@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@400;700&display=swap');

body {
    font-family: 'Noto Sans KR', sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px 0;
    transition: background 0.3s ease, color 0.3s ease;
}

:root {
    --bg-gradient-start: #f0f2f5;
    --bg-gradient-end: #e2e8ed;
    --text-color: #333;
    --container-bg: rgba(255, 255, 255, 0.9);
    --h1-color: #2c3e50;
    --button-bg-start: #3498db;
    --button-bg-end: #2980b9;
    --button-hover-bg-start: #2980b9;
    --button-hover-bg-end: #2575a6;
    --number-shadow: rgba(0, 0, 0, 0.2);
    --container-shadow: rgba(0, 0, 0, 0.1), 0 6px 6px rgba(0, 0, 0, 0.05);
}

body.dark {
    --bg-gradient-start: #2c3e50;
    --bg-gradient-end: #1a252f;
    --text-color: #ecf0f1;
    --container-bg: rgba(52, 73, 94, 0.9);
    --h1-color: #ecf0f1;
    --button-bg-start: #5dade2;
    --button-bg-end: #348fc7;
    --button-hover-bg-start: #348fc7;
    --button-hover-bg-end: #2c7bb1;
    --number-shadow: rgba(0, 0, 0, 0.4);
    --container-shadow: rgba(0, 0, 0, 0.3), 0 6px 6px rgba(0, 0, 0, 0.15);
}

.theme-switch-wrapper {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    align-items: center;
    z-index: 10;
}

.theme-switch {
    display: inline-block;
    height: 34px;
    position: relative;
    width: 60px;
}

.theme-switch input {
    display: none;
}

.slider {
    background-color: #ccc;
    bottom: 0;
    cursor: pointer;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    background-color: white;
    bottom: 4px;
    content: "";
    height: 26px;
    left: 4px;
    position: absolute;
    transition: .4s;
    width: 26px;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: #2196F3;
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.container {
    background-color: var(--container-bg);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--container-shadow);
    text-align: center;
    width: 90%;
    max-width: 500px;
    margin-bottom: 20px;
    backdrop-filter: blur(5px);
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--h1-color);
    margin-bottom: 30px;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.lotto-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.8rem;
    font-weight: 700;
    color: white;
    box-shadow: 0 4px 10px var(--number-shadow);
    transition: transform 0.3s ease, background 0.3s ease;
    transform-style: preserve-3d;
    background: radial-gradient(circle, var(--number-color-light) 0%, var(--number-color-dark) 100%);
    position: relative;
    overflow: hidden;
}

.lotto-number::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, rgba(255,255,255,0) 50%, rgba(0,0,0,0.1) 100%);
    border-radius: 50%;
    z-index: 1;
}


.lotto-number:hover {
    transform: translateY(-5px) scale(1.08);
    box-shadow: 0 6px 15px var(--number-shadow);
}

.draw-button {
    background: linear-gradient(135deg, var(--button-bg-start), var(--button-bg-end));
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1.2rem;
    font-weight: 700;
    border-radius: 50px;
    cursor: pointer;
    transition: background 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.4);
    position: relative;
    overflow: hidden;
}

.draw-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.1);
    transform: translateX(-100%) skewX(-30deg);
    transition: transform 0.3s ease;
}

.draw-button:hover::before {
    transform: translateX(100%) skewX(-30deg);
}

.draw-button:hover {
    background: linear-gradient(135deg, var(--button-hover-bg-start), var(--button-hover-bg-end));
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.6);
}

.draw-button:active {
    transform: translateY(0px);
    box-shadow: 0 2px 10px rgba(52, 152, 219, 0.4);
}

.clear-history-button {
    background-color: #e74c3c;
    color: white;
    border: none;
    padding: 8px 15px;
    font-size: 0.9rem;
    font-weight: 700;
    border-radius: 25px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    margin-top: -10px;
    margin-bottom: 20px;
}

.clear-history-button:hover {
    background-color: #c0392b;
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgba(231, 76, 60, 0.4);
}

.clear-history-button:active {
    transform: translateY(0px);
    box-shadow: 0 2px 5px rgba(231, 76, 60, 0.3);
}

.history-container {
    background-color: var(--container-bg);
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--container-shadow);
    width: 90%;
    max-width: 500px;
    text-align: center;
    backdrop-filter: blur(5px);
}

.history-container h2 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--h1-color);
    margin-bottom: 20px;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
}

.history-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.history-item {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 10px;
    padding: 10px;
    border-radius: 10px;
    background-color: rgba(0,0,0,0.05);
    animation: fadeIn 0.5s ease-out;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.history-numbers {
    display: flex;
    gap: 10px;
}

.history-number {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1rem;
    font-weight: 700;
    color: white;
    background: radial-gradient(circle, var(--number-color-light) 0%, var(--number-color-dark) 100%);
    box-shadow: 0 2px 5px var(--number-shadow);
    position: relative;
    overflow: hidden;
}

.history-number::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, rgba(255,255,255,0) 50%, rgba(0,0,0,0.05) 100%);
    border-radius: 50%;
    z-index: 1;
}

/* Mobile responsiveness */
@media (max-width: 480px) {
    body {
        padding: 10px 0;
    }

    .container {
        padding: 25px;
        margin-bottom: 15px;
    }

    h1 {
        font-size: 2.2rem;
        margin-bottom: 25px;
    }

    .lotto-numbers {
        gap: 8px;
        margin-bottom: 30px;
    }

    .lotto-number {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }

    .draw-button {
        padding: 12px 25px;
        font-size: 1rem;
    }

    .history-container {
        padding: 15px;
    }

    .history-container h2 {
        font-size: 1.6rem;
        margin-bottom: 15px;
    }

    .clear-history-button {
        padding: 6px 12px;
        font-size: 0.8rem;
        margin-bottom: 15px;
    }
}

@media (max-width: 375px) { /* iPhone SE, etc. */
    .container {
        padding: 20px;
    }

    h1 {
        font-size: 2rem;
        margin-bottom: 20px;
    }

    .lotto-numbers {
        gap: 6px;
        margin-bottom: 25px;
    }

    .lotto-number {
        width: 38px;
        height: 38px;
        font-size: 1.1rem;
    }

    .draw-button {
        padding: 10px 20px;
        font-size: 0.9rem;
    }

    .history-item {
        padding: 8px;
    }

    .history-number {
        width: 26px;
        height: 26px;
        font-size: 0.9rem;
    }
}