:root {
    --primary-orange: #FF6600;
    --primary-black: #1A1A1A;
    --primary-white: #FFFFFF;
    --light-orange: #FF944D;
    --dark-orange: #E65C00;
    --light-gray: #F5F5F5;
    --medium-gray: #E0E0E0;
    --dark-gray: #333333;
    --success-green: #28A745;
    --error-red: #DC3545;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    --radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========== RESET & BASE STYLES ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body { 
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; 
    line-height: 1.6;
    background: linear-gradient(135deg, #0A0A0A 0%, #1A1A1A 100%);
    color: var(--primary-white);
    min-height: 100vh;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* ========== DONATION CONTAINER (FIX BOOTSTRAP CONFLICT) ========== */
.donation-container {
    background: var(--primary-white); 
    padding: 40px 30px;
    border-radius: var(--radius); 
    box-shadow: var(--shadow);
    border: 3px solid var(--primary-orange);
    position: relative;
    overflow: hidden;
    max-width: 800px;
    width: 100%;
    margin: 20px auto;
    animation: fadeInUp 0.6s ease-out;
}

.donation-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 8px;
    background: linear-gradient(90deg, 
        var(--primary-orange) 0%, 
        var(--light-orange) 50%, 
        var(--primary-orange) 100%);
}

/* ========== HEADER & TYPOGRAPHY ========== */
.donation-header {
    color: var(--primary-black); 
    text-align: center; 
    margin-bottom: 25px;
    font-size: 2.4rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    position: relative;
    padding-bottom: 20px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.donation-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, transparent, var(--primary-orange), transparent);
    border-radius: 2px;
}

.intro-text {
    text-align: center;
    margin-bottom: 35px;
    color: var(--dark-gray);
    font-size: 1.15rem;
    line-height: 1.8;
    padding: 0 20px;
    font-weight: 500;
}

/* ========== FORM ELEMENTS ========== */
.form-group { 
    margin-bottom: 30px; 
}

.form-label { 
    display: block; 
    margin-bottom: 12px; 
    font-weight: 700;
    color: var(--primary-black);
    font-size: 1.2rem;
    letter-spacing: 0.5px;
}

.form-input { 
    width: 100%; 
    padding: 18px 20px; 
    border: 3px solid var(--medium-gray); 
    border-radius: 12px; 
    font-size: 17px;
    background: var(--light-gray);
    color: var(--primary-black);
    transition: var(--transition);
    font-weight: 600;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-orange);
    background: var(--primary-white);
    box-shadow: 0 0 0 4px rgba(255, 102, 0, 0.15);
    transform: translateY(-2px);
}

.form-input::placeholder {
    color: #888;
    font-weight: 500;
}

/* ========== AMOUNT SELECTION GRID ========== */
.amount-options { 
    display: grid; 
    grid-template-columns: repeat(4, 1fr); 
    gap: 20px; 
    margin-bottom: 25px;
}

.amount-btn { 
    padding: 25px 15px; 
    background: linear-gradient(145deg, var(--light-gray), #e8e8e8);
    border: 3px solid var(--medium-gray); 
    border-radius: 12px; 
    cursor: pointer; 
    text-align: center;
    font-weight: 800;
    font-size: 1.3rem;
    transition: var(--transition);
    color: var(--primary-black);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.08);
}

.amount-btn:hover { 
    background: linear-gradient(145deg, var(--light-orange), var(--primary-orange));
    border-color: var(--primary-orange);
    color: var(--primary-white);
    transform: translateY(-5px) scale(1.03);
    box-shadow: 0 8px 20px rgba(255, 102, 0, 0.25);
}

.amount-btn.active { 
    background: linear-gradient(145deg, var(--primary-orange), var(--dark-orange));
    color: var(--primary-white); 
    border-color: var(--dark-orange);
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(255, 102, 0, 0.35);
}

.amount-currency {
    font-size: 0.9rem;
    font-weight: 700;
    opacity: 0.9;
    margin-top: 8px;
    letter-spacing: 0.5px;
}

/* ========== CUSTOM AMOUNT ========== */
.custom-amount { 
    margin-top: 25px;
    animation: fadeIn 0.5s ease;
}

.custom-amount input {
    margin-top: 12px;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ========== SUBMIT BUTTON ========== */
.submit-btn { 
    background: linear-gradient(135deg, var(--primary-orange), var(--dark-orange)); 
    color: var(--primary-white); 
    padding: 22px; 
    border: none; 
    border-radius: 12px; 
    cursor: pointer; 
    width: 100%;
    font-size: 1.4rem;
    font-weight: 800;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    position: relative;
    overflow: hidden;
    margin-top: 20px;
    box-shadow: 0 6px 15px rgba(255, 102, 0, 0.3);
}

.submit-btn:hover { 
    background: linear-gradient(135deg, var(--dark-orange), #FF5500);
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(255, 102, 0, 0.4);
    letter-spacing: 2px;
}

.submit-btn:active {
    transform: translateY(-1px);
}

.submit-btn::after {
    content: '→';
    position: absolute;
    right: 25px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.8rem;
    opacity: 0.9;
    transition: var(--transition);
}

.submit-btn:hover::after {
    right: 20px;
    transform: translateY(-50%) scale(1.2);
}

/* ========== MESSAGE ALERTS ========== */
.alert-success { 
    background: linear-gradient(135deg, #d4edda, #c3e6cb); 
    color: #155724; 
    padding: 22px; 
    border-radius: var(--radius); 
    margin-bottom: 30px; 
    border-left: 6px solid var(--success-green);
    animation: slideIn 0.5s ease;
    font-weight: 600;
}

.alert-error { 
    background: linear-gradient(135deg, #f8d7da, #f5c6cb); 
    color: #721c24; 
    padding: 22px; 
    border-radius: var(--radius); 
    margin-bottom: 30px;
    border-left: 6px solid var(--error-red);
    animation: slideIn 0.5s ease;
    font-weight: 600;
}

@keyframes slideIn {
    from { transform: translateX(-30px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

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

/* ========== INFO BOX ========== */
.info-box { 
    background: linear-gradient(135deg, #fff8e1, #fff3cd); 
    color: var(--primary-black); 
    padding: 30px; 
    border-radius: var(--radius); 
    margin-top: 35px;
    border: 2px solid var(--primary-orange);
    box-shadow: 0 5px 15px rgba(255, 102, 0, 0.1);
}

.info-box strong {
    display: block;
    margin-bottom: 18px;
    font-size: 1.3rem;
    color: var(--primary-black);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.info-box ol {
    padding-left: 25px;
    margin: 18px 0;
}

.info-box li {
    margin-bottom: 15px;
    line-height: 1.7;
    color: var(--dark-gray);
    font-weight: 500;
    padding-left: 8px;
    position: relative;
}

.info-box li::before {
    content: '→';
    position: absolute;
    left: -15px;
    color: var(--primary-orange);
    font-weight: bold;
}

.info-box p {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 2px solid rgba(255, 102, 0, 0.2);
    font-weight: 700;
    color: var(--primary-orange);
    font-size: 1.1rem;
}

/* ========== RESPONSIVE BREAKPOINTS ========== */

/* Large Desktops (1200px and above) */
@media screen and (min-width: 1200px) {
    body {
        padding: 40px;
    }
    
    .donation-container {
        max-width: 850px;
        padding: 50px 40px;
    }
    
    .donation-header {
        font-size: 2.8rem;
    }
    
    .intro-text {
        font-size: 1.25rem;
    }
}

/* Tablets and Small Desktops (992px to 1199px) */
@media screen and (max-width: 1199px) {
    .donation-container {
        max-width: 90%;
        padding: 35px 25px;
    }
    
    .donation-header {
        font-size: 2.2rem;
    }
    
    .amount-options {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .amount-btn {
        min-height: 90px;
        padding: 20px;
    }
}

/* Tablets (768px to 991px) */
@media screen and (max-width: 991px) {
    body {
        padding: 15px;
    }
    
    .donation-container {
        padding: 30px;
        max-width: 95%;
    }
    
    .donation-header {
        font-size: 2rem;
        padding-bottom: 15px;
        margin-bottom: 20px;
    }
    
    .intro-text {
        font-size: 1.1rem;
        margin-bottom: 30px;
        padding: 0 10px;
    }
    
    .amount-btn {
        padding: 18px 12px;
        min-height: 85px;
        font-size: 1.2rem;
    }
    
    .submit-btn {
        padding: 20px;
        font-size: 1.3rem;
    }
    
    .submit-btn::after {
        right: 20px;
        font-size: 1.6rem;
    }
}

/* Large Mobile Phones (576px to 767px) */
@media screen and (max-width: 767px) {
    body {
        padding: 10px;
        background: var(--primary-black);
    }
    
    .donation-container {
        padding: 25px 20px;
        border-radius: 14px;
        margin: 10px auto;
        border-width: 2px;
    }
    
    .donation-header {
        font-size: 1.8rem;
        margin-bottom: 15px;
    }
    
    .intro-text {
        font-size: 1.05rem;
        margin-bottom: 25px;
        padding: 0;
    }
    
    .amount-options {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    
    .amount-btn {
        padding: 18px 10px;
        min-height: 80px;
        font-size: 1.1rem;
        border-width: 2px;
    }
    
    .form-label {
        font-size: 1.1rem;
    }
    
    .form-input {
        padding: 16px;
        font-size: 16px;
    }
    
    .submit-btn {
        padding: 18px;
        font-size: 1.2rem;
    }
    
    .submit-btn::after {
        right: 18px;
        font-size: 1.5rem;
    }
    
    .alert-success, .alert-error, .info-box {
        padding: 18px;
    }
    
    .info-box ol {
        padding-left: 20px;
    }
    
    .info-box li {
        font-size: 0.95rem;
    }
}

/* Small Mobile Phones (480px to 575px) */
@media screen and (max-width: 575px) {
    .donation-container {
        padding: 20px 16px;
        border-radius: 12px;
        margin: 8px auto;
    }
    
    .donation-header {
        font-size: 1.6rem;
        padding-bottom: 12px;
    }
    
    .intro-text {
        font-size: 1rem;
        line-height: 1.7;
    }
    
    .amount-options {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .amount-btn {
        padding: 16px;
        min-height: 75px;
        font-size: 1.1rem;
    }
    
    .submit-btn {
        padding: 16px;
        font-size: 1.1rem;
    }
    
    .info-box {
        padding: 16px;
    }
    
    .info-box strong {
        font-size: 1.1rem;
    }
}

/* Extra Small Phones (below 480px) */
@media screen and (max-width: 479px) {
    body {
        padding: 8px;
    }
    
    .donation-container {
        padding: 18px 14px;
        border-radius: 10px;
    }
    
    .donation-header {
        font-size: 1.4rem;
    }
    
    .intro-text {
        font-size: 0.95rem;
    }
    
    .amount-btn {
        padding: 14px;
        min-height: 70px;
        font-size: 1rem;
    }
    
    .form-input {
        padding: 14px;
        font-size: 15px;
    }
    
    .submit-btn {
        padding: 15px;
        font-size: 1.1rem;
    }
    
    .submit-btn::after {
        right: 15px;
        font-size: 1.4rem;
    }
    
    .info-box li {
        font-size: 0.9rem;
        margin-bottom: 12px;
    }
}

/* Landscape Orientation Fix */
@media screen and (max-height: 600px) and (orientation: landscape) {
    body {
        padding: 10px;
    }
    
    .donation-container {
        padding: 20px;
        margin: 10px auto;
    }
    
    .amount-btn {
        min-height: 70px;
        padding: 12px;
    }
}

/* High-DPI Screens */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .donation-container {
        border-width: 2.5px;
    }
    
    .form-input {
        border-width: 2.5px;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    .donation-container {
        background: #222;
    }
    
    .form-label, .donation-header {
        color: var(--primary-white);
    }
    
    .form-input {
        background: #333;
        color: var(--primary-white);
        border-color: #444;
    }
}

/* Print Styles */
@media print {
    .donation-container {
        box-shadow: none;
        border: 2px solid #000;
        max-width: 100%;
        margin: 0;
    }
    
    .submit-btn, .amount-btn {
        display: none;
    }
}