@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap');

:root {
    --primary-color: #0c8277;
    --primary-light: #33a299;
    --primary-dark: #0a6a61;
    --background-color: #f0f4f8;
    --text-color: #333;
    --light-text-color: #667;
    --white: #fff;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.07);
    --shadow-hover: 0 7px 20px rgba(12, 130, 119, 0.3);
    --font-size-base: 1rem;
    --font-size-lg: clamp(1.1rem, 1vw + 0.9rem, 1.25rem);
    --font-size-xl: clamp(2rem, 4vw + 1rem, 3.5rem);
    --spacing-sm: clamp(0.5rem, 1vw + 0.25rem, 0.75rem);
    --spacing-md: clamp(1rem, 2vw + 0.5rem, 1.5rem);
    --spacing-lg: clamp(1.5rem, 3vw + 0.75rem, 2.5rem);
    --transition-speed: 0.8s;
    --transition-fast: 0.3s;
}

/* Base Styles */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    background-color: var(--background-color);
    color: var(--text-color);
    overflow-x: hidden;
    line-height: 1.6;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Layout */
.main-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    min-height: 100vh;
    padding: var(--spacing-lg);
    box-sizing: border-box;
    width: 100%;
}

@media (min-width: 992px) {
    .main-container {
        flex-direction: row;
        justify-content: space-around;
        gap: 5vw;
    }
}

/* About Section */
.about-section {
    text-align: center;
    max-width: 550px;
}

@media (min-width: 992px) {
    .about-section {
        text-align: left;
        margin-bottom: 0;
    }
}

.about-section h1 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    background: linear-gradient(45deg, var(--primary-color), var(--primary-light));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--spacing-md);
}

.about-section p {
    font-size: var(--font-size-lg);
    color: var(--light-text-color);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 1rem;
    align-items: center;
    justify-content: center;
}

@media (min-width: 992px) {
    .action-buttons {
        justify-content: flex-start;
    }
}

.btn {
    background: var(--primary-color);
    color: var(--white);
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: 8px;
    cursor: pointer;
    font-size: var(--font-size-base);
    font-weight: 600;
    transition: all var(--transition-fast) ease;
    box-shadow: 0 4px 15px rgba(12, 130, 119, 0.2);
    text-decoration: none;
    display: inline-block;
}

.btn:hover, .btn:focus {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
    background: var(--primary-dark);
}

.btn:focus {
    outline: 2px solid var(--primary-dark);
    outline-offset: 2px;
}

.btn-secondary {
    background: var(--white);
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.btn-secondary:hover, .btn-secondary:focus {
    background: var(--background-color);
    color: var(--primary-dark);
    border-color: var(--primary-dark);
}

#install-btn {
    display: none; /* Hidden by default */
}

/* Features List */
.features-list {
    list-style: none;
    padding: 0;
    margin-top: var(--spacing-lg);
    text-align: left;
}

.features-list li {
    position: relative;
    padding-left: 25px;
    margin-bottom: 10px;
}

.features-list li:before {
    content: '✓';
    color: var(--primary-color);
    position: absolute;
    left: 0;
    top: 2px;
    font-weight: 600;
}

/* Device Showcase */
.device-showcase {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
    perspective: 1500px; /* For 3D tilt */
    transition: max-width 0.5s cubic-bezier(0.25, 1, 0.5, 1);
    max-width: 375px; /* Default to mobile width */
}

.device-controls {
    margin-bottom: 0;
    text-align: center;
}

.device-controls button {
    background: var(--white);
    border: 1px solid #ddd;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    color: var(--light-text-color);
    transition: all var(--transition-fast) ease;
    font-size: 0.9rem;
}

.device-controls button.active {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

.device-container {
    position: relative;
    background: #1e1e1e;
    border: 1px solid #4a4a4a;
    border-radius: clamp(20px, 3vw, 40px);
    padding: clamp(8px, 1.5vw, 12px);
    box-shadow: var(--shadow);
    transform: none; /* Mobile-first: default is straight */
    transition: aspect-ratio 0.5s cubic-bezier(0.25, 1, 0.5, 1), transform 0.1s ease-out;
    width: 100%;
    max-height: 80vh; /* A direct, unambiguous height constraint */
    aspect-ratio: 9 / 19.5; /* Modern phone aspect ratio */
}

@media (min-width: 769px) {
    .device-container {
        transform: rotate(3deg); /* Apply tilt only on larger screens */
    }
}

.device-showcase.tablet-mode {
    max-width: 540px; /* Wider for tablet mode */
}

.device-container iframe {
    display: block;
    border-radius: clamp(15px, 2.5vw, 30px);
    border: none;
    width: 100%;
    height: 100%;
}

/* Scroll Animation Styles */
.animate-on-scroll {
    opacity: 0;
    transition: opacity var(--transition-speed) ease-out, transform var(--transition-speed) ease-out;
}

.about-section.animate-on-scroll {
    transform: translateY(30px);
}

@media (min-width: 992px) {
    .about-section.animate-on-scroll {
        transform: translateX(-50px);
    }
}

.device-showcase.animate-on-scroll {
    transform: translateY(30px);
}

@media (min-width: 992px) {
    .device-showcase.animate-on-scroll {
        transform: translateX(50px);
    }
}

.features-list li.animate-on-scroll {
    transform: translateX(-20px);
}

.is-visible {
    opacity: 1;
    transform: translate(0, 0) !important;
}

/* Full App Mode */
body.full-app-mode .about-section,
body.full-app-mode .device-controls {
    display: none;
}

body.full-app-mode .device-showcase {
    display: block;
    width: 100%;
    height: 100%;
    max-width: none;
    perspective: none;
    position: fixed;
    top: 0; left: 0;
    z-index: 9999;
}

body.full-app-mode .device-container {
    display: block;
    max-height: none;
    width: 100%;
    height: 100%;
    border-radius: 0;
    padding: 0;
    transform: none;
    border: none;
}

body.full-app-mode .device-container iframe {
    border-radius: 0;
}

/* Prefers reduced motion placeholder */

/* Prefers reduced motion */
@media (prefers-reduced-motion: reduce) {
    * {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
    }
}

.floating-install-btn {
    position: fixed;
    right: 2rem;
    bottom: 2.5rem;
    z-index: 10001;
    background: #0c8277;
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 56px;
    height: 56px;
    box-shadow: 0 4px 16px rgba(12,130,119,0.18);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.2s, box-shadow 0.2s, transform 0.1s;
    outline: none;
}
.floating-install-btn:hover, .floating-install-btn:focus {
    background: #0a6d62;
    box-shadow: 0 6px 20px rgba(12,130,119,0.28);
    transform: translateY(-2px) scale(1.05);
}
.floating-install-btn svg {
    display: block;
    margin: 0 auto;
}
@media (max-width: 600px) {
    .floating-install-btn {
        right: 1rem;
        bottom: 1.2rem;
        width: 48px;
        height: 48px;
    }
    .floating-install-btn svg {
        width: 22px;
        height: 22px;
    }
}
.install-modal-backdrop {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.35);
    z-index: 10010;
}
.install-modal-content {
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.18);
    padding: 2rem 1.5rem 1.5rem 1.5rem;
    z-index: 10011;
    min-width: 300px;
    max-width: 90vw;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}
.install-modal-content h2 {
    margin-top: 0;
    color: #0c8277;
    font-size: 1.3rem;
    font-weight: 600;
}
.install-modal-content ul {
    text-align: left;
    margin: 1rem 0 0 0;
    padding: 0 0 0 1.2em;
}
.install-modal-content li {
    margin-bottom: 0.5em;
    font-size: 1rem;
}
.install-modal-close {
    position: absolute;
    top: 0.7em;
    right: 1em;
    background: none;
    border: none;
    font-size: 1.5em;
    color: #888;
    cursor: pointer;
    z-index: 10012;
}
#install-modal {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: 10010;
    align-items: center;
    justify-content: center;
}