:root {
    --cosmic-deep: #0a0e27;
    --cosmic-medium: #1a1f3a;
    --cosmic-light: #2d3561;
    --star-white: #ffffff;
    --nebula-blue: #4da8ff;
    --nebula-purple: #9d7ff5;
    --nebula-pink: #ff6ec7;
    --meteor-gold: #ffd700;
    --success-green: #00ff88;
    --warning-red: #ff4757;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Space Mono', monospace;
    background: var(--cosmic-deep);
    color: var(--star-white);
    min-height: 100vh;
    position: relative;
    user-select: none;
    -webkit-user-select: none;
}

/* Starfield Animation */
.stars, .stars2, .stars3 {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.stars {
    background: transparent url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='400' height='400'%3E%3Ccircle cx='50' cy='50' r='1' fill='%23fff' opacity='0.8'/%3E%3Ccircle cx='150' cy='120' r='0.5' fill='%23fff' opacity='0.6'/%3E%3Ccircle cx='280' cy='80' r='1' fill='%23fff' opacity='0.9'/%3E%3Ccircle cx='350' cy='200' r='0.5' fill='%23fff' opacity='0.7'/%3E%3Ccircle cx='100' cy='300' r='1' fill='%23fff' opacity='0.8'/%3E%3Ccircle cx='250' cy='350' r='0.5' fill='%23fff' opacity='0.6'/%3E%3C/svg%3E") repeat;
    animation: stars-move 120s linear infinite;
}

.stars2 {
    background: transparent url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Ccircle cx='75' cy='75' r='0.5' fill='%23fff' opacity='0.5'/%3E%3Ccircle cx='175' cy='150' r='1' fill='%23fff' opacity='0.7'/%3E%3Ccircle cx='250' cy='100' r='0.5' fill='%23fff' opacity='0.6'/%3E%3Ccircle cx='120' cy='250' r='1' fill='%23fff' opacity='0.8'/%3E%3C/svg%3E") repeat;
    animation: stars-move 180s linear infinite;
}

.stars3 {
    background: transparent url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='500' height='500'%3E%3Ccircle cx='100' cy='100' r='1.5' fill='%234da8ff' opacity='0.4'/%3E%3Ccircle cx='300' cy='200' r='1' fill='%239d7ff5' opacity='0.5'/%3E%3Ccircle cx='450' cy='350' r='1.5' fill='%234da8ff' opacity='0.3'/%3E%3C/svg%3E") repeat;
    animation: stars-move 240s linear infinite;
}

@keyframes stars-move {
    from { transform: translateY(0); }
    to { transform: translateY(-400px); }
}

.container {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.screen {
    display: none;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 600px;
    animation: fadeIn 0.6s ease-out;
}

.screen.active {
    display: flex;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Celestial Logo */
.celestial-logo {
    width: 120px;
    height: 120px;
    margin-bottom: 30px;
    animation: celestial-pulse 3s ease-in-out infinite;
}

@keyframes celestial-pulse {
    0%, 100% { transform: scale(1); opacity: 0.9; }
    50% { transform: scale(1.05); opacity: 1; }
}

.celestial-logo svg {
    filter: drop-shadow(0 0 20px var(--nebula-blue));
}

/* Typography */
.title {
    font-family: 'Orbitron', sans-serif;
    font-size: 3.5rem;
    font-weight: 900;
    letter-spacing: 0.1em;
    text-align: center;
    margin-bottom: 15px;
    background: linear-gradient(135deg, var(--star-white), var(--nebula-blue), var(--nebula-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 30px rgba(77, 168, 255, 0.5);
}

.subtitle {
    font-size: 1rem;
    color: var(--nebula-blue);
    text-align: center;
    margin-bottom: 40px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.section-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 20px;
    color: var(--star-white);
}

.info-text, .instruction-text {
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-top: 15px;
    margin-bottom: 15px;
}

/* Buttons */
.primary-btn, .secondary-btn, .stop-btn {
    font-family: 'Orbitron', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    padding: 18px 40px;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    position: relative;
    overflow: hidden;
}

.primary-btn {
    background: linear-gradient(135deg, var(--nebula-blue), var(--nebula-purple));
    color: var(--star-white);
    box-shadow: 0 10px 30px rgba(77, 168, 255, 0.3);
}

.primary-btn.large {
    font-size: 1.2rem;
    padding: 24px 50px;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(77, 168, 255, 0.5);
}

.primary-btn:active {
    transform: translateY(0);
}

.secondary-btn {
    background: rgba(255, 255, 255, 0.1);
    color: var(--star-white);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.secondary-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.5);
}

.stop-btn {
    background: linear-gradient(135deg, #ff4757, #ff6348);
    color: var(--star-white);
    padding: 12px 30px;
    font-size: 0.9rem;
}

.btn-icon {
    font-size: 1.3em;
    vertical-align: middle;
}

/* Status Elements */
.status-badge {
    background: var(--success-green);
    color: var(--cosmic-deep);
    padding: 8px 20px;
    border-radius: 20px;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    margin-bottom: 20px;
    animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 20px rgba(0, 255, 136, 0.5); }
    50% { box-shadow: 0 0 30px rgba(0, 255, 136, 0.8); }
}

.location-info {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    margin-bottom: 30px;
}

/* Observing Screen */
.obs-header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 30px;
}

.session-info {
    flex: 1;
}

.timer {
    font-family: 'Orbitron', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--nebula-blue);
    text-shadow: 0 0 20px rgba(77, 168, 255, 0.6);
}

.session-start-time {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.5);
    margin-top: 5px;
}

.stats-panel {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    width: 100%;
    margin-bottom: 30px;
}

.stat-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 25px;
    text-align: center;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.stat-card.accent {
    background: linear-gradient(135deg, rgba(77, 168, 255, 0.1), rgba(157, 127, 245, 0.1));
    border-color: rgba(77, 168, 255, 0.3);
}

.stat-value {
    font-family: 'Orbitron', sans-serif;
    font-size: 3rem;
    font-weight: 900;
    color: var(--star-white);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.6);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Touch Area */
.touch-area {
    width: 100%;
    height: 60vh;
    min-height: 400px;
    background: rgba(0, 0, 0, 0.3);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 30px;
    position: relative;
    overflow: hidden;
    cursor: crosshair;
}

.touch-instructions {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: rgba(255, 255, 255, 0.4);
    font-size: 1rem;
    pointer-events: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.pulse-indicator {
    width: 20px;
    height: 20px;
    background: var(--nebula-blue);
    border-radius: 50%;
    animation: pulse-indicator 2s ease-in-out infinite;
}

@keyframes pulse-indicator {
    0%, 100% { transform: scale(1); opacity: 0.6; }
    50% { transform: scale(1.5); opacity: 1; }
}

#visual-feedback {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Results Screen */
#results-screen {
    max-width: 900px;
}

.results-summary {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 40px;
    backdrop-filter: blur(10px);
    text-align: center;
}

.charts-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    width: 100%;
    margin-bottom: 40px;
}

.chart-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 25px;
    backdrop-filter: blur(10px);
}

.chart-card h3 {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: var(--nebula-blue);
}

.chart-card canvas {
    width: 100%;
    max-width: 100%;
}

.action-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
}

/* Responsive */
@media (max-width: 768px) {
    .title {
        font-size: 2.5rem;
    }

    .stats-panel {
        grid-template-columns: 1fr;
    }

    .touch-area {
        height: 65vh;
        min-height: 350px;
    }

    .chart-card {
        padding: 20px;
    }
}

/* Fullscreen for observing */
#observing-screen.active {
    max-width: 100%;
    height: 100vh;
    justify-content: flex-start;
    padding-top: 20px;
    overflow: hidden;
}

#observing-screen.active .touch-area {
    flex: 1;
    max-height: none;
    margin-bottom: 20px;
}

/* Allow scrolling on results screen */
#results-screen.active {
    max-height: 100vh;
}

/* Allow scrolling on past sessions screen */
#past-sessions-screen.active {
    max-height: 100vh;
}

/* Prevent body scroll only during observing */
body:has(#observing-screen.active) {
    overflow: hidden;
}

/* Past Sessions List */
.sessions-list-container {
    width: 100%;
    max-width: 600px;
    max-height: calc(100vh - 250px);
    overflow-y: auto;
    overflow-x: hidden;
    margin-bottom: 20px;
    padding: 10px;
    scroll-behavior: smooth;
}

/* Custom scrollbar for sessions list */
.sessions-list-container::-webkit-scrollbar {
    width: 8px;
}

.sessions-list-container::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
}

.sessions-list-container::-webkit-scrollbar-thumb {
    background: var(--nebula-blue);
    border-radius: 4px;
    opacity: 0.6;
}

.sessions-list-container::-webkit-scrollbar-thumb:hover {
    background: var(--nebula-purple);
}

.sessions-list {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.session-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.session-card:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--nebula-blue);
    transform: translateX(5px);
}

.session-date {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.2rem;
    color: var(--nebula-blue);
    margin-bottom: 10px;
}

.session-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-top: 15px;
}

.session-stat {
    text-align: center;
}

.session-stat-value {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.5rem;
    color: var(--star-white);
}

.session-stat-label {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.5);
    text-transform: uppercase;
    margin-top: 5px;
}

.session-time {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 5px;
}

.session-location {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.4);
    font-style: italic;
}

.empty-sessions {
    text-align: center;
    padding: 60px 20px;
    color: rgba(255, 255, 255, 0.5);
}

.empty-sessions-icon {
    font-size: 4rem;
    margin-bottom: 20px;
    opacity: 0.3;
}

/* Version Indicator */
.version-indicator {
    position: fixed;
    bottom: 20px;
    right: 20px;
    font-family: 'Space Mono', monospace;
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.3);
    background: rgba(0, 0, 0, 0.3);
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    user-select: none;
    pointer-events: none;
    z-index: 9999;
}

@media (max-width: 768px) {
    .version-indicator {
        bottom: 10px;
        right: 10px;
        font-size: 0.7rem;
        padding: 6px 10px;
    }
}