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

body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

/* start container */
.start-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
    padding: 20px;
}

/* animated background shapes */
.bg-shapes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
    z-index: 0;
}

.shape {
    position: absolute;
    font-size: 3rem;
    opacity: 0.15;
    animation: float 8s ease-in-out infinite;
}

.shape-1 { top: 10%; left: 10%; animation-delay: 0s; }
.shape-2 { top: 20%; right: 15%; animation-delay: 1s; }
.shape-3 { bottom: 30%; left: 8%; animation-delay: 2s; }
.shape-4 { bottom: 15%; right: 10%; animation-delay: 3s; }
.shape-5 { top: 50%; left: 5%; animation-delay: 4s; }
.shape-6 { top: 60%; right: 5%; animation-delay: 5s; }

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-30px) rotate(10deg);
    }
}

/* content wrapper */
.content-wrapper {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 0;
}

/* hero section */
.hero-section {
    margin-bottom: 20px;
    animation: fadeInDown 0.8s ease-out;
}

.hero-image {
    max-width: 400px;
    width: 100%;
    height: auto;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.3));
    animation: heroFloat 4s ease-in-out infinite;
}

@keyframes heroFloat {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-15px);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* title section */
.title-section {
    text-align: center;
    margin-bottom: 30px;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.main-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 15px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
}

.main-title span {
    display: inline-block;
    text-shadow: 3px 3px 6px rgba(11, 11, 14, 0.3);
}

.title-rock {
    color: #667eea;
    animation: titleBounce 2s ease-in-out infinite;
}

.title-paper {
    color: #11998e;
    animation: titleBounce 2s ease-in-out infinite 0.3s;
}

.title-scissors {
    color: #f7971e;
    animation: titleBounce 2s ease-in-out infinite 0.6s;
}

@keyframes titleBounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.tagline {
    font-size: 1.3rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 400;
    letter-spacing: 1px;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* preview section */
.preview-section {
    margin-bottom: 30px;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.preview-cards {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

.preview-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 25px 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    min-width: 120px;
}

.preview-card:hover {
    transform: translateY(-10px) scale(1.05);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.rock-card {
    border-bottom: 4px solid #667eea;
}

.paper-card {
    border-bottom: 4px solid #11998e;
}

.scissors-card {
    border-bottom: 4px solid #f7971e;
}

.card-icon {
    font-size: 3rem;
}

.card-name {
    font-size: 1.1rem;
    font-weight: 700;
    color: #444;
}

.card-beats {
    font-size: 0.85rem;
    color: #888;
    font-weight: 500;
}

/*features section */
.features-section {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 40px;
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.2);
    padding: 12px 20px;
    border-radius: 30px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.feature-item:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.05);
}

.feature-icon {
    font-size: 1.5rem;
}

.feature-text {
    color: white;
    font-weight: 600;
    font-size: 0.95rem;
}

.cta-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    animation: fadeInUp 0.8s ease-out 0.8s both;
}

.start-btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 15px;
    padding: 20px 50px;
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    border-radius: 50px;
    text-decoration: none;
    color: white;
    font-size: 1.4rem;
    font-weight: 700;
    box-shadow: 0 10px 30px rgba(17, 153, 142, 0.4);
    transition: all 0.3s ease;
    overflow: hidden;
}

.start-btn:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 20px 40px rgba(17, 153, 142, 0.5);
}

.start-btn:active {
    transform: translateY(-2px);
}

.btn-glow {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
    animation: btnGlow 2s infinite;
}

@keyframes btnGlow {
    0% {
        left: -100%;
    }
    100% {
        left: 100%;
    }
}

.btn-text {
    position: relative;
    z-index: 1;
}

.btn-arrow {
    position: relative;
    z-index: 1;
    font-size: 1.6rem;
    transition: transform 0.3s ease;
}

.start-btn:hover .btn-arrow {
    transform: translateX(5px);
}

.cta-hint {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1rem;
    font-weight: 500;
}

.start-footer {
    margin-top: auto;
    text-align: center;
    padding: 20px;
    animation: fadeIn 1s ease-out 1s both;
}

.start-footer p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

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

@media (max-width: 768px) {
    .hero-image {
        max-width: 280px;
    }

    .main-title {
        font-size: 2.2rem;
        gap: 10px;
    }

    .tagline {
        font-size: 1rem;
    }

    .preview-cards {
        gap: 15px;
    }

    .preview-card {
        padding: 20px 25px;
        min-width: 100px;
    }

    .card-icon {
        font-size: 2.5rem;
    }

    .features-section {
        gap: 15px;
    }

    .feature-item {
        padding: 10px 15px;
    }

    .feature-text {
        font-size: 0.85rem;
    }

    .start-btn {
        padding: 18px 40px;
        font-size: 1.2rem;
    }

    .shape {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .start-container {
        padding: 15px;
    }

    .hero-image {
        max-width: 220px;
    }

    .main-title {
        font-size: 1.8rem;
        flex-direction: column;
        gap: 5px;
    }

    .tagline {
        font-size: 0.9rem;
    }

    .preview-cards {
        flex-direction: column;
        align-items: center;
    }

    .preview-card {
        width: 100%;
        max-width: 200px;
        flex-direction: row;
        justify-content: space-between;
        padding: 15px 20px;
    }

    .card-icon {
        font-size: 2rem;
    }

    .card-name {
        font-size: 1rem;
    }

    .card-beats {
        font-size: 0.8rem;
    }

    .features-section {
        flex-direction: column;
        align-items: center;
    }

    .feature-item {
        width: 100%;
        max-width: 200px;
        justify-content: center;
    }

    .start-btn {
        padding: 16px 35px;
        font-size: 1.1rem;
    }

    .cta-hint {
        font-size: 0.85rem;
    }
}