:root {
    /* Dark Mode - Refined Aesthetic */
    --primary-color: #8B7EC8;
    /* Muted lavender */
    --secondary-color: #A091C7;
    /* Soft purple accent */
    --accent-color: #7EC8A3;
    /* Sage green */
    --background-color: #0F0F11;
    /* Deep charcoal */
    --card-background: #1A1A1F;
    /* Elevated dark cards */
    --text-color: #E8E8ED;
    /* Soft off-white */
    --text-muted: rgba(232, 232, 237, 0.6);
    /* Muted text */
    --input-background: rgba(255, 255, 255, 0.06);
    --input-border: rgba(255, 255, 255, 0.1);
    --border-color: rgba(255, 255, 255, 0.08);
    --primary-rgb: 139, 126, 200;
    --secondary-rgb: 160, 145, 199;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4), 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 12px 28px rgba(0, 0, 0, 0.5), 0 4px 8px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 8px 20px rgba(0, 0, 0, 0.4), 0 3px 6px rgba(0, 0, 0, 0.25);
    /* Motion tokens */
    --motion-fast: 160ms;
    --motion-normal: 220ms;
    --motion-slow: 280ms;
    --ease-standard: cubic-bezier(0.2, 0.8, 0.2, 1);
    --ease-emphasized: cubic-bezier(0.22, 0.61, 0.36, 1);
    --focus-ring: 0 0 0 3px rgba(var(--primary-rgb), 0.14);
}

body.light-mode {
    /* Light Mode - Refined Aesthetic */
    --primary-color: #6B5B95;
    /* Dusty purple */
    --secondary-color: #8E7CC3;
    /* Soft lavender */
    --accent-color: #5A9F7A;
    /* Muted teal */
    --background-color: #FAFAF9;
    /* Warm off-white */
    --card-background: #FFFFFF;
    /* Pure white cards */
    --text-color: #1A1A1F;
    /* Rich dark gray */
    --text-muted: rgba(26, 26, 31, 0.55);
    /* Muted dark text */
    --input-background: #F5F5F4;
    /* Subtle gray fill */
    --input-border: rgba(0, 0, 0, 0.06);
    --border-color: rgba(0, 0, 0, 0.06);
    --primary-rgb: 107, 91, 149;
    --secondary-rgb: 142, 124, 195;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06), 0 2px 4px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 12px 28px rgba(0, 0, 0, 0.1), 0 4px 8px rgba(0, 0, 0, 0.05);
    --shadow-hover: 0 8px 20px rgba(0, 0, 0, 0.1), 0 3px 6px rgba(0, 0, 0, 0.06);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    overflow-x: hidden;
    transition: background-color var(--motion-slow) var(--ease-standard), color var(--motion-slow) var(--ease-standard);
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.6;
}

:lang(ru) body,
:lang(ru) .title {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    width: 100%;
}

.title {
    font-family: 'Poppins', 'Inter', sans-serif;
    font-size: 2.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    text-align: center;
    margin-top: 1.65rem;
    margin-bottom: 0.6rem;
    color: var(--text-color);
    line-height: 1.2;
}

.description {
    font-size: 1.125rem;
    font-weight: 400;
    letter-spacing: 0;
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 2rem;
    max-width: 540px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.65;
}

@media (max-width: 720px) {
    .container {
        padding: 1.5rem 1rem;
    }

    .title {
        font-size: 2.25rem;
        margin-top: 1.1rem;
    }

    .description {
        font-size: 1.05rem;
        margin-bottom: 1.5rem;
    }
}

/* Add smooth scrollbar styling */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(var(--primary-rgb), 0.3);
    border-radius: 10px;
    transition: background var(--motion-fast) var(--ease-standard);
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(var(--primary-rgb), 0.5);
}

/* Selection color */
::selection {
    background: rgba(var(--primary-rgb), 0.3);
    color: var(--text-color);
}

::-moz-selection {
    background: rgba(var(--primary-rgb), 0.3);
    color: var(--text-color);
}
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
}

/* --- Page Navigation Stack --- */
#appPages {
    position: relative;
    width: 100%;
    height: 100dvh;
    overflow: hidden;
}

.page {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    transition: transform var(--motion-slow) var(--ease-emphasized), 
                opacity var(--motion-slow) var(--ease-standard);
    background: var(--background-color);
    will-change: auto;
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* Home Page States */
#homePage {
    transform: translateX(0);
    opacity: 1;
    pointer-events: auto;
    z-index: 1;
}

#homePage.hide-countdown .countdown-container {
    display: none;
}

#homePage.hide-countdown .description {
    margin-bottom: 1.5rem;
}

#homePage.hide-countdown #groupButtons {
    margin-top: 0.25rem;
}

#homePage.slid-out {
    transform: translateX(-12%);
    opacity: 0;
    pointer-events: none;
    z-index: 0;
}

/* Group Pages Default State */
.group-page {
    transform: translateX(104%);
    opacity: 0;
    pointer-events: none;
    z-index: 2;
}

html.scroll-locked,
body.scroll-locked {
    overflow: hidden !important;
    touch-action: none;
}

.group-page.active {
    transform: translateX(0);
    opacity: 1;
    pointer-events: auto;
}

.group-page.sliding-out {
    transform: translateX(100%);
    opacity: 0;
    pointer-events: none;
}

.form-content-container {
    padding-bottom: max(2.5rem, env(safe-area-inset-bottom));
}

.group-page.keyboard-open .form-content-container {
    padding-bottom: max(12rem, env(safe-area-inset-bottom));
}

/* Add subtle page background pattern for visual interest */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.03;
    z-index: 0;
    pointer-events: none;
    background-image: 
        radial-gradient(circle at 20% 30%, var(--primary-color) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, var(--secondary-color) 0%, transparent 50%);
}

body.light-mode::before {
    opacity: 0.02;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation: none !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}