:root {
    --primary: #0288d1; /* Темно-голубой для лучшего контраста с белым текстом */
    --primary-dark: #01579b;
    --bg: #ffffff;
    --text: #000000;
}

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

body {
    background-color: var(--bg);
    color: var(--text);
    overflow-x: hidden;
}

/* Шапка */
header {
    background-color: var(--primary);
    display: flex;
    justify-content: space-between;
    padding: 0 20px;
    height: 60px;
    align-items: center;
}

.nav-link {
    color: #ffffff;
    text-decoration: none;
    font-size: 16px;
    font-weight: bold;
    padding: 18px 10px;
    margin-right: 10px;
    border-bottom: 3px solid transparent;
    transition: border-color 0.2s;
}

.nav-link.active {
    border-bottom: 3px solid #ffffff;
}

/* Страницы */
.page {
    display: none;
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.page.active {
    display: block;
}

/* Сетка подписей */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.signature-card {
    border: 2px solid var(--primary);
    border-radius: 12px;
    padding: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.signature-card img {
    width: 100%;
    height: auto;
    background: #fff;
}

.card-divider {
    width: 100%;
    height: 1px;
    background-color: rgba(79, 195, 247, 0.3);
    margin: 10px 0;
}

.card-nick {
    font-weight: bold;
    font-size: 16px;
    color: var(--text);
}

.card-nick.author {
    color: var(--primary);
}

/* Форма рисования */
.draw-container {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

#nickname {
    padding: 10px;
    border: 2px solid var(--primary);
    border-radius: 8px;
    font-size: 16px;
    outline: none;
}

.canvas-wrapper {
    border: 2px solid var(--primary);
    border-radius: 8px;
    overflow: hidden;
}

canvas {
    background-color: #ffffff;
    display: block;
    width: 100%;
    height: 300px;
    touch-action: none; /* Важно для рисования на телефоне без скролла экрана */
}

.controls {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: space-between;
}

/* Кнопки */
.btn {
    background-color: var(--primary);
    color: #fff;
    border: none;
    padding: 10px 15px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    flex: 1;
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

/* Модальные окна */
.modal {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: #fff;
    padding: 20px;
    border-radius: 12px;
    border: 2px solid var(--primary);
    max-width: 400px;
    width: 90%;
    text-align: center;
}

.modal-content h2 { margin-bottom: 10px; color: var(--primary); }
.modal-content p { margin-bottom: 20px; line-height: 1.5; }
.modal-content input {
    width: 100%; padding: 10px; margin-bottom: 15px;
    border: 2px solid var(--primary); border-radius: 8px;
}
@media (max-width: 600px) {
    header {
        padding: 0 5px;
        height: auto;
        min-height: 60px;
        align-items: stretch; 
    }
    .nav-left, .nav-right {
        display: flex;
        align-items: stretch; 
    }
    .nav-link {
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 10px 5px;
        margin-right: 0;
        font-size: 13px;
        text-align: center;
    }
}