@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap');

:root {
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --accent-color: #4cc9f0;
    --text-color: #333;
    --text-light: #666;
    --bg-color: #f4f7fc;
    --paper-color: #ffffff;
    --tablet-color-1: #3a86ff;
    --tablet-color-2: #ff006e;
    --tablet-color-3: #fb5607;
    --tablet-color-4: #8338ec;
    --tablet-color-5: #3a5a40;
    --paper-border: #dee2e6;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --card-bg: #ffffff;
    --input-border: #ced4da;
    --input-focus-border: #8cb3ff;
    --danger-color: #e63946;
    --success-color: #2a9d8f;
    --info-color: #457b9d;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Roboto', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 30px 15px;
}

.container {
    width: 100%;
    max-width: 1400px;
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 25px 30px;
    text-align: center;
}

.header h1 {
    font-size: 2.2rem;
    margin-bottom: 8px;
    font-weight: 700;
}

.header p {
    font-size: 1rem;
    opacity: 0.9;
}

.content {
    display: flex;
    flex-direction: column;
    padding: 25px;
}

@media (min-width: 992px) {
    .content {
        flex-direction: row;
        gap: 25px;
    }
}

.input-section {
    flex: 1;
    min-width: 300px;
    max-width: 400px;
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 8px;
    border: 1px solid var(--paper-border);
}

.input-group {
    margin-bottom: 18px;
}

label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--secondary-color);
}

input[type="text"], input[type="number"] {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--input-border);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}

input[type="text"]:focus, input[type="number"]:focus {
    border-color: var(--input-focus-border);
    outline: 0;
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.15);
}

.button-group {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
}

.button-group button {
    width: 50%;
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 18px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    width: 100%;
    transition: background-color 0.2s ease, transform 0.1s ease;
    text-align: center;
}

button:hover {
    background-color: var(--secondary-color);
    transform: translateY(-1px);
}

button:active {
    transform: translateY(0px);
}

.preset-section, .saved-tablets-section {
    margin-top: 25px;
}

.preset-section h3, .saved-tablets-section h3 {
    margin-bottom: 12px;
    color: var(--text-color);
    font-size: 1.1rem;
    border-bottom: 1px solid var(--paper-border);
    padding-bottom: 5px;
}

.preset-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
    gap: 8px;
}

.preset {
    background-color: var(--accent-color);
    font-size: 0.85rem;
    padding: 8px 10px;
}

.preset:hover {
    background-color: #35b4d4;
}

.saved-tablets-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 250px;
    overflow-y: auto;
    padding-right: 5px;
}

.saved-tablets-list::-webkit-scrollbar {
    width: 6px;
}

.saved-tablets-list::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 3px;
}

.saved-tablets-list::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 3px;
}

.saved-tablets-list::-webkit-scrollbar-thumb:hover {
    background: #aaa;
}

.saved-tablet-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background-color: #fff;
    border: 1px solid var(--paper-border);
    border-radius: 6px;
    cursor: default;
    transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

.saved-tablet-item:hover {
    background-color: #f8f9fa;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.saved-tablet-info {
    flex-grow: 1;
    margin-right: 10px;
    cursor: pointer;
}

.saved-tablet-name {
    font-weight: 500;
    display: block;
    margin-bottom: 2px;
    font-size: 0.9rem;
}

.saved-tablet-dimensions {
    font-size: 0.75rem;
    color: var(--text-light);
}

.saved-tablet-actions {
    display: flex;
    gap: 5px;
    align-items: center;
}

.tablet-action-btn {
    background-color: transparent;
    color: var(--primary-color);
    width: auto;
    height: auto;
    padding: 4px 6px;
    font-size: 0.8rem;
    border: 1px solid transparent;
    border-radius: 4px;
}

.tablet-action-btn:hover {
    background-color: rgba(67, 97, 238, 0.1);
    border-color: rgba(67, 97, 238, 0.2);
    color: var(--secondary-color);
}

.delete-btn {
    color: var(--danger-color);
    font-weight: bold;
    font-size: 1rem;
    padding: 2px 6px;
}

.delete-btn:hover {
    background-color: rgba(230, 57, 70, 0.1);
    border-color: rgba(230, 57, 70, 0.2);
    color: #a01c26;
}

.no-saved-message {
    color: var(--text-light);
    font-style: italic;
    padding: 10px;
    text-align: center;
}

.comparison-section {
    flex: 3;
    display: flex;
    flex-direction: column;
    gap: 15px;
    min-height: 500px;
}

.comparison-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--paper-border);
}

.comparison-header h2 {
    font-size: 1.3rem;
    color: var(--text-color);
}

.clear-btn {
    background-color: var(--danger-color);
    color: white;
    padding: 6px 12px;
    font-size: 0.85rem;
    width: auto;
}

.clear-btn:hover {
    background-color: #c12b38;
}

.comparison-container {
    position: relative;
    flex-grow: 1;
    min-height: 350px;
    background-color: #f0f4f8;
    border-radius: 8px;
    display: flex;
    gap: 20px;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    padding: 20px;
    overflow: hidden;
    border: 1px solid var(--paper-border);
}

.a4-paper, .tablet-display {
    background-color: var(--paper-color);
    box-shadow: var(--shadow);
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 4px;
    transition: width 0.5s ease, height 0.5s ease, opacity 0.3s ease, transform 0.3s ease;
    flex-shrink: 0;
}

.a4-paper {
    border: 1px dashed var(--paper-border);
    background-color: #fff;
    z-index: 1;
}

.tablet-display {
    opacity: 0.95;
    z-index: 2;
    color: white;
    position: relative;
    border: 1px solid rgba(0, 0, 0, 0.1);
    transform-origin: center center;
}

.paper-label, .tablet-label {
    font-size: clamp(8px, 1.5vw, 12px);
    text-align: center;
    pointer-events: none;
    font-weight: 500;
    padding: 5px;
    word-break: break-word;
    line-height: 1.2;
    position: relative;
    z-index: 1;
}

.paper-label {
    color: var(--text-light);
}

.remove-tablet-btn {
    position: absolute;
    top: 3px;
    right: 3px;
    background-color: rgba(0, 0, 0, 0.3);
    color: white;
    border: none;
    border-radius: 50%;
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    line-height: 1;
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.2s ease, background-color 0.2s ease;
    z-index: 5;
}

.remove-tablet-btn:hover {
    opacity: 1;
    background-color: var(--danger-color);
}

.rotate-tablet-btn {
    position: absolute;
    bottom: 3px;
    right: 3px;
    background-color: rgba(0, 0, 0, 0.3);
    color: white;
    border: none;
    border-radius: 50%;
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    line-height: 1;
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.2s ease, background-color 0.2s ease;
    z-index: 5;
    padding: 0;
    font-weight: bold;
}

.rotate-tablet-btn:hover {
    opacity: 1;
    background-color: var(--accent-color);
}

.dimension-info {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 15px;
    justify-content: center;
}

.info-box {
    background-color: #fff;
    padding: 15px;
    border-radius: 6px;
    border-left: 5px solid var(--paper-border);
    box-shadow: 0 2px 6px rgba(0,0,0,0.06);
    flex: 1 1 200px;
    min-width: 180px;
    transition: border-color 0.3s ease;
}

.info-box h3 {
    margin-bottom: 10px;
    font-size: 1rem;
    color: var(--text-color);
    font-weight: 500;
}

.info-box p {
    font-size: 0.85rem;
    line-height: 1.5;
    color: var(--text-light);
    margin-bottom: 4px;
}

.info-box p:last-child {
    margin-bottom: 0;
}

.size-comparison {
    font-weight: 500;
    margin-top: 8px !important;
}

.a4-info {
    border-left-color: var(--paper-border);
}

.tablet-info {
    /* Border color is set via inline style in JS */
}