:root {
    --bg-color: #ffffff;
    --text-color: #000000;
    --accent-color: #000000;
    --border-color: #e0e0e0;
    --light-gray: #f5f5f5;
    --medium-gray: #888888;
    --font-family: 'Inter', sans-serif;
    --radius: 8px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 32px;
    --spacing-xl: 64px;
    --container-width: 700px;
}

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

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

.app-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.logo {
    font-weight: 900;
    font-size: 1.5rem;
    letter-spacing: -0.05em;
}

.logo a {
    text-decoration: none;
    color: var(--text-color);
}

nav a {
    text-decoration: none;
    color: var(--medium-gray);
    font-weight: 500;
    font-size: 0.9rem;
    transition: color 0.2s;
}

nav a:hover,
nav a.active {
    color: var(--text-color);
}

/* Typography */
h1 {
    font-weight: 800;
    font-size: 3rem;
    line-height: 1.1;
    letter-spacing: -0.04em;
    margin-bottom: var(--spacing-md);
}

h2 {
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: -0.03em;
    margin-bottom: var(--spacing-md);
}

p {
    color: var(--medium-gray);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-lg);
}

/* Forms & Inputs */
.form-group {
    margin-bottom: var(--spacing-lg);
}

label {
    display: block;
    font-weight: 600;
    font-size: 0.85rem;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

input[type="text"],
textarea,
select {
    width: 100%;
    padding: 16px;
    font-family: var(--font-family);
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background: transparent;
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
    color: var(--text-color);
}

input[type="text"]:focus,
textarea:focus,
select:focus {
    border-color: var(--text-color);
    box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.05);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    font-family: var(--font-family);
    font-weight: 600;
    font-size: 1rem;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
    border: 2px solid transparent;
}

.btn.primary {
    background-color: var(--text-color);
    color: var(--bg-color);
    border: 2px solid var(--text-color);
}

.btn.primary:hover {
    background-color: #333;
    border-color: #333;
    transform: translateY(-1px);
}

.btn.secondary {
    background-color: transparent;
    color: var(--text-color);
    border: 2px solid var(--border-color);
}

.btn.secondary:hover {
    border-color: var(--text-color);
}

.actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

/* Builder Specifics */
.question-card {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    position: relative;
    transition: box-shadow 0.2s;
}

.question-card:hover {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.03);
}

.question-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.question-number {
    font-weight: 900;
    color: var(--border-color);
    font-size: 1.5rem;
}

.remove-question {
    background: none;
    border: none;
    color: var(--medium-gray);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0 8px;
    transition: color 0.2s;
}

.remove-question:hover {
    color: #ff4444;
    /* Keep strictly black white? Maybe just black for error state */
    color: #000;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.95);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
    backdrop-filter: blur(5px);
}

.modal.visible {
    opacity: 1;
    pointer-events: all;
}

.modal-content {
    background: white;
    padding: var(--spacing-xl);
    border: 1px solid var(--text-color);
    border-radius: var(--radius);
    width: 90%;
    max-width: 500px;
    position: relative;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.1);
}

.close-modal {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    font-size: 1.5rem;
    cursor: pointer;
}

.link-box {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

#generatedLink {
    flex-grow: 1;
    background: var(--light-gray);
    border: none;
    font-size: 0.9rem;
}

#copyLinkBtn {
    padding: 0 20px;
    background: var(--text-color);
    color: white;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 600;
}

.hidden {
    display: none !important;
}

/* Survey Taking Styles */
.centered-message {
    text-align: center;
    margin-top: 20vh;
}

.survey-item {
    margin-bottom: var(--spacing-xl);
}

.survey-question-text {
    font-weight: 600;
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

.radio-group label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 400;
    text-transform: none;
    margin-bottom: 8px;
    cursor: pointer;
}

.radio-group input[type="radio"] {
    accent-color: black;
    width: 20px;
    height: 20px;
}

.rating-group {
    display: flex;
    gap: 10px;
}

.rating-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
}

.rating-option input {
    margin-bottom: 5px;
}

@media (max-width: 600px) {
    h1 {
        font-size: 2.2rem;
    }

    .actions {
        flex-direction: column;
    }

    .app-container {
        padding: 20px;
    }
}