/*  START PAGE  */
.start-page {
    text-align: center;
    padding-top: 12vh;
}

.start-page h1 {
    font-size: 2.8rem;
    margin-bottom: 8px;
    animation: titleGlow 3s ease-in-out infinite;
}

@keyframes titleGlow {
    0%, 100% {
        text-shadow: 0 0 20px var(--accent-glow), 0 0 60px rgba(0, 212, 255, 0.15);
    }
    50% {
        text-shadow: 0 0 30px var(--accent-glow), 0 0 80px rgba(0, 212, 255, 0.25), 0 0 120px rgba(0, 212, 255, 0.1);
    }
}

.start-page .subtitle {
    font-family: var(--font-arcade);
    font-size: 1rem;
    color: var(--purple);
    letter-spacing: 2px;
    margin-bottom: var(--space-2xl);
    text-shadow: 0 0 8px rgba(168, 85, 247, 0.3);
}

.start-page .description {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: var(--space-2xl);
    max-width: 440px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

/* Decorative pixel border on start */
.start-page .pixel-border {
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), var(--purple));
    border-radius: 2px;
    margin: 0 auto 24px;
    box-shadow: var(--shadow-glow);
    animation: pixelBorderPulse 2s ease-in-out infinite;
}

@keyframes pixelBorderPulse {
    0%, 100% { box-shadow: 0 0 8px var(--accent-glow); width: 60px; }
    50% { box-shadow: 0 0 16px var(--accent-glow); width: 80px; }
}

/*  START CHARACTERS - Road scene  */
.start-characters {
    margin: 0 auto var(--space-2xl);
    max-width: 420px;
}

.start-characters__road {
    position: relative;
    height: 90px;
    display: flex;
    align-items: center;
}

.start-characters__line {
    position: absolute;
    top: 50%;
    left: 10%;
    right: 10%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--text-dim) 60%, var(--purple));
    border-radius: 2px;
    transform: translateY(-50%);
    box-shadow: 0 0 6px rgba(0, 212, 255, 0.15);
}

.start-characters__line::before {
    content: '';
    position: absolute;
    top: -4px;
    left: 0;
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    box-shadow: 0 0 12px var(--accent-glow);
    animation: dotPulseStart 2s ease-in-out infinite;
}

.start-characters__line::after {
    content: '';
    position: absolute;
    top: -4px;
    right: 0;
    width: 8px;
    height: 8px;
    background: var(--purple);
    border-radius: 50%;
    box-shadow: 0 0 12px rgba(168, 85, 247, 0.5);
    animation: dotPulseStart 2s ease-in-out 1s infinite;
}

.start-characters__group {
    position: absolute;
    left: 6%;
    display: flex;
    gap: var(--space-xs);
    z-index: 2;
}

.start-characters__sprite {
    width: 48px;
    height: 48px;
    image-rendering: pixelated;
    border-radius: var(--radius-sm);
    border: 2px solid var(--border);
    background: var(--bg-deep);
    filter: drop-shadow(0 0 6px var(--accent-glow));
    transition: transform var(--duration-normal) ease, box-shadow var(--duration-normal) ease;
}

.start-characters__sprite:hover {
    transform: translateY(-2px) !important;
    box-shadow: var(--shadow-glow);
}

.start-characters__sprite--1 { animation: startIdle 2.5s ease-in-out infinite; }
.start-characters__sprite--2 { animation: startIdle 2.5s ease-in-out 0.3s infinite; }
.start-characters__sprite--3 { animation: startIdle 2.5s ease-in-out 0.6s infinite; }
.start-characters__sprite--4 { animation: startIdle 2.5s ease-in-out 0.9s infinite; }

@keyframes startIdle {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-5px); }
}

.start-characters__dest {
    position: absolute;
    right: 6%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    z-index: 2;
}

.start-characters__train {
    width: 40px;
    height: 40px;
    image-rendering: pixelated;
    filter: drop-shadow(0 0 8px rgba(168, 85, 247, 0.5));
    animation: trainBob 3s ease-in-out infinite;
}

.start-characters__dest-label {
    font-family: var(--font-arcade);
    font-size: 0.75rem;
    color: var(--purple);
    letter-spacing: 2px;
    text-shadow: 0 0 6px rgba(168, 85, 247, 0.3);
}

@keyframes trainBob {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-3px); }
}

@keyframes dotPulseStart {
    0%, 100% { box-shadow: 0 0 6px var(--accent-glow); opacity: 0.7; }
    50%      { box-shadow: 0 0 16px var(--accent-glow); opacity: 1; }
}

/*  FORM  */
.start-form {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
    max-width: 360px;
    margin: 0 auto;
}

.start-form button[type="submit"] {
    font-family: var(--font-arcade);
    font-size: 1.3rem;
    background: var(--accent);
    color: var(--bg-deep);
    border: none;
    padding: 14px 40px;
    border-radius: var(--radius);
    cursor: pointer;
    letter-spacing: 2px;
    transition: all var(--duration-normal) ease;
    text-decoration: none;
    display: inline-block;
    font-weight: 400;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-glow);
    animation: launchBtnPulse 2s ease-in-out infinite;
}

@keyframes launchBtnPulse {
    0%, 100% { box-shadow: 0 0 16px var(--accent-dim); }
    50% { box-shadow: 0 0 28px var(--accent-glow), 0 0 48px rgba(0, 212, 255, 0.15); }
}

.start-form button[type="submit"]:hover {
    background: #00b8d4;
    box-shadow: var(--shadow-glow), 0 0 32px var(--accent-glow), 0 0 56px rgba(0, 212, 255, 0.2);
    transform: translateY(-2px);
    animation: none;
}

.start-form button[type="submit"]:active {
    transform: translateY(1px) scale(0.98);
    box-shadow: 0 0 12px var(--accent-dim);
    transition: all var(--duration-fast) ease;
}

/*  GAME MODE SELECTOR  */
.mode-selector {
    display: flex;
    gap: var(--space-md);
    width: 100%;
}

.mode-option {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-panel);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--duration-normal) ease;
}

.mode-option input[type="radio"] {
    display: none;
}

.mode-option:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-glow);
}

.mode-option--active {
    border-color: var(--accent);
    background: rgba(0, 212, 255, 0.08);
    box-shadow: var(--shadow-glow), inset 0 0 12px var(--accent-dim);
}

.mode-option__name {
    font-family: var(--font-arcade);
    font-size: 1rem;
    color: var(--text);
    letter-spacing: 1px;
}

.mode-option--active .mode-option__name {
    color: var(--accent);
    text-shadow: 0 0 8px var(--accent-glow);
}

.mode-option__desc {
    font-size: 0.72rem;
    color: var(--text-dim);
    text-align: center;
}

.mode-option--disabled {
    opacity: 0.35;
    cursor: not-allowed;
    pointer-events: none;
    filter: grayscale(0.5);
}

.start-leaderboard-link {
    display: inline-block;
    margin-top: var(--space-xl);
    font-family: var(--font-arcade);
    font-size: 0.85rem;
    color: var(--text-muted);
    text-decoration: none;
    letter-spacing: 1px;
    transition: color var(--duration-normal) ease;
}

.start-leaderboard-link:hover {
    color: var(--accent);
    text-shadow: 0 0 8px var(--accent-glow);
}

/*  RESPONSIVE START  */
@media (max-width: 600px) {
    .start-page h1 {
        font-size: 2rem;
    }

    .start-page {
        padding-top: 6vh;
    }

    .start-form {
        padding: 0 var(--space-sm);
    }

    .start-characters__sprite {
        width: 36px;
        height: 36px;
    }

    .start-characters__train {
        width: 32px;
        height: 32px;
    }

    .start-characters__road {
        height: 70px;
    }
}