/* =========================
   PAYMENT PAGE STYLES
========================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #0f172a;
    --text: #334155;
    --text-light: #64748b;
    --bg: #f8fafc;
    --white: #ffffff;
    --border: #e2e8f0;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
}

body {
    font-family:
        "Inter",
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* =========================
   HEADER
========================= */
.payment-header {
    background: var(--white);
    border-bottom: 1px solid var(--border);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.payment-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.back-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text);
    font-weight: 500;
    transition: color 0.3s;
    text-decoration: none;
}

.back-link:hover {
    color: var(--primary);
}

.back-link i {
    width: 20px;
    height: 20px;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: -0.5px;
}

/* =========================
   MAIN CONTENT
========================= */
.payment-main {
    flex: 1;
    padding: 48px 0;
}

.payment-layout {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 40px;
    align-items: start;
}

/* =========================
   FORM SECTION
========================= */
.payment-form-section {
    background: var(--white);
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.section-header {
    margin-bottom: 32px;
}

.section-header h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 8px;
}

.section-header h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: 8px;
}

.section-header p {
    color: var(--text-light);
    font-size: 15px;
}

/* =========================
   FORM
========================= */
.payment-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    color: var(--secondary);
    font-size: 14px;
}

.form-group label i {
    width: 18px;
    height: 18px;
    color: var(--primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1.5px solid var(--border);
    border-radius: 10px;
    font-size: 15px;
    font-family: "Inter", sans-serif;
    color: var(--secondary);
    transition: all 0.3s;
    background: var(--white);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: #94a3b8;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

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

.form-group select {
    cursor: pointer;
}

/* =========================
   FILE UPLOAD
========================= */
.file-upload {
    position: relative;
}

.file-upload input[type="file"] {
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
    overflow: hidden;
    z-index: -1;
}

.file-upload-label {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    border: 2px dashed var(--border);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
    background: var(--bg);
}

.file-upload-label:hover {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.05);
}

.file-upload-label i {
    width: 20px;
    height: 20px;
    color: var(--primary);
}

.file-upload-label span {
    color: var(--text);
    font-size: 15px;
}

/* =========================
   FORM DIVIDER
========================= */
.form-divider {
    height: 1px;
    background: var(--border);
    margin: 16px 0;
}

/* =========================
   SUPPORTED CARDS INFO
========================= */
.supported-cards-info {
    background: var(--bg);
    padding: 16px;
    border-radius: 12px;
    margin-bottom: 24px;
    border: 1px solid var(--border);
}

.supported-cards-info p {
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 12px;
}

.supported-cards {
    display: flex;
    gap: 16px;
    align-items: center;
}

.supported-cards img {
    height: 28px;
    width: auto;
    object-fit: contain;
}

/* =========================
   PAYMENT METHOD TABS
========================= */
.payment-method-tabs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 24px;
}

.payment-tab {
    position: relative;
    cursor: pointer;
}

.payment-tab input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.payment-tab span {
    display: block;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
    font-size: 14px;
    color: var(--text);
    transition: all 0.3s;
    background: var(--white);
}

.payment-tab input[type="radio"]:checked + span {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.05);
    color: var(--primary);
}

.payment-tab:not(.disabled):hover span {
    border-color: var(--primary);
}

.payment-tab.disabled {
    cursor: not-allowed;
}

.payment-tab.disabled span {
    background: var(--bg);
    color: var(--text-light);
    opacity: 0.6;
}

.payment-tab.active span {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.05);
    color: var(--primary);
}

/* =========================
   CUSTOM CARD FORM
========================= */
.custom-card-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding: 24px;
    background: var(--bg);
    border-radius: 12px;
    border: 1px solid var(--border);
    margin-bottom: 24px;
}

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

@media (max-width: 480px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* =========================
   SUBMIT BUTTON
========================= */
.btn-submit {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    padding: 16px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    font-family: "Inter", sans-serif;
}

.btn-submit:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.3);
}

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

.btn-submit i {
    width: 20px;
    height: 20px;
}

.payment-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--text-light);
    font-size: 13px;
    margin-top: -8px;
}

.payment-note i {
    width: 16px;
    height: 16px;
    color: var(--success);
}

/* =========================
   MENTOR INFO CARD
========================= */
.mentor-info-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border-radius: 12px;
    border: 2px solid var(--primary);
    margin-bottom: 24px;
}

.mentor-avatar-small {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.mentor-avatar-small i {
    width: 30px;
    height: 30px;
    color: var(--white);
}

.mentor-details {
    flex: 1;
}

.mentor-details h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: 4px;
}

.mentor-details p {
    font-size: 14px;
    color: var(--text-light);
    margin: 0;
}

/* =========================
   ORDER SUMMARY
========================= */
.order-summary {
    position: sticky;
    top: 100px;
}

.summary-card {
    background: var(--white);
    padding: 32px;
    border-radius: 16px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    margin-bottom: 20px;
}

.summary-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 24px;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.summary-label {
    color: var(--text-light);
    font-size: 14px;
}

.summary-value {
    color: var(--secondary);
    font-weight: 500;
    font-size: 14px;
}

.summary-divider {
    height: 1px;
    background: var(--border);
    margin: 20px 0;
}

.summary-total {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 20px;
}

.summary-total span:first-child {
    font-size: 16px;
    font-weight: 600;
    color: var(--secondary);
}

.total-amount {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
}

.summary-features {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    font-size: 14px;
}

.feature-item i {
    width: 18px;
    height: 18px;
    color: var(--success);
}

/* =========================
   SECURITY BADGES
========================= */
.security-badges {
    display: flex;
    gap: 12px;
}

.security-badges .badge {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 16px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 12px;
    font-size: 13px;
    color: var(--text);
    font-weight: 500;
}

.security-badges .badge i {
    width: 18px;
    height: 18px;
    color: var(--success);
}

/* =========================
   FOOTER
========================= */
.payment-footer {
    background: var(--white);
    border-top: 1px solid var(--border);
    padding: 24px 0;
    margin-top: auto;
}

.payment-footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.payment-footer p {
    color: var(--text-light);
    font-size: 14px;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text);
    font-size: 14px;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: var(--primary);
}

/* =========================
   RESPONSIVE
========================= */
@media (max-width: 992px) {
    .payment-layout {
        grid-template-columns: 1fr;
    }

    .order-summary {
        position: static;
    }
}

@media (max-width: 768px) {
    .payment-main {
        padding: 24px 0;
    }

    .payment-form-section {
        padding: 24px;
    }

    .section-header h2 {
        font-size: 24px;
    }

    .section-header h3 {
        font-size: 18px;
    }

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

    .summary-card {
        padding: 24px;
    }

    .security-badges {
        flex-direction: column;
    }

    .payment-footer .container {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        flex-direction: column;
        gap: 12px;
    }
}

@media (max-width: 480px) {
    .payment-header .container {
        flex-direction: row;
    }

    .logo {
        font-size: 20px;
    }

    .payment-form-section {
        padding: 20px;
    }

    .summary-card {
        padding: 20px;
    }
}