:root {
    --bg: #f5f5f5;
    --text: #222;
    --card-bg: rgba(255, 255, 255, 0.7);
    --border: #ddd;
    --button-bg: #4a90e2;
    --button-text: #fff;
}

[data-theme="dark"] {
    --bg: #121212;
    --text: #eaeaea;
    --card-bg: rgba(30, 30, 30, 0.6);
    --border: #333;
    --button-bg: #6aa9ff;
    --button-text: #000;
}

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

body {
    margin: 0;
    font-family: "Segoe UI", sans-serif;
    background: var(--bg);
    color: var(--text);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-direction: column;
    padding: 60px 15px 20px 15px;
    min-height: 100vh;
    transition: background 0.3s, color 0.3s;
}

.container {
    width: 100%;
    max-width: 480px;
    padding: 25px;
    border-radius: 16px;
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    transition: 0.3s;
}

.upload-box {
    display: block;
    padding: 20px;
    border: 2px dashed var(--border);
    border-radius: 12px;
    text-align: center;
    cursor: pointer;
    margin-bottom: 20px;
    transition: 0.3s;
}

.upload-box.dragover {
    border-color: var(--button-bg);
    background: rgba(100, 150, 255, 0.15);
}

.upload-box input {
    display: none;
}

button {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 10px;
    background: var(--button-bg);
    color: var(--button-text);
    font-size: 16px;
    cursor: pointer;
    transition: 0.25s;
}

button:hover {
    opacity: 0.85;
}

#resultBox {
    margin-top: 20px;
    padding: 15px;
    border-radius: 12px;
    background: var(--card-bg);
    border: 1px solid var(--border);
}

.hidden {
    display: none;
}

.result-title {
    font-weight: 450;
    opacity: .8;
    background-color: #555555AA;
}

pre {
    white-space: pre-wrap;
    word-wrap: break-word;
    font-size: 14px;
}

.theme-toggle {
    position: fixed;
    top: 15px;
    right: 15px;
    font-size: 26px;
    cursor: pointer;
    user-select: none;
    transition: 0.3s;
}

.theme-toggle:hover {
    transform: scale(1.15);
}

#hashResult {
    line-height: 1.6;
    font-size: 15px;
}

.match {
    color: #00c853;
    font-weight: bold;
}

.not-match {
    color: #ff5252;
    font-weight: bold;
}

#checksumInput {
    width: 100%;
    padding: 12px 14px;
    margin: 20px auto;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--card-bg);
    color: var(--text);
    font-size: 15px;
    outline: none;
    transition: 0.25s;
    backdrop-filter: blur(12px);
}

#checksumInput::placeholder {
    color: #888;
}

#checksumInput:focus {
    border-color: var(--button-bg);
    box-shadow: 0 0 6px rgba(80, 150, 255, 0.4);
}

.input-valid {
    border-color: #75affb !important;
    box-shadow: 0 0 6px rgba(0, 200, 83, 0.4);
}

.input-invalid {
    border-color: #ff5252 !important;
    box-shadow: 0 0 6px rgba(255, 82, 82, 0.4);
}

footer{
    text-align: center;
}

footer>p{
    font-weight: bold;
    margin-top: 1rem;
}

footer>ul{
    list-style: none;
    list-style-position: inside;
    text-align: justify;
}