:root {
    /* Futuristic Palette */
    --bg-dark: #050508;
    --bg-panel: rgba(20, 20, 35, 0.4);
    --primary-cyan: #00f3ff;
    --secondary-purple: #bc13fe;
    --text-main: #e0e0e0;
    --text-muted: #8a8a9b;
    --glass-border: rgba(255, 255, 255, 0.08);
    --neon-shadow: 0 0 10px rgba(0, 243, 255, 0.5);

    /* Spacing */
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;

    /* Font */
    --font-heading: 'Orbitron', sans-serif;
    --font-body: 'Outfit', sans-serif;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-body);
    height: 100vh;
    overflow: hidden;
    background-image:
        radial-gradient(circle at 10% 20%, rgba(188, 19, 254, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(0, 243, 255, 0.08) 0%, transparent 40%);
}

#app {
    display: flex;
    flex-direction: column;
    height: 100%;
}

/* Typography */
h1,
h2,
h3 {
    font-family: var(--font-heading);
    letter-spacing: 1px;
}

.glow-text {
    text-shadow: 0 0 8px rgba(0, 243, 255, 0.3);
}

.highlight {
    color: var(--primary-cyan);
}

/* Glassmorphism Utilities */
.glass-header {
    background: rgba(5, 5, 8, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--glass-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 10;
}

.glass-panel {
    background: var(--bg-panel);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: var(--spacing-lg);
    margin: var(--spacing-md);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.glass-nav {
    background: rgba(10, 10, 16, 0.8);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-top: 1px solid var(--glass-border);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-around;
    position: fixed;
    bottom: 0;
    width: 100%;
    padding-bottom: max(16px, env(safe-area-inset-bottom));
    /* Safe area for iOS */
}

/* Content Area */
#main-content {
    flex: 1;
    overflow-y: auto;
    padding-bottom: 80px;
    /* Space for nav */
}

/* Interactive Elements */
.nav-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    padding: 10px;
    border-radius: 50%;
    transition: all 0.3s ease;
    cursor: pointer;
}

.nav-btn.active {
    color: var(--primary-cyan);
    background: rgba(0, 243, 255, 0.1);
    box-shadow: 0 0 15px rgba(0, 243, 255, 0.2);
}

.nav-btn svg {
    display: block;
}

/* Animations */
@keyframes pulse-glow {
    0% {
        box-shadow: 0 0 5px rgba(0, 243, 255, 0.5);
    }

    50% {
        box-shadow: 0 0 20px rgba(0, 243, 255, 0.8);
    }

    100% {
        box-shadow: 0 0 5px rgba(0, 243, 255, 0.5);
    }
}

/* --- Water Tracker Module Styles --- */

.water-tracker-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
}

.circle-container {
    position: relative;
    width: 250px;
    height: 250px;
    border-radius: 50%;
    border: 4px solid var(--bg-panel);
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
    overflow: hidden;
    /* Clips the wave */
    background: rgba(0, 0, 0, 0.3);
}

.water-circle {
    width: 100%;
    height: 100%;
    position: relative;
}

/* Wave Animation */
.wave {
    position: absolute;
    top: 100%;
    /* Dynamic */
    left: -50%;
    width: 200%;
    height: 200%;
    background: rgba(0, 243, 255, 0.4);
    border-radius: 40%;
    animation: rotate 6s linear infinite;
    transition: top 1s ease-in-out;
}

.wave::before {
    content: "";
    position: absolute;
    top: 5px;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 243, 255, 0.3);
    /* Lighter top layer */
    border-radius: 40%;
    animation: rotate 10s linear infinite reverse;
}

@keyframes rotate {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

.circle-content {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 2;
    /* Above wave */
    pointer-events: none;
}

.water-percentage {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 700;
    color: #fff;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.water-label {
    font-size: 0.8rem;
    letter-spacing: 2px;
    color: rgba(255, 255, 255, 0.7);
    margin-top: -5px;
}

.stats-row {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    color: var(--primary-cyan);
}

/* Controls */
.controls-area {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
}

.bottle-selector {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.bottle-selector input {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--primary-cyan);
    color: var(--primary-cyan);
    padding: 10px;
    border-radius: 12px;
    font-family: var(--font-heading);
    width: 80px;
    text-align: center;
    font-size: 1.1rem;
    outline: none;
    box-shadow: 0 0 10px rgba(0, 243, 255, 0.1);
}

.bottle-selector input:focus {
    box-shadow: 0 0 15px rgba(0, 243, 255, 0.3);
}

.action-buttons {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-top: 10px;
}

.icon-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    color: var(--text-muted);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.icon-btn.secondary {
    border-color: rgba(255, 50, 50, 0.3);
    color: #ff4d4d;
}

.icon-btn:active {
    transform: scale(0.9);
}

.glow-btn {
    position: relative;
    background: rgba(0, 243, 255, 0.1);
    border: 1px solid var(--primary-cyan);
    color: var(--primary-cyan);
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
    padding: 0 40px;
    height: 60px;
    border-radius: 30px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 0 10px rgba(0, 243, 255, 0.2), inset 0 0 20px rgba(0, 243, 255, 0.1);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-transform: uppercase;
    letter-spacing: 2px;
    overflow: hidden;
}

.glow-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 243, 255, 0.4), transparent);
    transition: 0.5s;
}

.glow-btn:hover {
    background: rgba(0, 243, 255, 0.2);
    box-shadow: 0 0 30px rgba(0, 243, 255, 0.6);
    color: #fff;
    text-shadow: 0 0 8px rgba(0, 243, 255, 0.8);
}

.glow-btn:hover::before {
    left: 100%;
}

.glow-btn:active {
    transform: scale(0.98);
}

.glow-btn svg {
    filter: drop-shadow(0 0 2px rgba(255, 255, 255, 0.8));
}

/* --- Streak Module Styles --- */
.streak-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
    text-align: center;
}

.section-title {
    font-size: 1.2rem;
    color: var(--secondary-purple);
    letter-spacing: 4px;
    margin-bottom: 20px;
}

.streak-counter {
    background: radial-gradient(circle, rgba(188, 19, 254, 0.1) 0%, transparent 70%);
    padding: 40px;
    border-radius: 50%;
    margin-bottom: 20px;
}

.streak-days {
    font-family: var(--font-heading);
    font-size: 6rem;
    color: white;
    line-height: 1;
    text-shadow: 0 0 20px rgba(188, 19, 254, 0.6);
}

.streak-label {
    font-size: 1.5rem;
    color: var(--text-muted);
    letter-spacing: 5px;
}

.streak-detail {
    font-size: 1rem;
    color: var(--primary-cyan);
    margin-top: 10px;
}

.quote-card {
    background: rgba(255, 255, 255, 0.05);
    border-left: 3px solid var(--primary-cyan);
    padding: 20px;
    font-style: italic;
    color: #dedede;
    margin: 20px 0;
    line-height: 1.6;
    max-width: 300px;
}

.danger-btn {
    position: relative;
    background: rgba(255, 50, 50, 0.1);
    border: 1px solid #ff4d4d;
    color: #ff4d4d;
    font-family: var(--font-heading);
    padding: 15px 40px;
    border-radius: 30px;
    cursor: pointer;
    font-size: 1rem;
    letter-spacing: 2px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    margin-top: 30px;
    box-shadow: 0 0 10px rgba(255, 50, 50, 0.2), inset 0 0 20px rgba(255, 50, 50, 0.1);
    text-transform: uppercase;
    font-weight: 700;
}

.danger-btn:hover {
    background: rgba(255, 50, 50, 0.2);
    box-shadow: 0 0 30px rgba(255, 50, 50, 0.6);
    color: #fff;
    text-shadow: 0 0 8px rgba(255, 50, 50, 0.8);
    transform: translateY(-2px);
}

.danger-btn:active {
    transform: scale(0.95);
}

/* --- Connect Button (Neon Cyan Variant) --- */
.connect-glow-btn {
    position: relative;
    background: rgba(0, 243, 255, 0.1);
    border: 1px solid var(--primary-cyan);
    color: var(--primary-cyan);
    font-family: var(--font-heading);
    padding: 8px 24px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    letter-spacing: 1px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 0 10px rgba(0, 243, 255, 0.2), inset 0 0 10px rgba(0, 243, 255, 0.1);
    text-transform: uppercase;
    font-weight: 700;
}

.connect-glow-btn:hover {
    background: rgba(0, 243, 255, 0.2);
    box-shadow: 0 0 20px rgba(0, 243, 255, 0.6);
    color: #fff;
    text-shadow: 0 0 5px rgba(0, 243, 255, 0.8);
    transform: translateY(-1px);
}

.connect-glow-btn:active {
    transform: scale(0.95);
}

/* --- Concentric Rings --- */
.rings-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 20px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.02) 0%, transparent 70%);
    padding: 20px;
    border-radius: 50%;
}

.concentric-svg {
    width: 200px;
    height: 200px;
    transform: rotate(-90deg);
}

.ring-bg {
    fill: none;
    stroke: rgba(255, 255, 255, 0.05);
    /* Proper track color */
}

.ring-progress {
    fill: none;
    stroke-linecap: round;
    transition: stroke-dashoffset 1.5s ease-in-out;
}

.ring-progress.cyan {
    stroke: var(--primary-cyan);
    filter: drop-shadow(0 0 5px var(--primary-cyan));
}

.ring-progress.purple {
    stroke: var(--secondary-purple);
    filter: drop-shadow(0 0 5px var(--secondary-purple));
}

.rings-legend {
    display: flex;
    gap: 20px;
    margin-top: 15px;
}

.legend-item {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: 1px;
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.dot.cyan {
    background: var(--primary-cyan);
    box-shadow: 0 0 5px var(--primary-cyan);
}

.dot.purple {
    background: var(--secondary-purple);
    box-shadow: 0 0 5px var(--secondary-purple);
}

/* --- Combined Stat Card & Charts --- */
.stat-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    letter-spacing: 2px;
    margin-bottom: 5px;
    display: block;
}

.stat-value {
    font-family: var(--font-heading);
    font-size: 2rem;
    color: #fff;
    line-height: 1;
}

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

.icon-box {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.cyan-box {
    background: rgba(0, 243, 255, 0.1);
    color: var(--primary-cyan);
}

.purple-box {
    background: rgba(188, 19, 254, 0.1);
    color: var(--secondary-purple);
}

.chart-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
    margin: 20px 0;
}

/* Re-using chart styles but refining for the box */
.chart-container.small {
    height: 100px;
    margin-top: 0;
    border-bottom: none;
    padding-bottom: 0;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.chart-column {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

.chart-bar {
    width: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    transition: height 1s ease-out;
}

.chart-bar.cyan {
    background: var(--primary-cyan);
    box-shadow: 0 0 5px rgba(0, 243, 255, 0.3);
}

.chart-bar.purple {
    background: var(--secondary-purple);
    box-shadow: 0 0 5px rgba(188, 19, 254, 0.3);
}

.chart-day {
    margin-top: 8px;
    font-size: 0.6rem;
    color: var(--text-muted);
}