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

:root {
    --primary-color: #1DA1F2;
    --secondary-color: #657786;
    --danger-color: #E74C3C;
    --success-color: #27AE60;
    --light-bg: #F7F9FA;
    --border-color: #CED0D4;
    --text-dark: #0F1419;
    --text-light: #536471;
    --white: #FFFFFF;
    --transition: all 0.3s ease;
    --border-radius: 16px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #F7F9FA 0%, #EFF3F4 100%);
    color: var(--text-dark);
    min-height: 100vh;
    padding: 0;
    padding-top: 100px;
}

/* ============================================
   Sticky Header
   ============================================ */
.sticky-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    z-index: 1000;
    padding: 16px 20px;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
}

.sda-logo {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.sda-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.header-title {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.header-title h1 {
    font-size: 20px;
    font-weight: 800;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.header-title p {
    font-size: 11px;
    color: var(--text-light);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.header-progress {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
}

.progress-mini {
    width: 120px;
    height: 3px;
    background: var(--light-bg);
    border-radius: 2px;
    overflow: hidden;
}

.progress-fill-mini {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), #1A91DA);
    width: 16.67%;
    transition: width 0.4s ease;
}

.progress-step {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-dark);
    min-width: 35px;
}

.header-right {
    display: flex;
    gap: 8px;
}

/* ============================================
   Container & Layout
   ============================================ */
.container {
    max-width: 600px;
    margin: 0 auto;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    padding: 40px;
    animation: slideIn 0.4s ease;
    margin-bottom: 40px;
}

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

/* ============================================
   Language Toggle
   ============================================ */
.lang-btn {
    padding: 8px 14px;
    border: 1px solid var(--border-color);
    background: var(--white);
    color: var(--text-dark);
    border-radius: 20px;
    cursor: pointer;
    font-size: 11px;
    font-weight: 700;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.lang-btn:hover {
    background: var(--light-bg);
}

.lang-btn.active {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

/* ============================================
   Progress Indicator (Mobile)
   ============================================ */
.progress-container-mobile {
    display: none;
    margin-bottom: 30px;
}

.progress-bar {
    width: 100%;
    height: 4px;
    background: var(--light-bg);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 12px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), #1A91DA);
    width: 16.67%;
    transition: width 0.4s ease;
    border-radius: 2px;
}

.progress-text {
    text-align: center;
    font-size: 13px;
    color: var(--text-light);
    font-weight: 500;
}

/* ============================================
   Step Title
   ============================================ */
.step-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 30px;
    letter-spacing: -0.5px;
}

/* ============================================
   Form Steps
   ============================================ */
.form-step {
    display: none;
    animation: fadeIn 0.3s ease;
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* ============================================
   Form Groups & Inputs
   ============================================ */
.form-group {
    position: relative;
    margin-bottom: 24px;
    width: 100%;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="date"],
input[type="file"],
select {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    font-size: 15px;
    color: var(--text-dark);
    background: var(--white);
    transition: var(--transition);
    font-family: inherit;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
input[type="date"]:focus,
input[type="file"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(29, 161, 242, 0.1);
}

/* Floating Labels */
input[type="text"]::placeholder,
input[type="email"]::placeholder,
input[type="tel"]::placeholder {
    color: transparent;
}

label {
    position: absolute;
    left: 16px;
    top: 14px;
    font-size: 15px;
    color: var(--text-light);
    pointer-events: none;
    transition: var(--transition);
    transform-origin: left center;
}

input[type="text"]:not(:placeholder-shown) ~ label,
input[type="email"]:not(:placeholder-shown) ~ label,
input[type="tel"]:not(:placeholder-shown) ~ label,
input[type="text"]:focus ~ label,
input[type="email"]:focus ~ label,
input[type="tel"]:focus ~ label,
input[type="date"] ~ label {
    top: -8px;
    left: 12px;
    font-size: 12px;
    color: var(--primary-color);
    background: var(--white);
    padding: 0 4px;
}

select ~ label {
    top: -8px;
    left: 12px;
    font-size: 12px;
    color: var(--primary-color);
    background: var(--white);
    padding: 0 4px;
}

/* Form hints */
.form-hint {
    display: block;
    margin-top: 6px;
    font-size: 12px;
    color: var(--text-light);
    font-style: italic;
}

.form-hint.error {
    color: var(--danger-color);
    font-weight: 500;
}

/* Readonly inputs */
input[readonly] {
    background: var(--light-bg);
    cursor: pointer !important;
}

/* ============================================
   Custom Date Picker
   ============================================ */
.date-picker {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 8px;
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    z-index: 1000;
    padding: 16px;
    width: 320px;
    animation: slideDown 0.2s ease;
}

.date-picker.active {
    display: block;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.date-picker-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    gap: 8px;
}

.date-picker-nav {
    display: flex;
    gap: 8px;
}

.date-picker-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    padding: 6px 12px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.2s;
}

.date-picker-btn:hover {
    background: #1A91DA;
}

.date-picker-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-dark);
    flex: 1;
    text-align: center;
}

.date-picker-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
    margin-bottom: 8px;
}

.date-picker-weekday {
    text-align: center;
    font-size: 11px;
    font-weight: 600;
    color: var(--text-light);
    padding: 6px 0;
}

.date-picker-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
}

.date-picker-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.2s;
    background: var(--light-bg);
    color: var(--text-dark);
}

.date-picker-day:hover:not(.disabled) {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
}

.date-picker-day.other-month {
    color: var(--text-tertiary);
    cursor: not-allowed;
    opacity: 0.5;
}

.date-picker-day.disabled {
    color: #ccc;
    cursor: not-allowed;
    background: #f5f5f5;
}

.date-picker-day.selected {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
    border-color: var(--primary-color);
}

/* Year picker styles */
.date-picker-years {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 4px;
}

.date-picker-year {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    font-size: 10px;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.2s;
    background: var(--light-bg);
    color: var(--text-dark);
    padding: 4px;
}

.date-picker-year:hover:not(.disabled) {
    background: var(--primary-color);
    color: white;
}

.date-picker-year.disabled {
    color: #ccc;
    cursor: not-allowed;
    background: #f5f5f5;
}

.date-picker-year.selected {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Month picker styles */
.date-picker-months {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
}

.date-picker-month {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.2s;
    background: var(--light-bg);
    color: var(--text-dark);
}

.date-picker-month:hover:not(.disabled) {
    background: var(--primary-color);
    color: white;
}

.date-picker-month.disabled {
    color: #ccc;
    cursor: not-allowed;
    background: #f5f5f5;
}

.date-picker-month.selected {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.date-picker-day.selected {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
}

.form-group {
    position: relative;
}

/* ============================================
   Beautiful Photo Upload Section
   ============================================ */
.photo-upload-section {
    width: 100%;
    margin-bottom: 24px;
}

.photo-drop-zone {
    width: 100%;
    padding: 40px 20px;
    border: 2px dashed var(--primary-color);
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(29, 161, 242, 0.05), rgba(29, 161, 242, 0.02));
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    cursor: pointer;
    transition: var(--transition);
}

.photo-drop-zone:hover {
    background: linear-gradient(135deg, rgba(29, 161, 242, 0.1), rgba(29, 161, 242, 0.05));
    border-color: #1a91da;
    transform: translateY(-2px);
}

.photo-drop-zone.dragover {
    background: linear-gradient(135deg, rgba(29, 161, 242, 0.15), rgba(29, 161, 242, 0.1));
    border-color: #1a91da;
    box-shadow: 0 0 0 4px rgba(29, 161, 242, 0.1);
}

.upload-icon {
    width: 48px;
    height: 48px;
    color: var(--primary-color);
    stroke-width: 1.5;
}

.upload-text {
    font-size: 15px;
    color: var(--text-dark);
    font-weight: 600;
    text-align: center;
}

.photo-drop-zone:hover .upload-text {
    color: var(--primary-color);
}

/* ============================================
   Photo Preview Container
   ============================================ */
.photo-preview-container {
    margin-top: 24px;
    border-radius: 12px;
    overflow: hidden;
    background: var(--light-bg);
    padding: 16px;
    animation: fadeIn 0.3s ease;
}

.preview-wrapper {
    position: relative;
    width: 100%;
    max-width: 300px;
    margin: 0 auto;
    border-radius: 12px;
    overflow: hidden;
    background: var(--white);
}

.preview-wrapper img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 8px;
}

.preview-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    opacity: 0;
    transition: opacity 0.3s ease;
    border-radius: 8px;
}

.preview-wrapper:hover .preview-overlay {
    opacity: 1;
}

.preview-btn {
    padding: 10px 16px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 13px;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.change-photo-btn {
    background: var(--primary-color);
    color: var(--white);
}

.change-photo-btn:hover {
    background: #1a91da;
    transform: scale(1.05);
}

.remove-photo-btn {
    background: var(--danger-color);
    color: var(--white);
}

.remove-photo-btn:hover {
    background: #C0392B;
    transform: scale(1.05);
}

/* ============================================
   Buttons
   ============================================ */
.form-navigation {
    display: flex;
    gap: 12px;
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.btn {
    flex: 1;
    padding: 12px 24px;
    border: none;
    border-radius: 24px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.btn-primary:hover {
    background: #1a91da;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(29, 161, 242, 0.3);
}

.btn-primary:disabled {
    background: var(--border-color);
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--light-bg);
    color: var(--text-dark);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: #E8EEF0;
    transform: translateY(-2px);
}

.btn-secondary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-success:hover {
    background: #229954;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(39, 174, 96, 0.3);
}

/* ============================================
   Summary Notice
   ============================================ */
.summary-notice {
    padding: 16px 20px;
    background: #E8F4F8;
    border-left: 4px solid var(--primary-color);
    border-radius: 8px;
    color: #0F5F7F;
    font-size: 14px;
    margin-top: 20px;
    animation: slideIn 0.3s ease;
}

/* ============================================
   Validation
   ============================================ */
input.error,
select.error {
    border-color: var(--danger-color) !important;
}

input.error ~ label,
select.error ~ label {
    color: var(--danger-color) !important;
}

/* ============================================
   Responsive Design - Tablet
   ============================================ */
@media (max-width: 768px) {
    body {
        padding-top: 90px;
    }

    .sticky-header {
        padding: 12px 16px;
    }

    .header-content {
        gap: 12px;
    }

    .sda-logo {
        width: 40px;
        height: 40px;
    }

    .header-title h1 {
        font-size: 18px;
    }

    .header-title p {
        font-size: 10px;
    }

    .progress-mini {
        width: 80px;
    }

    .progress-step {
        font-size: 11px;
    }

    .container {
        padding: 30px 20px;
        border-radius: 12px;
        margin: 16px;
        margin-bottom: 40px;
    }

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

    .form-navigation {
        flex-direction: column-reverse;
    }

    .progress-container-mobile {
        display: block;
    }

    .step-title {
        font-size: 24px;
        margin-bottom: 24px;
    }

    input[type="text"],
    input[type="email"],
    input[type="tel"],
    input[type="date"],
    input[type="file"],
    select {
        padding: 12px 14px;
        font-size: 16px;
    }

    label {
        left: 14px;
    }

    input[type="text"]:not(:placeholder-shown) ~ label,
    input[type="email"]:not(:placeholder-shown) ~ label,
    input[type="tel"]:not(:placeholder-shown) ~ label,
    input[type="text"]:focus ~ label,
    input[type="email"]:focus ~ label,
    input[type="tel"]:focus ~ label,
    input[type="date"] ~ label {
        left: 10px;
    }

    .photo-drop-zone {
        padding: 30px 16px;
    }

    .upload-icon {
        width: 40px;
        height: 40px;
    }

    .upload-text {
        font-size: 13px;
    }

    .btn {
        padding: 11px 20px;
        font-size: 14px;
    }
}

/* ============================================
   Responsive Design - Mobile
   ============================================ */
@media (max-width: 480px) {
    body {
        padding-top: 80px;
    }

    .sticky-header {
        padding: 10px 12px;
    }

    .header-content {
        gap: 8px;
    }

    .sda-logo {
        width: 36px;
        height: 36px;
    }

    .header-title h1 {
        font-size: 16px;
    }

    .header-title p {
        font-size: 9px;
    }

    .progress-mini {
        width: 60px;
        height: 2px;
    }

    .progress-step {
        font-size: 10px;
        min-width: 30px;
    }

    .header-right {
        gap: 4px;
    }

    .lang-btn {
        padding: 6px 10px;
        font-size: 10px;
    }

    .container {
        padding: 20px 16px;
        margin: 10px;
        border-radius: 8px;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    }

    .step-title {
        font-size: 20px;
        margin-bottom: 20px;
    }

    .form-group {
        margin-bottom: 20px;
    }

    input[type="text"],
    input[type="email"],
    input[type="tel"],
    input[type="date"],
    input[type="file"],
    select {
        font-size: 16px;
        padding: 12px 12px;
    }

    label {
        font-size: 13px;
    }

    .btn {
        padding: 10px 16px;
        font-size: 12px;
    }

    .photo-drop-zone {
        padding: 24px 12px;
    }

    .upload-icon {
        width: 36px;
        height: 36px;
    }

    .upload-text {
        font-size: 12px;
    }

    .preview-wrapper {
        max-width: 100%;
    }

    .preview-btn {
        padding: 8px 12px;
        font-size: 12px;
    }
}