secondary { color: #fff; background-color: var(--secondary-color); border-color: var(--secondary-color); }
.btn-danger { background-color: var(--danger-color); color: white; }
.btn-large { padding: 15px 35px; font-size: 1.1rem; }
.btn-block { display: block; width: 100%; }
.btn-sm { padding: 5px 10px; font-size: 0.85rem; }


/* === Header & Navigation === */
.branding-header {
    padding: 15px 0;
    background-color: var(--charcoal);
    text-align: center;
}
.main-logo { max-width: 200px; height: auto; }

.site-header {
    padding: 10px 0;
    background-color: var(--charcoal-lighter);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.header-container { display: flex; justify-content: space-between; align-items: center; }
.main-nav { list-style: none; display: flex; gap: 20px; }
.main-nav .nav-link { color: var(--text-color); padding: 8px 0; position: relative; font-weight: 500; }
.main-nav .nav-link.active, .main-nav .nav-link:hover { color: var(--primary-color); }
.action-nav { display: flex; gap: 10px; align-items: center; }
.user-email { margin-right: 15px; opacity: 0.8; }


/* === Homepage & General Sections === */
.hero { padding: 80px 0; }
.hero-container { display: flex; align-items: center; gap: 40px; }
.hero-text { flex: 1; }
.hero-visual { flex: 1; }
.hero-visual img { border-radius: var(--border-radius); box-shadow: 0 10px 20px rgba(0,0,0,0.2); }
.slideshow { position: relative; overflow: hidden; border-radius: var(--border-radius); aspect-ratio: 16 / 9; }
.slideshow .slide { width: 100%; height: 100%; opacity: 0; position: absolute; transition: opacity 1s ease; }
.slideshow .slide.active { opacity: 1; }
.slideshow .slide img { width: 100%; height: 100%; object-fit: cover; }
.cta-buttons { display: flex; gap: 15px; margin-top: 2rem; }
.section-padding { padding: var(--section-padding); }
.bg-alternate { background-color: var(--charcoal-lighter); }
.section-header { text-align: center; margin-bottom: 40px; }


/* === Login/Register Forms === */
.form-container { display: flex; justify-content: center; align-items: center; padding: 60px 0; }
.form-box { background: var(--charcoal-lighter); padding: 40px; border-radius: var(--border-radius); width: 100%; max-width: 400px; border: 1px solid var(--border-color); }
.form-title { text-align: center; margin-bottom: 2rem; }
.form-group { margin-bottom: 1.5rem; }
.form-group label { display: block; margin-bottom: 0.5rem; }
.form-group input { width: 100%; padding: 12px; background: var(--charcoal); border: 1px solid var(--border-color); color: var(--white); border-radius: var(--border-radius); }
.form-footer { text-align: center; margin-top: 1.5rem; }
.error-message { color: var(--danger-color); text-align: center; margin-bottom: 1rem; }

/* === Dashboard === */
.dashboard-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 2rem; border-bottom: 1px solid var(--border-color); padding-bottom: 1rem; flex-wrap: wrap; gap: 1rem;}
.dashboard-overview-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 30px; margin-bottom: 2rem; }
.overview-card { background-color: var(--charcoal-lighter); padding: 20px; border-radius: var(--border-radius); }
.stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; margin: 15px 0; }
.stat-item { background-color: var(--charcoal); padding: 10px; border-radius: var(--border-radius); text-align: center; }
.stat-item span { font-weight: bold; font-size: 1.5rem; display: block; color: var(--primary-color); }
.quick-create h3 { text-align: center; }
.quick-create-buttons { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 15px; }
.btn-quick-create { background-color: var(--charcoal); border: 1px solid var(--border-color); color: var(--text-color); padding: 15px; text-align: center; border-radius: var(--border-radius); text-decoration: none; transition: all var(--transition-speed); }
.btn-quick-create:hover { background-color: var(--border-color); color: var(--white); }
.btn-quick-create i { display: block; font-size: 1.5rem; margin-bottom: 8px; }

.projects-section { margin-top: 2rem; }
.projects-header h3 { border-bottom: 1px solid var(--border-color); padding-bottom: 10px; }
.project-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 20px; margin-top: 1.5rem; }
.project-card { background: var(--charcoal-lighter); border-radius: var(--border-radius); display: flex; flex-direction: column; border: 1px solid var(--border-color); }
.card-header { padding: 15px; display: flex; justify-content: space-between; align-items: flex-start; }
.card-header h4 { margin: 0; color: var(--white); }
.project-status { font-size: 0.8rem; padding: 4px 10px; border-radius: 12px; color: white; background-color: var(--green); }
.card-body { padding: 15px; flex-grow: 1; border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); }
.card-footer { padding: 15px; display: flex; gap: 10px; align-items: center; }
.card-footer .btn-sm .fas { margin-right: 5px; }
.card-footer .btn-danger { margin-left: auto; }


/* === IDE LAYOUT (edit_project.html) === */
body.ide-page, .ide-container {
    height: 100vh;
    overflow: hidden;
}
.ide-container {
    display: flex;
    flex-direction: column;
}
.ide-main-grid {
    display: grid;
    grid-template-columns: 250px 5px 300px 5px 1fr 5px 350px;
    flex-grow: 1;
    overflow: hidden;
}
.ide-main-grid.preview-hidden {
    grid-template-columns: 250px 5px 300px 5px 1fr 0 0;
}
.panel {
    background-color: #2c3e50;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    height: 100%;
}
.panel-header {
    padding: 8px 12px;
    background-color: #34495e;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}
.panel-header h3 { font-size: 1rem; margin:0; }
.panel-header h3 .fas { margin-right: 8px; color: var(--primary-color); }
.panel-content { padding: 10px; overflow-y: auto; flex-grow: 1; }
.gutter-col { background-color: #4a627a; cursor: col-resize; }

/* IDE Specific Panels */
.file-manager-panel .panel-content { padding: 0; }
#file-list { list-style: none; padding: 0; margin: 0; }
#file-list li { padding: 8px 15px; cursor: pointer; border-bottom: 1px solid #34495e; display: flex; justify-content: space-between; align-items: center; }
#file-list li:hover { background-color: var(--charcoal-lighter); }
#file-list li.active { background-color: var(--secondary-color); color: white; }
.delete-file-btn { color: #e74c3c; display: none; }
#file-list li:hover .delete-file-btn { display: inline-block; }
.file-actions { padding: 10px; display: flex; gap: 5px; }
#new-filename { flex-grow: 1; }

.ai-panel { background-color: var(--charcoal); }
.ai-input-area { display: flex; padding: 10px; border-top: 1px solid var(--border-color); }
#ai-form { display: flex; width: 100%; gap: 5px; }
.ai-message { padding: 8px 12px; border-radius: 10px; max-width: 90%; line-height: 1.4; margin-bottom: 10px; }
.ai-message.user { background-color: var(--primary-color); color: var(--charcoal); align-self: flex-end; }
.ai-message.bot { background-color: var(--charcoal-lighter); color: var(--white); align-self: flex-start; }

.code-editor-panel .panel-content { padding: 0; }
.CodeMirror { height: 100%; font-size: 14px; }
#preview-iframe { width: 100%; height: 100%; border: none; background-color: white; }

.terminal-logs { flex-shrink: 0; height: 200px; border-top: 2px solid var(--border-color); display: flex; flex-direction: column; }
.terminal-logs .panel-header { cursor: row-resize; }
#log-output { background-color: #1e1e1e; color: #ccc; font-family: monospace; font-size: 13px; white-space: pre-wrap; padding: 10px; }

/* AI Mode Controls */
.ai-mode-controls { display: flex; gap: 5px; background-color: var(--charcoal); border-radius: var(--border-radius); padding: 3px; }
.ai-mode-controls input[type="radio"] { display: none; }
.ai-mode-controls label { padding: 2px 8px; font-size: 0.8rem; border-radius: var(--border-radius); cursor: pointer; }
.ai-mode-controls input[type="radio"]:checked + label { background-color: var(--secondary-color); color: white; }
#enable-ai-btn { display: none; }
.ide-container.ai-off #enable-ai-btn { display: inline-block; }
.ide-container.ai-off .ai-panel, .ide-container.ai-off #gutter-1 { display: none; }
.ide-container.ai-off .ide-main-grid { grid-template-columns: 250px 0 0 5px 1fr 5px 350px; }
.ide-container.ai-off .ide-main-grid.preview-hidden { grid-template-columns: 250px 0 0 5px 1fr 0 0; }
.ide-container.ai-full .ai-panel { border-left: 3px solid var(--danger-color); }


/* === Footer === */
.site-footer {
    padding: 30px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    opacity: 0.8;
}
/* === ADVANCED PROJECT EDITOR STYLES === */

.advanced-project-container {
    display: grid;
    grid-template-columns: 250px 1fr 300px; /* Palette, Canvas, Config */
    height: calc(100vh - 140px); /* Adjust based on your header/footer height */
    width: 100%;
    gap: 5px;
    padding: 5px;
}

.device-palette-panel, .topology-canvas-panel, .config-panel {
    display: flex;
    flex-direction: column;
    background-color: var(--charcoal-lighter);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.device-category {
    margin-bottom: 20px;
}

.device-category h4 {
    padding-bottom: 5px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 10px;
    color: var(--secondary-color);
}

.device-item {
    background-color: var(--charcoal);
    padding: 10px;
    margin-bottom: 5px;
    border-radius: var(--border-radius);
    cursor: grab;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: background-color var(--transition-speed);
}
.device-item:hover {
    background-color: var(--border-color);
}
.device-item i {
    color: var(--primary-color);
}

#topology-canvas {
    background-color: #222;
    position: relative;
    flex-grow: 1;
}

.canvas-placeholder {
    text-align: center;
    padding-top: 40px;
    opacity: 0.5;
}

.config-placeholder {
    opacity: 0.5;
}

/* Styles for devices dropped onto the canvas */
.canvas-device {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--white);
    cursor: move;
    font-size: 0.9rem;
    width: 80px;
    text-align: center;
}
.canvas-device i {
    font-size: 2.5rem;
    color: var(--lightblue);
}