body {
    background-color: #f8fafc;
}
.ppt-container {
    max-width: 900px;
    margin: 40px auto;
    padding: 0 20px;
}
.alert {
    padding: 1rem 1.25rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    font-weight: 500;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}
.alert.success {
    background-color: #ecfdf5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}
.alert.error {
    background-color: #fef2f2;
    color: #991b1b;
    border: 1px solid #fca5a5;
}

.profile-card {
    background: white;
    padding: 25px;
    border-radius: 16px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 10px 15px -3px rgba(0, 0, 0, 0.03);
    border: 1px solid #f1f5f9;
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 30px;
    border-left: 6px solid #d97706;
}

.profile-avatar {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, #d97706 0%, #b45309 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 800;
    box-shadow: 0 4px 12px rgba(217, 119, 6, 0.2);
}

.profile-info h2 {
    margin: 0;
    font-size: 1.35rem;
    color: #1e293b;
    font-weight: 700;
}

.profile-info p {
    margin: 4px 0 0;
    color: #64748b;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 6px;
}

.form-card-premium {
    background: white;
    border-radius: 16px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 10px 15px -3px rgba(0, 0, 0, 0.03);
    border: 1px solid #f1f5f9;
    overflow: hidden;
}

.form-header-premium {
    padding: 25px 30px;
    background: linear-gradient(135deg, #d97706 0%, #b45309 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.form-header-premium h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.form-body-premium {
    padding: 30px;
}

.form-row-premium {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.input-group-premium {
    display: flex;
    flex-direction: column;
}

.input-group-premium label {
    font-size: 0.85rem;
    font-weight: 600;
    color: #334155;
    margin-bottom: 8px;
}

.input-with-icon-premium {
    position: relative;
    display: flex;
    align-items: center;
}

.input-with-icon-premium i {
    position: absolute;
    left: 14px;
    color: #94a3b8;
    font-size: 1rem;
    pointer-events: none;
    z-index: 2;
}

.input-with-icon-premium input,
.input-with-icon-premium select,
.input-with-icon-premium textarea {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 40px;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    font-size: 0.9rem;
    color: #1e293b;
    background-color: #f8fafc;
    transition: all 0.25s ease;
    outline: none;
}

.input-with-icon-premium input:focus,
.input-with-icon-premium select:focus,
.input-with-icon-premium textarea:focus {
    border-color: #d97706;
    background-color: #ffffff;
    box-shadow: 0 0 0 4px rgba(217, 119, 6, 0.15);
}

.input-with-icon-premium textarea {
    min-height: 100px;
    resize: vertical;
    padding-left: 40px;
}

/* Modern Upload Zone */
.file-drop-zone {
    border: 2px dashed #cbd5e1;
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    background: #f8fafc;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.file-drop-zone:hover {
    border-color: #d97706;
    background: #fffbeb;
}

.file-drop-zone input[type="file"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.file-drop-icon {
    font-size: 2.5rem;
    color: #d97706;
    margin-bottom: 10px;
}

.file-drop-title {
    font-weight: 600;
    color: #334155;
    font-size: 0.95rem;
    margin-bottom: 4px;
}

.file-drop-subtitle {
    font-size: 0.8rem;
    color: #94a3b8;
}

.file-info-badge {
    margin-top: 15px;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: #ffffff;
    padding: 8px 14px;
    border-radius: 8px;
    border: 1px solid #e2e8f0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    font-size: 0.85rem;
    color: #1e293b;
}

.btn-submit-premium {
    background: linear-gradient(135deg, #d97706 0%, #b45309 100%);
    color: white;
    border: none;
    width: 100%;
    padding: 1rem;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(217, 119, 6, 0.25);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-submit-premium:hover {
    background: linear-gradient(135deg, #b45309 0%, #92400e 100%);
    box-shadow: 0 6px 16px rgba(217, 119, 6, 0.35);
    transform: translateY(-1px);
}

/* Responsive File Size Modal */
.file-size-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.65);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 99999;
    padding: 16px;
    opacity: 0;
    transition: opacity 0.25s ease;
}
.file-size-modal-overlay.active {
    display: flex;
    opacity: 1;
}
.file-size-modal-card {
    background: #ffffff;
    width: 100%;
    max-width: 440px;
    border-radius: 20px;
    padding: 28px 24px 24px;
    text-align: center;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    position: relative;
    transform: scale(0.92);
    transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
    border: 1px solid #f1f5f9;
}
.file-size-modal-overlay.active .file-size-modal-card {
    transform: scale(1);
}
.file-size-modal-close {
    position: absolute;
    top: 14px;
    right: 16px;
    background: #f1f5f9;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    font-size: 1.25rem;
    color: #64748b;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}
.file-size-modal-close:hover {
    background: #e2e8f0;
    color: #0f172a;
}
.file-size-modal-icon {
    width: 64px;
    height: 64px;
    background: #fef2f2;
    color: #dc2626;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin: 0 auto 16px;
    border: 2px solid #fee2e2;
}
.file-size-modal-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: #0f172a;
    margin: 0 0 8px;
}
.file-size-modal-message {
    font-size: 0.925rem;
    color: #475569;
    margin: 0 0 16px;
    line-height: 1.5;
}
.file-size-modal-details {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 12px 16px;
    margin-bottom: 20px;
    font-size: 0.85rem;
    color: #334155;
    text-align: left;
}
.file-size-modal-details div {
    display: flex;
    justify-content: space-between;
    margin-bottom: 6px;
}
.file-size-modal-details div:last-child {
    margin-bottom: 0;
}
.file-size-modal-details .detail-label {
    color: #64748b;
}
.file-size-modal-details .detail-value {
    font-weight: 600;
}
.file-size-modal-details .detail-value.exceeded {
    color: #dc2626;
}
.file-size-modal-btn {
    width: 100%;
    background: #dc2626;
    color: #ffffff;
    border: none;
    padding: 12px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.1s ease;
}
.file-size-modal-btn:hover {
    background: #b91c1c;
}
.file-size-modal-btn:active {
    transform: scale(0.98);
}
@media (max-width: 480px) {
    .file-size-modal-card {
        padding: 24px 18px 20px;
        border-radius: 16px;
    }
    .file-size-modal-title {
        font-size: 1.15rem;
    }
    .file-size-modal-message {
        font-size: 0.875rem;
    }
}