:root {
    --back: #111;
    --txt: #f0f0f0;
    --txt-secondary: #a0a0a0;
    --card-bg: #252525;
    --input-bg: #1e1e1e;
    --border: #444;
    --accent: #3498db;
    --accent-hover: #2980b9;
    --shadow: rgba(0, 0, 0, 0.2);
    --ui-bg: #333;
    --tab-border: #555;
}

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

body {
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--txt);
    background: var(--back);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 20px;
}

#app {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 20px;
    padding-bottom: 10px;
}

header h1 {
    font-size: 3rem;
    font-weight: 700;
    color: var(--txt);
}

header .note {
    font-size: 1.2rem;
    color: var(--txt-secondary);
}

main {
    display: flex;
    gap: 30px;
    width: 100%;
    flex-wrap: wrap;
}

.input-section,
.output-section {
    flex: 1;
    min-width: 450px;
    display: flex;
    flex-direction: column;
}

.card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 8px 25px var(--shadow);
    margin-bottom: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.input-card label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--txt);
}

.input-card textarea {
    width: 100%;
    height: 250px;
    padding: 15px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-family: "Fira Code", monospace;
    font-size: 14px;
    margin-bottom: 20px;
    resize: vertical;
    background: var(--input-bg);
    color: var(--txt);
    transition: border-color 0.3s, box-shadow 0.3s;
}

#db-name {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 16px;
    background: var(--input-bg);
    color: var(--txt);
    margin-bottom: 20px;
}

.input-card textarea:focus,
#db-name:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.3);
}

.card-footer {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    margin-top: auto;
}

#translate-btn {
    padding: 12px 25px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s ease;
}

#translate-btn:hover {
    background: var(--accent-hover);
}

.output-card {
    padding: 0;
    overflow: hidden;
}

.tab-header {
    display: flex;
    border-bottom: 1px solid var(--tab-border);
}

.tab-link {
    flex: 1;
    padding: 15px 20px;
    background: var(--ui-bg);
    color: var(--txt-secondary);
    border: none;
    border-right: 1px solid var(--tab-border);
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.3s, color 0.3s;
}

.tab-link:last-child {
    border-right: none;
}

.tab-link:hover:not(.active) {
    background: var(--border);
}

.tab-link.active {
    background: var(--card-bg);
    color: var(--txt);
    font-weight: 600;
}

.tab-content {
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.tab-pane {
    display: none;
    flex-grow: 1;
    flex-direction: column;
}

.tab-pane.active {
    display: flex;
}

.result-box {
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 15px;
    flex-grow: 1;
    overflow: auto;
    position: relative;
    min-height: 150px;
}

.result-box pre {
    font-family: "Fira Code", monospace;
    font-size: 14px;
    line-height: 1.5;
    white-space: pre-wrap;
    word-wrap: break-word;
    color: var(--txt);
    padding-right: 40px;
}

.copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 35px;
    height: 35px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    background: var(--ui-bg);
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 18px;
    transition: background 0.3s;
    z-index: 2;
}

.copy-btn:hover {
    background: var(--border);
}

.copy-tooltip {
    position: absolute;
    top: 50px;
    right: 10px;
    background: var(--ui-bg);
    color: var(--txt);
    padding: 5px 10px;
    border-radius: 5px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
    z-index: 3;
}

.copy-tooltip.visible {
    opacity: 1;
    visibility: visible;
}

.hidden {
    display: none;
}

@media (max-width: 992px) {
    main {
        flex-direction: column;
    }

    .input-section,
    .output-section {
        min-width: unset;
        width: 100%;
    }
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    header h1 {
        font-size: 2.5rem;
    }

    .card {
        padding: 20px;
    }

    .input-card textarea {
        height: 200px;
    }

    .card-footer {
        flex-direction: column;
        gap: 15px;
    }

    #translate-btn {
        width: 100%;
    }
}