:root {
    --bg: #f8fafc;
    --card: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --primary: #4f46e5;
    --success: #10b981;
    --input-bg: #ffffff;
}

.dark-theme {
    --bg: #0f172a;
    --card: #1e293b;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #334155;
    --primary: #6366f1;
    --success: #34d399;
    --input-bg: #0f172a;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg);
    color: var(--text-main);
    margin: 0;
    padding: 0;
    transition: background 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
}

header {
    width: 100%;
    max-width: 650px;
    padding: 60px 20px 30px;
    box-sizing: border-box;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 { margin: 0; font-size: 2rem; letter-spacing: -1px; }
header p { color: var(--text-muted); margin-top: 5px; }

#themeToggle {
    background: var(--card);
    border: 1px solid var(--border);
    padding: 8px 12px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1.2rem;
}

main {
    width: 100%;
    max-width: 650px;
    padding: 0 20px;
    box-sizing: border-box;
}

.tool-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.card-header h2 { font-size: 1.1rem; margin: 0; }

.text-link {
    background: none;
    border: none;
    color: var(--text-muted);
    text-decoration: underline;
    cursor: pointer;
    font-size: 0.85rem;
}

textarea, input[type="text"] {
    width: 100%;
    background: var(--input-bg);
    color: var(--text-main);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    font-size: 1rem;
    font-family: inherit;
    box-sizing: border-box;
    outline: none;
}

textarea { min-height: 120px; resize: vertical; }

.button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
}

button {
    background: var(--card);
    color: var(--text-main);
    border: 1px solid var(--border);
    padding: 10px 16px;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
}

.primary-btn {
    background: var(--primary);
    color: white;
    border: none;
    margin-left: auto;
}

.primary-btn:hover { background: var(--success); color: white; }

footer {
    padding: 40px;
    color: var(--text-muted);
    font-size: 0.8rem;
    text-align: center;
}

.feedback-container {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 250px;
    background: var(--card);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    z-index: 9999; 
    font-size: 14px;
}

.close-btn {
    position: absolute;
    top: 5px;
    right: 10px;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 20px;
}


#feedback-form label {
    display: block;
    margin: 5px 0;
    cursor: pointer;
}

#feedback-form p { margin-bottom: 5px; }
#submit-feedback {
    margin-top: 10px;
    width: 100%;
    padding: 8px;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

@media (max-width: 768px) {
    .feedback-container {
        position: relative;
        top: 0;
        right: 0;
        width: 100%;
        box-sizing: border-box;
        border-radius: 0;
        border-left: none;
        border-right: none;
        border-top: none;
        margin-bottom: 0;
        box-shadow: none;
        align-self: stretch;
        flex-shrink: 0;
    }

    header {
        padding-top: 20px;
    }

    .close-btn {
        top: 10px;
        right: 15px;
    }
}