:root {
    --text-color: #ffffff;
    --container-bg: rgba(255, 255, 255, 0.1);
    --container-border: 1px solid rgba(255, 255, 255, 0.2);
    --container-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --number-bg: rgba(255, 255, 255, 0.2);
    --button-bg: #ffffff;
    --button-text: #a06eff;
    --button-shadow: 0 0 20px rgba(255, 255, 255, 0.7);
    --button-hover-shadow: 0 0 30px rgba(255, 255, 255, 1);
    --button-hover-text: #ff6b99;
    --toggle-bg: rgba(255, 255, 255, 0.2);
    --toggle-border: 1px solid rgba(255, 255, 255, 0.35);
    --toggle-text: #ffffff;
    --bg-gradient: linear-gradient(45deg, #ffc796, #ff6b99, #a06eff);
}

body[data-theme='dark'] {
    --text-color: #e9ecff;
    --container-bg: rgba(20, 24, 46, 0.72);
    --container-border: 1px solid rgba(148, 163, 255, 0.18);
    --container-shadow: 0 16px 40px rgba(8, 12, 30, 0.6);
    --number-bg: rgba(148, 163, 255, 0.18);
    --button-bg: #6d7bff;
    --button-text: #0c1026;
    --button-shadow: 0 10px 25px rgba(109, 123, 255, 0.45);
    --button-hover-shadow: 0 12px 30px rgba(133, 146, 255, 0.6);
    --button-hover-text: #050814;
    --toggle-bg: rgba(109, 123, 255, 0.2);
    --toggle-border: 1px solid rgba(177, 188, 255, 0.45);
    --toggle-text: #e9ecff;
    --bg-gradient: radial-gradient(circle at top, #1b1f3a 0%, #0b0e1a 55%, #05070f 100%);
}

body {
    font-family: 'Pretendard', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: var(--bg-gradient);
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
    margin: 0;
    color: var(--text-color);
    text-align: center;
    position: relative;
    transition: background 0.6s ease, color 0.3s ease;
}

body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADIAAAAyCAMAAAAp4XiDAAAAUVBMVEWFhYWDg4N3d3dtbW17e3t1dXVvoJHr6+s/Pz8zMzNwcHBDQ0NOTk5RUVFBEBD6+vreso1ERESAgIB/f38gICAeHh4qKio8PDwMDQwAAAD3t2hsAAAAAXRSTlMAQObYZgAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAKRJREFUOI1jYObwZ+D4c/H3Z2D+z0AANEZkZgYALTc3MHMwIDYjAza3tDAgHj9gY/D/B8PsB/EMAsSo7MDFwMBgpaOgYfj/BwP/HwY/H/Y/f2B+YID//8/fH4Z/f/7/f/7/f/7//w8M/w/m/wcD+D8w/H9g/v8gA5zg/4P5/wMA5//+MwA5/P83Ayn6/wMA5+//z8A5/P8DwwsB6gIAGfMHAd2Iq3sAAAAASUVORK5CYII=');
    opacity: 0.05;
    pointer-events: none;
    z-index: -1;
}

@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.container {
    background: var(--container-bg);
    padding: 40px;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: var(--container-border);
    box-shadow: var(--container-shadow);
    max-width: 90%;
    width: 500px;
    position: relative;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 30px;
    text-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
}

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

.lotto-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--number-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--text-color);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
}

.generate-button {
    padding: 15px 30px;
    border: none;
    border-radius: 50px;
    background: var(--button-bg);
    color: var(--button-text);
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--button-shadow);
}

.generate-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--button-hover-shadow);
    color: var(--button-hover-text);
}

.theme-toggle {
    position: absolute;
    top: 18px;
    right: 18px;
    padding: 8px 14px;
    border-radius: 999px;
    border: var(--toggle-border);
    background: var(--toggle-bg);
    color: var(--toggle-text);
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, opacity 0.2s ease;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

.theme-toggle:hover {
    transform: translateY(-1px);
    opacity: 0.95;
}

.theme-toggle:focus-visible {
    outline: 2px solid rgba(255, 255, 255, 0.7);
    outline-offset: 2px;
}

.inquiry-section {
    margin-top: 36px;
    padding-top: 28px;
    border-top: 1px solid rgba(255, 255, 255, 0.18);
    text-align: left;
}

.inquiry-title {
    font-size: 1.4rem;
    margin: 0 0 8px;
}

.inquiry-description {
    margin: 0 0 18px;
    opacity: 0.9;
}

.inquiry-form {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.form-label {
    font-weight: 600;
    margin-top: 6px;
}

.form-input,
.form-textarea {
    width: 100%;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.25);
    background: rgba(255, 255, 255, 0.12);
    color: var(--text-color);
    padding: 12px 14px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    box-sizing: border-box;
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: rgba(255, 255, 255, 0.65);
}

.form-input:focus,
.form-textarea:focus {
    border-color: rgba(255, 255, 255, 0.7);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.18);
}

.form-textarea {
    resize: vertical;
    min-height: 110px;
}

.inquiry-submit {
    margin-top: 10px;
    padding: 13px 18px;
    border: none;
    border-radius: 999px;
    background: var(--button-bg);
    color: var(--button-text);
    font-size: 1.05rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow: var(--button-shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease, color 0.2s ease;
    align-self: flex-start;
}

.inquiry-submit:hover {
    transform: translateY(-2px);
    box-shadow: var(--button-hover-shadow);
    color: var(--button-hover-text);
}

.inquiry-submit:focus-visible {
    outline: 2px solid rgba(255, 255, 255, 0.8);
    outline-offset: 3px;
}

@media (max-width: 600px) {
    .container {
        padding: 20px;
    }

    h1 {
        font-size: 2rem;
        padding-top: 16px;
    }

    .lotto-number {
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
    }

    .generate-button {
        font-size: 1rem;
    }

    .theme-toggle {
        top: 12px;
        right: 12px;
        padding: 7px 12px;
        font-size: 0.9rem;
    }

    .inquiry-section {
        margin-top: 28px;
        padding-top: 22px;
    }

    .inquiry-submit {
        width: 100%;
        align-self: stretch;
    }
}