* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
    min-height: 100vh;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 40px 20px;
}

/* Punto B: container centrado */
.container {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 40px;
    max-width: 480px;
    width: 100%;
    text-align: center;
}

/* Punto A: page-container con columnas */
.page-container {
    max-width: 900px;
    width: 100%;
}

.columns {
    display: flex;
    gap: 24px;
    align-items: stretch;
}

.col {
    flex: 1;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
}

h1 {
    font-size: 22px;
    margin-bottom: 8px;
}

h2 {
    font-size: 17px;
    margin: 16px 0 10px;
}

p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 14px;
    line-height: 1.5;
}

.status {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 16px;
}

.spinner {
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    vertical-align: middle;
    margin-right: 6px;
}

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

button {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    border: none;
    padding: 14px 32px;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    transition: transform 0.2s, opacity 0.2s;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

button:hover {
    transform: translateY(-1px);
}

button:active {
    transform: scale(0.97);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.code-box {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    padding: 12px;
    margin: 12px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.code-box span {
    font-size: 22px;
    font-weight: bold;
    letter-spacing: 2px;
    font-family: monospace;
    word-break: break-all;
    text-align: left;
    flex: 1;
    min-width: 0;
}

.code-box button {
    font-size: 13px;
    padding: 8px 16px;
    flex-shrink: 0;
    min-height: 36px;
}

.code-box.reward span {
    color: #4ade80;
}

.code-box.wallet {
    flex-direction: column;
    gap: 10px;
}

.wallet-addr {
    font-size: 11px !important;
    letter-spacing: 0 !important;
    color: rgba(255, 255, 255, 0.8);
    word-break: break-all;
    line-height: 1.4;
}

.wallet-label {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.5);
}

.donation-qr {
    width: 160px;
    height: 160px;
    border-radius: 12px;
    background: #fff;
    padding: 8px;
    margin: 10px auto;
    display: block;
}

.donation-phrase {
    font-style: italic;
    color: rgba(255, 255, 255, 0.85);
    font-size: 14px;
    line-height: 1.6;
    margin: 12px 0;
    padding: 12px;
    border-left: 3px solid #667eea;
    background: rgba(102, 126, 234, 0.08);
    border-radius: 0 8px 8px 0;
    text-align: left;
}

.donation-sub {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 14px;
}

.btn-link {
    display: inline-block;
    background: linear-gradient(135deg, #f093fb, #f5576c);
    color: #fff;
    text-decoration: none;
    padding: 14px 32px;
    border-radius: 8px;
    font-size: 16px;
    margin-top: 12px;
    transition: transform 0.2s;
    -webkit-tap-highlight-color: transparent;
}

.btn-link:hover {
    transform: translateY(-1px);
}

.btn-link:active {
    transform: scale(0.97);
}

.btn-link-secondary {
    display: inline-block;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    padding: 10px 24px;
    border-radius: 8px;
    font-size: 14px;
    transition: background 0.2s;
}

.btn-link-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
}

/* TikTok button */
.tiktok-section {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.tiktok-instructions {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 12px;
    line-height: 1.5;
}

.tiktok-instructions strong {
    color: rgba(255, 255, 255, 0.9);
}

.btn-tiktok {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #000;
    color: #fff;
    text-decoration: none;
    padding: 12px 28px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    transition: transform 0.2s, background 0.2s;
    -webkit-tap-highlight-color: transparent;
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-tiktok:hover {
    transform: translateY(-1px);
    background: #1a1a1a;
}

.btn-tiktok:active {
    transform: scale(0.97);
}

.tiktok-icon {
    flex-shrink: 0;
}

input[type="text"] {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    padding: 12px;
    color: #fff;
    font-size: 24px;
    letter-spacing: 8px;
    text-align: center;
    width: 140px;
    font-family: monospace;
    outline: none;
    transition: border-color 0.2s;
    -webkit-appearance: none;
}

input[type="text"]:focus {
    border-color: #667eea;
}

input[type="text"]::placeholder {
    letter-spacing: 4px;
    color: rgba(255, 255, 255, 0.3);
}

#msg {
    margin-top: 16px;
    padding: 10px;
    border-radius: 8px;
    font-size: 13px;
}

#msg.success {
    background: rgba(74, 222, 128, 0.15);
    color: #4ade80;
    border: 1px solid rgba(74, 222, 128, 0.3);
}

#msg.error {
    background: rgba(248, 113, 113, 0.15);
    color: #f87171;
    border: 1px solid rgba(248, 113, 113, 0.3);
}

.hidden {
    display: none !important;
}

.mt-12 {
    margin-top: 12px;
}

/* Mobile: columnas apiladas */
@media (max-width: 700px) {
    body {
        padding: 20px 12px;
    }

    .columns {
        flex-direction: column;
    }

    .col {
        padding: 24px 16px;
    }

    .donation-qr {
        width: 140px;
        height: 140px;
    }

    .code-box span {
        font-size: 18px;
    }

    .wallet-addr {
        font-size: 10px !important;
    }
}

@media (max-width: 360px) {
    .container,
    .col {
        padding: 16px 10px;
    }

    button {
        padding: 12px 20px;
        font-size: 15px;
    }

    .code-box button {
        padding: 8px 12px;
        font-size: 12px;
    }
}