:root {
    --bg-main: #f4f6fb;
    --panel-bg: #ffffff;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --border: #dbe2f1;
    --primary: #4361ee;
    --primary-hover: #3652d2;
    --shadow-soft: 0 10px 30px rgba(31, 41, 55, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    padding: 72px 20px 24px;
    background: radial-gradient(circle at top right, #eef2ff 0%, var(--bg-main) 50%);
    color: var(--text-main);
    font-family: "Inter", "Segoe UI", Roboto, Arial, sans-serif;
    line-height: 1.45;
}

.page-shell {
    width: min(100%, 560px);
    margin: 0 auto;
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: var(--shadow-soft);
    padding: 26px;
}

h1 {
    margin: 0 0 16px;
    font-size: 1.65rem;
    letter-spacing: -0.02em;
}

h2 {
    margin: 0;
    font-size: 1.05rem;
    letter-spacing: -0.01em;
}

form {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

label {
    font-weight: 600;
    font-size: 0.92rem;
}

input[type="url"] {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 11px 12px;
    font-size: 0.96rem;
    color: var(--text-main);
    background: #fff;
    transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

input[type="url"]:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.16);
}

.color-fields {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.color-field {
    flex: 1 1 160px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

input[type="color"] {
    width: 100%;
    height: 42px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: #fff;
    padding: 4px;
    cursor: pointer;
}

button[type="submit"] {
    border: none;
    border-radius: 10px;
    padding: 12px 14px;
    font-size: 0.95rem;
    font-weight: 600;
    color: #fff;
    background: var(--primary);
    cursor: pointer;
    transition: background-color 0.18s ease, transform 0.12s ease;
}

button[type="submit"]:hover {
    background: var(--primary-hover);
}

button[type="submit"]:active {
    transform: translateY(1px);
}

.preview-section {
    margin-top: 18px;
    border-top: 1px solid var(--border);
    padding-top: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

#qr-preview {
    max-width: 100%;
    width: 280px;
    height: auto;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px;
    background: #fff;
}

.history-section {
    margin-top: 18px;
    border-top: 1px solid var(--border);
    padding-top: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.history-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.history-item {
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.history-meta {
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.history-url {
    font-size: 0.9rem;
    word-break: break-all;
}

.history-time {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.history-download {
    flex-shrink: 0;
    border-radius: 8px;
    border: 1px solid var(--border);
    padding: 7px 10px;
    color: var(--text-main);
    background: #f8faff;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.86rem;
}

.history-download:hover {
    border-color: #c9d4f6;
    background: #f0f4ff;
}

.history-empty {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.error-message {
    margin: 14px 0 0;
    color: #b91c1c;
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: 10px;
    padding: 10px 12px;
    font-size: 0.92rem;
}

/* User profile dropdown (top-right) */
.user-profile-container {
    position: absolute;
    top: 18px;
    right: 18px;
    z-index: 1000;
    display: inline-block;
    padding-bottom: 8px;
}

.user-profile {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border-radius: 10px;
    cursor: pointer;
    color: #fff;
    background-color: var(--primary);
    padding: 10px 16px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.14);
    transition: background-color 0.18s ease, transform 0.12s ease;
}

.user-profile i {
    font-size: 16px;
}

.user-profile:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    display: none;
    flex-direction: column;
    background: #ffffff;
    border: 1px solid var(--border);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    border-radius: 10px;
    min-width: 220px;
    overflow: hidden;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    color: #333;
    text-decoration: none;
    font-size: 0.93rem;
}

.dropdown-item:hover {
    background: #f4f6fb;
}

.dropdown-item.disabled {
    opacity: 0.6;
    pointer-events: none;
}

.user-profile-container:hover .dropdown-menu,
.user-profile-container:focus-within .dropdown-menu {
    display: flex;
}

.guest-actions {
    display: flex;
    gap: 10px;
}

.auth-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 14px;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    color: #fff;
    background: var(--primary);
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.14);
    transition: background-color 0.18s ease, transform 0.12s ease;
}

.auth-button:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.auth-button.secondary {
    background: #6b7280;
}

.auth-button.secondary:hover {
    background: #535b68;
}

@media (max-width: 640px) {
    body {
        padding-top: 82px;
    }

    .page-shell {
        padding: 20px;
    }

    .user-profile-container {
        right: 14px;
        top: 14px;
    }
}