:root {
    --primary-color: #667eea;
    --primary-hover: #5a67d8;
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --danger-color: #f56565;
    --danger-hover: #e53e3e;
    --success-color: #48bb78;
    --warning-color: #ed8936;
    --bg-color: #f7fafc;
    --surface-color: #ffffff;
    --text-color: #2d3748;
    --text-secondary: #718096;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
}

/* Dark mode support for Telegram */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1a202c;
        --surface-color: #2d3748;
        --text-color: #f7fafc;
        --text-secondary: #a0aec0;
        --border-color: #4a5568;
        --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.3), 0 1px 2px 0 rgba(0, 0, 0, 0.2);
        --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
        --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
        --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
    }
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow: hidden;
    height: 100vh;
    background-image:
        radial-gradient(at 40% 20%, rgba(102, 126, 234, 0.1) 0px, transparent 50%),
        radial-gradient(at 80% 80%, rgba(118, 75, 162, 0.1) 0px, transparent 50%);
}

.container {
    width: 100%;
    margin: 0 auto;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Ограничение ширины только для мобильных устройств */
@media (max-width: 768px) {
    .container {
        max-width: 600px;
    }
}

.screen {
    display: none;
    flex-direction: column;
    height: 100%;
    padding: 20px;
}

.screen.active {
    display: flex;
}

/* Home Screen */
#home-screen {
    justify-content: center;
    align-items: center;
    text-align: center;
}

.logo {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 24px;
    animation: fadeIn 0.5s ease-in;
    filter: drop-shadow(0 4px 6px rgba(102, 126, 234, 0.3));
}

.logo svg {
    width: 80px;
    height: 80px;
}

@media (min-width: 1024px) {
    .logo svg {
        width: 100px;
        height: 100px;
    }
}

h1 {
    font-size: 36px;
    margin-bottom: 12px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

@media (min-width: 1024px) {
    h1 {
        font-size: 48px;
    }
}

.subtitle {
    color: var(--text-secondary);
    font-size: 17px;
    margin-bottom: 48px;
    font-weight: 400;
}

@media (min-width: 1024px) {
    .subtitle {
        font-size: 20px;
    }
}

.button-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 100%;
    max-width: 400px;
}

@media (min-width: 769px) {
    .button-group {
        flex-direction: row;
        max-width: 600px;
    }

    .button-group .btn {
        flex: 1;
    }
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 32px;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    outline: none;
    -webkit-tap-highlight-color: transparent;
    position: relative;
    overflow: hidden;
    width: 100%;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background-color: var(--surface-color);
    color: var(--text-color);
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary:active {
    transform: translateY(0);
}

.input-container {
    margin-top: 20px;
    width: 100%;
    max-width: 400px;
    animation: slideDown 0.3s ease;
}

@media (min-width: 769px) {
    .input-container {
        max-width: 600px;
    }
}

.input-container.hidden {
    display: none;
}

.input-container input {
    width: 100%;
    padding: 16px 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 16px;
    margin-bottom: 16px;
    background-color: var(--surface-color);
    color: var(--text-color);
    outline: none;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.input-container input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    transform: translateY(-1px);
}

/* Call Screen */
#call-screen {
    padding: 0;
}

.call-info {
    padding: 20px;
    background: var(--surface-color);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    position: relative;
    z-index: 50;
}

@media (min-width: 1024px) {
    .call-info {
        padding: 24px 32px;
    }
}

.room-id-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 8px;
}

.room-id-display span {
    font-family: 'Courier New', monospace;
    font-size: 18px;
    font-weight: 600;
    color: var(--primary-color);
}

@media (min-width: 1024px) {
    .room-id-display span {
        font-size: 22px;
    }
}

.icon-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    -webkit-tap-highlight-color: transparent;
}

.icon-btn:hover,
.icon-btn:active {
    background-color: var(--border-color);
    color: var(--text-color);
}

.icon-btn.active {
    background-color: var(--primary-color);
    color: white;
}

.status-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.connection-status {
    text-align: center;
    font-size: 14px;
    color: var(--text-secondary);
}

.connection-status.connected {
    color: var(--success-color);
}

.encryption-indicator {
    display: flex;
    align-items: center;
    gap: 6px;
    background: linear-gradient(135deg, var(--success-color), #38a169);
    color: white;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
    animation: fadeIn 0.3s ease;
}

.encryption-indicator.hidden {
    display: none;
}

.encryption-indicator svg {
    width: 14px;
    height: 14px;
}

/* Layout Selector */
.layout-selector {
    position: absolute;
    top: 60px;
    right: 20px;
    background: var(--surface-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    padding: 8px;
    z-index: 200;
    min-width: 180px;
    animation: slideDown 0.2s ease;
    border: 1px solid var(--border-color);
}

.layout-selector.hidden {
    display: none;
}

.layout-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    color: var(--text-color);
}

.layout-option:hover {
    background-color: var(--bg-color);
}

.layout-option.selected {
    background: var(--primary-gradient);
    color: white;
}

.layout-option svg {
    flex-shrink: 0;
}

.layout-option span {
    font-size: 15px;
    font-weight: 500;
}

.videos-container {
    flex: 1;
    position: relative;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    overflow: hidden;
    display: grid;
    gap: 8px;
    padding: 8px;
}

/* Dynamic grid layouts for different participant counts */
/* GRID MODE - all participants equal size */
.videos-container[data-layout="grid"][data-participants="1"] {
    grid-template-columns: 1fr;
}

.videos-container[data-layout="grid"][data-participants="2"] {
    grid-template-columns: 1fr 1fr;
}

.videos-container[data-layout="grid"][data-participants="3"],
.videos-container[data-layout="grid"][data-participants="4"] {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
}

.videos-container[data-layout="grid"][data-participants="5"] {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr 1fr;
}

.videos-container[data-layout="grid"][data-participants="6"] {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr 1fr;
}

/* Улучшенная сетка для больших экранов */
@media (min-width: 1024px) {
    .videos-container[data-layout="grid"][data-participants="3"],
    .videos-container[data-layout="grid"][data-participants="4"] {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: 1fr 1fr;
    }

    .videos-container[data-layout="grid"][data-participants="5"],
    .videos-container[data-layout="grid"][data-participants="6"] {
        grid-template-columns: 1fr 1fr 1fr;
        grid-template-rows: 1fr 1fr;
    }
}

/* Очень широкие экраны */
@media (min-width: 1440px) {
    .videos-container[data-layout="grid"][data-participants="4"] {
        grid-template-columns: repeat(4, 1fr);
        grid-template-rows: 1fr;
    }

    .videos-container[data-layout="grid"][data-participants="5"],
    .videos-container[data-layout="grid"][data-participants="6"] {
        grid-template-columns: repeat(3, 1fr);
        grid-template-rows: 1fr 1fr;
    }
}

/* SPOTLIGHT MODE - one large, others small at bottom */
.videos-container[data-layout="spotlight"] {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    grid-template-rows: 1fr auto;
    gap: 12px;
}

.videos-container[data-layout="spotlight"] .video-wrapper:first-child {
    grid-column: 1 / -1;
    grid-row: 1;
}

.videos-container[data-layout="spotlight"] .video-wrapper:not(:first-child) {
    grid-row: 2;
    max-height: 140px;
}

@media (min-width: 1024px) {
    .videos-container[data-layout="spotlight"] .video-wrapper:not(:first-child) {
        max-height: 180px;
    }
}

/* SIDEBAR MODE - main video on left, others on right sidebar */
.videos-container[data-layout="sidebar"] {
    grid-template-columns: 1fr 180px;
    grid-template-rows: repeat(auto-fill, minmax(120px, 1fr));
    gap: 12px;
}

.videos-container[data-layout="sidebar"] .video-wrapper:first-child {
    grid-column: 1;
    grid-row: 1 / -1;
}

.videos-container[data-layout="sidebar"] .video-wrapper:not(:first-child) {
    grid-column: 2;
}

@media (min-width: 1024px) {
    .videos-container[data-layout="sidebar"] {
        grid-template-columns: 1fr 240px;
        grid-template-rows: repeat(auto-fill, minmax(160px, 1fr));
    }
}

@media (min-width: 1440px) {
    .videos-container[data-layout="sidebar"] {
        grid-template-columns: 1fr 300px;
        grid-template-rows: repeat(auto-fill, minmax(200px, 1fr));
    }
}

.video-wrapper {
    position: relative;
    background-color: #1a1a1a;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.video-wrapper:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
    z-index: 10;
    position: relative;
}

.video-wrapper video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    background-color: #1a1a1a;
}

.video-wrapper.local-video {
    border: 2px solid var(--primary-color);
}

.video-label {
    position: absolute;
    bottom: 12px;
    left: 12px;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    color: white;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
}

.video-label.muted::after {
    content: '🔇';
    font-size: 12px;
}

/* Fallback for old single video display */
#remote-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    background-color: #1a1a1a;
    display: none;
}

#local-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    background-color: #1a1a1a;
    display: none;
}

.controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    padding: 28px;
    background: var(--surface-color);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
}

@media (min-width: 1024px) {
    .controls {
        gap: 32px;
        padding: 32px;
    }
}

.control-btn {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-full);
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background-color: var(--bg-color);
    color: var(--text-color);
    box-shadow: var(--shadow-md);
    -webkit-tap-highlight-color: transparent;
    position: relative;
}

@media (min-width: 1024px) {
    .control-btn {
        width: 72px;
        height: 72px;
    }

    .control-btn.end-call {
        width: 80px;
        height: 80px;
    }
}

.control-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.control-btn:active {
    transform: translateY(-1px) scale(0.98);
}

.control-btn.active {
    background: var(--primary-gradient);
    color: white;
}

.control-btn.end-call {
    background: linear-gradient(135deg, var(--danger-color) 0%, var(--danger-hover) 100%);
    color: white;
    width: 72px;
    height: 72px;
}

.control-btn.end-call:hover {
    transform: scale(1.05) translateY(-3px);
    box-shadow: 0 8px 20px rgba(245, 101, 101, 0.4);
}

.control-btn svg {
    display: block;
    width: 24px;
    height: 24px;
}

@media (min-width: 1024px) {
    .control-btn svg {
        width: 28px;
        height: 28px;
    }
}

.control-btn svg.hidden {
    display: none;
}

/* Toast notifications */
.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(0, 0, 0, 0.85);
    color: white;
    padding: 12px 24px;
    border-radius: 24px;
    font-size: 14px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 1000;
    max-width: 80%;
    text-align: center;
}

.toast.show {
    opacity: 1;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Mobile optimizations */
@media (max-width: 480px) {
    #local-video {
        width: 100px;
        height: 133px;
        bottom: 16px;
        right: 16px;
    }

    .controls {
        padding: 16px;
        gap: 12px;
    }

    .control-btn {
        width: 50px;
        height: 50px;
    }
}

/* Landscape mode */
@media (orientation: landscape) and (max-height: 500px) {
    #local-video {
        width: 80px;
        height: 107px;
        bottom: 12px;
        right: 12px;
    }

    .controls {
        padding: 12px;
    }
}

/* Reactions System */
.reactions-dropdown {
    position: absolute;
    bottom: 90px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--surface-color);
    border-radius: var(--radius-md);
    padding: 12px;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
    z-index: 1000;
    min-width: 280px;
    transition: all 0.2s ease;
}

.reactions-dropdown.hidden {
    display: none;
}

.reactions-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
}

.reaction-item {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    border: 2px solid var(--border-color);
    background: var(--surface-color);
    cursor: pointer;
    font-size: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    user-select: none;
    position: relative;
}

.reaction-item:hover {
    transform: scale(1.15);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    background: var(--bg-color);
}

.reaction-item:active {
    transform: scale(1.0);
}

.reaction-count {
    position: absolute;
    bottom: -4px;
    right: -4px;
    background: var(--primary-color);
    color: white;
    font-size: 9px;
    font-weight: bold;
    padding: 2px 4px;
    border-radius: 8px;
    min-width: 16px;
    text-align: center;
    line-height: 1;
}

/* Reactions overlay for flying emojis */
.reactions-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 90px;
    pointer-events: none;
    z-index: 999;
    overflow: hidden;
}

.flying-reaction {
    position: absolute;
    font-size: 40px;
    animation: flyUp 3s ease-out forwards;
    pointer-events: none;
    user-select: none;
}

@keyframes flyUp {
    0% {
        bottom: 0;
        opacity: 1;
        transform: translateX(0) scale(0.5) rotate(0deg);
    }
    10% {
        opacity: 1;
        transform: translateX(0) scale(1) rotate(5deg);
    }
    50% {
        opacity: 1;
        transform: translateX(var(--drift-x, 20px)) scale(1) rotate(var(--rotate, 10deg));
    }
    100% {
        bottom: 100%;
        opacity: 0;
        transform: translateX(var(--drift-x, 40px)) scale(0.8) rotate(var(--rotate, 20deg));
    }
}

/* Desktop adjustments for reactions */
@media (min-width: 1024px) {
    .reactions-dropdown {
        min-width: 320px;
    }

    .reaction-item {
        width: 56px;
        height: 56px;
        font-size: 32px;
    }
}

/* Mobile adjustments for reactions */
@media (max-width: 600px) {
    .reactions-dropdown {
        min-width: calc(100vw - 40px);
        max-width: calc(100vw - 40px);
    }

    .reaction-item {
        width: 44px;
        height: 44px;
        font-size: 24px;
    }
}

/* Volume Control System */
.video-wrapper {
    position: relative;
}

.volume-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 16px;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    z-index: 10;
    user-select: none;
}

.video-wrapper.show-controls .volume-btn {
    display: flex;
}

.volume-btn:hover {
    background: rgba(0, 0, 0, 0.8);
    transform: scale(1.1);
}

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

.volume-control {
    position: fixed;
    background: var(--surface-color);
    border-radius: var(--radius-md);
    padding: 12px 6px;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
    z-index: 1001;
    transition: opacity 0.2s ease;
    width: 50px;
    max-width: 50px;
}

.volume-control.hidden {
    display: none;
}

.volume-slider-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.volume-icon {
    font-size: 18px;
    user-select: none;
    margin-bottom: 2px;
}

.volume-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 180px;
    height: 12px;
    background: var(--border-color);
    outline: none;
    border-radius: 6px;
    cursor: pointer;
    transform: rotate(-90deg);
    transform-origin: center;
    margin: 80px 0;
}

.volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    background: white;
    border: 3px solid var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all 0.2s ease;
}

.volume-slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: var(--shadow-lg);
    background: var(--primary-color);
}

.volume-slider::-webkit-slider-thumb:active {
    transform: scale(1.0);
}

.volume-slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    background: white;
    border: 3px solid var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all 0.2s ease;
}

.volume-slider::-moz-range-thumb:hover {
    transform: scale(1.15);
    box-shadow: var(--shadow-lg);
    background: var(--primary-color);
}

.volume-slider::-moz-range-thumb:active {
    transform: scale(1.0);
}

.volume-slider::-moz-range-track {
    background: var(--border-color);
    border-radius: 6px;
}

.volume-value {
    font-size: 11px;
    font-weight: 700;
    color: var(--primary-color);
    text-align: center;
    margin-top: 2px;
}

/* Volume indicator badge */
.volume-badge {
    position: absolute;
    top: 8px;
    left: 8px;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
    color: white;
    font-size: 11px;
    font-weight: 600;
    padding: 4px 8px;
    border-radius: 12px;
    opacity: 0;
    transition: opacity 0.2s ease;
    pointer-events: none;
    z-index: 9;
}

.video-wrapper:hover .volume-badge.visible {
    opacity: 1;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: var(--shadow-sm);
}

.btn:disabled::before {
    display: none;
}