/* Base & Variables */
:root {
    /* Color Palette */
    --color-bg-dark: #0f172a;       /* Deep slate/blue */
    --color-bg-darker: #020617;     /* Almost black */
    --color-bg-light: #f8fafc;      /* Off-white */
    --color-bg-white: #ffffff;      
    
    --color-text-dark: #94a3b8;     /* Light gray text on dark */
    --color-text-dark-heading: #f1f5f9; /* White text on dark */
    --color-text-light: #475569;    /* Dark gray text on light */
    --color-text-light-heading: #0f172a; /* Slate text on light */

    --color-accent: #3b82f6;        /* Bright Blue */
    --color-accent-hover: #2563eb;
    --color-highlight: #f59e0b;     /* Warm amber */
    
    /* Typography */
    --font-primary: 'Inter', sans-serif;
    
    /* Transitions */
    --transition-slow: 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: 0.3s ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

/* Reset & Setup */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative; /* Added so absolute ::before overlay expands with body content */
    transition: background-color var(--transition-slow), color var(--transition-slow);
}

/* Subtle Paper Grain Overlay */
body::before {
    content: "";
    position: absolute; /* absolute makes it scroll with the page */
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    /* Finer grain and perfectly tiled */
    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='1.5' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 250px 250px;
    opacity: 0.10;
    filter: grayscale(100%);
    transition: opacity var(--transition-slow);
}

body.light-mode::before {
    opacity: 0.375; /* increased opacity for light mode */
    mix-blend-mode: multiply; /* ensures dark grain shows up distinctly over white */
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Light/Dark Mode State Classes applied to Body */
body.dark-mode {
    background-color: var(--color-bg-dark);
    color: var(--color-text-dark);
}

body.light-mode {
    background-color: var(--color-bg-light);
    color: var(--color-text-light);
}

/* Typography styles that respond to body state */
h1, h2, h3, h4 {
    transition: color var(--transition-slow);
    line-height: 1.2;
}

body.dark-mode h1, 
body.dark-mode h2, 
body.dark-mode h3 {
    color: var(--color-text-dark-heading);
}

body.light-mode h1, 
body.light-mode h2, 
body.light-mode h3 {
    color: var(--color-text-light-heading);
}

.highlight {
    color: var(--color-accent);
}

/* Header */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    z-index: 100;
    transition: background-color var(--transition-fast), border-bottom var(--transition-fast);
}

body.light-mode .main-header {
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

body.dark-mode .main-header {
    background-color: rgba(15, 23, 42, 0.9); /* matching var(--color-bg-dark) */
    backdrop-filter: blur(8px);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 800;
    font-size: 1.25rem;
    letter-spacing: -0.025em;
}

.logo .icon {
    font-size: 1.5rem;
}

/* Buttons */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-accent);
    color: white;
    font-weight: 600;
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    transition: background-color 0.2s, transform 0.2s;
}

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-1px);
}

.btn-primary.small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* Play Badge */
.play-badge {
    height: 60px;
    width: auto;
    transition: transform 0.2s;
}

.play-badge:hover {
    transform: scale(1.05);
}

/* Hero Section (Interactive Area) */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-top: 4rem; /* offset for header */
}

.hero-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: 1200px;
    padding: 2rem;
    gap: 4rem;
}

@media (max-width: 900px) {
    .hero-container {
        flex-direction: column;
        text-align: center;
        gap: 2rem;
    }
}

.hero-text {
    flex: 1;
    z-index: 10;
    display: grid;
    align-items: center;
    text-align: center;
}

/* Force light and dark blocks to sit exactly on top of each other */
.hero-text > .light-content,
.hero-text > .interactive-prompt {
    grid-area: 1 / 1;
}

.headline {
    font-size: clamp(2.5rem, 4vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.025em;
    margin-bottom: 1rem;
}

.subtitle {
    font-size: clamp(1.125rem, 1.5vw, 1.25rem);
    margin-bottom: 2rem;
    opacity: 0.9;
}

.download-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    margin-bottom: 1rem;
}

.beta-notice {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-accent);
}

/* Visibility toggles based on light state */
.hidden-until-light,
.visible-in-dark {
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

body.dark-mode .hidden-until-light {
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
}

body.light-mode .hidden-until-light {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

body.dark-mode .visible-in-dark {
    opacity: 1;
    transform: translateY(0);
}

body.light-mode .visible-in-dark {
    opacity: 0;
    transform: translateY(-20px);
    pointer-events: none;
}

/* Interactive Prompt */
.interactive-prompt {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    z-index: 15;
}

.interactive-prompt h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text-dark-heading);
    margin-bottom: 0;
    white-space: nowrap;
}

.arrow-right {
    font-size: 2.5rem;
    color: var(--color-highlight);
    animation: bounceRight 2s infinite;
}

@keyframes bounceRight {
    0%, 20%, 50%, 80%, 100% { transform: translateX(0); }
    40% { transform: translateX(20px); }
    60% { transform: translateX(10px); }
}

.arrow-down {
    font-size: 2.5rem;
    color: var(--color-highlight);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-20px); }
    60% { transform: translateY(-10px); }
}

.visible-mobile {
    display: none;
}

@media (max-width: 900px) {
    .interactive-prompt {
        flex-direction: column;
        justify-content: center;
        text-align: center;
    }
    
    .interactive-prompt h2 {
        margin-bottom: 0.5rem;
    }

    .hidden-mobile {
        display: none;
    }

    .visible-mobile {
        display: block;
    }
}

/* Scroll Indicator */
.scroll-indicator {
    display: none; /* fallback */
    font-size: 2rem;
    color: var(--color-text-dark);
    text-decoration: none;
    z-index: 50;
    transition: color var(--transition-fast), opacity var(--transition-slow);
}

/* Make it fixed to viewport bottom so it's always visible when scrolling */
.scroll-indicator.fixed-arrow {
    display: block;
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0.7;
}

body.light-mode .scroll-indicator {
    color: var(--color-text-light);
}

.scroll-indicator:hover {
    color: var(--color-accent);
}

.scroll-arrow {
    display: inline-block;
    animation: scrollBounce 2s infinite ease-in-out;
}

@keyframes scrollBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(15px); }
}

/* Bathroom Scene Container */
.bathroom-scene {
    position: relative;
    flex: 1;
    width: 100%;
    max-width: 500px;
    aspect-ratio: 1 / 1;
    border-radius: 24px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: transform 0.3s ease;
    margin: 0 auto;
    cursor: pointer;
}

/* Images */
.scene-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    transition: opacity var(--transition-slow);
}

.dark-scene {
    background-image: url('assets/bathroom_dark.png');
    z-index: 1;
}

.bright-scene {
    background-image: url('assets/bathroom_light.png');
    z-index: 2;
    opacity: 0;
}

body.light-mode .bright-scene {
    opacity: 1;
}

/* Music Notes Animations */
.music-notes-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 5;
    opacity: 0;
    transition: opacity 0.5s;
}

body.light-mode .music-notes-container {
    opacity: 1;
}

.music-note {
    position: absolute;
    font-size: 2rem;
    color: var(--color-highlight);
    text-shadow: 0 0 10px rgba(245, 158, 11, 0.5);
    opacity: 0;
    /* initial position roughly near the phone in the illustration */
    bottom: 30%;
    left: 50%;
}

body.light-mode .music-note {
    animation: floatUp 3s infinite linear;
}

.n1 { animation-delay: 0.1s !important; left: 45%; color: #ef4444; }
.n2 { animation-delay: 1.2s !important; left: 55%; color: #3b82f6; font-size: 2.5rem; }
.n3 { animation-delay: 0.7s !important; left: 48%; color: #10b981; }
.n4 { animation-delay: 2.1s !important; left: 52%; color: #8b5cf6; font-size: 1.5rem; }

@keyframes floatUp {
    0% {
        transform: translate(0, 0) scale(0.5) rotate(-10deg);
        opacity: 0;
    }
    20% {
        opacity: 1;
    }
    80% {
        opacity: 0.8;
    }
    100% {
        transform: translate(calc(-50px + 100px * var(--rand, 0.5)), -200px) scale(1.5) rotate(20deg);
        opacity: 0;
    }
}

/* Shared Section Styles */
.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    font-weight: 800;
}

/* Light Section (How it works) */
.section-light {
    background-color: var(--color-bg-white);
    color: var(--color-text-light);
    padding: 6rem 0;
}

body.dark-mode .section-light {
    background-color: var(--color-bg-darker);
    color: var(--color-text-dark);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.step-card {
    text-align: center;
    padding: 2rem;
    background: var(--color-bg-light);
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s, box-shadow 0.3s, background-color var(--transition-slow);
}

body.dark-mode .step-card {
    background: var(--color-bg-dark);
    box-shadow: 0 4px 6px rgba(0,0,0,0.5);
}

.step-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.step-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: inline-block;
    background: #e0f2fe;
    width: 80px;
    height: 80px;
    line-height: 80px;
    border-radius: 50%;
}

body.dark-mode .step-icon {
    background: #1e3a8a;
}

.step-card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

/* Dark Section (Features) */
.section-dark {
    background-color: var(--color-bg-light);
    color: var(--color-text-light);
    padding: 6rem 0;
}

body.dark-mode .section-dark {
    background-color: var(--color-bg-dark);
    color: var(--color-text-dark);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    padding: 2rem;
    border: 1px solid rgba(0,0,0,0.05);
    border-radius: 16px;
    background: var(--color-bg-white);
    position: relative;
}

body.dark-mode .feature-card {
    background: var(--color-bg-darker);
    border-color: rgba(255,255,255,0.05);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* Tiers */
.tier-container {
    margin-bottom: 4rem;
    padding: 3rem 2rem;
    border-radius: 24px;
}

.premium-tier {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.05), rgba(245, 158, 11, 0.05));
    border: 2px solid rgba(245, 158, 11, 0.2);
}

body.dark-mode .premium-tier {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(245, 158, 11, 0.1));
    border: 2px solid rgba(245, 158, 11, 0.3);
}

.free-tier {
    background: transparent;
}

.tier-header {
    text-align: center;
    margin-bottom: 3rem;
}

.tier-header h2 {
    font-size: 2.5rem;
    color: var(--color-highlight);
    margin-bottom: 1rem;
    font-weight: 800;
}

.tier-header p {
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
}

.beta-promo-tier {
    margin-top: 1rem !important;
    padding: 0.5rem 1.5rem;
    background: rgba(245, 158, 11, 0.15);
    border: 1px dashed rgba(245, 158, 11, 0.5);
    border-radius: 99px;
    display: inline-block;
    color: var(--color-highlight);
    font-size: 0.95rem;
}

/* Repurpose Section */
.section-accent {
    background-color: var(--color-accent);
    color: white;
    padding: 5rem 0;
}

.section-accent.compact {
    padding: 2rem 0;
    margin-top: 0;
}

body.dark-mode .section-accent {
    background-color: #1e3a8a; /* Darker blue */
}

.container-narrow {
    max-width: 900px;
    margin: 0 auto;
}

.repurpose-content {
    display: flex;
    align-items: center;
    justify-content: center;
}

.repurpose-text {
    text-align: center;
}

.repurpose-text h2 {
    color: white !important;
    margin-bottom: 0.5rem;
    font-size: 1.75rem;
}

.repurpose-text p {
    font-size: 1.125rem;
    opacity: 0.9;
    max-width: 800px;
    margin: 0 auto;
}

.repurpose-text .asterisk {
    color: #fde047; /* Bright yellow */
    font-weight: 800;
}

.repurpose-text .disclaimer {
    margin-top: 1.5rem;
    font-size: 0.95rem;
    color: #fde047; /* Bright yellow */
    font-weight: 600;
    text-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

@media (max-width: 768px) {
    .repurpose-text h2 {
        font-size: 1.5rem;
    }
    .repurpose-text p {
        font-size: 1rem;
    }
}

/* Footer */
.main-footer {
    background-color: var(--color-bg-darker);
    color: var(--color-text-dark);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 2rem;
    margin-bottom: 3rem;
}

.footer-content .brand {
    max-width: 300px;
}

.footer-content .brand p {
    margin-top: 1rem;
    opacity: 0.8;
}

.download-section h3 {
    color: var(--color-text-dark-heading);
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.beta-notice-footer {
    margin-top: 1rem;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-accent);
}

.legal-disclaimer {
    font-size: 0.75rem;
    opacity: 0.5;
    margin-top: 1rem;
    max-width: 250px;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 0.875rem;
    opacity: 0.7;
}

/* Media Queries */
@media (max-width: 768px) {
    .main-header {
        padding: 1rem;
    }
    
    .headline {
        font-size: 2.5rem;
    }
    
    .interactive-prompt h2 {
        font-size: 1.5rem;
    }
    
    .light-switch {
        right: 5%;
        transform: scale(0.8);
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-content .brand {
        margin: 0 auto;
    }
    
    .download-section {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
}