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

body {
    background: #1e1f22;
    color: #f0f0f0;
    font-family: Arial,
        sans-serif;
    min-height: 100vh;
}

.container {
    width: 90%;
    max-width: 900px;
    margin: auto;
    padding: 40px 20px;
}

h1 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 40px;
}

.subtitle {
    text-align: center;
    color: #a9adb8;
    margin-bottom: 40px;
}

.cards {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.card {
    background: #2b2d31;
    border: 1px solid #3a3d44;
    border-radius: 16px;
    padding: 30px;
    width: 280px;
    text-decoration: none;
    color: white;
    transition: 0.3s ease;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
}

.card:hover {
    transform:
        translateY(-5px);
    border-color: #6c7cff;
}

.card h2 {
    margin-bottom: 10px;
}

.back-btn,
.reset-btn,
.hint-btn {
    border:
        none;
    cursor: pointer;
    transition: 0.3s ease;
}

.back-btn {
    background: #3b82f6;
    color: white;
    padding: 12px 20px;
    border-radius: 10px;
    text-decoration: none;
    display: inline-block;
    margin-bottom: 25px;
}

.back-btn:hover {
    background:
        #2563eb;
}

.checklist {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.item {
    background: #2b2d31;
    border: 1px solid #3a3d44;
    border-radius: 14px;
    padding: 18px;
}

.item-top {
    display: flex;
    align-items: center;
    justify-content:
        space-between;
    gap: 10px;
}

.item label {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 18px;
}

input[type="checkbox"] {
    width: 18px;
    height: 18px;
}

.hint-btn {
    background: #444857;
    color: white;
    padding: 8px 14px;
    border-radius: 8px;
}

.hint-btn:hover {
    background: #5a6073;
}

.hint {
    max-height: 0;
    overflow: hidden;
    transition:
        max-height 0.4s ease, margin-top 0.4s ease;
    margin-top: 0;
}

.hint.active {
    max-height: 100%;
    margin-top: 18px;
}

.hint-content {
    background: #202226;
    padding: 16px;
    border-radius: 10px;
    border: 1px solid #383c45;
}

.hint-content p {
    margin-bottom: 14px;
    color: #d4d4d4;
}

pre {
    background: #111317;
    color: #7ee787;
    padding: 12px;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 14px;
}

.hint-content img {
    width: 100%;
    border-radius: 10px;
    border: 1px solid #444;
    cursor: zoom-in;
}

.reset-btn {
    margin-top: 30px;
    background: #ef4444;
    color: white;
    padding: 14px 24px;
    border-radius:
        10px;
    font-size: 16px;
}

.reset-btn:hover {
    background: #dc2626;
}

.image-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.92);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    animation:
        fadeIn 0.3s ease;
    cursor: zoom-out;
    padding: 20px;
}

.image-overlay img {
    max-width: 95%;
    max-height: 95%;
    object-fit:
        contain;
    border-radius: 12px;
    animation: zoomIn 0.3s ease;
}

@media (orientation: landscape) and (max-height: 600px) {
    .image-overlay img {
        max-height: 98vh;
        max-width: 98vw;
    }
}

.image-overlay.hide {
    animation: fadeOut 0.3s ease forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
    }

    to {
        opacity:
            0;
    }
}

@keyframes zoomIn {
    from {
        transform: scale(0.9);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

.upload-box {
  border: 2px dashed #4b5563;
  border-radius: 16px;
  padding: 50px 20px;
  text-align: center;
  cursor: pointer;
  background: #2b2d31;
  transition: 0.3s ease;
}

.upload-box:hover {
  border-color: #6c7cff;
}

.upload-box.dragover {
  border-color: #3b82f6;
  background: #32353b;
}

.upload-box p {
  color: #d1d5db;
  font-size: 18px;
}

.buttons {
  display: flex;
  gap: 15px;
  margin-top: 25px;
}

#results {
  margin-top: 30px;
}

.result-item {
  background: #2b2d31;
  border: 1px solid #3a3d44;
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 12px;
}

.result-error {
  border-left: 5px solid #ef4444;
}

.result-success {
  border-left: 5px solid #22c55e;
}