:root {
    /* ==== Antigravity Dark Theme ==== */
    --bg: #0f1115;
    --panel-bg: #1e222b;
    --panel-border: #2d333b;
    --panel-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #3b82f6; /* crisp blue */
    --accent-hover: #60a5fa;
    --accent-alt: #10b981; /* emerald green */
    --glow: rgba(59, 130, 246, 0.2);
    
    --input-bg: #0f1115;
    --input-border: #334155;
    --input-focus: #3b82f6;
    
    --font-main: 'Inter', sans-serif;
}

:root[data-theme="light"] {
    /* ==== Tokyo Light Theme ==== */
    --bg: #f8fafc;
    --panel-bg: #ffffff;
    --panel-border: #e2e8f0;
    --panel-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    
    --text-main: #1e293b;
    --text-muted: #64748b;
    --accent: #2563eb; 
    --accent-hover: #1d4ed8;
    --accent-alt: #059669; 
    --glow: rgba(37, 99, 235, 0.15);
    
    --input-bg: #f1f5f9;
    --input-border: #cbd5e1;
    --input-focus: #2563eb;
}

/* Theme Toggle Button */
.theme-toggle {
    position: absolute;
    top: 0;
    right: 0;
    background: transparent;
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    padding: 0.5rem;
    cursor: pointer;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}
.theme-toggle:hover {
    color: var(--text-main);
    background: var(--panel-bg);
}

/* =========================================
   GLOBAL RESET & BASE 
   ========================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

body {
    font-family: var(--font-main);
    color: var(--text-main);
    background: var(--bg);
    min-height: 100vh;
    padding: clamp(0.5rem, 3vw, 2rem);
    font-size: 16px;
    line-height: 1.5;
    overflow-x: hidden;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
}

/* =========================================
   HEADER & TYPOGRAPHY
   ========================================= */
.main-header {
    text-align: center;
    margin-bottom: 2rem;
}

.title-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.2rem;
}

.header-icon {
    width: clamp(2rem, 5vw, 3rem);
    height: clamp(2rem, 5vw, 3rem);
    object-fit: contain;
    filter: drop-shadow(0 0 10px var(--glow));
}

h1 {
    font-family: 'VT323', monospace;
    font-size: clamp(2.5rem, 5vw, 3.5rem); /* slightly larger for VT323 to look right */
    font-weight: 400;
    letter-spacing: 2px;
    margin-bottom: 0;
    color: #4ade80; /* fallback color */
    background: linear-gradient(90deg, #4ade80, #22c55e); /* retro green gradient */
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 10px rgba(74, 222, 128, 0.4); /* subtle glow */
}

.subtitle {
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: 400;
}

h2 {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-main);
}

/* =========================================
   LAYOUT DASHBOARD
   ========================================= */
.main-grid {
    display: grid;
    /* Responsive template: left sidebar min 160px */
    grid-template-columns: minmax(160px, 3.5fr) minmax(0, 6.5fr);
    gap: clamp(0.75rem, 2vw, 1.5rem);
    align-items: stretch;
}

.glass-panel {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    padding: clamp(0.75rem, 2.5vw, 1.5rem);
    border-radius: 12px;
    box-shadow: var(--panel-shadow);
    min-width: 0; /* Allows panel to shrink safely */
}

.panel-header {
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--panel-border);
}

/* =========================================
   FORM CONTROLS
   ========================================= */
.input-group {
    margin-bottom: 1rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.4rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
}

input[type="text"],
.custom-select {
    width: 100%;
    padding: 0.6rem 0.8rem;
    border: 1px solid var(--input-border);
    background: var(--input-bg);
    color: var(--text-main);
    font-family: inherit;
    font-size: 1rem;
    border-radius: 6px;
    outline: none;
    transition: all 0.2s ease;
    min-width: 0;
    text-overflow: ellipsis;
}

input[type="text"]:focus,
.custom-select:focus {
    border-color: var(--input-focus);
    box-shadow: 0 0 0 2px var(--glow);
}

.divider {
    height: 1px;
    background: var(--panel-border);
    margin: 1.5rem 0;
}

.segmented-control {
    display: flex;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 6px;
    overflow: hidden;
}

.segmented-control input[type="radio"] {
    display: none;
}

.segmented-control label {
    flex: 1;
    text-align: center;
    padding: 0.5rem 0;
    margin: 0;
    cursor: pointer;
    font-size: clamp(0.75rem, 1.5vw, 0.9rem);
    color: var(--text-muted);
    transition: all 0.2s;
    border-right: 1px solid var(--input-border);
}

.segmented-control label:last-child {
    border-right: none;
}

.segmented-control input[type="radio"]:checked + label {
    background: var(--accent);
    color: #fff;
    font-weight: 500;
}

/* =========================================
   RESULTS PANEL (RIGHT SIDE)
   ========================================= */
.results-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    min-width: 0; /* Allows flex container to shrink past chart bounds */
    height: 100%;
}

.primary-result {
    text-align: center;
    padding: clamp(0.75rem, 2.5vw, 1.5rem);
    background: var(--input-bg);
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    margin-bottom: 1rem;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
}

.result-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.result-value {
    font-size: clamp(1.2rem, 3.5vw, 2.5rem);
    font-weight: 600;
    color: var(--accent);
    text-shadow: 0 0 15px var(--glow);
    overflow-wrap: anywhere;
    word-break: break-all;
}

.secondary-results {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 1rem;
}

.sec-stat {
    display: flex;
    flex-direction: column;
    padding: 0.75rem;
    background: var(--input-bg);
    border: 1px solid var(--panel-border);
    border-radius: 6px;
    text-align: center;
    min-width: 0;
}

.sec-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
    font-weight: 500;
    word-break: break-word;
}

.sec-val {
    font-size: clamp(0.9rem, 2.5vw, 1.1rem);
    font-weight: 600;
    color: var(--accent-alt);
}

/* =========================================
   CHART
   ========================================= */
.chart-panel {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    min-height: 250px;
}

.chart-wrapper {
    position: relative;
    flex: 1; /* Chart.js handles responsive height nicely with a fixed container height */
    width: 100%;
    min-height: 0;
    overflow: hidden;
}

/* =========================================
   TABLE VIEW 
   ========================================= */
.schedule-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
    color: var(--text-main);
    text-align: right; /* numbers look better right-aligned */
}

.schedule-table th {
    background: var(--input-bg);
    color: var(--text-muted);
    font-weight: 600;
    padding: 0.75rem;
    border-bottom: 2px solid var(--panel-border);
    position: sticky;
    top: 0;
    z-index: 1;
}

.schedule-table th:first-child,
.schedule-table td:first-child {
    text-align: left; /* Keep period labels left aligned */
}

.schedule-table td {
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--panel-border);
}

.schedule-table tr:hover td {
    background-color: var(--glow);
}