@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* Default (light theme) */
:root {
    --primary-color: #FF6C00;
    --primary-hover: #FF8C3D;
    --background-color: rgba(255, 255, 255, 0.8);
    --surface-color: rgba(240, 240, 240, 0.9);
    --text-color: #000000;
    --secondary-text-color: #555555;
    --border-color: #CCCCCC;
    --input-background: rgba(255, 255, 255, 0.9);
    --input-border: #BBBBBB;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition-speed: 0.3s;
    --font-family: 'Inter', sans-serif;
    --container-padding: 24px;
    --input-padding: 12px 16px;
    --button-padding: 12px 24px;
}

/* Dark theme */
body.dark-theme {
    --background-color: rgba(13, 13, 13, 0.8);
    --surface-color: rgba(26, 26, 26, 0.9);
    --text-color: #FFFFFF;
    --secondary-text-color: #B3B3B3;
    --border-color: #2C2C2C;
    --input-background: rgba(38, 38, 38, 0.9);
    --input-border: #3D3D3D;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: var(--font-family);
    color: var(--text-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    transition: color var(--transition-speed);
}

#bgCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--container-padding);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: background-color var(--transition-speed);
}

header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.glitch-image {
    max-width: 100%;
    height: auto;
    margin-left: -372px;
    margin-bottom: -80px;
    /* Invert the image in light mode */
    filter: invert(1);
}

/* In dark mode, do not invert the image */
body.dark-theme .glitch-image {
    max-width: 100%;
    height: auto;
    margin-left: -372px;
    margin-bottom: -80px;
    /* Invert the image in light mode */
    filter: invert(1);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(90deg, var(--primary-color), #FF9D00);
    background-size: 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: gradient-animation 5s ease infinite;
}

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

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.input-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--secondary-text-color);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

input, select, textarea {
    width: 100%;
    padding: var(--input-padding);
    background-color: var(--input-background);
    border: 1px solid var(--input-border);
    border-radius: 8px;
    color: var(--text-color);
    font-size: 1rem;
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed), background-color var(--transition-speed), color var(--transition-speed);
}

input::placeholder, textarea::placeholder {
    color: var(--secondary-text-color);
}

input:focus, select:focus, textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 108, 0, 0.2);
    outline: none;
}

.btn {
    display: inline-block;
    padding: var(--button-padding);
    background-color: var(--primary-color);
    color: var(--text-color);
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    transition: background-color var(--transition-speed), transform var(--transition-speed), box-shadow var(--transition-speed);
    box-shadow: var(--box-shadow);
}

.btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(255, 108, 0, 0.2);
}

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

#generateButton {
    width: 100%;
    margin-top: 1.5rem;
}

#outputSection {
    margin-top: 3rem;
    background-color: var(--surface-color);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--box-shadow);
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

#outputSection h2 {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

#nfcData {
    background-color: var(--input-background);
    padding: 1.5rem;
    border-radius: 8px;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.9rem;
    color: var(--text-color);
    white-space: pre-wrap;
    word-break: break-word;
    max-height: 400px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

#downloadButton {
    margin-top: 1.5rem;
    width: 100%;
}

footer {
    text-align: center;
    padding: 1.5rem 0;
    margin-top: auto;
}

footer .theme-toggle {
    background-color: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    padding: 8px 16px;
    font-size: 0.9rem;
    border-radius: 20px;
    cursor: pointer;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

footer .theme-toggle:hover {
    background-color: var(--primary-color);
    color: var(--text-color);
}

.hidden {
    display: none;
}

@media screen and (max-width: 768px) {
    .container {
        padding: 16px;
    }

    .glitch-image {
        margin-left: -168px;
        margin-bottom: -60px;
    }

    header h1 {
        font-size: 2rem;
    }

    .input-group {
        margin-bottom: 1.2rem;
    }

    input, select, textarea {
        padding: 10px 14px;
    }

    #outputSection {
        padding: 1.5rem;
    }

    #nfcData {
        font-size: 0.85rem;
        padding: 1.2rem;
    }
}

@media screen and (max-width: 480px) {
    header h1 {
        font-size: 1.7rem;
    }

    .glitch-image {
        margin-left: -100px;
        margin-bottom: -40px;
    }

    .input-group {
        margin-bottom: 1rem;
    }

    label {
        font-size: 0.8rem;
    }

    input, select, textarea {
        padding: 8px 12px;
        font-size: 0.9rem;
    }

    #generateButton, #downloadButton {
        padding: 10px 20px;
        font-size: 0.95rem;
    }

    #outputSection h2 {
        font-size: 1.5rem;
    }

    #nfcData {
        font-size: 0.8rem;
        padding: 1rem;
    }
}

/* Smooth transition for theme change */
body {
    transition: color var(--transition-speed);
}

input, select, textarea, .btn, #outputSection, #nfcData {
    transition: background-color var(--transition-speed), color var(--transition-speed), border-color var(--transition-speed);
}
.button-group {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

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

.btn.sending {
    opacity: 0.7;
    cursor: wait;
}

.send-status {
    margin-top: 0.5rem;
    text-align: center;
    font-size: 0.9rem;
}

.send-status.error {
    color: #ff4444;
}

.send-status.success {
    color: #00c853;
}

#footerLinks a {
    color: #ff6c00;
    text-decoration: none;
  }

#footerLinks a:hover {
    color: #FF8C3D;
    text-decoration: underline;
}
#footerLinks {
    text-align: center;
    width: 100%;
    font-size: 16px;
    color: #ff6c00;
    padding: 10px 0;
    margin-top: auto;
}
#footerLinks a:hover {
    color: #FF8C3D;
}
#footerLinks,
#footerLinks a {
    color: #ff6c00;    
}