:root {
    --bg-dark: #070B19;
    --text-primary: #E2E8F0;
    --text-secondary: #94A3B8;
    --accent: #E2C08D; /* Venus-like golden accent */
    --accent-glow: rgba(226, 192, 141, 0.4);
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --highlight: #3B82F6;
    --font-heading: 'Space Grotesk', sans-serif;
    --font-body: 'Outfit', sans-serif;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-body);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    line-height: 1.6;
}

/* Starfield Background */
.star-field {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background-image: 
        radial-gradient(1px 1px at 20px 30px, #ffffff, rgba(0,0,0,0)),
        radial-gradient(1px 1px at 40px 70px, #ffffff, rgba(0,0,0,0)),
        radial-gradient(1px 1px at 50px 160px, #ffffff, rgba(0,0,0,0)),
        radial-gradient(1px 1px at 90px 40px, #ffffff, rgba(0,0,0,0)),
        radial-gradient(1.5px 1.5px at 130px 80px, #ffffff, rgba(0,0,0,0)),
        radial-gradient(2px 2px at 160px 120px, #e2c08d, rgba(0,0,0,0));
    background-repeat: repeat;
    background-size: 200px 200px;
    opacity: 0.6;
    animation: slowDrift 100s linear infinite;
}

@keyframes slowDrift {
    from { transform: translateY(0); }
    to { transform: translateY(-200px); }
}

.app-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
    position: relative;
}

.lang-switch {
    position: absolute;
    top: 0.8rem;
    right: 0.8rem;
    display: flex;
    gap: 0.4rem;
    z-index: 20;
}

.lang-btn {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    border-radius: 6px;
    padding: 0.2rem 0.55rem;
    font-family: var(--font-body);
    font-size: 0.8rem;
    cursor: pointer;
}

.lang-btn.active {
    border-color: var(--accent);
    color: var(--accent);
}

/* Header */
header {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 3rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--glass-border);
}

header h1 {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #fff, var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.top-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.5rem;
    z-index: 10;
}

.btn-primary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    font-family: var(--font-body);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.btn-primary:hover {
    background: var(--glass-bg);
    border-color: var(--accent);
    box-shadow: 0 0 15px var(--accent-glow);
}

/* Glass Panels */
.glass-panel {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 16px;
    padding: 1.5rem;
}

/* Hero Section */
.hero-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
    align-items: center;
}

.venus-visual-container {
    position: relative;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.canvas-wrapper {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    flex: 1;
}

.canvases-container {
    position: relative;
    width: 100%;
    max-width: 400px;
    aspect-ratio: 1;
}

.canvases-container canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.nav-side {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.nav-control {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.nav-label {
    font-size: 0.65rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-btn {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    width: 45px;
    height: 45px;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    backdrop-filter: blur(5px);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent);
    transform: scale(1.1);
    box-shadow: 0 0 10px var(--accent-glow);
}

#venus-canvas, #orbit-canvas {
    filter: drop-shadow(0 0 40px var(--accent-glow));
    transition: filter 0.5s ease;
}

.date-overlay {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 700;
    text-shadow: 0 2px 10px rgba(0,0,0,0.8);
    margin-top: -10px;
    z-index: 2;
}

.visibility-overlay {
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 400;
    color: var(--accent);
    text-shadow: 0 1px 5px rgba(0,0,0,0.8);
    margin-top: -5px;
    z-index: 2;
}

.playback-controls {
    display: flex;
    gap: 0.5rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    z-index: 10;
    margin-top: 10px;
}

.play-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    transition: transform 0.2s, color 0.2s;
}

.play-btn:hover {
    color: var(--accent);
    transform: scale(1.2);
}

.data-panel h2 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--accent);
}

.data-panel ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.data-panel li {
    display: flex;
    flex-direction: column;
    padding-bottom: 0.4rem;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.data-panel li:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.data-label {
    display: block;
    color: var(--text-secondary);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.1rem;
}

.data-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.upcoming-event {
    color: #F87171; /* Soft red/coral for events */
    font-weight: 700;
}

.event-controller {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.event-nav-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    transition: color 0.2s, transform 0.2s;
    display: flex;
    align-items: center;
}

.event-nav-btn:hover {
    color: var(--accent);
    transform: scale(1.2);
}

/* Calendar Section */
.calendar-section details summary {
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    list-style: none; /* Hide default arrow */
    outline: none;
}

.calendar-section details summary::-webkit-details-marker {
    display: none;
}

.calendar-section h2 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: rgba(226, 192, 141, 0.85); /* Faint gold */
    text-shadow: 0 0 8px rgba(226, 192, 141, 0.3); /* Subtle venus glow */
}

.toggle-icon {
    transition: transform 0.3s ease;
    font-size: 1.2rem;
}

details[open] .toggle-icon {
    transform: rotate(180deg);
}

.calendar-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 2rem 0 1rem;
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    transition: color 0.2s;
}

.btn-icon:hover {
    color: var(--accent);
}

#calendar-month-year {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    gap: 0.2rem;
}

.year-picker-container, .month-picker-container {
    position: relative;
    display: inline-flex;
    align-items: center;
}

.year-select-text, .month-select-text {
    cursor: pointer;
    border-bottom: 2px dashed rgba(255,255,255,0.2);
    transition: all 0.2s;
    padding: 0 0.2rem;
    text-align: center;
}

.year-select-text {
    min-width: 4rem;
}

.month-select-text {
    min-width: 2.2rem;
}

.year-select-text:hover, .month-select-text:hover {
    border-bottom-color: var(--accent);
    color: var(--accent);
}

.year-dropdown-list, .month-dropdown-list {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(7, 11, 25, 0.95);
    border: 1px solid var(--accent);
    border-radius: 8px;
    z-index: 100;
    box-shadow: 0 10px 25px rgba(0,0,0,0.8);
    backdrop-filter: blur(10px);
    overflow-y: auto; 
    padding: 0.5rem 0;
}

.year-dropdown-list {
    width: 90px;
    max-height: 200px; /* ~7 items */
}

.month-dropdown-list {
    width: 60px;
    max-height: 180px; /* ~6 items */
}

/* Custom Scrollbar */
.year-dropdown-list::-webkit-scrollbar, .month-dropdown-list::-webkit-scrollbar {
    width: 6px;
}

.year-dropdown-list::-webkit-scrollbar-track, .month-dropdown-list::-webkit-scrollbar-track {
    background: transparent;
}

.year-dropdown-list::-webkit-scrollbar-thumb, .month-dropdown-list::-webkit-scrollbar-thumb {
    background: rgba(226, 192, 141, 0.3);
    border-radius: 3px;
}

.year-dropdown-list::-webkit-scrollbar-thumb:hover, .month-dropdown-list::-webkit-scrollbar-thumb:hover {
    background: rgba(226, 192, 141, 0.6);
}

.year-dropdown-list.hidden, .month-dropdown-list.hidden {
    display: none;
}

.year-item, .month-item {
    padding: 0.3rem 0;
    text-align: center;
    font-size: 1.1rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.1s;
    font-family: var(--font-body);
}

.year-item:hover, .month-item:hover {
    color: white;
    background: rgba(255,255,255,0.1);
}

.year-item.active, .month-item.active {
    color: var(--accent);
    font-weight: bold;
    background: rgba(226, 192, 141, 0.1);
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, minmax(0, 1fr));
    gap: 8px;
}

.day-header {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 0.5rem 0;
    font-weight: 600;
}

.day-header.venus-day {
    color: rgba(226, 192, 141, 0.95);
    text-shadow: 0 0 8px rgba(226, 192, 141, 0.5);
    font-weight: 700;
}

#weekday-0.day-header {
    color: rgba(248, 113, 113, 0.95);
    text-shadow: 0 0 8px rgba(248, 113, 113, 0.45);
    font-weight: 700;
}

.calendar-days {
    display: contents; /* Allows children to participate in the parent's grid */
}

.cal-day {
    width: 100%;
    aspect-ratio: 1;
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: clamp(0.2rem, 0.7vw, 0.5rem);
    cursor: pointer;
    transition: all 0.2s ease;
    align-items: center;
    overflow: hidden;
}

.cal-day:hover {
    background: rgba(255,255,255,0.08);
    transform: scale(1.05);
    border-color: var(--accent);
}

.cal-day.empty {
    visibility: hidden;
}

.cal-day.selected {
    background: var(--glass-bg);
    border: 1px solid var(--accent);
    box-shadow: 0 0 10px var(--accent-glow);
}

.cal-day.today .day-number {
    background: var(--highlight);
    color: white;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.day-number {
    font-size: clamp(0.58rem, 1.15vw, 0.9rem);
    font-weight: 600;
    align-self: flex-start;
}

.cal-day.venus-friday .day-number {
    color: rgba(226, 192, 141, 0.95);
    text-shadow: 0 0 8px rgba(226, 192, 141, 0.5);
    font-weight: 700;
}

.cal-day.sun-day .day-number {
    color: rgba(248, 113, 113, 0.95);
    text-shadow: 0 0 8px rgba(248, 113, 113, 0.45);
    font-weight: 700;
}

.day-canvas-container {
    width: 48%;
    max-width: clamp(22px, 4.2vw, 42px);
    aspect-ratio: 1;
    margin-bottom: clamp(1px, 0.4vw, 4px);
    display: flex;
    align-items: center;
    justify-content: center;
}

.day-canvas-container canvas {
    max-width: 100%;
    max-height: 100%;
}

.cal-event {
    font-size: clamp(0.45rem, 0.95vw, 0.65rem);
    color: #E2C08D; /* matches accent */
    text-align: center;
    line-height: 1;
    margin-top: 2px;
    font-weight: 600;
    overflow-wrap: anywhere;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-section {
        grid-template-columns: 1fr;
        gap: 3rem; 
    }
    
    .venus-visual-container {
        margin-bottom: 20px;
    }
    
    header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .cal-day {
        padding: 0.2rem;
    }
    
    .day-canvas-container {
        width: 44%;
        max-width: 30px;
    }

    .lang-switch {
        top: 0.4rem;
        right: 0.4rem;
    }
}