:root {
    --bg-color: #0b0c1b;
    --panel-bg: rgba(20, 22, 45, 0.6);
    --panel-border: rgba(255, 255, 255, 0.08);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-blue: #38bdf8;
    --accent-yellow: #fbbf24;
    --accent-pink: #ec4899;
    --glow-color: rgba(56, 189, 248, 0.35);
    --border-radius: 16px;
    --transition-speed: 0.25s;
    --font-sans: 'Outfit', 'Noto Sans JP', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-sans);
    height: 100vh;
    min-height: 100vh;
    overflow: hidden; /* Prevent body scroll completely on PC */
    position: relative;
    padding-bottom: 0;
    
    /* Prevent accidental selection or touch callout on drag operations */
    -webkit-user-select: none;
    -webkit-touch-callout: none;
    user-select: none;
}

/* Allow text selection specifically for learning guides and cards */
.exam-card, .phase-description, .learning-step, .tooltip-text {
    -webkit-user-select: text;
    user-select: text;
}

/* Background effects */
.stars-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    background-image: 
        radial-gradient(1px 1px at 20px 30px, #fff, rgba(0,0,0,0)),
        radial-gradient(1.5px 1.5px at 40px 70px, #fff, rgba(0,0,0,0)),
        radial-gradient(1px 1px at 80px 120px, #fff, rgba(0,0,0,0)),
        radial-gradient(2px 2px at 150px 30px, rgba(255,255,255,0.8), rgba(0,0,0,0)),
        radial-gradient(1px 1px at 250px 200px, #fff, rgba(0,0,0,0));
    background-repeat: repeat;
    background-size: 300px 300px;
    opacity: 0.4;
}

.nebula-decor {
    position: fixed;
    border-radius: 50%;
    filter: blur(120px);
    z-index: -1;
    opacity: 0.15;
    pointer-events: none;
}

.blob-1 {
    width: 40vw;
    height: 40vw;
    background: radial-gradient(circle, var(--accent-blue) 0%, transparent 70%);
    top: -10vw;
    right: -5vw;
}

.blob-2 {
    width: 50vw;
    height: 50vw;
    background: radial-gradient(circle, var(--accent-pink) 0%, transparent 70%);
    bottom: -15vw;
    left: -10vw;
}

/* Layout Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 8px 16px;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

header {
    margin-bottom: 8px;
    position: relative;
    flex-shrink: 0;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.home-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 50%;
    color: var(--text-secondary);
    transition: all var(--transition-speed);
}

.home-btn:hover {
    color: var(--accent-blue);
    background: rgba(56, 189, 248, 0.1);
    border-color: rgba(56, 189, 248, 0.3);
    box-shadow: 0 0 10px rgba(56, 189, 248, 0.15);
}

.home-btn svg {
    width: 20px;
    height: 20px;
}

h1 {
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 4px;
    color: #ffffff;
}

h1 span {
    background: linear-gradient(135deg, var(--accent-blue) 30%, var(--accent-pink) 90%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.3;
    max-width: 700px;
}

/* Workspace Layout */
.workspace {
    flex: 1;
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 20px;
    min-height: 0; /* Enable height containment for flex grid */
    overflow: hidden;
}

@media (max-width: 900px) {
    body {
        overflow: auto; /* Allow scroll on small vertical mobile viewports */
        height: auto;
    }
    .container {
        height: auto;
        overflow: visible;
    }
    .workspace {
        grid-template-columns: 1fr;
        height: auto;
        overflow: visible;
    }
}

/* Panel Styles */
.panel {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--border-radius);
    padding: 16px 20px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
    min-height: 0;
    overflow-y: auto; /* Add internal scroll to individual panels only if content overflows */
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    padding-bottom: 14px;
}

.panel-header h2 {
    font-size: 1.15rem;
    font-weight: 600;
    color: #ffffff;
}

.tooltip-btn {
    font-size: 0.8rem;
    color: var(--accent-blue);
    cursor: pointer;
    background: rgba(56, 189, 248, 0.1);
    padding: 4px 8px;
    border-radius: 6px;
    transition: background var(--transition-speed);
}

.tooltip-btn:hover {
    background: rgba(56, 189, 248, 0.2);
}

/* Space View Canvas Area */
.canvas-container {
    position: relative;
    width: 100%;
    max-width: calc(100vh - 430px);
    max-height: calc(100vh - 430px);
    aspect-ratio: 1 / 1 !important;
    background: rgba(5, 6, 16, 0.4);
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.03);
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto;
}

#spaceCanvas, #eclipseSpaceCanvas, #advancedCanvas, #tideSpaceCanvas {
    width: 100% !important;
    height: 100% !important;
    max-width: 100% !important;
    max-height: 100% !important;
    object-fit: contain !important;
    display: block;
    cursor: grab;
}

#spaceCanvas:active, #eclipseSpaceCanvas:active, #advancedCanvas:active, #tideSpaceCanvas:active {
    cursor: grabbing;
}

/* Space Panel (Left Panel) layout on Desktop to ensure it is always scroll-free */
@media (min-width: 901px) {
    .space-panel {
        overflow: hidden !important;
    }
    .space-panel .canvas-container {
        flex: 1;
        aspect-ratio: 1 / 1 !important;
        width: 100%;
        max-width: calc(100vh - 390px) !important;
        max-height: calc(100vh - 390px) !important;
        height: auto !important;
        margin: 0 auto;
    }
}

.solar-ray-hint {
    position: absolute;
    bottom: 6px;
    right: 6px;
    background: rgba(15, 17, 36, 0.85);
    border: 1px solid rgba(251, 191, 36, 0.15);
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.7rem;
    line-height: 1.2;
    color: var(--accent-yellow);
    pointer-events: none;
    backdrop-filter: blur(4px);
    text-align: right;
}

/* Tooltip Styles */
.space-tooltip {
    position: absolute;
    top: 12px;
    left: 12px;
    right: 12px;
    background: rgba(15, 23, 42, 0.9);
    border: 1px solid rgba(56, 189, 248, 0.25);
    border-radius: 8px;
    padding: 10px 14px;
    color: var(--text-primary);
    font-size: 0.8rem;
    line-height: 1.4;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.4), 0 0 15px rgba(56, 189, 248, 0.1);
    z-index: 20;
    transition: opacity 0.5s ease, transform 0.5s ease, visibility 0.5s;
    pointer-events: auto;
    display: flex;
    gap: 8px;
    align-items: flex-start;
}

.space-tooltip.hidden {
    opacity: 0;
    transform: translateY(-8px);
    pointer-events: none;
    visibility: hidden;
}

.tooltip-close {
    position: absolute;
    top: 6px;
    right: 8px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.15rem;
    font-weight: 700;
    cursor: pointer;
    line-height: 1;
    padding: 2px 4px;
    transition: color 0.2s;
}

.tooltip-close:hover {
    color: var(--accent-pink);
}

.tooltip-icon {
    font-size: 1.05rem;
    flex-shrink: 0;
    margin-top: 1px;
}

.tooltip-text {
    flex: 1;
    padding-right: 14px; /* Space for close button */
}

.tooltip-text strong {
    color: var(--accent-blue);
}

/* Controls style */
.control-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.control-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.btn-grid {
    display: grid;
    gap: 8px;
}

.row-btn-grid {
    grid-template-columns: repeat(4, 1fr);
}

.extra-time-text {
    display: none;
}

@media (max-width: 480px) {
    .row-btn-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.preset-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
}

.preset-grid .preset-btn {
    padding: 4px 2px !important;
    font-size: 0.72rem !important;
    white-space: nowrap !important;
    border-radius: 6px !important;
}

.time-btn {
    padding: 5px 6px !important;
    font-size: 0.74rem !important;
    border-radius: 6px !important;
}

.btn {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    padding: 10px 14px;
    border-radius: 10px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-speed);
    text-align: left;
}

.btn:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
}

.btn.active {
    background: rgba(56, 189, 248, 0.15);
    border-color: var(--accent-blue);
    color: #ffffff;
    box-shadow: 0 0 12px var(--glow-color);
}

/* Slider Style */
.slider-container, .slider, .slider-val {
    -webkit-user-select: none !important;
    -moz-user-select: none !important;
    -ms-user-select: none !important;
    user-select: none !important;
    -webkit-touch-callout: none !important;
    -webkit-user-drag: none !important;
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 6px;
}

.slider {
    flex: 1;
    -webkit-appearance: none;
    height: 6px;
    border-radius: 9999px;
    background: rgba(255, 255, 255, 0.1);
    outline: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-blue);
    cursor: pointer;
    box-shadow: 0 0 10px var(--accent-blue);
    transition: transform 0.1s;
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.25);
}

.slider-val {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-blue);
    min-width: 170px;
    flex-shrink: 0;
    text-align: right;
    line-height: 1.25;
}

/* Tide Gauge UI Styles */
.tide-gauge-container {
    width: 45px;
    height: 70px;
    background: rgba(4, 4, 10, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 8px;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;
    padding-bottom: 4px;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.8);
    flex-shrink: 0;
}

.tide-gauge-bar {
    width: 100%;
    background: linear-gradient(180deg, var(--accent-blue) 0%, #1d4ed8 100%);
    position: absolute;
    bottom: 0;
    left: 0;
    transition: height 0.3s ease;
    box-shadow: 0 0 8px rgba(56, 189, 248, 0.5);
}

.tide-gauge-label {
    font-size: 0.65rem;
    font-weight: 700;
    color: #ffffff;
    z-index: 2;
    text-shadow: 0 1px 2px rgba(0,0,0,0.8);
    pointer-events: none;
    margin-bottom: 2px;
}

/* Moon Render Card */
.phase-display-card {
    background: linear-gradient(135deg, rgba(20, 22, 45, 0.8), rgba(10, 11, 25, 0.8));
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 12px;
    padding: 20px;
    display: block; /* Align items vertically (visual block top, text bottom) */
}

/* Horizontal Visual Wrap inside Card for PC */
.moon-render-container, 
.eclipse-render-container,
.sky-view-container {
    display: inline-block;
    vertical-align: middle;
}

.moon-render-container,
.eclipse-render-container {
    margin-right: 16px;
}

.sky-view-container {
    margin-right: 0;
}

.phase-info {
    display: block;
    width: 100%;
    margin-top: 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding-top: 14px;
    text-align: left;
}

@media (max-width: 600px) {
    .phase-display-card {
        padding: 12px;
    }

    .moon-render-container, 
    .eclipse-render-container,
    .sky-view-container {
        display: inline-block;
        vertical-align: top;
        margin-bottom: 8px;
    }

    .moon-render-container,
    .eclipse-render-container {
        width: 120px;
        height: 120px;
        margin-right: 16px;
    }

    .sky-view-container {
        width: calc(100% - 136px);
        height: 120px;
        min-width: 130px;
    }

    .phase-info {
        margin-top: 4px;
        border-top: 1px solid rgba(255, 255, 255, 0.05);
        padding-top: 8px;
    }

    .phase-info h3 {
        font-size: 1.15rem;
        margin-bottom: 4px;
    }

    .phase-description {
        font-size: 0.8rem;
    }
}

.moon-render-container {
    width: 150px;
    height: 150px;
    background: #04040a;
    border-radius: 50%;
    overflow: hidden;
    position: relative;
    box-shadow: inset 0 0 20px rgba(0,0,0,0.9), 0 0 25px rgba(255,255,255,0.05);
    flex-shrink: 0;
}

.eclipse-render-container {
    width: 150px;
    height: 150px;
    background: #020205;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    overflow: hidden;
    position: relative;
    box-shadow: inset 0 0 20px rgba(0,0,0,0.9), 0 0 15px rgba(255,255,255,0.02);
    flex-shrink: 0;
}

.sky-view-container {
    width: 200px;
    height: 150px;
    background: #04040a;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.06);
    overflow: hidden;
    position: relative;
    box-shadow: inset 0 0 15px rgba(0,0,0,0.8);
    flex-shrink: 0;
}

#skyCanvas,
#moonRenderCanvas,
#eclipseRenderCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
}

.phase-info {
    flex: 1;
}

.phase-info h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--accent-yellow);
    margin-bottom: 6px;
}

.phase-description {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Exam Dashboard Card */
.exam-card {
    background: rgba(251, 191, 36, 0.03);
    border: 1px solid rgba(251, 191, 36, 0.15);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.exam-card-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--accent-yellow);
    letter-spacing: 0.02em;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid rgba(251, 191, 36, 0.1);
    padding-bottom: 8px;
}

.exam-table {
    width: 100%;
    border-collapse: collapse;
}

.exam-table th, .exam-table td {
    padding: 8px 0;
    font-size: 0.85rem;
    text-align: left;
}

.exam-table th {
    color: var(--text-secondary);
    font-weight: 500;
    width: 130px;
}

.exam-table td {
    color: var(--text-primary);
    font-weight: 600;
}

.highlight-val {
    color: var(--accent-blue) !important;
}

.exam-tip {
    background: rgba(255, 255, 255, 0.03);
    border-left: 3px solid var(--accent-yellow);
    padding: 10px 12px;
    border-radius: 0 8px 8px 0;
    font-size: 0.8rem;
    line-height: 1.4;
    color: var(--text-secondary);
}

.exam-tip strong {
    color: var(--accent-yellow);
    display: block;
    margin-bottom: 2px;
}

/* Mode Tabs styling */
.mode-tabs {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.mode-tab-btn {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 9999px;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.mode-tab-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

.mode-tab-btn.active {
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.2), rgba(236, 72, 153, 0.2));
    border-color: var(--accent-blue);
    color: #ffffff;
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.25);
}

/* Animation control bar */
.anim-control-bar {
    display: flex;
    align-items: center;
    gap: 14px;
    background: rgba(255, 255, 255, 0.02);
    padding: 10px 16px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.04);
}

.ctrl-btn {
    flex: 1;
    text-align: center;
    justify-content: center;
}

.active-green {
    background: rgba(16, 185, 129, 0.15) !important;
    border-color: #10b981 !important;
    color: #10b981 !important;
    box-shadow: 0 0 10px rgba(16, 185, 129, 0.2);
}

.active-green:hover {
    background: rgba(16, 185, 129, 0.25) !important;
}

.days-counter {
    font-size: 1rem;
    font-weight: 700;
    color: var(--accent-blue);
    min-width: 140px;
    text-align: right;
}

/* Advanced status card */
.advanced-status-card {
    background: rgba(56, 189, 248, 0.05);
    border: 1px solid rgba(56, 189, 248, 0.12);
    border-radius: 12px;
    padding: 18px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.advanced-status-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
}

/* Learning Steps */
.learning-step {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.learning-step:last-child {
    border-bottom: none;
}

.step-num {
    background: var(--accent-blue);
    color: #0b0c1b;
    font-weight: 800;
    font-size: 0.85rem;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 2px;
    box-shadow: 0 0 8px rgba(56, 189, 248, 0.4);
}

.step-text {
    font-size: 0.82rem;
    line-height: 1.5;
    color: var(--text-secondary);
}

.step-text strong {
    color: var(--text-primary);
}

/* iPad Landscape scroll-free layout optimization (height <= 780px) */
@media (max-height: 785px) and (min-width: 768px) {
    body {
        padding-bottom: 0 !important;
        overflow: hidden; /* Prevent body scrolling entirely on desktop/tablet layout */
    }

    .container {
        padding: 6px 12px !important;
        max-width: 100vw;
        height: 100vh;
        display: flex;
        flex-direction: column;
        justify-content: flex-start;
        overflow: hidden;
    }

    header {
        margin-bottom: 4px !important;
    }

    h1 {
        font-size: 1.4rem !important;
        margin-bottom: 0px !important;
    }

    .subtitle {
        font-size: 0.72rem !important;
        line-height: 1.15 !important;
        margin-top: 1px !important;
    }

    .mode-tabs {
        margin-top: 4px !important;
        gap: 4px !important;
    }

    .mode-tab-btn {
        padding: 5px 10px !important;
        font-size: 0.75rem !important;
    }

    .workspace {
        flex: 1;
        display: grid;
        grid-template-columns: 1.15fr 0.85fr;
        gap: 12px !important;
        min-height: 0; /* Important for flex/grid inner height scaling */
        overflow: hidden;
    }

    .panel {
        padding: 8px 12px !important;
        gap: 6px !important;
        height: 100% !important;
        min-height: 0;
        overflow: hidden !important;
    }

    .control-panel {
        display: flex !important;
        flex-direction: column !important;
    }

    /* Scroll only the exam guide card inside the control panel to keep controls fixed */
    .control-panel .exam-card {
        flex: 1 !important;
        min-height: 100px !important;
        overflow-y: auto !important;
        padding-right: 4px !important;
    }

    .panel-header {
        padding-bottom: 4px !important;
    }

    .panel-header h2 {
        font-size: 0.85rem !important;
    }

    /* Keep Canvas containers small enough to prevent overflow while strictly maintaining 1:1 aspect ratio */
    .canvas-container {
        flex: 1; /* Automatically fill vertical space up to panel boundaries */
        aspect-ratio: 1 / 1 !important; /* Keep it strictly 1:1 square */
        width: 100%;
        max-width: calc(100vh - 365px) !important;
        max-height: calc(100vh - 365px) !important;
        height: auto !important; /* Allow dynamic height calc to fit without scrolling */
        min-height: 100px;
        margin: 0 auto;
    }

    #spaceCanvas, #eclipseSpaceCanvas, #advancedCanvas, #tideSpaceCanvas {
        height: 100% !important;
        width: 100% !important;
        max-height: 100% !important;
        max-width: 100% !important;
    }

    .space-controls {
        margin-top: 0 !important;
    }

    .control-group {
        gap: 4px !important;
    }

    .control-group label {
        font-size: 0.78rem !important;
    }

    .slider-container {
        margin-top: 2px !important;
        gap: 8px !important;
    }

    .slider-val {
        font-size: 0.8rem !important;
        min-width: 120px !important;
    }

    .btn-grid {
        gap: 4px !important;
    }

    .row-btn-grid {
        grid-template-columns: repeat(4, 1fr) !important;
    }

    .extra-time-text {
        display: none !important;
    }

    .preset-grid {
        grid-template-columns: repeat(4, 1fr) !important; /* Spread presets horizontally */
    }

    .btn {
        padding: 5px 4px !important;
        font-size: 0.72rem !important;
        border-radius: 5px !important;
        text-align: center !important;
    }

    /* Controls right-side column panel elements */
    .phase-display-card {
        padding: 10px !important;
        gap: 12px !important;
    }

    .phase-info {
        margin-top: 8px !important;
        padding-top: 6px !important;
    }

    .phase-info h3 {
        font-size: 1.05rem !important;
        margin-bottom: 2px !important;
    }

    .phase-description {
        font-size: 0.75rem !important;
        line-height: 1.3 !important;
    }

    .exam-card {
        padding: 10px 12px !important;
        gap: 6px !important;
    }

    .exam-card-title {
        font-size: 0.85rem !important;
        padding-bottom: 4px !important;
    }

    .exam-table th, .exam-table td {
        padding: 4px 0 !important;
        font-size: 0.75rem !important;
    }

    .exam-table th {
        width: 110px !important;
    }

    .exam-tip {
        padding: 6px 8px !important;
        font-size: 0.72rem !important;
    }
    
    .anim-control-bar {
        padding: 6px 10px !important;
        gap: 8px !important;
        border-radius: 8px !important;
    }
    
    .days-counter {
        font-size: 0.85rem !important;
        min-width: 100px !important;
    }

    .advanced-status-card {
        padding: 10px !important;
        gap: 2px !important;
    }

    .advanced-status-card h3 {
        font-size: 0.95rem !important;
    }

    .learning-step {
        gap: 8px !important;
        padding: 4px 0 !important;
    }

    .step-num {
        width: 16px !important;
        height: 16px !important;
        font-size: 0.75rem !important;
    }

    .step-text {
        font-size: 0.72rem !important;
        line-height: 1.3 !important;
    }
}

/* Floating Toggle Switch in Canvas Container */
.tide-vector-toggle-container {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(15, 23, 42, 0.75);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 20px;
    padding: 4px 10px;
    display: flex;
    align-items: center;
    gap: 8px;
    pointer-events: auto;
    z-index: 10;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
    backdrop-filter: blur(4px);
}

.tide-vector-toggle-container .toggle-label {
    font-size: 0.72rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.85);
    user-select: none;
}

/* Switch styling */
.switch {
    position: relative;
    display: inline-block;
    width: 34px;
    height: 20px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.switch-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #4b5563;
    transition: .3s;
    border-radius: 20px;
}

.switch-slider:before {
    position: absolute;
    content: "";
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .3s;
    border-radius: 50%;
}

input:checked + .switch-slider {
    background-color: #06b6d4; /* Align with cyan color of moon tide force */
}

input:checked + .switch-slider:before {
    transform: translateX(14px);
}

/* ==========================================
   MOBILE VIEWPORT ONE-SCREEN LAYOUT FOR BASIC MODE
   ========================================== */
@media (max-width: 600px) {
    /* Reorganize mode switching tabs to a 2x2 grid on mobile viewports */
    .mode-tabs {
        display: grid !important;
        grid-template-columns: 1fr 1fr !important;
        gap: 6px !important;
        margin-top: 10px !important;
    }
    
    .mode-tab-btn {
        padding: 8px 4px !important;
        font-size: 0.76rem !important;
        border-radius: 8px !important;
        text-align: center !important;
    }

    /* Optimize basic mode workspace to stack visualizers vertically, keeping space view large */
    #workspaceBasic {
        display: grid;
        grid-template-columns: 1fr !important; /* Single column grid */
        gap: 12px !important;
        padding: 8px !important;
    }
    
    /* Disregard panel wraps to allow direct child grid placement */
    #workspaceBasic .panel {
        display: contents !important;
    }
    
    /* Row 1: Header controls */
    #workspaceBasic .space-panel .panel-header {
        grid-column: 1 !important;
        grid-row: 1 !important;
        padding-bottom: 8px !important;
    }
    #workspaceBasic .space-panel .panel-header h2 {
        font-size: 0.8rem !important;
        white-space: nowrap !important;
    }
    #workspaceBasic .extra-header-text {
        display: none !important;
    }
    #workspaceBasic .header-controls {
        gap: 6px !important;
    }
    #workspaceBasic .header-controls .toggle-container span {
        font-size: 0.7rem !important;
    }
    #workspaceBasic #btnAdvanceDay {
        font-size: 0.68rem !important;
        padding: 4px 6px !important;
    }
    
    /* Second header is redundant */
    #workspaceBasic .control-panel .panel-header {
        display: none !important;
    }
    
    /* Row 2: Space Canvas (Kept large for easy drag interaction) */
    #workspaceBasic .space-panel .canvas-container {
        grid-column: 1 !important;
        grid-row: 2 !important;
        width: 100% !important;
        max-width: 380px !important; /* Span full viewport width up to 380px */
        aspect-ratio: 1 !important;
        margin: 0 auto !important;
        background: var(--panel-bg) !important;
        border: 1px solid var(--panel-border) !important;
        border-radius: 12px !important;
        padding: 12px !important;
        box-sizing: border-box !important;
        position: relative !important;
    }
    
    /* Row 3: Earth's perspective visualizer card (Houses both moon render and sky side-by-side) */
    #workspaceBasic .control-panel .phase-display-card {
        grid-column: 1 !important;
        grid-row: 3 !important;
        width: 100% !important;
        max-width: 380px !important;
        margin: 0 auto !important;
        padding: 10px !important;
        box-sizing: border-box !important;
        background: var(--panel-bg) !important;
        border: 1px solid var(--panel-border) !important;
        border-radius: 12px !important;
        display: block !important;
        text-align: center !important;
    }
    
    /* Container style overrides for side-by-side display inside card */
    #workspaceBasic .moon-render-container {
        display: inline-block !important;
        vertical-align: middle !important;
        width: 90px !important;
        height: 90px !important;
        margin: 0 10px 0 0 !important;
    }
    #workspaceBasic #moonRenderCanvas {
        width: 90px !important;
        height: 90px !important;
    }
    
    #workspaceBasic .sky-view-container {
        display: inline-block !important;
        vertical-align: middle !important;
        width: 120px !important; /* 4:3 Aspect ratio (120px : 90px) */
        height: 90px !important;
        margin: 0 !important;
    }
    #workspaceBasic #skyCanvas {
        width: 120px !important;
        height: 90px !important;
    }
    
    /* Text elements styling */
    #workspaceBasic .phase-info {
        margin-top: 0px !important;
        padding-top: 6px !important;
        font-size: 0.72rem !important;
        text-align: center !important;
        border-top: 1px dashed rgba(255, 255, 255, 0.1) !important;
        width: 100% !important;
        display: block !important;
    }
    #workspaceBasic .phase-info h3 {
        font-size: 0.78rem !important;
        margin-top: 0px !important;
        margin-bottom: 2px !important;
    }
    #workspaceBasic .phase-description {
        display: block !important;
        margin: 0 !important;
        line-height: 1.35 !important;
    }
    
    /* Row 4 & 5 & 6: Controls (sliders & buttons) spanning full width */
    #workspaceBasic .space-panel .space-controls {
        display: contents !important;
    }
    
    /* [Row 4] Observer time controls */
    #workspaceBasic .time-controls-group {
        grid-column: 1 !important;
        grid-row: 4 !important;
        background: var(--panel-bg) !important;
        border: 1px solid var(--panel-border) !important;
        border-radius: 12px !important;
        padding: 12px !important;
        display: flex !important;
        flex-direction: column !important;
    }
    
    #workspaceBasic .time-controls-group label {
        font-size: 0.76rem !important;
        margin-bottom: 4px !important;
    }
    #workspaceBasic .time-controls-group .slider-container {
        margin-bottom: 8px !important;
    }
    #workspaceBasic .time-controls-group .row-btn-grid {
        grid-template-columns: repeat(4, 1fr) !important; /* Force 4 columns on mobile */
        gap: 6px !important;
    }
    #workspaceBasic .space-controls .time-btn {
        padding: 6px 4px !important;
        font-size: 0.7rem !important;
        text-align: center !important;
        border-radius: 6px !important;
    }
    #workspaceBasic .space-controls .extra-time-text {
        display: none !important;
    }

    /* [Row 5] Moon slider control group */
    #workspaceBasic .moon-slider-group {
        grid-column: 1 !important;
        grid-row: 5 !important;
        background: var(--panel-bg) !important;
        border: 1px solid var(--panel-border) !important;
        border-bottom: none !important;
        border-radius: 12px 12px 0 0 !important;
        padding: 12px 12px 6px 12px !important;
        margin-top: 0 !important;
    }
    #workspaceBasic .moon-slider-group label {
        font-size: 0.76rem !important;
        margin-bottom: 4px !important;
    }
    
    /* [Row 6] Moon Phase Preset buttons (Placed directly below moon slider) */
    #workspaceBasic .preset-controls-group {
        grid-column: 1 !important;
        grid-row: 6 !important;
        background: var(--panel-bg) !important;
        border: 1px solid var(--panel-border) !important;
        border-top: none !important;
        border-radius: 0 0 12px 12px !important;
        padding: 6px 12px 12px 12px !important;
        margin-top: -12px !important; /* Negate the 12px grid gap to merge visual borders */
    }
    #workspaceBasic .preset-controls-group label {
        display: none !important; /* Hide redundant label after merge */
    }
    #workspaceBasic .preset-grid {
        grid-template-columns: repeat(4, 1fr) !important; /* Force 4 columns x 2 rows on mobile */
        gap: 6px !important;
    }
    #workspaceBasic .preset-btn {
        padding: 6px 2px !important;
        font-size: 0.68rem !important;
        text-align: center !important;
        border-radius: 6px !important;
    }
    
    #workspaceBasic .slider-val {
        font-size: 0.72rem !important;
        min-width: 95px !important;
        font-variant-numeric: tabular-nums !important;
        line-height: 1.25 !important;
    }
    #workspaceBasic #observerTimeText {
        min-width: 45px !important; /* 12:00 like formatted short string allows small minimum width */
    }
    
    /* Row 7: Study cards at the very bottom */
    #workspaceBasic .control-panel .exam-card {
        grid-column: 1 !important;
        grid-row: 7 !important;
        margin-top: 4px !important;
    }

    /* All workspaces stack vertically on mobile */
    .workspace {
        grid-template-columns: 1fr !important;
        overflow-y: auto !important;
    }

    /* Target h2 in all panels inside any workspace to ensure title sizes are optimized */
    .workspace .panel-header h2 {
        font-size: 0.8rem !important;
    }
    #workspaceAdvanced .anim-control-bar {
        padding: 4px 8px !important;
        gap: 6px !important;
    }
    #workspaceAdvanced .anim-control-bar .ctrl-btn {
        font-size: 0.72rem !important;
        padding: 4px 8px !important;
    }
    #workspaceAdvanced .days-counter {
        font-size: 0.72rem !important;
        min-width: unset !important;
    }
    #workspaceAdvanced .step-btn {
        font-size: 0.68rem !important;
        padding: 5px 2px !important;
        white-space: nowrap !important;
    }

    /* Optimize eclipse mode workspace for mobile view */
    #workspaceEclipse {
        display: grid;
        grid-template-columns: 1fr !important;
        gap: 12px !important;
        padding: 8px !important;
    }
    #workspaceEclipse .panel {
        display: contents !important;
    }
    
    /* Reorder elements using Grid in workspaceEclipse */
    #workspaceEclipse .space-panel .canvas-container {
        grid-column: 1 !important;
        grid-row: 2 !important;
        width: 100% !important;
        max-width: 380px !important;
        aspect-ratio: 1 !important;
        margin: 0 auto !important;
        background: var(--panel-bg) !important;
        border: 1px solid var(--panel-border) !important;
        border-radius: 12px !important;
        padding: 12px !important;
        box-sizing: border-box !important;
        position: relative !important;
    }
    
    #workspaceEclipse .control-panel .phase-display-card {
        grid-column: 1 !important;
        grid-row: 3 !important;
        width: 100% !important;
        max-width: 380px !important;
        margin: 0 auto !important;
        padding: 10px !important;
        box-sizing: border-box !important;
        background: var(--panel-bg) !important;
        border: 1px solid var(--panel-border) !important;
        border-radius: 12px !important;
        display: block !important;
        text-align: center !important;
    }
    
    #workspaceEclipse .eclipse-render-container {
        display: inline-block !important;
        vertical-align: middle !important;
        width: 100px !important;
        height: 100px !important;
        margin: 0 !important;
    }
    #workspaceEclipse #eclipseRenderCanvas {
        width: 100px !important;
        height: 100px !important;
    }
    
    #workspaceEclipse .control-panel .phase-display-card .phase-info {
        margin-top: 0px !important;
        padding-top: 6px !important;
        font-size: 0.72rem !important;
        text-align: center !important;
        border-top: 1px dashed rgba(255, 255, 255, 0.1) !important;
        width: 100% !important;
        display: block !important;
    }
    #workspaceEclipse .control-panel .phase-display-card .phase-info h3 {
        font-size: 0.78rem !important;
        margin-top: 0px !important;
        margin-bottom: 2px !important;
    }
    #workspaceEclipse .control-panel .phase-display-card .phase-description {
        display: block !important;
        margin: 0 !important;
        line-height: 1.35 !important;
    }
    
    #workspaceEclipse .space-panel .space-controls {
        display: contents !important;
    }
    
    /* Moon Slider (Row 4) */
    #workspaceEclipse .space-panel .space-controls > .control-group:first-child {
        grid-column: 1 !important;
        grid-row: 4 !important;
        background: var(--panel-bg) !important;
        border: 1px solid var(--panel-border) !important;
        border-radius: 12px !important;
        padding: 12px !important;
        display: flex !important;
        flex-direction: column !important;
    }
    
    /* Node Slider (Row 5) */
    #workspaceEclipse .space-panel .space-controls > .control-group:last-child {
        grid-column: 1 !important;
        grid-row: 5 !important;
        background: var(--panel-bg) !important;
        border: 1px solid var(--panel-border) !important;
        border-radius: 12px !important;
        padding: 12px !important;
        display: flex !important;
        flex-direction: column !important;
        margin-top: 0px !important;
    }
    
    /* Exam Card (Row 6) */
    #workspaceEclipse .control-panel .exam-card {
        grid-column: 1 !important;
        grid-row: 6 !important;
        margin-top: 4px !important;
    }

    /* Optimize tide mode workspace for mobile view */
    #workspaceTide {
        display: grid;
        grid-template-columns: 1fr !important;
        gap: 12px !important;
        padding: 8px !important;
    }
    #workspaceTide .panel {
        display: contents !important;
    }
    
    /* Reorder elements using Grid in workspaceTide */
    #workspaceTide .space-panel .canvas-container {
        grid-column: 1 !important;
        grid-row: 2 !important;
        width: 100% !important;
        max-width: 380px !important;
        aspect-ratio: 1 !important;
        margin: 0 auto !important;
        background: var(--panel-bg) !important;
        border: 1px solid var(--panel-border) !important;
        border-radius: 12px !important;
        padding: 12px !important;
        box-sizing: border-box !important;
        position: relative !important;
    }
    
    #workspaceTide .control-panel .phase-display-card {
        grid-column: 1 !important;
        grid-row: 3 !important;
        width: 100% !important;
        max-width: 380px !important;
        margin: 0 auto !important;
        padding: 10px !important;
        box-sizing: border-box !important;
        background: var(--panel-bg) !important;
        border: 1px solid var(--panel-border) !important;
        border-radius: 12px !important;
        display: block !important;
    }

    #workspaceTide .control-panel .phase-display-card > div:first-child {
        display: flex !important;
        align-items: center !important;
        gap: 12px !important;
        margin-bottom: 8px !important;
        border-bottom: 1px dashed rgba(255, 255, 255, 0.1) !important;
        padding-bottom: 8px !important;
    }

    #workspaceTide .tide-gauge-container {
        flex-shrink: 0 !important;
        width: 40px !important;
        height: 70px !important;
    }

    #workspaceTide .control-panel .phase-display-card .phase-info {
        font-size: 0.72rem !important;
        text-align: left !important;
        border: none !important;
        padding-top: 0 !important;
        margin-top: 0 !important;
        display: block !important;
    }
    
    #workspaceTide .control-panel .phase-display-card .phase-info h3 {
        font-size: 0.82rem !important;
        margin-top: 2px !important;
        margin-bottom: 2px !important;
    }

    #workspaceTide .control-panel .phase-display-card .phase-description {
        display: block !important;
        margin: 0 !important;
        line-height: 1.3 !important;
        font-size: 0.72rem !important;
    }
    
    #workspaceTide .space-panel .space-controls {
        display: contents !important;
    }
    
    /* Time Slider (Row 4) */
    #workspaceTide .space-panel .space-controls > .control-group:first-child {
        grid-column: 1 !important;
        grid-row: 4 !important;
        background: var(--panel-bg) !important;
        border: 1px solid var(--panel-border) !important;
        border-radius: 12px !important;
        padding: 12px !important;
        display: flex !important;
        flex-direction: column !important;
    }
    
    /* Moon Slider (Row 5) */
    #workspaceTide .space-panel .space-controls > .control-group:last-child {
        grid-column: 1 !important;
        grid-row: 5 !important;
        background: var(--panel-bg) !important;
        border: 1px solid var(--panel-border) !important;
        border-radius: 12px !important;
        padding: 12px !important;
        display: flex !important;
        flex-direction: column !important;
        margin-top: 0px !important;
    }
    
    /* Exam Card (Row 6) */
    #workspaceTide .control-panel .exam-card {
        grid-column: 1 !important;
        grid-row: 6 !important;
        margin-top: 4px !important;
    }
}

/* Enable vertical scrolling when screen height is too small to fit the layout comfortably */
@media (max-height: 800px) {
    body {
        overflow: auto !important;
        height: auto !important;
    }
    .container {
        height: auto !important;
        overflow: visible !important;
    }
}