:root {
    --bg-color: #0d1117;
    --card-bg: rgba(22, 27, 34, 0.6);
    --border-color: rgba(255, 255, 255, 0.1);
    --text-main: #c9d1d9;
    --text-muted: #8b949e;
    --primary: #58a6ff;
    --primary-hover: #1f6feb;
    --error: #f85149;
    --success: #2ea043;
    --input-bg: rgba(1, 4, 9, 0.3);
    --focus-ring: rgba(88, 166, 255, 0.3);
}

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

body {
    font-family: 'Outfit', -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    padding: 2rem 1rem;
}

/* Background animated blobs */
.background-elements {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 0;
    pointer-events: none;
}

.blob {
    position: absolute;
    filter: blur(80px);
    border-radius: 50%;
    opacity: 0.8;
    animation: float 10s infinite ease-in-out alternate;
}

.blob-1 {
    top: -10%;
    left: -10%;
    width: 50vw;
    height: 50vw;
    background: radial-gradient(circle, rgba(88, 166, 255, 0.4) 0%, rgba(0, 0, 0, 0) 70%);
}

.blob-2 {
    bottom: -10%;
    right: -10%;
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, rgba(138, 43, 226, 0.4) 0%, rgba(0, 0, 0, 0) 70%);
    animation-delay: -5s;
}

@keyframes float {
    0% { transform: translateY(0) scale(1); }
    100% { transform: translateY(-30px) scale(1.05); }
}

.container {
    position: relative;
    z-index: 1;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2.5rem 3rem;
    width: 100%;
    max-width: 700px;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.form-header {
    text-align: center;
    margin-bottom: 2rem;
}

.form-header h1 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #fff, #8b949e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.form-header p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

fieldset {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    background: rgba(255, 255, 255, 0.02);
    transition: border-color 0.3s ease;
}

fieldset:hover {
    border-color: rgba(255, 255, 255, 0.2);
}

.fieldset-no-border {
    border: none;
    padding: 0;
    background: none;
}

legend {
    font-weight: 500;
    font-size: 1.1rem;
    color: var(--primary);
    padding: 0 0.5rem;
    margin-left: -0.5rem;
}

.input-group-row {
    display: flex;
    gap: 1.5rem;
}

.input-group-row .input-group {
    flex: 1;
}

.input-group {
    margin-bottom: 1.5rem;
    position: relative;
}

.input-group:last-child {
    margin-bottom: 0;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    font-weight: 500;
}

.group-label {
    margin-bottom: 0.75rem;
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="date"],
input[type="password"],
textarea,
input[list] {
    width: 100%;
    padding: 0.8rem 1rem;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-main);
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.3s ease;
}

input::placeholder,
textarea::placeholder {
    color: rgba(139, 148, 158, 0.5);
}

input:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--focus-ring);
    background: rgba(1, 4, 9, 0.5);
}

/* HTML5 Validation Styles (using .touched class custom JS logic) */
input.touched:valid,
textarea.touched:valid {
    border-color: var(--success);
}

input.touched:invalid,
textarea.touched:invalid {
    border-color: var(--error);
}

/* Radio & Checkbox Styles */
.radio-options,
.checkbox-options {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.radio-options label,
.checkbox-options label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-weight: 400;
    color: var(--text-muted);
    transition: color 0.3s;
    margin-bottom: 0;
}

.radio-options label:hover,
.checkbox-options label:hover {
    color: var(--text-main);
}

input[type="radio"],
input[type="checkbox"] {
    appearance: none;
    width: 1.25rem;
    height: 1.25rem;
    border: 1px solid var(--border-color);
    background: var(--input-bg);
    position: relative;
    cursor: pointer;
    transition: all 0.2s ease;
}

input[type="radio"] {
    border-radius: 50%;
}

input[type="checkbox"] {
    border-radius: 4px;
}

input[type="radio"]:checked,
input[type="checkbox"]:checked {
    background: var(--primary);
    border-color: var(--primary);
}

input[type="radio"]:checked::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 0.5rem;
    height: 0.5rem;
    background: white;
    border-radius: 50%;
}

input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    top: 40%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(45deg);
    width: 0.3rem;
    height: 0.6rem;
    border: solid white;
    border-width: 0 2px 2px 0;
}

.char-counter {
    text-align: right;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* Custom File Upload */
.file-upload-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.file-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 2;
}

.file-upload-design {
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
}

.file-upload-btn {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border-color);
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    font-size: 0.9rem;
    transition: all 0.3s;
    white-space: nowrap;
}

.file-input:hover + .file-upload-design .file-upload-btn {
    background: rgba(255,255,255,0.1);
}

.file-upload-name {
    font-size: 0.9rem;
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* CGU & Submit */
.terms-group {
    margin-bottom: 2rem;
}

.terms-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
}

.terms-label a {
    color: var(--primary);
    text-decoration: none;
    transition: text-decoration 0.2s;
}

.terms-label a:hover {
    text-decoration: underline;
}

.submit-btn {
    width: 100%;
    background: var(--primary);
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(88, 166, 255, 0.2);
}

.submit-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(88, 166, 255, 0.3);
}

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

.btn-icon {
    width: 1.25rem;
    height: 1.25rem;
    transition: transform 0.3s ease;
}

.submit-btn:hover .btn-icon {
    transform: translateX(4px);
}

/* Animations */
.shake {
    animation: shake 0.4s cubic-bezier(.36,.07,.19,.97) both;
}

@keyframes shake {
    10%, 90% { transform: translate3d(-1px, 0, 0); }
    20%, 80% { transform: translate3d(2px, 0, 0); }
    30%, 50%, 70% { transform: translate3d(-3px, 0, 0); }
    40%, 60% { transform: translate3d(3px, 0, 0); }
}

@media (max-width: 600px) {
    .container {
        padding: 2rem 1.5rem;
    }
    .input-group-row {
        flex-direction: column;
        gap: 0;
    }
}