@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;700&display=swap');

/* Neumorphic "Glass-Neu Hybrid" Theme Tokens */
:root {
    /* Charcoal Neumorphic (Default Dark) */
    --bg-main: #1e1e24;
    --bg-material: radial-gradient(circle at 50% -20%, #2e2e36, #1e1e24);
    --neu-upper: -6px -6px 12px rgba(255, 255, 255, 0.05); /* Light highlight */
    --neu-lower: 6px 6px 12px rgba(0, 0, 0, 0.4); /* Dark shadow */
    --neu-inset-upper: inset -4px -4px 8px rgba(255, 255, 255, 0.03);
    --neu-inset-lower: inset 4px 4px 8px rgba(0, 0, 0, 0.5);
    
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    
    --accent-primary: #10b981; 
    --accent-secondary: #8b5cf6; 
    --text-main: #f8fafc;
    --text-muted: #64748b;
    --noise-opacity: 0.035;
    --grid-color: rgba(255, 255, 255, 0.05);
    --grid-opacity: 0.8;
    --spring-easing: cubic-bezier(0.43, 0.13, 0.23, 0.96);
}

[data-theme='light'] {
    /* "Pebble" Light Neumorphic Refresh */
    --bg-main: #ebecf0;
    --bg-material: radial-gradient(circle at 50% -20%, #ffffff, #ebecf0);
    --neu-upper: -6px -6px 14px #ffffff;
    --neu-lower: 6px 6px 14px #d1d9e6; /* Softer, less "heavy" shadow */
    --neu-inset-upper: inset -4px -4px 10px #ffffff;
    --neu-inset-lower: inset 4px 4px 10px #d1d9e6;
    
    --glass-bg: rgba(255, 255, 255, 0.4); /* Cleaner glass surfaces */
    --glass-border: rgba(0, 0, 0, 0.03); 
    
    --accent-primary: #10b981; /* Emerald */
    --accent-secondary: #f59e0b; /* Amber/Orange accent */
    --text-main: #2d3436; /* Softer Charcoal for readability */
    --text-muted: #636e72;
    --noise-opacity: 0.015;
    --grid-color: rgba(0, 0, 0, 0.1); /* Increased visibility in light mode */
    --grid-opacity: 0.8;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.4s var(--spring-easing), 
                color 0.4s var(--spring-easing), 
                box-shadow 0.4s var(--spring-easing),
                transform 0.4s var(--spring-easing);
}

html, body {
    overflow-x: hidden;
    max-width: 100%;
}

body {
    background: var(--bg-material);
    background-attachment: fixed;
    color: var(--text-main);
    font-family: 'Outfit', sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

/* Micro-Grain Overlay */
.noise-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 9999;
    opacity: var(--noise-opacity);
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

.bg-topology {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: -1;
    opacity: var(--grid-opacity);
    background-image: 
        radial-gradient(var(--grid-color) 1.5px, transparent 1.5px),
        linear-gradient(to right, var(--grid-color) 1px, transparent 1px),
        linear-gradient(to bottom, var(--grid-color) 1px, transparent 1px);
    background-size: 16px 16px, 64px 64px, 64px 64px;
    mask-image: radial-gradient(ellipse at center, black, transparent 90%);
}

/* Neumorphic Utilities */
.neu-convex {
    box-shadow: var(--neu-upper), var(--neu-lower);
}

.neu-inset {
    box-shadow: var(--neu-inset-upper), var(--neu-inset-lower);
}

/* HUD Controls (Hybrid Glass-Neu) */
.hud-controls {
    position: fixed;
    top: 2rem;
    right: 2rem;
    display: flex;
    gap: 1.5rem;
    z-index: 100;
}

@media (max-width: 600px) {
    .hud-controls {
        position: relative;
        top: 0;
        right: 0;
        margin: 1.5rem auto 0 auto;
        width: fit-content;
        justify-content: center;
    }
}

.theme-toggle, .sync-mode {
    background: var(--bg-main);
    border: none;
    border-radius: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--neu-upper), var(--neu-lower);
    color: var(--text-main);
    padding: 1rem;
    position: relative;
    overflow: hidden;
}

/* Glass Highlight on Neumorphic */
.theme-toggle::after, .sync-mode::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.05), transparent);
    pointer-events: none;
}

.sync-mode {
    padding: 1rem 1.5rem;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    gap: 0.75rem;
}

.sync-mode span {
    color: var(--accent-primary);
}

.sync-mode.disabled span {
    color: var(--text-muted);
}

.theme-toggle:hover, .sync-mode:hover {
    transform: translateY(-2px);
    box-shadow: var(--neu-upper), 8px 8px 16px rgba(0, 0, 0, 0.45);
}

[data-theme='light'] .theme-toggle:hover, [data-theme='light'] .sync-mode:hover {
    box-shadow: var(--neu-upper), 10px 10px 20px #babecc;
}

.theme-toggle:active, .sync-mode:active {
    transform: scale(0.96);
    box-shadow: var(--neu-inset-upper), var(--neu-inset-lower);
}

.container {
    width: 100%;
    max-width: 1100px; /* Wider for more white space */
    padding: 3rem 2rem;
    margin-top: 6rem;
}

header {
    text-align: center;
    margin-bottom: 7rem; /* Increased breathing room */
    animation: cinematicFadeInDown 1s var(--spring-easing);
}

h1 {
    font-size: 5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.06em;
    margin-bottom: 0.5rem;
    line-height: 0.9;
}

header p {
    color: var(--text-muted);
    font-size: 1.3rem;
    font-weight: 400;
    max-width: 500px;
    margin: 1.5rem auto;
    letter-spacing: -0.01em;
    opacity: 0.9;
}

/* Primary Calculator Card */
.calculator-card {
    background: var(--bg-main);
    box-shadow: var(--neu-upper), var(--neu-lower);
    border-radius: 3rem; /* Softer pebble shape */
    padding: 4rem 3rem; /* Generous internal padding */
    width: 100%;
    animation: cinematicScaleUp 0.8s var(--spring-easing);
}

/* Tabs: Punched-in Container */
.tabs-navigation {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 3rem;
    padding: 0.5rem;
    background: var(--bg-main);
    border-radius: 1.5rem;
    box-shadow: var(--neu-inset-upper), var(--neu-inset-lower);
}

.tab-btn {
    flex: 1 1 calc(50% - 0.5rem);
    background: transparent;
    border: none;
    padding: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
    font-family: 'Outfit', sans-serif;
    font-size: 0.75rem;
    cursor: pointer;
    border-radius: 1.25rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--text-main);
}

/* Active Tab: Convex Indicator */
.tab-btn.active {
    background: var(--bg-main);
    color: var(--accent-primary);
    box-shadow: var(--neu-upper), var(--neu-lower);
}

.tab-content {
    display: none;
    animation: cinematicSlideUp 0.5s var(--spring-easing);
}

.tab-content.active {
    display: block;
}

.input-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

@media (max-width: 600px) {
    .input-group {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

.field {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

label {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--accent-primary);
    padding-left: 0.5rem;
}

/* Inputs: Punched-in Feel */
input[type="date"] {
    background: var(--bg-main);
    border: none;
    border-radius: 1.5rem;
    padding: 1.5rem;
    color: var(--text-main);
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.25rem;
    outline: none;
    box-shadow: var(--neu-inset-upper), var(--neu-inset-lower);
    -webkit-appearance: none;
    appearance: none;
}

input[type="date"]:focus {
    box-shadow: var(--neu-inset-upper), inset 6px 6px 12px rgba(16, 185, 129, 0.1);
}

/* Primary "Punched-Out" Button */
.btn-primary {
    width: 100%;
    background: var(--bg-main);
    color: var(--accent-primary);
    border: none;
    padding: 1.8rem;
    border-radius: 2rem;
    font-size: 1.3rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow: var(--neu-upper), var(--neu-lower);
    letter-spacing: -0.02em;
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.05), transparent);
}

.btn-primary:active {
    transform: scale(0.98);
    box-shadow: var(--neu-inset-upper), var(--neu-inset-lower);
}

.results-container {
    margin-top: 4rem;
    display: none;
}

/* Main Counter: Prominent Convex Slab */
.live-counter {
    background: var(--bg-main);
    box-shadow: var(--neu-upper), var(--neu-lower);
    padding: 3rem 1.5rem;
    border-radius: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
}

.live-value {
    font-size: 5rem;
    font-weight: 800;
    font-family: 'JetBrains Mono', monospace;
    background: linear-gradient(to bottom, var(--text-main), var(--accent-primary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.05em;
    line-height: 1;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1.5rem;
}

@media (max-width: 600px) {
    .results-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
}

/* Metric Cards: Convex Octagons/Slabs */
.metric-card {
    background: var(--bg-main);
    box-shadow: var(--neu-upper), var(--neu-lower);
    padding: 2rem 1rem;
    border-radius: 2rem;
    text-align: center;
    opacity: 0;
    transform: scale(0.9) translateY(20px);
}

.metric-card.reveal {
    animation: cinematicNeuReveal 0.6s var(--spring-easing) forwards;
}

.metric-value {
    font-size: 3.2rem;
    font-weight: 800;
    font-family: 'JetBrains Mono', monospace;
    color: var(--accent-primary);
    line-height: 1.1;
    margin-bottom: 0.5rem;
}

@keyframes cinematicNeuReveal {
    to { opacity: 1; transform: scale(1) translateY(0); }
}

@keyframes cinematicFadeInDown {
    from { opacity: 0; transform: translateY(-40px); }
    to { opacity: 1; transform: translateY(0); }
}

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

@keyframes cinematicScaleUp {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

@media (max-width: 768px) {
    .hud-controls { 
        position: relative; 
        top: 0; 
        right: 0; 
        margin-bottom: 2rem; 
        width: 100%; 
        justify-content: center; 
    }
    
    .container {
        padding: 3rem 1.5rem;
        margin-top: 2rem;
    }
    
    .calculator-card {
        padding: 2.5rem 1.75rem;
        border-radius: 2.5rem;
    }

    h1 {
        font-size: 3.5rem;
    }

    .live-value {
        font-size: 4rem;
    }
}

@media (max-width: 600px) {
    .container {
        padding: 2rem 1rem;
    }
    
    .calculator-card {
        padding: 2.25rem 1.25rem;
        border-radius: 2rem;
    }

    h1 {
        font-size: 3rem;
    }

    .live-value {
        font-size: 3.2rem;
    }

    .metric-value {
        font-size: 2.2rem;
    }

    .tab-btn {
        font-size: 0.6rem;
    }

    .results-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }
}