*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    outline: none;
    -webkit-tap-highlight-color: transparent;
}

:root {
    --clr-bg: #f4f6f8;
    --clr-dots: #d0d0d0;
    --clr-ink: #111111;
    --clr-paper: #ffffff;
    --clr-accent: #00e5ff;
    --clr-error: #ff3366;
    --border-width: 4px;
    --transition: 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    --font-header: 'Bangers', cursive;
    --font-body: 'Comic Neue', cursive, sans-serif;
    --shadow-offset: 6px;
}

body {
    min-height: 100vh;
    background-color: var(--clr-bg);
    background-image: radial-gradient(var(--clr-dots) 10%, transparent 11%), radial-gradient(var(--clr-dots) 10%, transparent 11%);
    background-size: 20px 20px;
    background-position: 0 0, 10px 10px;
    color: var(--clr-ink);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px 16px;
    font-family: var(--font-body);
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 800px;
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.header {
    text-align: center;
    background: var(--clr-paper);
    padding: 20px;
    border: var(--border-width) solid var(--clr-ink);
    box-shadow: var(--shadow-offset) var(--shadow-offset) 0 var(--clr-ink);
    transform: rotate(-0.5deg);
}

.logo-text {
    font-family: var(--font-header);
    font-size: 3.5rem;
    color: var(--clr-accent);
    text-shadow: 2px 2px 0 var(--clr-ink), -2px -2px 0 var(--clr-ink), 2px -2px 0 var(--clr-ink), -2px 2px 0 var(--clr-ink), 4px 4px 0 var(--clr-ink);
    letter-spacing: 2px;
}

.tagline {
    font-weight: 700;
    text-transform: uppercase;
    font-size: 1.1rem;
    color: #555;
}

.card {
    background: var(--clr-paper);
    border: var(--border-width) solid var(--clr-ink);
    padding: 40px 30px;
    box-shadow: 10px 10px 0 var(--clr-ink);
    position: relative;
}

.home-link {
    position: absolute;
    top: -15px;
    left: 20px;
    background: var(--clr-paper);
    border: 4px solid var(--clr-ink);
    padding: 5px 15px;
    text-decoration: none;
    font-family: var(--font-header);
    font-size: 1.2rem;
    color: var(--clr-ink);
    box-shadow: 4px 4px 0 var(--clr-ink);
    transition: all 0.2s;
    z-index: 10;
}

.home-link:hover {
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0 var(--clr-ink);
}

.card-title {
    font-family: var(--font-header);
    font-size: 2.8rem;
    letter-spacing: 1px;
    margin-bottom: 5px;
    text-transform: uppercase;
}

.card-subtitle {
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 30px;
    opacity: 0.8;
}

.lobby-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-top: 20px;
}

.lobby-box {
    background: #ffffff;
    border: 4px solid var(--clr-ink);
    padding: 25px;
    box-shadow: 6px 6px 0 var(--clr-ink);
    display: flex;
    flex-direction: column;
    gap: 15px;
    height: 100%;
}

.receive-form-wrap {
    margin-top: auto;
    margin-bottom: auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.box-title {
    font-family: var(--font-header);
    font-size: 1.8rem;
    letter-spacing: 1px;
    color: var(--clr-ink);
    border-bottom: 3px solid var(--clr-ink);
    padding-bottom: 10px;
    margin-bottom: 5px;
}

.drop-zone {
    border: 4px dashed var(--clr-ink);
    padding: 40px 10px;
    text-align: center;
    cursor: pointer;
    background: #fdfdfd;
    transition: all 0.2s;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
}

.drop-zone:hover,
.drop-zone.drag-over {
    background: #e6fdff;
    border-style: solid;
    transform: scale(1.02);
}

.drop-ui .icon-wrap {
    width: 60px;
    height: 60px;
    background: var(--clr-accent);
    border: 4px solid var(--clr-ink);
    border-radius: 50%;
    margin: 0 auto 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 4px 4px 0 var(--clr-ink);
}

.drop-ui svg {
    width: 30px;
    height: 30px;
}

.drop-main-text {
    font-family: var(--font-header);
    font-size: 1.4rem;
    margin-bottom: 5px;
}

.drop-sub-text {
    font-weight: 700;
    font-size: 0.8rem;
    background: var(--clr-ink);
    color: #fff;
    padding: 2px 10px;
}

.receive-desc {
    font-weight: 700;
    font-size: 0.95rem;
    line-height: 1.4;
    color: #444;
}

.input-row {
    display: flex;
    border: 4px solid var(--clr-ink);
    box-shadow: 6px 6px 0 var(--clr-ink);
}

.input-row input {
    flex: 1;
    padding: 12px;
    font-family: monospace;
    font-weight: 700;
    font-size: 1rem;
    border: none;
    background: #f9f9f9;
    min-width: 0;
}

.input-row button {
    background: var(--clr-accent);
    color: var(--clr-ink);
    border: none;
    border-left: 4px solid var(--clr-ink);
    padding: 0 20px;
    font-family: var(--font-header);
    font-size: 1.3rem;
    cursor: pointer;
    transition: background 0.2s;
    white-space: nowrap;
}

.input-row button:active {
    background: #00b3cc;
}

.error-text {
    color: var(--clr-error);
    font-weight: 700;
    font-size: 0.85rem;
    margin-top: 5px;
}

.share-info-layout {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 30px;
    margin-bottom: 30px;
}

.share-details {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.file-card-box {
    display: flex;
    align-items: center;
    gap: 15px;
    background: #f9f9f9;
    border: 3px solid var(--clr-ink);
    padding: 15px;
    box-shadow: 4px 4px 0 var(--clr-ink);
}

.file-emoji {
    font-size: 2.2rem;
}

.file-meta {
    display: flex;
    flex-direction: column;
    text-align: left;
    min-width: 0;
}

.file-meta strong {
    font-size: 1.1rem;
    word-break: break-all;
}

.file-meta span {
    font-size: 0.85rem;
    font-weight: 700;
    opacity: 0.7;
}

.link-box label {
    font-family: var(--font-header);
    font-size: 1.2rem;
    display: block;
    margin-bottom: 8px;
    text-align: left;
}

.manual-room-id {
    font-weight: 700;
    font-size: 0.95rem;
    text-align: left;
    background: #fffde0;
    border: 3px solid var(--clr-ink);
    padding: 8px 12px;
    box-shadow: 4px 4px 0 var(--clr-ink);
    width: fit-content;
}

.qr-container {
    background: #fff;
    border: 4px solid var(--clr-ink);
    padding: 15px;
    box-shadow: 6px 6px 0 var(--clr-ink);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.qr-container img {
    width: 100%;
    max-width: 180px;
    height: auto;
    border: 3px solid var(--clr-ink);
}

.qr-caption {
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
}

#send-progress-container,
.progress-container {
    background: #ffffff;
    border: 4px solid var(--clr-ink);
    padding: 20px;
    box-shadow: 6px 6px 0 var(--clr-ink);
    margin-bottom: 25px;
}

.progress-details {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    font-weight: 700;
}

.progress-label {
    text-transform: uppercase;
    font-size: 0.95rem;
}

.speed-label {
    font-size: 0.9rem;
    background: var(--clr-ink);
    color: #fff;
    padding: 2px 8px;
}

.progress-track {
    height: 25px;
    background: #eee;
    border: 4px solid var(--clr-ink);
    box-shadow: 4px 4px 0 var(--clr-ink);
    position: relative;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--clr-accent);
    width: 0%;
    transition: width 0.1s ease-out;
    border-right: 4px solid var(--clr-ink);
    position: relative;
    overflow: hidden;
    background-image: linear-gradient(90deg,
            rgba(255, 255, 255, 0) 0%,
            rgba(255, 255, 255, 0.4) 50%,
            rgba(255, 255, 255, 0) 100%);
    background-size: 200% 100%;
    animation: shimmer 2s infinite linear;
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.percentage-display {
    font-family: var(--font-header);
    font-size: 1.3rem;
    margin-top: 10px;
    text-align: right;
}

.reset-btn {
    background: #fff;
    border: 4px solid var(--clr-ink);
    padding: 10px 30px;
    font-family: var(--font-header);
    font-size: 1.5rem;
    letter-spacing: 1px;
    cursor: pointer;
    box-shadow: 6px 6px 0 var(--clr-ink);
    transition: 0.2s;
    width: 100%;
    margin-top: 15px;
}

.reset-btn:hover {
    transform: translate(-2px, -2px);
    box-shadow: 8px 8px 0 var(--clr-ink);
}

.reset-btn.danger {
    background: var(--clr-error);
    color: #fff;
}

.main-btn {
    background: var(--clr-accent);
    color: var(--clr-ink);
    border: 4px solid var(--clr-ink);
    padding: 12px 25px;
    font-family: var(--font-header);
    font-size: 1.4rem;
    cursor: pointer;
    box-shadow: 4px 4px 0 var(--clr-ink);
    transition: 0.2s;
}

.main-btn:hover {
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0 var(--clr-ink);
}

#approval-container {
    margin-bottom: 25px;
}

.approval-box {
    background: #ffffcc;
    border: 4px solid var(--clr-ink);
    padding: 25px;
    box-shadow: 6px 6px 0 var(--clr-ink);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    text-align: center;
    transform: rotate(-0.5deg);
}

.approval-pulse {
    font-size: 3rem;
    display: inline-block;
    animation: pulseFlash 1.2s infinite ease-in-out;
}

@keyframes pulseFlash {
    0% { transform: scale(1); }
    50% { transform: scale(1.15); }
    100% { transform: scale(1); }
}

.approval-info h3 {
    font-family: var(--font-header);
    font-size: 2.2rem;
    letter-spacing: 1px;
    color: var(--clr-ink);
    margin-bottom: 5px;
}

.approval-info p {
    font-weight: 700;
    font-size: 1.05rem;
    color: #444;
}

.approval-actions {
    display: flex;
    gap: 15px;
    width: 100%;
    margin-top: 10px;
}

.approval-actions button {
    flex: 1;
    margin: 0;
}

#success-stage {
    text-align: center;
}

.success-header {
    display: flex;
    align-items: center;
    gap: 20px;
    background: var(--clr-accent);
    border: 4px solid var(--clr-ink);
    padding: 20px;
    box-shadow: 6px 6px 0 var(--clr-ink);
    margin-bottom: 30px;
    transform: rotate(0.5deg);
}

.success-icon {
    width: 50px;
    height: 50px;
    background: var(--clr-ink);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
}

.success-title {
    font-family: var(--font-header);
    font-size: 2rem;
    text-align: left;
    line-height: 1;
}

.success-note {
    font-weight: 700;
    font-size: 0.9rem;
    text-align: left;
}

#error-stage {
    text-align: center;
}

.error-badge {
    width: 60px;
    height: 60px;
    background: var(--clr-error);
    color: #fff;
    border: 4px solid var(--clr-ink);
    border-radius: 50%;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-header);
    font-size: 2.5rem;
    box-shadow: 6px 6px 0 var(--clr-ink);
}

.error-ui h2 {
    font-family: var(--font-header);
    font-size: 2.2rem;
    margin-bottom: 10px;
}

.error-ui p {
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 25px;
}

.spacer-top {
    margin-top: 20px;
    margin-bottom: 25px;
}

.hidden {
    display: none !important;
}

@media (max-width: 768px) {
    body {
        display: block;
        padding: 16px 8px;
    }

    .container {
        margin: 0 auto;
        width: 100%;
        gap: 15px;
    }

    .header {
        padding: 15px;
        box-shadow: 4px 4px 0 var(--clr-ink);
    }

    .logo-text {
        font-size: 2.2rem;
    }

    .tagline {
        font-size: 0.9rem;
    }

    .card {
        padding: 24px 12px 35px;
        box-shadow: 6px 6px 0 var(--clr-ink);
    }

    .home-link {
        top: -16px;
        left: 12px;
        font-size: 1rem;
        padding: 4px 10px;
        border-width: 3px;
        box-shadow: 3px 3px 0 var(--clr-ink);
    }

    .card-title {
        font-size: 2.1rem;
        margin-top: 10px;
    }

    .lobby-split {
        grid-template-columns: 1fr;
        gap: 20px;
        margin-bottom: 5px;
    }

    .lobby-box {
        padding: 16px;
        box-shadow: 4px 4px 0 var(--clr-ink);
        height: auto;
    }

    .share-info-layout {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .qr-container {
        max-width: 250px;
        margin: 0 auto;
    }

    .approval-actions {
        flex-direction: column;
        gap: 10px;
    }
}