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

:root {
    --bg-black: #0A0A0A;
    --text-white: #FFFFFF;
    --text-gray: #808080;
    --accent-teal: #20B8CD;
    --input-bg: #1A1A1A;
    --border-color: #2A2A2A;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', sans-serif;
    background: var(--bg-black);
    color: var(--text-white);
    line-height: 1.6;
    padding: 2rem 1rem;
}

.container {
    max-width: 700px;
    margin: 0 auto;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 3rem;
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-white);
}

.header p {
    color: var(--text-gray);
    font-size: 1rem;
}

/* Form Section */
.form-section {
    background: transparent;
    margin-bottom: 2.5rem;
    padding-bottom: 2.5rem;
    border-bottom: 1px solid var(--border-color);
}

.form-section:last-child {
    border-bottom: none;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.section-header i {
    color: var(--accent-teal);
    font-size: 1.25rem;
}

.section-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-white);
}

/* Form Elements */
.form-group {
    margin-bottom: 1.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-white);
    font-weight: 500;
    font-size: 0.95rem;
}

.required {
    color: var(--accent-teal);
}

input[type="text"],
input[type="email"],
select,
textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-white);
    font-size: 0.95rem;
    transition: all 0.2s ease;
    font-family: inherit;
}

input[type="text"]:focus,
input[type="email"]:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent-teal);
    background: var(--bg-black);
}

input::placeholder,
textarea::placeholder {
    color: var(--text-gray);
}

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

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%2320B8CD' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

select option {
    background: var(--input-bg);
    color: var(--text-white);
}

/* Range Slider */
.slider-group {
    margin-bottom: 1.5rem;
}

.slider-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.slider-value {
    background: var(--accent-teal);
    color: var(--bg-black);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.9rem;
    min-width: 40px;
    text-align: center;
}

input[type="range"] {
    width: 100%;
    height: 4px;
    background: var(--border-color);
    border-radius: 4px;
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-teal);
    cursor: pointer;
    transition: transform 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-teal);
    cursor: pointer;
    border: none;
    transition: transform 0.2s ease;
}

input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.2);
}

/* Checkbox */
.checkbox-group {
    margin: 1.5rem 0;
}

.checkbox-wrapper {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--input-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: border-color 0.2s ease;
}

.checkbox-wrapper:hover {
    border-color: var(--accent-teal);
}

input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--accent-teal);
    margin-top: 2px;
    flex-shrink: 0;
}

.checkbox-label {
    margin: 0;
    cursor: pointer;
    flex: 1;
}

/* Days Selection */
.days-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 0.75rem;
    margin-top: 1rem;
}

.day-checkbox {
    position: relative;
}

.day-checkbox input[type="checkbox"] {
    position: absolute;
    opacity: 0;
}

.day-checkbox label {
    display: block;
    padding: 0.75rem;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    margin: 0;
    font-weight: 500;
}

.day-checkbox input[type="checkbox"]:checked + label {
    background: var(--accent-teal);
    border-color: var(--accent-teal);
    color: var(--bg-black);
}

.day-checkbox label:hover {
    border-color: var(--accent-teal);
}

/* Submit Button */
.submit-btn {
    width: 100%;
    padding: 1rem;
    background: var(--accent-teal);
    color: var(--bg-black);
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: 2rem;
}

.submit-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.submit-btn:active {
    transform: translateY(0);
}

.submit-btn i {
    margin-right: 0.5rem;
}

/* Helper text */
.helper-text {
    font-size: 0.85rem;
    color: var(--text-gray);
    margin-top: 0.5rem;
}

/* Alert/Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

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

.modal {
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    max-width: 400px;
    width: 90%;
    text-align: center;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal i {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.modal.error i {
    color: #FF4444;
}

.modal.success i {
    color: var(--accent-teal);
}

.modal h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-white);
}

.modal p {
    color: var(--text-gray);
    line-height: 1.6;
}

/* Responsive */
@media (max-width: 768px) {
    body {
        padding: 1.5rem 1rem;
    }

    .header h1 {
        font-size: 1.75rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .days-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}