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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #0a0a0a;
    color: #fff;
    height: 100vh;
    overflow: hidden;
}

#app { height: 100vh; width: 100vw; }

.screen { display: none; width: 100%; height: 100%; }
.screen.active { display: flex; }

/* Connect Screen */
#connect-screen {
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
}

.connect-content {
    text-align: center;
    max-width: 500px;
    padding: 40px;
}

.logo-img {
    width: 80px;
    height: auto;
    margin-bottom: 16px;
    filter: drop-shadow(0 4px 16px rgba(249, 115, 22, 0.3));
}

.logo h1 { font-size: 32px; font-weight: 700; margin-bottom: 8px; }
.subtitle { color: #8892b0; font-size: 16px; margin-bottom: 40px; }

.qr-section {
    background: #fff;
    border-radius: 20px;
    padding: 24px;
    display: inline-block;
    margin-bottom: 24px;
}

#qr-canvas { display: block; margin: 0 auto; }

.status-text { color: #666; font-size: 14px; margin-top: 12px; }
.timer-text { color: #999; font-size: 12px; margin-top: 4px; }

.or-divider {
    color: #5a6078;
    font-size: 13px;
    margin: 16px 0;
    position: relative;
}

.session-form {
    display: flex;
    gap: 8px;
    max-width: 350px;
    margin: 0 auto;
}

.session-form input {
    flex: 1;
    padding: 12px 16px;
    border-radius: 12px;
    border: 1px solid #333;
    background: #1a1a2e;
    color: #fff;
    font-size: 14px;
    outline: none;
}

.session-form input:focus { border-color: #f97316; }

.session-form button {
    padding: 12px 24px;
    border-radius: 12px;
    border: none;
    background: linear-gradient(135deg, #f97316, #ef4444);
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    font-size: 14px;
}

.session-form button:hover { opacity: 0.9; }

/* Presentation Screen */
#presentation-screen {
    position: relative;
    background: #000;
}

/* Stop button — hidden in fullscreen */
#stop-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: none;
    border-radius: 8px;
    background: rgba(239, 68, 68, 0.85);
    color: #fff;
    font-size: 13px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    backdrop-filter: blur(8px);
    transition: background 0.2s, opacity 0.2s;
}

#stop-btn:hover {
    background: rgba(239, 68, 68, 1);
}

:fullscreen #stop-btn,
:-webkit-full-screen #stop-btn,
:-moz-full-screen #stop-btn {
    padding: 10px;
    border-radius: 50%;
    opacity: 0.4;
}

:fullscreen #stop-btn span,
:-webkit-full-screen #stop-btn span,
:-moz-full-screen #stop-btn span {
    display: none;
}

:fullscreen #stop-btn:hover,
:-webkit-full-screen #stop-btn:hover,
:-moz-full-screen #stop-btn:hover {
    opacity: 1;
}

#slide-container {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

#slide-container img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

#slide-container video {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

#slide-container iframe {
    width: 100%;
    height: 100%;
    border: none;
}

#slide-indicator {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0,0,0,0.6);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    color: #ccc;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

#presentation-screen:hover #slide-indicator,
#slide-indicator.visible { opacity: 1; }

/* Audio Player */
.audio-player {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    width: 100%;
    background: linear-gradient(135deg, #1a1a2e, #0f3460);
    padding: 40px;
}

.audio-title { font-size: 28px; font-weight: 600; margin-bottom: 32px; }

.waveform-container {
    width: 80%;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 3px;
    margin-bottom: 32px;
}

.waveform-bar {
    width: 4px;
    background: linear-gradient(to top, #f97316, #ef4444);
    border-radius: 2px;
    transition: height 0.1s ease;
}

.audio-progress {
    width: 60%;
    height: 4px;
    background: #333;
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 16px;
}

.audio-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #f97316, #ef4444);
    width: 0%;
    transition: width 0.3s;
}

.audio-time {
    color: #8892b0;
    font-size: 14px;
}

/* Welcome screen */
.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    background: linear-gradient(135deg, #1a1a2e, #16213e);
}

.welcome-screen h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
}

.welcome-screen p {
    color: #8892b0;
    font-size: 20px;
}

/* End Screen */
#end-screen {
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
}

.end-content {
    text-align: center;
    max-width: 700px;
    padding: 40px;
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.end-logo {
    width: 100px;
    height: auto;
    margin-bottom: 24px;
    filter: drop-shadow(0 6px 20px rgba(249, 115, 22, 0.4));
    animation: floatLogo 3s ease-in-out infinite;
}

@keyframes floatLogo {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.end-title {
    font-size: 36px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 12px;
    background: linear-gradient(135deg, #fff 0%, #e0e0e0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.end-subtitle {
    color: #8892b0;
    font-size: 18px;
    margin-bottom: 32px;
}

.store-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 40px;
}

.store-badge {
    display: inline-block;
    text-decoration: none;
    transition: transform 0.2s, opacity 0.2s;
}

.store-badge:hover {
    transform: scale(1.05);
    opacity: 0.9;
}

.store-svg {
    height: 44px;
    width: auto;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.2);
}

.end-qr-section {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-top: 8px;
}

.end-qr-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.end-qr-placeholder {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 24px rgba(0,0,0,0.3);
    transition: transform 0.2s;
}

.end-qr-placeholder:hover {
    transform: scale(1.05);
}

.end-qr-label {
    color: #8892b0;
    font-size: 14px;
    font-weight: 500;
}