:root {
    --fr-blue: #0055A4;
    --fr-white: #FFFFFF;
    --fr-red: #EF4135;
    --dark-bg: #222;
    --slot-bg: #f9f9f9;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--dark-bg);
    color: var(--fr-white);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

header {
    text-align: center;
    padding: 2rem 0;
    width: 100%;
    background: linear-gradient(90deg, var(--fr-blue) 0%, var(--fr-blue) 33.33%, var(--fr-white) 33.33%, var(--fr-white) 66.66%, var(--fr-red) 66.66%, var(--fr-red) 100%);
    color: #333;
    text-shadow: 1px 1px 2px rgba(255,255,255,0.8);
}

header h1 {
    margin: 0;
    font-size: 3rem;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 2px;
}

header p {
    font-size: 1.2rem;
    margin-top: 0.5rem;
    font-weight: bold;
}

.nav-btn {
    display: inline-block;
    color: var(--fr-white);
    background-color: #333;
    text-decoration: none;
    font-weight: bold;
    padding: 10px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
    transition: all 0.2s;
    font-size: 1.1rem;
    border: 2px solid var(--fr-white);
}

.nav-btn:hover {
    background-color: #555;
    transform: translateY(-2px);
    box-shadow: 0 6px 8px rgba(0,0,0,0.4);
}

main {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex-grow: 1;
    width: 100%;
    max-width: 800px;
    padding: 2rem;
}

.machine-container {
    background: linear-gradient(to bottom, #d3d3d3, #a9a9a9);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5), inset 0 2px 5px rgba(255,255,255,0.5);
    border: 5px solid #888;
    width: 100%;
    box-sizing: border-box;
}

.slot-machine {
    display: flex;
    justify-content: space-between;
    gap: 15px;
    background-color: #111;
    padding: 20px;
    border-radius: 10px;
    box-shadow: inset 0 5px 15px rgba(0,0,0,0.8);
    margin-bottom: 2rem;
}

.slot {
    flex: 1;
    height: 120px;
    background-color: var(--slot-bg);
    border: 3px solid #555;
    border-radius: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
    box-shadow: inset 0 2px 10px rgba(0,0,0,0.2);
}

/* Individual slot colors */
#slot-verb {
    border-color: var(--fr-blue);
    border-width: 4px;
}
#slot-person {
    border-color: #888;
    border-width: 4px;
}
#slot-tense {
    border-color: var(--fr-red);
    border-width: 4px;
}

.slot-text {
    font-size: 1.5rem;
    font-weight: bold;
    color: #333;
    text-align: center;
    padding: 0 10px;
    text-shadow: 1px 1px 0px rgba(255,255,255,0.8);
}

.blur {
    filter: blur(2px);
    opacity: 0.7;
    transform: translateY(10px);
    transition: all 0.1s;
}

.controls {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.btn {
    padding: 15px 40px;
    font-size: 1.5rem;
    font-weight: bold;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    text-transform: uppercase;
    transition: all 0.2s;
    box-shadow: 0 5px 0 #555, 0 10px 10px rgba(0,0,0,0.3);
}

.btn:active {
    transform: translateY(5px);
    box-shadow: 0 0 0 #555, 0 5px 5px rgba(0,0,0,0.3);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: translateY(5px);
    box-shadow: 0 0 0 #555;
}

#btn-start {
    background-color: #4CAF50;
    color: white;
}

#btn-stop {
    background-color: var(--fr-red);
    color: white;
}

/* Animations for slots */
@keyframes scrollDown {
    0% { transform: translateY(-100%); }
    100% { transform: translateY(100%); }
}

.spinning {
    animation: scrollDown 0.2s linear infinite;
}