:root {
    --bg-color: #f0f2f5;
    --text-color: #333;
    --container-bg: #ffffff;
    --border-color: #e0e0e0;
    --button-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --button-text: #fff;
    --number-bg: #f8f9fa;
    --number-text-color: #555;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --icon-color: #ffc107;
}

body.dark-mode {
    --bg-color: #1a1a2e;
    --text-color: #e0e0e0;
    --container-bg: #1f1f3a;
    --border-color: #3b3b58;
    --button-bg: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
    --number-bg: #2a2a4a;
    --number-text-color: #f0f0f0;
    --shadow-color: rgba(0, 0, 0, 0.4);
}

body {
    font-family: 'Poppins', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    transition: background-color 0.5s, color 0.5s;
}

.container {
    text-align: center;
    background-color: var(--container-bg);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--shadow-color);
    transition: background-color 0.5s, box-shadow 0.5s;
}

h1 {
    font-weight: 700;
    font-size: 2.5em;
    margin-bottom: 30px;
}

h1 i {
    color: var(--icon-color);
    margin-right: 15px;
}


.game-row {
    display: flex;
    justify-content: center;
    margin-bottom: 15px;
}

.numbers-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    margin-bottom: 30px;
}

.number-slot {
    width: 65px;
    height: 90px;
    border: 1px solid var(--border-color);
    margin: 0 8px;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 15px;
    background-color: var(--number-bg);
    transition: all 0.3s ease;
}

.number {
    font-size: 38px;
    font-weight: 600;
    color: var(--number-text-color);
    transition: transform 0.2s ease-out, opacity 0.2s;
}

.number.spinning {
    transform: translateY(calc(var(--random, 0) * -1px)) scale(0.9);
    opacity: 0.5;
}


#generate-btn {
    padding: 15px 30px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    border-radius: 10px;
    background: var(--button-bg);
    color: var(--button-text);
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

#generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.25);
}

#generate-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

#generate-btn i {
    margin-right: 10px;
}


/* Theme Switch */
.theme-switch-container {
    position: absolute;
    top: 30px;
    right: 30px;
}

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

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

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

.slider .sun, .slider .moon {
    position: absolute;
    height: 20px;
    width: 20px;
    transition: .4s;
    color: #f0f0f0;
}
.slider .sun {
    left: 7px;
    opacity: 1;
}
.slider .moon {
    right: 7px;
    opacity: 0;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
    z-index: 1;
}

input:checked + .slider {
    background: linear-gradient(135deg, #4c66ee, #2196F3);
}

input:checked + .slider .sun {
    opacity: 0;
}
input:checked + .slider .moon {
    opacity: 1;
}

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