:root {
    --bg-color: #ffffff;
    --text-primary: #000000;
    --text-secondary: #555555;
    --button-bg: #f8f9fa;
    --button-hover-bg: #f1f3f5;
    --shadow-soft: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.1);
    --transition-speed: 0.3s;
    --border-radius: 16px;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-family);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 40px 20px;
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 450px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

/* Header */
.header {
    margin-bottom: 32px;
    animation: fadeInDown 0.8s ease-out;
}

.logo {
    width: 80px;
    height: auto;
    margin-bottom: 24px;
}

.title {
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 8px;
    padding: 0 20px;
}

/* Links Section */
.links-container {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 40px;
}

.link-button {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--button-bg);
    padding: 18px 24px;
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.1rem;
    box-shadow: var(--shadow-soft);
    transition: all var(--transition-speed) cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(0, 0, 0, 0.03);
    opacity: 0;
    transform: translateY(20px);
}

.link-button.visible {
    opacity: 1;
    transform: translateY(0);
}

.link-button:hover {
    background-color: var(--button-hover-bg);
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.link-button:active {
    transform: translateY(0);
}

.link-content {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

.link-icon-dots {
    color: #999;
    font-size: 1.2rem;
}

/* Footer */
.footer {
    display: flex;
    gap: 24px;
    margin-top: auto;
    padding-bottom: 20px;
}

.social-icon {
    color: var(--text-primary);
    text-decoration: none;
    transition: transform 0.2s ease;
}

.social-icon:hover {
    transform: scale(1.15);
}

.social-icon svg {
    width: 32px;
    height: 32px;
    fill: currentColor;
}

/* About Us Section */
.about-us {
    background-color: #f9f9f9;
    padding: 36px 28px;
    border-radius: var(--border-radius);
    width: 100%;
    margin-bottom: 48px;
    position: relative;
    text-align: left;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
    border: 1px solid rgba(0, 0, 0, 0.03);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.8s ease-out;
}

.about-us.visible {
    opacity: 1;
    transform: translateY(0);
}

.quote-icon {
    width: 38px;
    height: auto;
    margin-bottom: 20px;
    color: #cccccc;
}

.about-us p {
    font-size: 1rem;
    color: #444;
    font-style: italic;
    margin-bottom: 18px;
    line-height: 1.8;
    letter-spacing: 0.2px;
}

.about-us p:last-child {
    margin-bottom: 0;
}

.about-us strong {
    color: var(--text-primary);
    font-weight: 700;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

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

/* Attribution Footer */
.attribution {
    margin-top: 48px;
    padding: 24px 0;
    text-align: center;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    width: 100%;
}

.attribution p {
    font-size: 0.75rem;
    color: #888;
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.developer-link {
    text-decoration: none;
    color: var(--text-primary);
    transition: opacity 0.2s ease;
}

.developer-link:hover {
    opacity: 0.7;
}

.developer-tag {
    font-size: 0.7rem;
    font-weight: 400;
    margin-bottom: 2px;
}

.developer-name {
    font-size: 1.1rem;
    font-weight: 800;
    letter-spacing: 2px;
}