/* ===== CSS Variables ===== */
:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #ec4899;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --background-color: #f8fafc;
    --card-background: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: all 0.3s ease;
}

/* ===== Reset & Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
    color: var(--text-primary);
}

/* ===== Container ===== */
.container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--card-background);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    position: relative;
}

/* ===== Progress Bar ===== */
.progress-container {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    padding: 30px 40px;
    position: relative;
}

.progress-bar {
    height: 6px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 25px;
}

.progress {
    height: 100%;
    background: #ffffff;
    border-radius: 10px;
    width: 25%;
    transition: width 0.5s ease;
}

.progress-steps {
    display: flex;
    justify-content: space-between;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    opacity: 0.6;
    transition: var(--transition);
}

.step.active {
    opacity: 1;
}

.step.completed {
    opacity: 1;
}

.step-icon {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-size: 18px;
    transition: var(--transition);
}

.step.active .step-icon {
    background: #ffffff;
    color: var(--primary-color);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.step.completed .step-icon {
    background: var(--success-color);
    color: #ffffff;
}

.step span {
    color: #ffffff;
    font-size: 12px;
    font-weight: 500;
    text-align: center;
}

/* ===== Form Sections ===== */
.form-section {
    display: none;
    padding: 40px;
    animation: fadeIn 0.5s ease;
}

.form-section.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section-header {
    margin-bottom: 30px;
    text-align: center;
}

.section-header h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.section-header h2 i {
    color: var(--primary-color);
}

.section-header p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* ===== Form Grid ===== */
.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.form-group {
    position: relative;
}

.form-group.full-width {
    grid-column: span 2;
}

/* ===== Labels ===== */
label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
}

label i {
    color: var(--primary-color);
    font-size: 14px;
}

.required {
    color: var(--error-color);
}

/* ===== Hints ===== */
.hint {
    display: block;
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 5px;
    font-style: italic;
}

/* ===== Inputs & Selects ===== */
input[type="text"],
input[type="email"],
input[type="tel"],
input[type="date"],
select,
textarea {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-family: inherit;
    color: var(--text-primary);
    background: var(--card-background);
    transition: var(--transition);
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

input:valid:not(:placeholder-shown) {
    border-color: var(--success-color);
}

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

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='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 18px;
    padding-right: 40px;
}

/* ===== File Upload ===== */
.file-upload-wrapper {
    position: relative;
}

.file-upload-wrapper input[type="file"] {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    opacity: 0;
    cursor: pointer;
    z-index: 2;
}

.file-upload-label {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: 25px 20px;
    text-align: center;
    background: #f8fafc;
    transition: var(--transition);
}

.file-upload-wrapper:hover .file-upload-label {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.file-upload-label i {
    font-size: 28px;
    color: var(--primary-color);
    margin-bottom: 8px;
    display: block;
}

.file-upload-label span {
    display: block;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 4px;
    font-size: 13px;
}

.file-upload-label small {
    color: var(--text-muted);
    font-size: 11px;
}

.file-preview {
    margin-top: 10px;
    padding: 12px;
    background: #f0fdf4;
    border-radius: var(--radius-sm);
    display: none;
    align-items: center;
    gap: 10px;
    border: 1px solid #bbf7d0;
}

.file-preview.active {
    display: flex;
}

.file-preview i {
    color: var(--success-color);
    font-size: 18px;
}

.file-preview .file-info {
    flex: 1;
}

.file-preview .file-name {
    font-size: 13px;
    color: var(--text-primary);
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 200px;
    display: block;
}

.file-preview .file-size {
    font-size: 11px;
    color: var(--text-muted);
}

.file-preview .remove-file {
    background: none;
    border: none;
    color: var(--error-color);
    cursor: pointer;
    padding: 5px;
    font-size: 16px;
    transition: var(--transition);
}

.file-preview .remove-file:hover {
    transform: scale(1.2);
}

/* ===== Checkbox ===== */
.checkbox-inline {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
}

.checkbox-inline input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
    cursor: pointer;
}

.checkbox-inline label {
    margin: 0;
    font-weight: 400;
    cursor: pointer;
    font-size: 13px;
}

/* ===== Terms Section ===== */
.terms-section {
    background: #fef3c7;
    border: 1px solid #fcd34d;
    border-radius: var(--radius-md);
    padding: 15px 20px;
    margin-top: 20px;
}

.terms-section .checkbox-inline label {
    color: #92400e;
}

/* ===== Error Messages ===== */
.error-message {
    display: none;
    color: var(--error-color);
    font-size: 12px;
    margin-top: 5px;
}

.form-group.error input,
.form-group.error select,
.form-group.error textarea {
    border-color: var(--error-color);
    background-color: #fef2f2;
}

.form-group.error .error-message {
    display: block;
}

.form-group.error .file-upload-label {
    border-color: var(--error-color);
    background-color: #fef2f2;
}

/* ===== Navigation Buttons ===== */
.form-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-prev {
    background: #f1f5f9;
    color: var(--text-secondary);
}

.btn-prev:hover:not(:disabled) {
    background: #e2e8f0;
    color: var(--text-primary);
}

.btn-next,
.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: #ffffff;
    margin-left: auto;
}

.btn-next:hover:not(:disabled),
.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-submit {
    background: linear-gradient(135deg, var(--success-color) 0%, #059669 100%);
    color: #ffffff;
}

.btn-submit:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.4);
}

/* ===== Modals ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: #ffffff;
    padding: 50px;
    border-radius: var(--radius-xl);
    text-align: center;
    max-width: 450px;
    animation: modalPop 0.3s ease;
}

@keyframes modalPop {
    from {
        transform: scale(0.8);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.modal-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
}

.modal-icon.success {
    background: #dcfce7;
    color: var(--success-color);
}

.modal-icon.error {
    background: #fee2e2;
    color: var(--error-color);
}

.modal-icon i {
    font-size: 40px;
}

.modal-content h2 {
    font-size: 24px;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 30px;
}

/* ===== Loading Overlay ===== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.95);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1001;
}

.loading-overlay.active {
    display: flex;
}

.loader {
    text-align: center;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid #e2e8f0;
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loader p {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 18px;
    margin-bottom: 5px;
}

.loader small {
    color: var(--text-muted);
    font-size: 13px;
}

/* ===== Shake Animation ===== */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .progress-container {
        padding: 20px;
    }

    .progress-steps {
        gap: 5px;
    }

    .step span {
        display: none;
    }

    .step-icon {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }

    .form-section {
        padding: 25px;
    }

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

    .form-group.full-width {
        grid-column: span 1;
    }

    .form-navigation {
        flex-direction: column;
        gap: 15px;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .btn-next,
    .btn-submit {
        margin-left: 0;
    }

    .modal-content {
        margin: 20px;
        padding: 30px;
    }

    .file-preview .file-name {
        max-width: 150px;
    }
}

/* ===== Custom Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}