:root {
    --bg-primary: #020617;
    --bg-secondary: rgba(15, 23, 42, 0.65);
    --border-color: rgba(255, 255, 255, 0.08);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #6366f1;
    --accent-glow: rgba(99, 102, 241, 0.25);
    --success: #10b981;
    --error: #ef4444;
    --danmaku-font-size: 32px;
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Outfit', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
    position: relative;
}

/* Beautiful space radial glows */
.bg-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    z-index: 0;
    pointer-events: none;
    opacity: 0.4;
}

.bg-glow-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.3) 0%, rgba(99, 102, 241, 0) 70%);
    top: -200px;
    right: -100px;
}

.bg-glow-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(236, 72, 153, 0.2) 0%, rgba(236, 72, 153, 0) 70%);
    bottom: -150px;
    left: -100px;
}

/* Subtle pattern overlay */
.grid-overlay {
    position: absolute;
    inset: 0;
    background-image: radial-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 24px 24px;
    z-index: 1;
    pointer-events: none;
}

/* Floating Top-Right Screen Controls Toolbar */
.screen-controls {
    position: fixed;
    top: 16px;
    right: 20px;
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(15, 23, 42, 0.75);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    padding: 6px 14px;
    border-radius: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    transition: opacity 0.3s ease;
}

.screen-controls:hover {
    border-color: rgba(255, 255, 255, 0.18);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.5);
}

.control-divider {
    width: 1px;
    height: 16px;
    background: rgba(255, 255, 255, 0.12);
}

.mode-toggle-group {
    display: flex;
    background: rgba(0, 0, 0, 0.3);
    padding: 2px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.btn-ctrl-mode {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 11px;
    font-weight: 600;
    padding: 4px 8px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-ctrl-mode:hover {
    color: var(--text-primary);
}

.btn-ctrl-mode.active {
    background: var(--accent);
    color: #ffffff;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.size-ctrl-group {
    display: flex;
    align-items: center;
    gap: 6px;
}

.ctrl-label {
    font-size: 11px;
    color: var(--text-secondary);
    font-weight: 500;
}

.ctrl-label span {
    color: #c7d2fe;
    font-weight: 600;
}

#danmaku-size-slider {
    width: 70px;
    accent-color: var(--accent);
    cursor: pointer;
}

.btn-screen-control {
    background: var(--accent);
    border: none;
    color: #ffffff;
    font-size: 12px;
    font-weight: 600;
    padding: 5px 10px;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-screen-control:hover {
    filter: brightness(1.15);
    box-shadow: 0 0 12px var(--accent-glow);
}

/* Main danmaku playground */
#danmaku-container {
    position: absolute;
    inset: 0;
    width: 100vw;
    height: 100vh;
    z-index: 2;
    overflow: hidden;
    pointer-events: none;
}

/* Horizontal Flying Danmaku (From Right to Left) */
.danmaku {
    position: absolute;
    white-space: nowrap;
    font-size: var(--danmaku-font-size);
    font-weight: 700;
    line-height: 1.2;
    pointer-events: none;
    display: inline-flex;
    align-items: center;
    gap: 12px;
    will-change: transform;
    opacity: 0.95;
    z-index: 10;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.animate-danmaku {
    animation: flyLeft linear forwards;
}

@keyframes flyLeft {
    from {
        transform: translate3d(100vw, 0, 0);
    }
    to {
        transform: translate3d(-100%, 0, 0);
    }
}

.danmaku-badge {
    font-size: calc(var(--danmaku-font-size) * 0.55);
    padding: 3px 12px;
    border-radius: 20px;
    border: 1.5px solid;
    font-weight: 700;
    letter-spacing: 0.5px;
    backdrop-filter: blur(8px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
    display: inline-flex;
    align-items: center;
}

.danmaku-content {
    letter-spacing: 1px;
    filter: drop-shadow(0 2px 5px rgba(0,0,0,0.85));
}

/* YouTube / Twitch Vertical Stream Feed Mode (由下往上冒出) */
#chat-feed {
    position: absolute;
    top: 0;
    bottom: 20px;
    left: 40px;
    width: 580px;
    max-width: 90vw;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    gap: 12px;
    z-index: 20;
    overflow: hidden;
    pointer-events: none;
}

.chat-message {
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 14px;
    padding: 12px 18px;
    font-size: calc(var(--danmaku-font-size) * 0.72);
    color: var(--text-primary);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
    display: inline-flex;
    align-items: center;
    gap: 12px;
    animation: streamSlideUp 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    width: fit-content;
    max-width: 100%;
    line-height: 1.4;
    word-break: break-word;
}

@keyframes streamSlideUp {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.96);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.chat-badge {
    font-size: 0.8em;
    padding: 2px 10px;
    border-radius: 8px;
    border: 1.5px solid;
    font-weight: 700;
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
}

.chat-content {
    word-break: break-word;
    font-weight: 500;
    letter-spacing: 0.5px;
}

.danmaku.deleting,
.chat-message.deleting {
    opacity: 0 !important;
    transform: scale(0.8) !important;
    transition: all 0.3s ease !important;
}

/* Screen Access Modal Overlay */
.overlay {
    position: fixed;
    inset: 0;
    background: rgba(2, 6, 23, 0.88);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    padding: 20px;
}

.overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.login-card {
    background: rgba(15, 23, 42, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 24px;
    padding: 38px 32px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 25px 60px -12px rgba(0, 0, 0, 0.85);
    text-align: center;
    animation: modalPop 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes modalPop {
    from {
        opacity: 0;
        transform: scale(0.92) translateY(20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.login-card h2 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 8px;
    color: #f8fafc;
}

.login-card p {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.login-card form {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.login-card input {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 14px 16px;
    color: #ffffff;
    font-size: 15px;
    outline: none;
    transition: all 0.2s ease;
    text-align: center;
}

.login-card input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 16px var(--accent-glow);
    background: rgba(255, 255, 255, 0.08);
}

.login-card button {
    background: linear-gradient(135deg, #6366f1, #4f46e5);
    color: #ffffff;
    border: none;
    border-radius: 12px;
    padding: 14px;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.login-card button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.55);
}

.login-card button:active {
    transform: translateY(0);
}

.error-msg {
    color: #ef4444;
    font-size: 13px;
    margin-top: 14px;
    min-height: 18px;
    font-weight: 500;
}