/* Common Styles - Base styling for all screens */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

html {
    overflow: hidden;
    position: fixed;
    width: 100%;
    height: 100%;
    touch-action: none;
    overscroll-behavior: none;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Noto Sans CJK JP', 'Hiragino Sans', 'Yu Gothic', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    height: 100vh;
    overflow: hidden;
    margin: 0;
    padding: 0;
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    touch-action: none;
    -webkit-overflow-scrolling: none;
    overscroll-behavior: none;
}

.container {
    background: #fff;
    width: 100%;
    height: 100vh;
    max-width: 600px;
    margin: 0 auto;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.hidden {
    display: none !important;
}

/* Button Styles */
.btn {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 1em;
    font-weight: bold;
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
}

.btn:active {
    transform: scale(0.98);
}

.btn.primary {
    background: linear-gradient(135deg, #28a745, #20c997);
}

.btn.secondary {
    background: linear-gradient(135deg, #6c757d, #868e96);
}

.btn.danger {
    background: linear-gradient(135deg, #dc3545, #ff6b6b);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Loading Spinner */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.spinner {
    border: 4px solid rgba(255,255,255,0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Fade animations */
.fade-in {
    animation: fadeIn 0.5s ease;
}

.fade-out {
    animation: fadeOut 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

/* Slide animations */
.slide-in {
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}