body {
    margin: 0;
    font-family: 'Segoe UI', 'Arial', sans-serif;
    background: var(--bg);
    color: var(--text);
    transition: background 0.3s, color 0.3s;
}
html {
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}
:root {
    --bg: #f7f7fa;
    --text: #222;
    --primary: #4e8cff;
    --accent: #ffb84e;
    --card: #fff;
    --glass: rgba(255,255,255,0.7);
    --glass-dark: rgba(35,36,43,0.7);
    --border: #e0e0e5;
    --shadow: 0 8px 32px rgba(78,140,255,0.08), 0 1.5px 6px rgba(0,0,0,0.04);
}
body.dark {
    --bg: #181a20;
    --text: #f7f7fa;
    --primary: #4e8cff;
    --accent: #ffb84e;
    --card: #23242b;
    --glass: rgba(35,36,43,0.7);
    --glass-dark: rgba(35,36,43,0.85);
    --border: #33343a;
}
.container {
    max-width: 430px;
    margin: 0 auto;
    padding: 1.5rem;
    background: var(--glass);
    border-radius: 2rem;
    box-shadow: var(--shadow);
    margin-top: 2rem;
    min-height: 90vh;
    display: flex;
    flex-direction: column;
    backdrop-filter: blur(16px) saturate(180%);
    border: 1.5px solid var(--border);
    transition: box-shadow 0.3s, background 0.3s;
}
header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    position: sticky;
    top: 0;
    background: var(--glass);
    z-index: 10;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(12px) saturate(180%);
}
.logo {
    width: 54px;
    height: 54px;
    border-radius: 16px;
    box-shadow: 0 2px 8px rgba(78,140,255,0.10);
    background: linear-gradient(135deg, #e0e7ff 0%, #fff 100%);
}
h1 {
    font-size: 1.6rem;
    margin: 0 0 0 0.7rem;
    flex: 1;
    font-weight: 700;
    letter-spacing: 0.01em;
    color: var(--primary);
    text-shadow: 0 1px 0 #fff, 0 2px 8px rgba(78,140,255,0.08);
}
#theme-toggle {
    background: var(--glass);
    border: 1px solid var(--border);
    font-size: 1.7rem;
    cursor: pointer;
    color: var(--primary);
    padding: 0.5rem 0.7rem;
    border-radius: 1.2rem;
    transition: background 0.2s, box-shadow 0.2s;
    box-shadow: 0 1px 4px rgba(78,140,255,0.08);
}
#theme-toggle:active {
    background: var(--accent);
    color: var(--text);
    box-shadow: 0 2px 8px rgba(255,184,78,0.10);
}
form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
    padding-bottom: 0.5rem;
    background: var(--glass);
    border-radius: 1.5rem;
    box-shadow: 0 1px 4px rgba(78,140,255,0.04);
    border: 1px solid var(--border);
}
label {
    font-weight: 600;
    font-size: 1.13rem;
    margin-bottom: 0.2rem;
    color: var(--primary);
}
select, input {
    padding: 1rem;
    border-radius: 1.2rem;
    border: 1px solid var(--border);
    font-size: 1.08rem;
    background: var(--glass);
    color: var(--text);
    margin-bottom: 0.5rem;
    width: 100%;
    box-sizing: border-box;
    box-shadow: 0 1px 4px rgba(78,140,255,0.04);
    outline: none;
    transition: border 0.2s, box-shadow 0.2s;
}
select:focus, input:focus {
    border: 1.5px solid var(--primary);
    box-shadow: 0 0 0 2px rgba(78,140,255,0.15);
}
button[type="submit"] {
    background: linear-gradient(135deg, var(--primary) 60%, var(--accent) 100%);
    color: #fff;
    border: none;
    border-radius: 1.2rem;
    padding: 1rem;
    font-size: 1.15rem;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(78,140,255,0.10);
    transition: background 0.2s, box-shadow 0.2s;
    margin-top: 0.5rem;
    width: 100%;
    font-weight: 600;
    letter-spacing: 0.01em;
}
button[type="submit"]:hover {
    background: linear-gradient(135deg, var(--accent) 60%, var(--primary) 100%);
    color: var(--text);
}
.qr-preview {
    text-align: center;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    background: var(--glass);
    border-radius: 1.5rem;
    box-shadow: 0 1px 4px rgba(78,140,255,0.04);
    border: 1px solid var(--border);
    transition: box-shadow 0.3s, background 0.3s;
}
#qrcode {
    margin: 1rem auto;
    width: 180px;
    height: 180px;
    background: var(--card);
    border-radius: 1.5rem;
    box-shadow: 0 2px 8px rgba(78,140,255,0.10);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: box-shadow 0.3s, background 0.3s;
    border: 1px solid var(--border);
    overflow: hidden;
}
.actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 0.5rem;
    flex-wrap: wrap;
}
.actions button {
    background: linear-gradient(135deg, var(--primary) 60%, var(--accent) 100%);
    color: #fff;
    border: none;
    border-radius: 1.2rem;
    padding: 1rem 1.5rem;
    font-size: 1.08rem;
    cursor: pointer;
    transition: background 0.2s, box-shadow 0.2s;
    min-width: 90px;
    box-shadow: 0 2px 8px rgba(78,140,255,0.10);
    font-weight: 600;
    letter-spacing: 0.01em;
}
.actions button:active {
    background: linear-gradient(135deg, var(--accent) 60%, var(--primary) 100%);
    color: var(--text);
    box-shadow: 0 2px 8px rgba(255,184,78,0.10);
}
.actions button:hover {
    background: linear-gradient(135deg, var(--accent) 60%, var(--primary) 100%);
    color: var(--text);
}
.actions button:focus {
    border: 1.5px solid var(--primary);
    box-shadow: 0 0 0 2px rgba(78,140,255,0.15);
}
footer {
    text-align: center;
    font-size: 0.97rem;
    color: #888;
    margin-top: 1.5rem;
    position: sticky;
    bottom: 0;
    background: var(--glass);
    padding: 0.7rem 0;
    z-index: 10;
    border-top: 1px solid var(--border);
    backdrop-filter: blur(12px) saturate(180%);
}
.qr-history {
    margin-top: 1.5rem;
    background: var(--glass);
    border-radius: 1.2rem;
    box-shadow: 0 1px 4px rgba(78,140,255,0.04);
    border: 1px solid var(--border);
    padding: 1rem 0.7rem 0.7rem 0.7rem;
    transition: box-shadow 0.3s, background 0.3s;
}
.qr-history h2 {
    font-size: 1.08rem;
    margin-bottom: 0.7rem;
    color: var(--primary);
    font-weight: 600;
    letter-spacing: 0.01em;
}
#history-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
}
#history-list li {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 1rem;
    padding: 0.8rem 1rem;
    font-size: 1rem;
    color: var(--text);
    cursor: pointer;
    transition: background 0.2s, box-shadow 0.2s, color 0.2s;
    box-shadow: 0 1px 4px rgba(78,140,255,0.04);
    outline: none;
    font-weight: 500;
    letter-spacing: 0.01em;
    user-select: none;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
#history-list li:active, #history-list li:focus {
    background: var(--accent);
    color: var(--text);
    box-shadow: 0 2px 8px rgba(255,184,78,0.10);
    border: 1.5px solid var(--primary);
}
#history-list li:hover {
    background: var(--primary);
    color: #fff;
}
@media (max-width: 500px) {
    .container {
        padding: 0.7rem;
        margin-top: 0.5rem;
        border-radius: 1rem;
        min-height: 100vh;
    }
    h1 {
        font-size: 1.18rem;
    }
    #qrcode {
        width: 120px;
        height: 120px;
    }
    .actions button {
        padding: 0.7rem 1rem;
        font-size: 1rem;
        min-width: 70px;
    }
    .qr-history {
        padding: 0.7rem 0.3rem 0.3rem 0.3rem;
        border-radius: 0.7rem;
    }
    #history-list li {
        font-size: 0.95rem;
        padding: 0.7rem 0.7rem;
    }
}