:root {
    color-scheme: light dark;
    --bg: #f4f6ff;
    --fg: #111b3a;
    --accent-blue: #2563eb;
    --accent-red: #dc2626;
    --accent: var(--accent-blue);
    --accent-contrast: #ffffff;
    --accent-gradient: linear-gradient(135deg, var(--accent-blue), var(--accent-red));
    --border: #d4ddf5;
    --card-bg: #ffffff;
    --muted: #4b5d84;
    --success: #16a34a;
    --error: #b91c1c;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0b1120;
        --fg: #e2e8f0;
        --accent-blue: #3b82f6;
        --accent-red: #f87171;
        --accent: var(--accent-blue);
        --accent-contrast: #fdf2f8;
        --accent-gradient: linear-gradient(135deg, rgba(59, 130, 246, 0.95), rgba(248, 113, 113, 0.95));
        --border: #1e293b;
        --card-bg: #111c33;
        --muted: #94a3b8;
        --success: #22c55e;
        --error: #ef4444;
    }
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Inter', 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--fg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: min(1100px, 92vw);
    margin: 0 auto;
}

.site-header {
    background-image: var(--accent-gradient);
    border-bottom: 1px solid rgba(255, 255, 255, 0.25);
    position: sticky;
    top: 0;
    z-index: 20;
    color: var(--accent-contrast);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
   /* padding: 1.25rem 0;*/
}

.branding {
    display: flex;
    align-items: center;
}

.branding-logo {
    width: 156px;
    object-fit: contain;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 1rem;
    margin: 0;
    padding: 0;
}

nav a {
    color: var(--accent-contrast);
    text-decoration: none;
    font-weight: 600;
}

nav a:hover,
nav a:focus {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: underline;
}

.language-switcher {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--accent-contrast);
}

.language-switcher select {
    padding: 0.35rem 0.6rem;
    border-radius: 0.75rem;
    border: 1px solid rgba(255, 255, 255, 0.4);
    background: rgba(255, 255, 255, 0);
    color: var(--accent-contrast);
    backdrop-filter: blur(6px);
}

.main-content {
    flex: 1;
    display: grid;
    gap: 2rem;
    padding: 2.5rem 0 3.5rem;
}

.card {
    background: var(--card-bg);
    border-radius: 1.25rem;
    border: 1px solid var(--border);
    padding: 1.75rem;
    box-shadow: 0 18px 45px rgba(30, 64, 175, 0.03);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.card-header h2 {
    margin: 0;
    font-size: 1.6rem;
}

.card-header p {
    margin: 0.35rem 0 0;
    color: var(--muted);
}

textarea {
    width: 100%;
    border-radius: 1rem;
    border: 1px solid var(--border);
    padding: 1rem;
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
    min-height: 120px;
    background: var(--bg);
    color: var(--fg);
}

textarea:focus {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

.button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

button {
    padding: 0.65rem 1.3rem;
    border-radius: 1rem;
    border: none;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.15s ease, filter 0.15s ease;
}

button.primary {
    background-image: var(--accent-gradient);
    color: var(--accent-contrast);
    box-shadow: 0 10px 20px rgba(37, 99, 235, 0.25);
}

button.secondary {
    background: transparent;
    color: var(--fg);
    border: 1px solid rgba(37, 99, 235, 0.35);
}
 
button:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    transform: none !important;
}

button:not(:disabled):hover,
button:not(:disabled):focus {
    transform: translateY(-1px);
    filter: brightness(1.05);
}

.qr-output {
    min-height: 220px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px dashed var(--border);
    border-radius: 1.25rem;
    padding: 1rem;
    background: var(--bg);
}

.qr-output canvas {
    width: 220px;
    height: 220px;
}

.scan-controls {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.camera-controls,
.upload-controls {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.upload-label {
    font-weight: 600;
}

input[type="file"] {
    font-size: 0.9rem;
}

.scan-visuals {
    display: grid;
    gap: 1rem;
}

video {
    width: 100%;
    max-height: 320px;
    border-radius: 1rem;
    border: 1px solid var(--border);
    background: #000;
    display: none;
}

video.active {
    display: block;
}

.scan-result-card {
    border-radius: 1.25rem;
    border: 1px solid rgba(37, 99, 235, 0.25);
    padding: 1rem;
    background: var(--bg);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.status-line {
    font-size: 0.95rem;
    color: var(--muted);
}

.result-line {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.scan-result-link {
    display: none;
    align-items: center;
    gap: 0.5rem;
    padding: 0.9rem 1rem;
    border-radius: 1rem;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--accent-blue);
    font-weight: 600;
    text-decoration: none;
    word-break: break-word;
    box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.08);
}

.scan-result-link:focus,
.scan-result-link:hover {
    text-decoration: underline;
}

.scan-result-link[hidden] {
    display: none !important;
}

.scan-result-link:not([hidden]) {
    display: inline-flex;
    width: 100%;
}

.scan-result-hidden {
    display: none !important;
}

.site-footer {
    background-image: var(--accent-gradient);
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    padding: 1.5rem 0;
    margin-top: auto;
}

.site-footer p {
    margin: 0;
    text-align: center;
    color: rgba(255, 255, 255, 0.85);
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        align-items: flex-start;
    }

    .branding {
        align-items: flex-start;
    }

    .branding-logo {
      /*  width: 98px;
        height: 98px;*/
    }

    nav ul {
        gap: 0.65rem;
    }

    .button-row {
        width: 100%;
    }

    button {
        flex: 1;
    }
}

/* Modal de donación */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal[hidden] {
    display: none;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--card-bg);
    border-radius: 1.25rem;
    padding: 2rem;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
    z-index: 1001;
    animation: modalFadeIn 0.3s ease-out;
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: transparent;
    border: none;
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    color: var(--muted);
    padding: 0.25rem 0.5rem;
    transition: color 0.2s ease;
}

.modal-close:hover {
    color: var(--fg);
}

.modal-body {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    text-align: center;
}

.donate-image {
    max-width: 100%;
    height: auto;
    border-radius: 0.75rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.donate-text {
    font-size: 1.1rem;
    line-height: 1.6;
    color: var(--fg);
    margin: 0;
}

@media (max-width: 600px) {
    .modal-content {
        padding: 1.5rem;
        max-width: 95%;
    }

    .donate-text {
        font-size: 1rem;
    }
}