*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    outline: none;
}

:root {
    --clr-bg: #f4f6f8;
    --clr-dots: #d0d0d0;
    --clr-ink: #111111;
    --clr-paper: #ffffff;
    --clr-accent: #ccff00;
    --clr-error: #ff3366;
    --border-width: 4px;
    --transition: 0.6s 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-paper);
    background-image: radial-gradient(var(--clr-dots) 15%, transparent 16%), radial-gradient(var(--clr-dots) 15%, transparent 16%);
    background-size: 20px 20px;
    background-position: 0 0, 10px 10px;
    color: var(--clr-ink);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 24px 16px 48px;
    font-family: var(--font-body);
}

.container {
    width: 100%;
    max-width: 650px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    z-index: 1;
    position: relative;
}

.header {
    text-align: center;
    background: var(--clr-paper);
    padding: 14px 20px;
    border: var(--border-width) solid var(--clr-ink);
    box-shadow: var(--shadow-offset) var(--shadow-offset) 0 var(--clr-ink);
    transform: rotate(-1.2deg);
}

.logo-text {
    font-family: var(--font-header);
    font-size: 3.2rem;
    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: 1rem;
    color: #555;
    margin-top: 4px;
}

.card {
    background: var(--clr-paper);
    border: var(--border-width) solid var(--clr-ink);
    padding: 45px 35px 35px;
    box-shadow: var(--shadow-offset) var(--shadow-offset) 0 var(--clr-ink);
    position: relative;
}

.card::before {
    content: '';
    position: absolute;
    top: 6px;
    left: 6px;
    right: 6px;
    bottom: 6px;
    border: 2px solid var(--clr-ink);
    pointer-events: none;
}

.home-link {
    position: absolute;
    top: -15px;
    left: 20px;
    background: var(--clr-paper);
    border: var(--border-width) 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);
    z-index: 10;
    transition: all var(--transition);
    text-transform: uppercase;
}

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

.card-title {
    font-family: var(--font-header);
    font-size: 2.6rem;
    letter-spacing: 1px;
    margin-bottom: 4px;
    text-transform: uppercase;
}

.card-subtitle {
    opacity: 0.75;
    margin-bottom: 24px;
}

.tab-switcher {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
    background: #eee;
    padding: 6px;
    border: var(--border-width) solid var(--clr-ink);
    box-shadow: 4px 4px 0 var(--clr-ink);
}

.tab-btn {
    flex: 1;
    border: none;
    background: transparent;
    padding: 10px;
    font-family: var(--font-header);
    font-size: 1.4rem;
    cursor: pointer;
    transition: all 0.2s;
    border: 2px solid transparent;
}

.tab-btn.active {
    background: var(--clr-accent);
    border: 2px solid var(--clr-ink);
    box-shadow: 2px 2px 0 var(--clr-ink);
}

#qr-reader-container {
    width: 100%;
    border: var(--border-width) solid var(--clr-ink);
    box-shadow: 6px 6px 0 var(--clr-ink);
    background: #000;
    overflow: hidden;
    position: relative;
    margin-bottom: 20px;
}

#qr-reader {
    width: 100% !important;
    border: none !important;
}

#qr-reader img {
    display: none;
}

.scan-overlay {
    background: var(--clr-paper);
    padding: 15px;
    border-top: var(--border-width) solid var(--clr-ink);
    text-align: center;
}

.decoded-content-box {
    background: #fff;
    border: var(--border-width) solid var(--clr-ink);
    padding: 20px;
    box-shadow: 5px 5px 0 var(--clr-ink);
    margin-bottom: 20px;
    word-break: break-all;
    max-height: 200px;
    overflow-y: auto;
    font-weight: 700;
    font-size: 1.1rem;
}

.scan-actions {
    display: flex;
    gap: 12px;
    width: 100%;
}

.input-group {
    display: flex;
    border: var(--border-width) solid var(--clr-ink);
    box-shadow: 4px 4px 0 var(--clr-ink);
    transition: all var(--transition);
    background: #fff;
}

.input-group:focus-within {
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0 var(--clr-ink);
}

.input-group.error {
    border-color: var(--clr-error);
    box-shadow: 4px 4px 0 var(--clr-error);
}

.input-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 15px;
    background: #f0f0f0;
    border-right: var(--border-width) solid var(--clr-ink);
}

.input-icon svg {
    width: 22px;
    height: 22px;
}

.url-input {
    flex: 1;
    background: transparent;
    border: none;
    padding: 14px 16px;
    font-family: var(--font-body);
    font-weight: 700;
    font-size: 1rem;
}

.paste-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-left: 2px solid var(--clr-ink);
    padding: 0 16px;
    color: var(--clr-ink);
    cursor: pointer;
    transition: background 0.2s;
}

.paste-btn:hover {
    background: var(--clr-accent);
}

.submit-btn {
    width: 100%;
    margin-top: 20px;
    background: var(--clr-accent);
    border: var(--border-width) solid var(--clr-ink);
    padding: 16px 30px;
    font-family: var(--font-header);
    font-size: 2rem;
    letter-spacing: 2px;
    cursor: pointer;
    box-shadow: 6px 6px 0 var(--clr-ink);
    transition: all var(--transition);
}

.submit-btn:hover {
    transform: translate(-3px, -3px);
    box-shadow: 9px 9px 0 var(--clr-ink);
}

.error-msg {
    color: #fff;
    background: var(--clr-error);
    font-family: var(--font-header);
    font-size: 1.1rem;
    padding: 5px 12px;
    border: 2px solid var(--clr-ink);
    display: none;
    margin-top: 12px;
    box-shadow: 3px 3px 0 var(--clr-ink);
    transform: rotate(-1deg);
}

.error-msg.visible {
    display: inline-block;
    animation: shake 0.4s ease;
}

@keyframes shake {
    0%,
    100% {
        transform: rotate(-1deg) translateX(0);
    }
    25% {
        transform: rotate(-1deg) translateX(-5px);
    }
    75% {
        transform: rotate(-1deg) translateX(5px);
    }
}

#result-stage {
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
}

.hidden {
    display: none !important;
}

.result-header {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--clr-accent);
    border: var(--border-width) solid var(--clr-ink);
    padding: 14px 18px;
    box-shadow: 5px 5px 0 var(--clr-ink);
    transform: rotate(0.5deg);
}

.result-icon {
    width: 40px;
    height: 40px;
    background: var(--clr-ink);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
}

.result-title {
    font-family: var(--font-header);
    font-size: 1.8rem;
}

.qr-display-box {
    background: #ffffff;
    border: var(--border-width) solid var(--clr-ink);
    padding: 25px;
    box-shadow: 8px 8px 0 var(--clr-ink);
    display: flex;
    justify-content: center;
    align-items: center;
}

.qr-display-box img,
.qr-display-box canvas {
    width: 300px !important;
    height: 300px !important;
    display: block;
}

.qr-actions {
    display: flex;
    gap: 14px;
    width: 100%;
}

.action-btn {
    flex: 1;
    border: var(--border-width) solid var(--clr-ink);
    padding: 12px;
    font-family: var(--font-header);
    font-size: 1.4rem;
    text-align: center;
    cursor: pointer;
    text-decoration: none;
    color: var(--clr-ink);
    box-shadow: 4px 4px 0 var(--clr-ink);
    transition: all var(--transition);
}

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

.action-btn.primary {
    background: var(--clr-accent);
}

.how-card {
    background: var(--clr-paper);
    border: var(--border-width) solid var(--clr-ink);
    padding: 22px 28px;
    box-shadow: var(--shadow-offset) var(--shadow-offset) 0 var(--clr-ink);
    transform: rotate(0.8deg);
    transition: all 0.5s ease;
}

.how-card.hidden {
    opacity: 0;
    max-height: 0;
    padding: 0;
    margin: 0;
    border: none;
}

.how-title {
    font-family: var(--font-header);
    font-size: 1.6rem;
    margin-bottom: 16px;
    background: var(--clr-accent);
    padding: 3px 12px;
    border: 2px solid var(--clr-ink);
    display: inline-block;
    transform: rotate(-1.5deg);
}

.how-steps {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.how-step {
    flex: 1;
    min-width: 120px;
    text-align: center;
}

.how-num {
    width: 40px;
    height: 40px;
    border: 3px solid var(--clr-ink);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-header);
    font-size: 1.5rem;
    margin: 0 auto 10px;
}

@media (max-width: 500px) {
    .card {
        padding: 40px 16px 24px;
    }
    .card::before {
        top: 4px;
        left: 4px;
        right: 4px;
        bottom: 4px;
    }
    .input-group {
        max-width: 100%;
        overflow: hidden;
    }
    .url-input {
        min-width: 0;
        padding: 12px 10px;
        font-size: 0.9rem;
    }
    .input-icon {
        padding: 0 10px;
        flex-shrink: 0;
    }
    .paste-btn {
        padding: 0 10px;
        flex-shrink: 0;
    }
    .paste-btn svg {
        width: 18px;
        height: 18px;
    }
    .submit-btn {
        font-size: 1.6rem;
        padding: 14px 20px;
    }
    .qr-actions {
        flex-direction: column;
    }
    .logo-text {
        font-size: 2.2rem;
    }
    .card-title {
        font-size: 2rem;
    }
    .card-subtitle {
        font-size: 0.9rem;
    }
    .how-card {
        padding: 16px 14px;
    }
}