:root {
    --bg-light: #ffffff;
    --bg-dark: #121212;
    --text-light: #000000;
    --text-dark: #ffffff;
    --cell-bg: #f0f0f0;
    --cell-bg-dark: #1e1e1e;
    --border-radius: 10px;
    --accent: #007bff;
}

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

body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    background-color: var(--bg-light);
    color: var(--text-light);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem;  
    min-height: 100vh;
    transition: background-color 0.3s, color 0.3s;
}

body.dark-mode {
    background-color: var(--bg-dark);
    color: var(--text-dark);
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: 600px; 
    padding: 1rem;
    position: relative;
}

.theme-toggle {
    position: absolute;
    left: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: inherit;
    padding: 0.5rem;
    transition: all 0.2s;
    width: 45px;
    height: 45px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
}

.dark-mode .theme-toggle {
    background-color: var(--cell-bg-dark);
}

.theme-toggle:active {
    transform: scale(0.95);
}

h1 {
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
    margin: 0;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.container {
    width: 100%;
    max-width: 600px;
    padding: 0 1rem 2rem 1rem;
}

.target-display {
    text-align: center;
    font-size: 1rem;
    margin: 1rem 0;
    font-weight: 500;
    padding: 0 0.5rem;
}

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

label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

input[type="text"],
textarea,
select {
    width: 100%;
    padding: 1.1rem;
    border: none;
    background-color: var(--cell-bg);
    color: var(--text-light);
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    transition: all 0.3s;
    font-family: inherit;
    margin-top: 0.5rem;
}

.dark-mode input[type="text"],
.dark-mode textarea,
.dark-mode select {
    background-color: var(--cell-bg-dark);
    color: var(--text-dark);
}

textarea {
    resize: vertical;
    min-height: 100px;
}

.color-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.color-input {
    display: flex;
    flex-direction: column;
}

.color-picker-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--cell-bg);
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: background-color 0.3s;
}

.dark-mode .color-picker-wrapper {
    background-color: var(--cell-bg-dark);
}

input[type="color"] {
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    flex-shrink: 0;
    padding: 0;
    outline: none;
    box-shadow: none;
    appearance: none;
    -webkit-appearance: none;
}

input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

input[type="color"]::-webkit-color-swatch {
    border: none;
    border-radius: 50%;
    box-shadow: none;
}

input[type="color"]::-moz-color-swatch {
    border: none;
    border-radius: 50%;
    box-shadow: none;
}

.color-value {
    font-family: monospace;
    font-size: 0.9rem;
    flex: 1;
    font-weight: 500;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
}

button {
    width: 100%;
    padding: 1.1rem;
    background-color: var(--cell-bg);
    color: var(--text-light);
    border: none;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    margin-top: 0.5rem;
}

.dark-mode button {
    background-color: var(--cell-bg-dark);
    color: var(--text-dark);
}

button:active {
    transform: scale(0.98);
    opacity: 0.8;
}

button.primary {
    background-color: var(--accent);
    color: white;
}

.dark-mode button.primary {
    background-color: var(--accent);
    color: white;
}

button.success {
    background-color: #28a745;
    color: white;
}

.dark-mode button.success {
    background-color: #28a745;
    color: white;
}

#qrcode-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 1.5rem 0;
    min-height: 280px;
    background-color: var(--cell-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    transition: background-color 0.3s;
}

.dark-mode #qrcode-container {
    background-color: var(--cell-bg-dark);
}

#qrcode {
    display: inline-block;
}

.download-btn {
    display: none;
}

.info {
    text-align: center;
    font-size: 1rem;
    margin-top: 1.5rem;
    opacity: 0.7;
}

@media (max-width: 600px) {
    h1 {
        font-size: 1.3rem;
    }

    .theme-toggle {
        font-size: 1.2rem;
        width: 40px;
        height: 40px;
        left: 0.75rem;
    }

    header {
        padding: 0.75rem;
    }

    .target-display {
        font-size: 0.9rem;
    }

    .color-group {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

    input[type="color"] {
        width: 45px;
        height: 45px;
    }

    .color-value {
        font-size: 0.85rem;
    }

    input[type="text"],
    textarea,
    select {
        padding: 0.875rem;
        font-size: 1rem;
    }

    button {
        padding: 1rem;
        font-size: 1rem;
    }

    #qrcode-container {
        padding: 1.5rem;
        min-height: 240px;
    }
}

@media (max-width: 380px) {
    h1 {
        font-size: 1.1rem;
    }

    .theme-toggle {
        font-size: 1.1rem;
        width: 38px;
        height: 38px;
    }

    .color-value {
        font-size: 0.8rem;
    }
}

@media (min-width: 900px) {
    .container {
        max-width: 1100px;
        margin: 0 auto;
        padding-left: 10rem;
        padding-right: 10rem;
    }
}