:root {
    --color-bg: #faf8f5;
    --color-paper: #ffffff;
    --color-text: #2a2a2a;
    --color-text-light: #6b6b6b;
    --color-accent: #ff6b6b;
    --color-accent-hover: #ff5252;
    --color-border: #e8e3db;
    --color-shadow: rgba(0, 0, 0, 0.08);

    --font-display: 'Baloo 2', cursive;
    --font-body: 'DM Sans', sans-serif;

    --radius: 16px;
    --radius-sm: 8px;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0.5rem 1.5rem;
    width: 100%;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 0.75rem;
    animation: fadeSlideDown 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.header-image {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
}

/* Comic Container */
.comic-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 2rem;
    animation: fadeScale 0.8s cubic-bezier(0.34, 1.56, 0.64, 1) 0.2s backwards;
}

.comic-wrapper {
    background: var(--color-paper);
    border-radius: var(--radius);
    padding: 1.25rem;
    box-shadow:
        0 4px 6px var(--color-shadow),
        0 1px 3px rgba(0, 0, 0, 0.04);
    border: 2px solid var(--color-border);
    position: relative;
    max-width: 100%;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.comic-wrapper:hover {
    transform: translateY(-2px);
    box-shadow:
        0 8px 12px var(--color-shadow),
        0 2px 6px rgba(0, 0, 0, 0.04);
}

.comic-image {
    display: block;
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    transition: opacity 0.3s ease;
}

.comic-image.loading {
    opacity: 0.5;
}

/* Navigation */
.navigation {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    animation: fadeSlideUp 0.8s cubic-bezier(0.34, 1.56, 0.64, 1) 0.3s backwards;
}

.nav-btn {
    background: var(--color-paper);
    border: 2px solid var(--color-border);
    color: var(--color-text);
    padding: 0.75rem 1.25rem;
    border-radius: 25px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px var(--color-shadow);
    position: relative;
    overflow: hidden;
}

.nav-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: var(--color-accent);
    transform: translate(-50%, -50%);
    transition: width 0.4s ease, height 0.4s ease;
    z-index: -1;
}

.nav-btn:hover::before {
    width: 300px;
    height: 300px;
}

.nav-btn:hover {
    color: white;
    border-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(255, 107, 107, 0.3);
}

.nav-btn:active {
    transform: translateY(0);
}

.nav-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
}

.nav-btn:disabled:hover {
    color: var(--color-text);
    border-color: var(--color-border);
    box-shadow: 0 2px 4px var(--color-shadow);
}

.nav-btn:disabled::before {
    display: none;
}

.nav-btn-random {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
    font-weight: 600;
}

.nav-btn-random::before {
    background: var(--color-accent-hover);
    z-index: -1;
}

.nav-btn-random:hover {
    background: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    color: white;
}

/* Footer */
.footer {
    text-align: center;
    padding-top: 1rem;
    border-top: 2px solid var(--color-border);
    animation: fadeIn 1s ease 0.5s backwards;
}

.footer-text {
    color: var(--color-text-light);
    font-size: 0.9rem;
}

/* Animations */
@keyframes fadeSlideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes fadeScale {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

/* Responsive */
@media (max-width: 640px) {
    .container {
        padding: 1.5rem 1rem;
    }

    .comic-wrapper {
        padding: 1.25rem;
    }

    .navigation {
        gap: 0.5rem;
    }

    .nav-btn {
        padding: 0.65rem 1rem;
        font-size: 0.9rem;
    }

    .nav-btn-text {
        font-size: 0.85rem;
    }

    .nav-btn-random {
        order: 1;
        width: 100%;
        max-width: max-content;
        margin-left: auto;
        margin-right: auto;
    }
}