:root {
    --wnrs-red: #C31E24;
    --wnrs-white: #FFFFFF;
    --wnrs-black: #1A1A1A;
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    --font-main: 'Inter', 'Helvetica Neue', sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-main);
    background-color: #F5F5F5;
    color: var(--wnrs-black);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.app-container {
    width: 100%;
    max-width: 480px;
    height: 100%;
    background-color: #F5F5F5;
    display: flex;
    flex-direction: column;
    position: relative;
}

header {
    padding: 20px;
    text-align: center;
    z-index: 10;
}

.level-indicator {
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--wnrs-red);
}

main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    perspective: 1000px;
}

.card-container {
    width: 100%;
    max-width: 340px;
    aspect-ratio: 3/4;
    position: relative;
    cursor: pointer;
}

.card {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.4, 0.0, 0.2, 1);
}

.card.flipped {
    transform: rotateY(180deg);
}

.card-inner {
    position: absolute;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
}

.card-front, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 20px;
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 30px;
    text-align: center;
}

.card-front {
    background-color: var(--wnrs-red);
    color: var(--wnrs-white);
}

.card-back {
    background-color: var(--wnrs-white);
    color: var(--wnrs-red);
    transform: rotateY(180deg);
    justify-content: space-between;
    border: 2px solid var(--wnrs-red);
}

.logo {
    font-size: 4rem;
    font-weight: 700;
    letter-spacing: -2px;
}

.tap-hint {
    margin-top: 20px;
    font-size: 0.8rem;
    opacity: 0.8;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.card-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
}

#card-text {
    font-size: 1.8rem;
    font-weight: 700;
    line-height: 1.4;
}

.wildcard-badge {
    margin-top: 20px;
    background-color: var(--wnrs-red);
    color: var(--wnrs-white);
    padding: 5px 10px;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.card-footer {
    width: 100%;
    text-align: center;
    border-top: 1px solid rgba(195, 30, 36, 0.1);
    padding-top: 15px;
}

.wnrs-small {
    font-size: 0.6rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--wnrs-red);
}

footer {
    padding: 20px 20px 40px;
    z-index: 10;
}

.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: var(--font-main);
    font-weight: 600;
    transition: opacity 0.2s;
}

button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.nav-btn {
    color: #999;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.action-btn {
    background-color: var(--wnrs-black);
    color: var(--wnrs-white);
    padding: 12px 24px;
    border-radius: 30px;
    font-size: 1rem;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

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